(19)
(11)EP 1 416 627 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
12.04.2017 Bulletin 2017/15

(21)Application number: 03009837.0

(22)Date of filing:  13.05.2003
(51)Int. Cl.: 
H02P 1/46  (2006.01)
F02N 11/04  (2006.01)

(54)

Control method of an electric rotating machine for a vehicle

Steuerungsmethode einer rotierenden elektrischen Maschine in einem Fahrzeug

Méthode de côntrole d'une machine électrique tournante pour un véhicule


(84)Designated Contracting States:
DE FR GB

(30)Priority: 24.10.2002 JP 2002310023

(43)Date of publication of application:
06.05.2004 Bulletin 2004/19

(73)Proprietor: MITSUBISHI DENKI KABUSHIKI KAISHA
Chiyoda-ku Tokyo 100-8310 (JP)

(72)Inventors:
  • Inoue, Masaya
    Tokyo 100-8310 (JP)
  • Kometani, Haruyuki
    Tokyo 100-8310 (JP)
  • Yoshizawa, Toshiyuki
    Tokyo 100-8310 (JP)
  • Fujita, Masahiko
    Tokyo 100-8310 (JP)
  • Yamamoto, Tsunenobu
    Tokyo 100-8310 (JP)
  • Asao, Yoshihito
    Tokyo 100-8310 (JP)
  • Nishimura, Shinji
    Tokyo 100-8310 (JP)

(74)Representative: Hoffmann Eitle 
Patent- und Rechtsanwälte PartmbB Arabellastraße 30
81925 München
81925 München (DE)


(56)References cited: : 
EP-A2- 0 817 367
US-A1- 2002 074 803
US-A- 6 118 247
US-B1- 6 335 609
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    Background of the Invention


    1. Field of the Invention



    [0001] The present invention relates to a control method of an electric rotating machine for vehicle installed in an internal combustion engine for vehicle and used as a generator and a motor.

    2. Description of the Related Art



    [0002] Hitherto, it has been proposed that a three-phase synchronous rotating machine is mounted on a vehicle and used as a charging generator in driving the vehicle as well as a starting motor in starting the internal combustion engine. Vehicles adopting idle stop, i.e., a function of stopping the internal combustion engine during stopping the vehicle in order to reduce exhaust gas, have been available recent years. In these vehicles, especially when the vehicle is stopping on the red light, it is necessary to complete restart of the internal combustion engine so that the vehicle is ready to start immediately upon receipt of a command to restart the internal combustion engine on the green light.

    [0003] However, in a case where the electric rotating machine is used both as a charging generator and as a starter motor, a field winding of an electric rotating machine requires a large time constant as described later in order to satisfy the function as the charging generator. As a result, when such an electric rotating machine is used to perform a function as a motor, rise time of the field current is used to be long and it takes a long time to restart the internal combustion engine, and the vehicle cannot start smoothly. Means for solving such a problem is disclosed in such literatures as Patent Document 1 (the Japanese Patent Publication (unexamined) No. 2002-19158, page 4, Fig. 4) and Patent Document 2 (the Japanese Patent Publication (unexamined) No. 313498/1999 pages 3 to 7, Figs. 7 and 8).

    [0004] Patent Document 1 discloses an art in which when an internal combustion engine is started by a synchronous generator motor having a field winding and an armature winding, a power converter supplies the armature winding with an armature current having a current component that forms magnetic flux in the same direction as field flux generated by the field winding. Patent Document 2 discloses an art related to a synchronous motor for a hybrid car, in which delay in rising torque due to delay in rising field current is compensated by the steps of: detecting that the synchronous motor is in a transient state, i.e., the synchronous motor is not rotating at a constant speed during driving the synchronous motor; obtaining a current component for getting a magnetic flux whose component is coaxial with field flux on the basis of an output demand value; and controlling the armature current based on the obtained current component.

    [0005] In the foregoing conventional arts, particularly in Patent Document 1, an electric current is applied to the armature (a stator) so as to generate magnetic flux in the same direction as the field flux (rotator flux). As a result, the iron core forming a magnetic circuit of a magnetic field is saturated, and self-inductance of the field winding is reduced. The time constant is decreased and the rise time of the field current is shortened, and responsiveness of the synchronous motor is improved. However, the synchronous machine controlled as described above still has problems as described below.

