(19)
(11)EP 2 961 046 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
07.09.2022 Bulletin 2022/36

(21)Application number: 15172359.0

(22)Date of filing:  16.06.2015
(51)International Patent Classification (IPC): 
H02K 5/15(2006.01)
H02K 5/22(2006.01)
H02K 11/33(2016.01)
(52)Cooperative Patent Classification (CPC):
H02K 5/15; H02K 11/33; H02K 5/225

(54)

ELECTRONICALLY COMMUTATED MOTOR WITH END CAPS AND POWER CONNECTION

ELEKTRONISCH KOMMUTIERTER MOTOR MIT ENDKAPPEN UND STROMANSCHLUSS

MOTEUR À COMMUTATION ÉLECTRONIQUE AVEC EMBOUTS ET CONNEXION ÉLECTRIQUE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 24.06.2014 IT PD20140163

(43)Date of publication of application:
30.12.2015 Bulletin 2015/53

(60)Divisional application:
16181616.0 / 3109976

(73)Proprietor: Amer S.p.A.
36078 Valdagno (VI) (IT)

(72)Inventors:
  • BATTISTELLA, Francesco
    36078 VALDAGNO VI (IT)
  • DALLA COSTA, Mirko
    36015 SCHIO VI (IT)

(74)Representative: Modiano, Micaela Nadia et al
Modiano & Partners Via Meravigli, 16
20123 Milano
20123 Milano (IT)


(56)References cited: : 
EP-A1- 1 947 343
DE-A1-102005 056 209
US-A1- 2014 132 122
DE-A1- 4 122 529
DE-A1-102009 046 192
  
      
    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


    [0001] The present invention relates to a brushless motor.

    [0002] Currently known brushless motors comprise usually a casing for containing a stator body and a rotor with driving shaft, an exit cap with an outlet for said driving shaft and a closure cap, which is opposite said exit cap, which supports an electronic board for controlling the brushless motor and comprises an output for power cables.

    [0003] Currently, the need is felt increasingly to have a brushless motor which is dimensionally compact, both axially and radially, and in which at the same time the electronic board is in a protected position that is easily accessible in case of repair or replacement.

    [0004] In a known type of brushless motor, the electronic control board, usually an encoder, is arranged outside the cap, inside a protective hood that is extended externally to said cap in an axial direction.

    [0005] This solution, though having the merit of allowing easy adjustment of the encoder, which is easily accessible by removing the hood, which is external to the cap, without having to disassemble the cap from the brushless motor proper, suffers the drawback that it increases significantly the axial space occupations of the motor and determines a single output for cables which is radial with respect to the motor, an arrangement that is a limitation for applications requiring a reduced radial space occupation.

    [0006] In a further, different, type of brushless motor, in order to reduce axial space occupations the encoder is arranged inside the cap, fixed to an annular portion that extends from said cap and is coaxial to the rotation axis of the driving shaft, in a region located further inward than the bearings for the driving shaft on the side of said cap.

    [0007] This arrangement of the encoder, while making the motor more compact axially, makes it impossible to access the encoder except by disassembling the cap, and this entails the loss of the protection degree and makes the operation of synchronization between the signal of the encoder and the rotor magnetic field more difficult; as is known, this synchronization is necessary for the operation of a brushless motor. Documents EP 1 947 343 A, DE 10 2005 056209 A, DE 102009 049192 A, DE 41 22 529 A and US 2014/132122 A disclose compact brushless motors comprising different solutions to integrate terminal strips and electronic circuit board into a single cap.

    [0008] The aim of the present invention is to provide a brushless motor capable of obviating the cited limitations of the background art.

    [0009] Within this aim, an object of the invention is to provide a brushless motor capable of combining compactness and ease of access to an electronic control board.

    [0010] A further object of the invention is to provide a brushless motor that is simpler to assemble than the known brushless motors cited above.

    [0011] Another object of the invention is to provide a brushless motor with a capacity and efficiency that are not lower than similar brushless motors of the known type.

    [0012] This aim and these and other objects that will become better apparent hereinafter are achieved by a brushless motor, comprising a casing for containing a stator body and a rotor with a driving shaft, an exit cap with an outlet for said driving shaft and a closure cap, which is opposite said exit cap and supports an electronic board for controlling the brushless motor and comprises an output for power cables, characterized in that said closure cap has a recess for containing said electronic control board, which is defined so as to be recessed in an axial direction with respect to the outer surface of said cap.

    [0013] Further characteristics and advantages of the invention will become better apparent from the description of a preferred but not exclusive embodiment of the brushless motor according to the invention, illustrated by way of non-limiting example in the accompanying drawings, wherein:

    Figure 1 is a side view of a brushless motor according to the invention;

    Figure 2 is an exploded perspective view of a cap of the brushless motor according to the invention;

    Figure 3 is a schematic sectional side view of the brushless motor according to the invention;

    Figure 4 is a side view of a portion of the brushless motor according to the invention;

    Figure 5 is a perspective view of a portion of a cap of the brushless motor according to the invention;

    Figure 6 is a further perspective view of the cap portion of Figure 5;

    Figure 7 is a detailed sectional side view of the brushless motor according to the invention;

    Figure 8 is a schematic longitudinal sectional view of the brushless motor of a known type;

    Figures 9 and 10 are views of a first example of application of the brushless motor according to the invention;

    Figure 11 is a view of a second example of application of the brushless motor according to the invention;

    Figures 12 and 13 are views of a third example of application of the brushless motor according to the invention.