    [0006] When electric supply is abruptly started so that magnetic flux is generated in the same direction as the field flux in the armature, an induced electromotive force is generated in the field winding in the direction to cancel the magnetic flux. Generally a control circuit for controlling the field current is provided with a semiconductor control device (numeral 301) as shown in Fig. 3 of Patent Document 1. The mentioned induced electromotive force is an electromotive force in a direction opposite to the current that is originally applied to the field winding. As the electromotive force reaches a relatively high voltage, it is necessary to increase withstand voltage of the semiconductor control element more than required. Moreover, in a case where a two-way device capable of applying a current bidirectionally is used as the semiconductor control element in order to control the counter electromotive force, a current flows in a direction opposite to the original field current. This brings about a bias resulting in delay of the rise time of the field flux.

    [0007] To meet these problems, it may be an idea to start up the field current after the current applied to the armature has reached a predetermined value. In this case, however, the time for applying a power to the armature becomes longer. Hence a problem exists in that temperature rise occurs in the control circuit that controls the armature winding and application of current to the armature winding. Moreover, a synchronous machine for starting the internal combustion engine has been used. In this synchronous machine, field winding and permanent magnet are used together and a part of the magnetic flux of the permanent magnet is generated in a direction opposite to the main magnetic flux generated by the field winding in order to restrain magnetic saturation and leakage flux of the field winding. In the case of applying the mentioned conventional art to such a synchronous machine, it is essential to increase the current applied to the armature in order to saturate the magnetic circuit of the magnetic field. Since total sum of the field magnetomotive force is large particularly in the Randell-type multi-polar synchronous rotating machine, the temperature rise in the armature winding and the current control circuit is increased all the more.

    [0008] Background art of interest is also disclosed in the following documents.

    [0009] US 2002/0074803 A1 discloses a vehicle motor-generator apparatus based on a field winding type of synchronous machine coupled to a power inverter and a battery, wherein the synchronous machine is controlled to operate as a motor to perform engine starting and thereafter be driven by the engine as an electrical generator, wherein during a short time interval at the commencement of engine starting, the armature winding of the synchronous machine is driven by a current such that magnetic flux is produced by the armature winding acting in the same direction as magnetic flux produced by the field winding, to thereby achieve increased torque during the time when maximum torque is required. In addition, the supplied field current is set at a maximum value during only an initial period when engine starting begins, until the first compression stroke of the engine has been completed, and thereafter set to a reduced value until the completion of engine starting, thereby reducing the amount temperature rise within the field winding during engine starting, while ensuring a sufficiently high value of initial torque.

    [0010] US 6,335,609 B1 discloses a method for reducing the starting time and reducing the peak phase currents for an internal combustion engine that is started using an induction machine starter/alternator. The starting time is reduced by pre-fluxing the induction machine and the peak phase currents are reduced by reducing the flux current command after a predetermined period of time has elapsed and concurrent to the application of the torque current command. The method also provides a strategy for anticipating the start command for an internal combustion engine and determines a start strategy based on the start command and the operating state of the internal combustion engine.

    [0011] US 6,118,247 discloses that a drive control apparatus for an electric synchronous machine is composed of armature current control means and transient operation detection means. When the synchronous machine is intended to increase power in a transient operation, the current control means supplies the armature winding with compensation current to cancel counter-electromotive force formed when field current is supplied to the field winding through a mutual inductance of the field winding and the armature winding.

    [0012] EP 0 817 367 A2 discloses a generator system for internal combustion engines, which can produce power efficiently at all times irrespective of the engine speed even for use in an internal combustion engine operated at variable speeds such as a vehicle engine. An ACG.ECU determines a rotation speed N2 of a rotating electromagnetic field to be generated by a rotor based on a mechanical rotation speed N1 of the rotor in an alternator such that the relative speed N of the rotating magnetic field to a stator agrees with the maximum efficiency speed of rotation Nx. Then the ACG.ECU sends the determined value to a rotating electromagnetic field controller. The rotating electromagnetic field controller controls phases of AC power to be supplied to a three-phase coil of the rotor to generate a rotating electromagnetic field with the rotation speed N2.

    Summary of the Invention



    [0013] The present invention was made to solve the above-discussed problems and has an object of obtaining a control method of an electric rotating machine for vehicle in which field flux rises speedily and startup time of the internal combustion engine is shortened without inviting any overvoltage of the control element and any sharp temperature rise in the armature winding as well as in the current control circuit.

    [0014] The present invention provides a control method of an electric rotating machine for a vehicle as set out in each of appended Claims 1 and 4. Optional features are set out in the remaining claims.

    Brief Description of the Drawings



    [0015] 

    Fig. 1 is a schematic diagram for explaining an arrangement of a control method of an electric rotating machine for vehicle according to Embodiment 1 of the present invention.

    Fig. 2 is a diagram for explaining the control method of an electric rotating machine for vehicle according to Embodiment 1 of the invention.

    Fig. 3 is an explanatory diagram for explaining advantages obtained by the control method of an electric rotating machine for vehicle according to Embodiment 1 of the invention.

    Fig. 4 is a characteristic diagram for explaining the control method of an electric rotating machine for vehicle according to Embodiment 1 of the invention.

    Fig. 5 is a characteristic diagram for explaining the control method of an electric rotating machine for vehicle according to Embodiment 1 of the invention.

    Fig. 6 is an explanatory diagram for explaining a control method of an electric rotating machine for vehicle according to Embodiment 2 of the invention.

    Fig. 7 is an explanatory diagram for explaining a control method of an electric rotating machine for vehicle according to Embodiment 3 of the invention.


    Description of the Preferred Embodiments



    [0016] A control method is described herein for an electric rotating machine for vehicle including an electric rotating machine comprised of a rotator having a field winding and a stator having an armature winding, field current control means for controlling a field current supplied from a direct-current power source to the field winding, and a power converter for converting a power of the direct-current power source into an alternating-current power and applying the electric power to the armature winding. In this control method, when the field current control means starts to supply a current to the field winding for starting an internal combustion engine, the power converter supplies a power to the armature winding so that a magnetic flux in a direction opposite to a field flux of the field winding is generated simultaneously with or immediately before starting the power supply from the field current control means to the field winding.

    [0017] Another control method is described herein for an electric rotating machine for vehicle including an electric rotating machine comprised of a rotator having a field winding and a stator having an armature winding, field current control means for controlling a field current supplied from a direct-current power source to the field winding, and a power converter comprised of a three-phase six-arm voltage-fed inverter for converting a power of the direct-current power source into an alternating-current power and applying the electric power to the armature winding. In the mentioned control method, when the field current control means starts to supply a current to the field winding for starting an internal combustion engine, the power supply to the field winding is carried out by conducting all of either upper arms or lower arms of the inverter to bring the armature winding into a short-circuited state.

    [0018] As a result, self-inductance of the field winding is cancelled by mutual inductance of the field winding and the armature winding, and the field current rises swiftly when voltage is applied. It is possible to start speedily the internal combustion engine without inviting any generation of counter voltage and any temperature rise. Furthermore, the same advantages are performed in a synchronous machine in which a permanent magnet is used as a magnetic field together with a field winding.

    [0019] Embodiments of the invention will now be described in detail, with reference to the accompanying drawings.

    Embodiment 1.



    [0020] Fig. 1 is a schematic diagram showing an arrangement of a control method of an electric rotating machine for vehicle according to Embodiment 1 of the invention. Referring to Fig. 1, an electric rotating machine 1 is comprised of an armature core (stator core) 2 having a three-phase armature winding (stator winding) 3 and a Randell-type multipolar rotator core (field core) 4 having a field winding (rotator winding) 5. When the electric rotating machine 1 functions as a motor, the electric rotating machine 1 is supplied with a power from a direct-current power source not shown in the drawing. Further, a power converter 6 functioning as an inverter supplies a three-phase alternating current to the armature winding 3, and the field winding 5 is supplied with a direct current from a field current control means 9 through a slip ring 8 disposed on a rotary shaft 7.

    [0021] When the electric rotating machine 1 functions as a generator, the power converter 6 functions as a converter (rectifying means) and converts the three-phase alternating current generated by the electric rotating machine 1 into a direct current. The power converter 6 charges the direct-current power source not shown with a power, and the field current control means 9 controls an amount of power generation. When the electric rotating machine 1 functions as a motor, the field current control means 9 controls a field current establishing a predetermined direct current at every operating point as a target value. The control method described herein relates to a starting characteristic at the time the electric rotating machine 1 functions as a motor. Now the function as a motor is hereinafter described.

    [0022] The three-phase synchronous motor is defined by projecting it on d-q axes, which are orthogonal coordinates rotating synchronously with a rotator, and its operating state is expressed as being a composite vector of two components on the d-q axes. The description hereinafter will be given using these d-q axes, in which the d-axis indicates the center of a magnetic pole generated in a space between the rotator core 4 and the armature core 2 when the field winding 5 is supplied with a power, and the q-axis indicates a position where the phase is shifted 90° in electrical angle from the d-axis.

    [0023] Fig. 2 shows a relation between the armature (stator) and the magnetic field (rotator) on the d-axis in the form of an equivalent model. In the drawing, a power converter 6a functioning as an inverter, an armature winding 3a, a field winding 5a, and field current control means functioning as a magnetic field power supply are respectively transformed into a d-axis equivalent circuit. In the following description, a plus d-axis current indicates an armature current flowing in a direction so as to generate a magnetic flux in the same
    direction as a magnetic flux generated when the current is applied to the field winding 5a in positive direction. A minus d-axis current indicates the armature current applied in reverse direction.