    [0014] With reference to the figures, a brushless motor according to the invention is designated generally by the reference numeral 10.

    [0015] This brushless motor comprises a casing 11 for containing a stator body and for a rotor with a driving shaft 12, an exit cap 13 with an outlet for the driving shaft 12 and a closure cap 14, which is opposite the exit cap 13.

    [0016] The cap 14 supports an electronic board 15 for controlling the brushless motor, for example an encoder.

    [0017] The cap 14 also comprises an output for power cables.

    [0018] The particularity of the brushless motor 10 according to the invention resides in that the closure cap 14 has a recess 16 for containing the electronic control board 15, which is defined so as to be recessed in an axial direction X with respect to the outer surface 17 of the cap 14.

    [0019] In particular, in the present constructive example, the recess 16 is constituted by a hollow having a circular profile that is extended in an axial direction toward the inside of the brushless motor 10 for such a depth that the electronic control board 15 is inserted entirely therein, and therefore the control board 15 does not cause any axial space occupation in addition to that of the set constituted by the casing 11, the exit cap 13 and the cap 14 when assembled.

    [0020] The recess 16 is provided due to the axial movement, toward the inside of the brushless motor 10, of the position of a seat 31 of a bearing 32 that supports the driving shaft 12 on the side of the electronic control board 15, as clearly visible in Figure 7.

    [0021] The provision of this position of the seat 31 for the bearing 32 is made possible thanks to the fact that the rotor is axially less bulky than the stator, thus rendering usable the space that is axially adjacent to the lamination pack of the brushless motor.

    [0022] Figure 7 shows a stator winding 33 and the space occupation of the laminations 34 of which the rotor is composed.

    [0023] Figure 8 is a schematic longitudinal sectional view of a brushless motor of a known type, designated generally by A, which highlights the space occupation B of the stator windings, the space occupation C of the rotor lamination pack, and the space D available between the rotor and the seat for the bearing E; it is clearly visible how in this known motor A there is a cap F for containment and protection of the encoder that is extended axially well beyond the space occupations of the closure cap G.

    [0024] In the brushless motor 10 according to the invention, the bearing seat 31 has been moved so as to occupy part of the available space D indicated above of known motors, so as to be able to create in the closure cap 14 a space useful for inserting and protecting the encoder, i.e., the recess 16.

    [0025] Moreover, the closure cap 14 has a channel 18 which lies between said recess 16 and the lateral surface 19 of the cap 14 and is preset to accommodate the passage of a power supply cable 20 for the electronic control board 15; the power supply cable 20 transmits both the power supply and the pulses/turn signal of the encoder.

    [0026] In this manner, the brushless motor 10 is preset for the passage of the power supply cable 20 of the electronic control board 15 so that the power supply cable 20 can be arranged in two different manners according to the space occupation requirements:
    • power supply cable 20 in the axial direction, as in Figure 1, if the radial space occupations must be contained,
    • power supply cable 20 exiting laterally by means of the channel 18, as in Figure 4, if the space occupations in an axial direction must be contained.


    [0027] The recess 16 is optionally closed by a plate-like cover 30, which is visible in the side views of Figure 1 and Figure 4 and is such as to not increase the axial space occupation of the brushless motor 10 according to the invention except by a few millimeters.

    [0028] The closure cap 14 also has a seat 35 that is contoured to accommodate a terminal strip 21 preset for the wiring of the power cables of the brushless motor.

    [0029] The seat 35 is open axially to allow direct access to the terminals 22 of said terminal strip 21 and radially for the lateral exit of the power cables.

    [0030] The terminal strip 21 is contoured to stay within the axial and radial space occupations of the cap 14 in the respective outward directions of the brushless motor 10, so that it does not cause increases in space occupation in the two cited directions.

    [0031] In the present constructive example, the seat 35 is arranged in a substantially perimetric region 36 of the cap 14.

    [0032] The terminal strip 21 is provided with extraction-preventing lateral raised portions 24 and 25 preset to abut against corresponding internal abutment portions of the cap 14.

    [0033] In particular, the terminal strip 21 is locked in its seat 35 by means of perimetric extraction-preventing lateral raised portions 24, which are closed between a corresponding internal portion 26 for the abutment of the cap 14, as in Figure 3, and a corresponding part 27 of the edge of the casing 11.

    [0034] In this manner, the terminal strip 21 is assembled without resorting to threaded joining elements or other components or to adapted connecting operations, such as welding or gluing.

    [0035] This solution with the terminal strip 21 locked between the casing 11 and the cap 14 allows faster and more economic assembly of the brushless motor 10.

    [0036] Moreover, from the terminals 22 the power cables can be connected so as to extend in an axial direction or in a substantially radial direction, depending on whether it is preferable to limit radial or axial space occupations respectively.