    [0024] Generally in the electric rotating machine 1 constituted as shown in Fig. 1, multiwinding coil of thin wires is used as the field winding 5 to secure ampere turn for the purpose of reducing a current-carrying capacity of the slip ring 8 or reducing a current-carrying capacity of the field current control means 9. In the electric rotatingmachine 1 constituted as described above, torque is mainly generated by electromagnetic interaction between a q-axis current on the armature side and d-axis magnetic flux on the rotator side. In a case where the electric rotating machine constituted as described above is used to obtain an instantaneous reaction such as restart of the internal combustion engine being in idle stop, time constant of the field winding 5 is large to the extent of approximately 0.3 to 0.5 second. Therefore, rise time of the field flux is long, and it is not possible to immediately generate any torque.

    [0025] To shorten the rise time of the field flux, it is possible to obtain instantaneous reaction by, for example, keeping the field flux raised at all times even when the internal combustion engine is stopped. However, supplying the field winding 5 with a power nearly to the limit at all times invites a considerable temperature rise in the field winding 5 and the field current control means 9. It is also possible to shorten the rise time of the field flux by applying preliminarily the plus d-axis current to the armature winding 3, magnetically saturating the magnetic circuit of the rotator preliminarily, and decreasing magnetic permeability of the rotator core 4 so that inductance of the field winding 5 is equivalently reduced, thus the time constant being small.

    [0026] However, on the supposition of using a general current control circuit in combination of a semiconductor device 10 capable of applying a current only in one direction to the field current control means 9 and a diode 11 for protecting the semiconductor device as shown in Fig. 3, a high counter voltage is applied to both ends of the semiconductor device 10 and the diode 11 by counter electromotive force induced in the field winding 5. It is therefore necessary to increase the withstand voltage of the semiconductor device. Further, supposing that any recovery diode for protecting the semiconductor device is connected in parallel to the semiconductor device 10, the current in the field winding 5 flows in a direction opposite to the original excitation, and a minus bias is added. As a result, even when the semiconductor switch 10 is turned on, any delay occurs in the current in the positive direction.

    [0027] It may be a further idea for shortening the rise time of the field flux to gradually apply preliminarily the plus d-axis current to the armature winding 3 before rise of the field current. In this case, a heavy current is applied to the armature winding 3 for a long time, and temperature rise in the armature winding 3 and the power converter 6 becomes large. To cope with this, in the electric rotating machine for vehicle according to Embodiment 1 of the invention, the following control is carried out.

    [0028] In a case where the voltage applied to both ends of the field winding 5 is represented by Vf and the field current is represented by If, a relation between Vf and If is expressed as follows:

    where: p is a differential operator, Rf is a resistance of the field winding 5, Lf is a self-inductance of the field winding 5, M is a mutual inductance of the armature winding 3 and the field winding 5 on the d-axis, and Id is a current of the armature winding 3 on the d-axis.

    [0029] Referring to the foregoing expression, when Id is controlled so as to be pLfIf = -pMId and the magnetic flux generated by If is cancelled by the magnetic flux generated by Id at all times, then the inductance is cancelled and the time constant is reduced, thus it is possible to control If speedily conforming to Vf.

    [0030] Fig. 4 is a diagram for explaining this operation, and is a time chart showing current control amount of I f and Id. In the drawing, (a) indicates an amount of d-axis magnetic flux in a space or void between the armature and the rotator generated by Id of the armature winding 3, and (b) indicates an amount of d-axis magnetic flux generated by If of the field winding 5. The current value is controlled so as to be pLfIf = -pMId in the drawing. Owing to such current control, it is possible to reduce interlinkage magnetic flux of both field winding 5 and armature winding 3 to a great degree, and it is possible to equivalently cancel the inductance and instantaneously start up the current.

    [0031] In a case where it is necessary to control the current of the armature winding 3 in consideration of the capacity of the power converter 6 and others, the magnetic flux generated by the armature winding 3 and the magnetic flux generated by the field winding 5 are set up in a direction so as to cancel the inductance as described above, thus the magnetic field can rise speedily though halfway as shown in the characteristic chart of Fig. 5. Furthermore, supposing that the magnetic flux are out of conditions for being completely cancelled due to the limit of control speed, applying the minus d-axis current to the armature winding 3 acts as electromagnetic induction in a direction of speedily start up the current of the field winding 5. As a result, it is possible to obtain an advantage of suitably shortening the rise time of the field current of the field winding 5 and shortening the time for starting operation of the electric rotating machine 1 that acts as a starter motor. In addition, it is possible to smoothly start up the field current by establishing that the sum of the magnetic flux generated by the armature winding 3 and the magnetic flux generated by the field winding 5 is substantially constant.

    Embodiment 2.



    [0032] Fig. 6 is a diagram of an essential part for explaining a control method of an electric rotating machine for vehicle according to Embodiment 2 of the invention. The electric rotating machine for vehicle in this embodiment, in which a field winding and a permanent magnet are used together as a magnetic field, intends to shorten the rise time of the field current. In the Randell-type synchronous rotating machine for vehicle having a multipolar structure as described in the foregoing Embodiment 1 referring to Fig. 1, a magnetic circuit is formed in which magnetic flux of every magnetic pole passes through the inner circumferential side of the field winding 5, i.e., the rotary shaft 7. As a result, a magnetic flux amount of the magnetic field is restricted by magnetic saturation of this rotary shaft 7, thereby output limit of the synchronous machine being established.

    [0033] To expand this output limit, for example, as shown in Fig. 6, the field winding 5 and a permanent magnet 12 are disposed together in which magnetomotive force of the field winding 5 and that of the permanent magnet 12 are formed in the same direction. Thus, as shown in the drawing, a magnetic flux Φ1 generated by the permanent magnet 12 and a d-axis magnetic flux Φ2 generated by the field winding 5 are formed in the opposite direction at the central part of the rotary shaft 7, whereby it is possible to relax magnetic saturation at the central part of the rotary shaft 7. Various types of Randell-type synchronous machines in which the permanent magnet 12 and the field winding 5 are used together have been proposed recent years.

    [0034] This constitution shows that it is difficult to saturate the d-axis magnetic circuit of the rotator. Therefore, when it is necessary to saturate the magnetic circuit in order to reduce the inductance and shorten the rise time of the filed current, it is difficult to generate magnetic saturation by applying the plus d-axis current to the armature winding 3. Without applying a heavy current to the armature winding 3, it is difficult to shorten the rise time of the field current with the use of magnetic saturation.

    [0035] However, as described in the foregoing Embodiment 1, by controlling Id so that the magnetic flux generated by the current Id of the armature winding 3 on the d-axis always cancels the magnetic flux generated by the field current If and controlling the direction of the self-inductance Lf of the field winding 5 so that the self-inductance Lf is cancelled by the mutual inductance M on the d-axis of the field winding 5 and the armature winding 3, it is possible to shorten the rise time of the field current regardless of magnetic saturation of the magnetic field. As a result, it is possible to speedily restart the internal combustion engine also in an electric rotating machine in which the field winding 5 and the permanent magnet 12 are disposed together.

    Embodiment 3.



    [0036] The foregoing Embodiment 1 describes about a method of applying a current to the armature winding 3 on the d-axis. In this application of current, it is necessary to control position on the d-axis on the basis of information about position of the rotator. The Randell-type synchronous rotating machine has poles as much as ten to sixteen poles in general. Especially in a case where the machine has a multipolar structure with sixteen poles, a detection error of 1 degree in mechanical angle corresponds to 8 degrees in electrical angle. This invites easily an error in phase-control angle, and it is sometimes difficult to completely cancel the magnetic flux depending on the control structure. To avoid such a situation, an angle detector of high precision of which resolution is not more than 1 degree is required. It is, however, essential to be extremely precise in mounting the angle detector capable of detecting absolute position in order to secure the resolution of not more than 1 degree. Especially in case of mounting a magnetic angle detector at a shaft end of the Randell-type synchronous rotating machine, leakage flux from the field winding 5 gives a great influence on the angle detector, and it is difficult to secure precision of 1 degree in mechanical angle in most case.

    [0037] This embodiment intends to propose a control method of the d-axis current without using any angle detector in such a delicate situation. In this control method, the armature winding 3 is supplied with power from the power converter 6 as shown in Fig. 1. Note that this power converter 6 is a three-phase inverter as show in Fig. 7, in which upper three arms are provided with switching elements 13u to 13w, and lower three arms are provided with switching elements 14u to 14w. When the internal combustion engine is restarted, first a field command based on a start command is issued. Upon starting the field current control means 9 to supply power to the field winding 5 following the field command, either all of the switching elements 14u to 14w of the lower arms of the power converter 6 or all of the switching elements 13u to 13w of the upper arms are turned on, thus the armature winding 3 is short-circuited in every phase.

    [0038] Subsequently, either the field current detecting means detects the current of the field winding 5 or it is judged that the magnetic field has reached a predetermined target value on the basis of passage of a predetermined time. As a result, in the power converter 6, the mentioned on state of all the switching elements of either the upper arms or the lower arms is released to return the converter to its normal operation. At the same time, the power converter 6 is subject to PWM control to start application of current to the armature winding 3 so that the current comes to the same phase as that of the mentioned short-circuit current preliminarily detected.

    [0039] As a result of controlling the application of current as described above, it is possible to control the d-axis current without us ing any magnetic field position detection information and computing means for computing a d-axis value of the current component. Thus it is possible to shorten the rise time of the field current. In other words, as the mentioned short-circuit current flows through the d-axis position, the inductance can be cancelled by applying a current of same phase as that of the short circuit current. Furthermore, since it is obvious that the short-circuit current flows through the d-axis position, it is possible to obtain information on the rotational position of the rotator without using any sensor by adding detection means capable of detecting at least two phases among the short-circuit current. In this manner, field flux control is achieved at a reasonable cost.


    Claims

    1. A control method of an electric rotating machine for a vehicle, the electric rotating machine comprising:

    a Randell-type multipolar rotator core (4) having a field winding (5);

    a stator having an armature winding (3);

    field current control means (9) for controlling a field current supplied from a direct-current power source to said field winding (5); and

    a power converter (6) for converting a power of said direct-current power source into an alternating-current power and supplying the electric power to said armature winding (3),

    wherein when said field current control means (9) starts to supply a current to said field winding (5) for starting an internal combustion engine, said power converter (6) supplies a power to said armature winding (3) so that a magnetic flux in a direction opposite to a field flux of said field winding (5) is generated simultaneously with or immediately before starting the supply of current to the field winding (5).


     
    2. The control method of an electric rotating machine for vehicle according to claim 1, wherein either said field current control means (9) or said power converter (6) or both of them controls a current value so that sum of the field flux generated by said field winding (5) at a central position of a magnetic field pole of said rotator and the magnetic flux generated by the armature winding (3) is substantially constant.
     
    3. The control method of an electric rotating machine for vehicle according to claim 1, wherein either said field current control means (9) or said power converter (6) or both of them controls a current value so that the field flux generated by said field winding (5) at a central position of a magnetic field pole of said rotator is substantially equal to the magnetic flux generated by the armature winding (3).
     
    4. A control method of an electric rotating machine for a vehicle, the electric rotating machine comprising:

    a Randell-type multipolar rotator core (4) having a field winding (5);

    a stator having an armature winding (3);

    field current control means (9) for controlling a field current supplied from a direct-current power source to said field winding (5); and

    a power converter (6) comprised of a three-phase six-arm voltage-fed inverter (13U-13W, 14U-14W) for converting a power of said direct-current power source into an alternating-current power and applying the power to said armature winding (3),

    wherein when said field current control means (9) starts to supply a current to the field winding (5) for starting an internal combustion engine, all of either upper arms or lower arms of said inverter are brought into a conductive state so as to bring said armature winding (3) into a short-circuited state.


     
    5. The control method of an electric rotating machine for vehicle according to claim 4, wherein when a short-circuit field current generated at the time of short-circuiting said armature winding (3) is measured and it is detected that said short - circuit field current has reached a predetermined value or when a predetermined time has passed from starting the current supply to said field winding (5), said inverter (13U-13W, 14U-14W) is released from the state in which all of the upper or lower arms (13U-13W or 14U-14W) are in the conductive state and supplies said armature winding (3) with an armature current so that the current comes to the same phase as that of said short-circuit current.
     
    6. The control method of an electric rotating machine for vehicle according to any one of claims 1 to 5, wherein a magnetic field generated by said field winding (5), said field winding (5) being wound so that a rotary shaft (7) serves as a magnetic circuit, and a magnetic field generated by a permanent magnet (12) are used together as a magnetic field of said rotator, and wherein said permanent magnet (12) is magnetized so that the field flux generated by said field winding (5) and the field flux generated by said permanent magnet (12) are in opposite direction with respect to said rotary shaft (7).
     


    Ansprüche

    1. Steuerverfahren für eine elektrische Rotationsmaschine für ein Fahrzeug, wobei die elektrische Rotationsmaschine umfasst:

    einen multipolaren Rotorkern (4) vom Randelltyp mit einer Feldwicklung (5);

    einen Stator mit einer Ankerwicklung (3);

    ein Feldstrom-Steuermittel (9) zum Steuern eines Feldstroms, der von einer Gleichstromquelle an die Feldwicklung (5) geliefert wird; und

    einen Stromrichter (6) zum Umwandeln eines Stroms der Gleichstromquelle in Wechselstrom und zum Liefern des elektrischen Stroms an die Ankerwicklung (3),

    wobei, wenn das Feldstrom-Steuermittel (9) damit beginnt, einen Strom an die Feldwicklung (5) zum Starten eines Verbrennungsmotors zu liefern, der Stromrichter (6) einen Strom an die Ankerwicklung (3) liefert, sodass ein Magnetfluss in einer Richtung entgegengesetzt zu einem Feldfluss der Feldwicklung (5) gleichzeitig mit oder unmittelbar vor einem Starten der Stromlieferung an die Feldwicklung (5) erzeugt wird.


     
    2. Steuerverfahren für eine elektrische Rotationsmaschine für ein Fahrzeug nach Anspruch 1, wobei entweder das Feldstrom-Steuermittel (9) oder der Stromrichter (6) oder beide einen Stromwert so steuert, dass die Summe des Feldflusses, der von der Feldwicklung (5) an einer zentralen Position eines Magnetfeldpols des Rotors erzeugt wird, und des von der Ankerwicklung (3) erzeugten Magnetflusses im Wesentlichen konstant ist.
     
    3. Steuerverfahren einer elektrischen Rotationsmaschine für ein Fahrzeug nach Anspruch 1, wobei entweder das Feldstrom-Steuermittel (9) oder der Stromrichter (6) oder beide einen Stromwert so steuert, dass die Summe des Feldflusses, der von der Feldwicklung (5) an einer zentralen Position eines Magnetfeldpols des Rotors erzeugt wird, im Wesentlichen gleich ist zu dem von der Ankerwicklung (3) erzeugten Magnetfluss.
     
    4. Steuerverfahren für eine elektrische Rotationsmaschine für ein Fahrzeug, wobei die elektrische Rotationsmaschine umfasst:

    einen multipolaren Rotorkern (4) vom Randelltyp mit einer Feldwicklung (5);

    einen Stator mit einer Ankerwicklung (3);

    ein Feldstrom-Steuermittel (9) zum Steuern eines Feldstroms, der von einer Gleichstromquelle an die Feldwicklung (5) geliefert wird; und

    einen Stromrichter (6), umfassend einen DreiphasenSechsarm-Spannungszuführung-Inverter (13U-13W, 14U-14W) zum Umwandeln eines Stroms der Gleichstromquelle in Wechselstrom und zum Liefern des Stroms an die Ankerwicklung (3),

    wobei, wenn das Feldstrom-Steuermittel (9) damit beginnt, einen Strom an die Feldwicklung (5) zum Starten eines Verbrennungsmotors zu liefern, alle entweder oberen Arme oder unteren Arme des Inverters in einen leitenden Zustand gebracht werden, um die Ankerwicklung (3) in einen kurz geschlossenen Zustand zu bringen.


     
    5. Steuerverfahren einer elektrischen Rotationsmaschine für ein Fahrzeug nach Anspruch 4, wobei, wenn ein Kurzschluss-Feldstrom, der zu einer Zeit eines Kurzschlusses der Ankerwicklung (3) erzeugt wird, gemessen wird, und erfasst wird, dass der Kurzschluss-Feldstrom einen vorbestimmten Wert erreicht hat, oder wenn eine vorbestimmte Zeit vom Start der Stromlieferung an die Feldwicklung (5) verstrichen ist, der Inverter (13U-13W, 14U-14W) aus dem Zustand entlassen wird, in dem alle der oberen oder unteren Arme (13U-13W oder 14U-14W) in dem leitenden Zustand sind und die Ankerwicklung (3) mit einem Ankerstrom versorgt, sodass der Strom in die gleiche Phase wie diejenige des Kurzschlussstroms kommt.
     
    6. Steuerverfahren für eine elektrische Rotationsmaschine für ein Fahrzeug nach einem der Ansprüche 1 bis 5, wobei ein von der Feldwicklung (5) erzeugtes Magnetfeld, wobei die Feldwicklung (5) so gewickelt ist, dass eine Rotationswelle (7) als eine Magnetschaltung dient, und ein von einem Permanentmagneten (12) erzeugtes Magnetfeld zusammen als Magnetfeld des Rotors verwendet werden, und wobei der Permanentmagnet (12) so magnetisiert ist, dass der von der Feldwicklung (5) erzeugte Feldfluss und der von dem Permanentmagneten (12) erzeugte Feldfluss in entgegengesetzter Richtung hinsichtlich der Rotationswelle (7) sind.
     


    Revendications

    1. Procédé de commande d'une machine électrique tournante destinée à un véhicule, la machine électrique tournante comprenant :

    un noyau de rotateur multipolaire de type Randell (4) comportant un enroulement de champ (5) ;

    un stator comportant un enroulement d'induit (3) ;

    un moyen de commande de courant d'excitation (9) destiné à commander un courant d'excitation fourni depuis une source d'alimentation en courant continu audit enroulement de champ (5) ; et

    un convertisseur de puissance (6) destiné à convertir une puissance de ladite source d'alimentation en courant continu en une puissance en courant alternatif et à fournir la puissance électrique audit enroulement d'induit (3),

    dans lequel lorsque ledit moyen de commande de courant d'excitation (9) commence à fournir un courant audit enroulement de champ (5) pour démarrer un moteur à combustion interne, ledit convertisseur de puissance (6) fournit une puissance audit enroulement d'induit (3), de manière qu'un flux magnétique dans une direction opposée à un flux d'excitation dudit enroulement de champ (5) soit engendré simultanément au démarrage de l'alimentation en courant de l'enroulement de champ (5) ou immédiatement avant celui-ci.


     
    2. Procédé de commande d'une machine électrique tournante destinée à un véhicule, selon la revendication 1, dans lequel soit ledit moyen de commande de courant d'excitation (9) soit ledit convertisseur de puissance (6) soit encore les deux commande(nt) une intensité de manière que la somme du flux d'excitation engendré par ledit enroulement de champ (5) à une position centrale de pôle de champ magnétique dudit rotateur, et du flux magnétique engendré par l'enroulement d'induit (3) soit sensiblement constante.
     
    3. Procédé de commande d'une machine électrique tournante destinée à un véhicule, selon la revendication 1, dans lequel soit ledit moyen de commande de courant d'excitation (9) soit ledit convertisseur de puissance (6) soit encore les deux commande(nt) une intensité de manière que le flux d'excitation engendré par ledit enroulement de champ (5) à une position centrale de pôle de champ magnétique dudit rotateur soit sensiblement égal au flux magnétique engendré par l'enroulement d'induit (3).
     
    4. Procédé de commande d'une machine électrique tournante destinée à un véhicule, la machine électrique tournante comprenant :

    un noyau de rotateur multipolaire de type Randell (4) comportant un enroulement de champ (5) ;

    un stator comportant un enroulement d'induit (3) ;

    un moyen de commande de courant d'excitation (9) destiné à commander un courant d'excitation fourni depuis une source d'alimentation en courant continu audit enroulement de champ (5) ; et

    un convertisseur de puissance (6) composé d'un onduleur triphasé à six bras alimenté en tension (13U à 13W, 14U à 14W) destiné à convertir une puissance de ladite source d'alimentation en courant continu en une puissance en courant alternatif et à appliquer la puissance audit enroulement d'induit (3),

    dans lequel lorsque ledit moyen de commande de courant d'excitation (9) commence à fournir un courant audit enroulement de champ (5) pour démarrer un moteur à combustion interne, la totalité des bras supérieurs ou des bras inférieurs dudit onduleur est mise à l'état conducteur de manière à mettre ledit enroulement d'induit (3) à l'état de court-circuit.


     
    5. Procédé de commande d'une machine électrique tournante destinée à un véhicule, selon la revendication 4, dans lequel lorsqu'un courant de court-circuit d'excitation engendré au moment de la mise en court-circuit dudit enroulement d'induit (3) est mesuré et qu'il est détecté que ledit courant de court-circuit d'excitation a atteint une valeur prédéterminée ou qu'un temps prédéterminé s'est écoulé depuis le démarrage de l'alimentation en courant dudit enroulement de champ (5), ledit onduleur (13U à 13W, 14U à 14W) est mis hors de l'état dans lequel la totalité des bras supérieurs ou inférieurs (13U à 13W ou 14U à 14W) est à l'état conducteur et fournit audit enroulement d'induit (3) un courant d'induit, de manière que le courant arrive sur la même phase que celle dudit courant de court-circuit.
     
    6. Procédé de commande d'une machine électrique tournante destinée à un véhicule, selon l'une quelconque des revendications 1 à 5, dans lequel un champ magnétique engendré par ledit enroulement de champ (5), ledit enroulement de champ (5) étant enroulé de manière qu'un arbre rotatif (7) serve de circuit magnétique, et un champ magnétique engendré par un aimant permanent (12) sont utilisés ensemble en tant que champ magnétique dudit rotateur, et dans lequel ledit aimant permanent (12) est aimanté de manière que le flux d'excitation engendré par ledit enroulement de champ (5) et le flux d'excitation engendré par ledit aimant permanent (12) soient dans une direction opposée par rapport audit arbre rotatif (7).
     




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    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description