    [0037] The terminal strip 21 can be made of plastic material.

    [0038] Figures 9 and 10 are views of a first example of application of a brushless motor according to the invention, designated therein by the numeral 110, with a closure cap 114 as described above.

    [0039] In this example of application, the exit cap 113 is integrated with a portion 140 of a case 141 of a reduction unit 142.

    [0040] Figure 11 shows a second example of application of a brushless motor according to the invention, designated therein by the numeral 210, with a closure cap 214 as described above.

    [0041] In this example of application, the exit cap 213 is fixed to a differential unit 250 of an axle 251 of a vehicle, actuated by the driving shaft of the brushless motor 210.

    [0042] Figures 12 and 13 show a third example of application of a brushless motor according to the invention, designated therein by the numeral 310, with a closure cap 314.

    [0043] In this example of application, the brushless motor 310 is integrated in a wheel drive 360, with exit cap 313 and casing 311 supported by a bracket 361 for fixing to a transport of which said wheel drive 360 is part.

    [0044] Therefore, it is to be understood that the patent also relates to a brushless motor 110, 210 and 310, the exit cap 113, 213 and 313 of which has only partially, and not exclusively, the function of closing said brushless motor, or has the function of closing partially and not completely said brushless motor.

    [0045] It is understood that the invention also relates to a brushless motor 10, comprising a casing 11 for containing a stator body and a rotor with a driving shaft 12, an exit cap 13 with an outlet for the driving shaft 12 and a closure cap 14, which is opposite the exit cap 13 and supports an electronic board 15 for controlling the brushless motor and comprises an output for power cables, the particularity of which resides in that the closure cap 14 has a seat 35 that is contoured to accommodate a terminal strip 21 that is preset for the wiring of the power cables of the brushless motor, the terminal strip 21 being locked in its seat 35 by means of perimetric extraction-preventing lateral raised portions 24, which are closed between a corresponding internal portion 26 for the abutment of the cap 14 and a corresponding part 27 of the edge of the casing 11.

    [0046] In practice it has been found that the invention achieves the intended aim and objects.

    [0047] In particular, the invention has provided a brushless motor capable of combining compactness and ease of access to the electronic control board, by means of the specifically provided recess defined on the cap and extended toward the inside of the brushless motor in an axial direction; said recess allows immediate access and so does the electronic control board, encoder, contained therein.

    [0048] Moreover, the invention has provided a brushless motor that is easier to assemble than the known brushless motors cited above, by means of both the recess for the encoder and the terminal strip that is simply locked between the cap and the casing without resorting to threaded joining elements or other fixing system.

    [0049] Moreover, the invention has provided a brushless motor with a capacity and efficiency that are not lower than similar brushless motors of the known type.

    [0050] The invention thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims; moreover, all the details may be replaced with other technically equivalent elements.

    [0051] In practice, the materials used, so long as they are compatible with the specific use, as well as the contingent shapes and dimensions, may be any according to requirements and to the state of the art.

    [0052] This application claims priority of the Italian Patent application PD 2014 A 000163.

    [0053] Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.


    Claims

    1. A brushless motor (10), comprising a casing (11) for containing a stator body and for a rotor with a driving shaft (12), an exit cap (13) with an outlet for said driving shaft (12) and a closure cap (14), which is opposite said exit cap (13) and supports an electronic board (15) for controlling the brushless motor and comprises an output for power cables, said closure cap (14) having a recess (16) for containing said electronic control board (15), which is defined so as to be recessed according to an axial direction (X) to the outer surface (17) of said cap (14), said closure cap (14) having a seat (35) that is shaped to accommodate a terminal strip (21) preset for the wiring of the power cables of the brushless motor, characterized in that said seat (35) is open axially upwards to allow direct access to the terminals (22) of said terminal strip (21) and radially for the lateral exit of the power cables.
     
    2. The motor according to claim 1, characterized in that said recess (16) is constituted by a hollow having a circular profile, said hollow being extended in an axial direction toward the inside of said brushless motor (10) for such a depth that said electronic control board (15) is inserted entirely therein.
     
    3. The motor according to one or more of the preceding claims, characterized in that said closure cap (14) is provided with a channel (18) which lies between said recess (16) and the lateral surface (19) of said cap (14), preset to accommodate the passage of a power supply cable (20) for said electronic control board (15).
     
    4. The motor according to one or more of the preceding claims, characterized in that said terminal strip (21) is contoured to stay within an axial and radial space occupation of the cap (14) in respective outward directions of said brushless motor (10).
     
    5. The motor according to one or more of the preceding claims, characterized in that said seat (35) is arranged in a substantially perimetric region (36) of said cap (14), along the perimeter of the cap.
     
    6. The motor according to one or more of the preceding claims, characterized in that said terminal strip (21) is provided with lateral raised portions (24, 25) preset to abut against corresponding internal abutment portions of said cap (14) and adapted to prevent extraction of said terminal strip (21).
     
    7. The motor according to one or more of the preceding claims, characterized in that said terminal strip (21) is locked in its seat (35) by means of perimetric lateral raised portions (24) that are adapted to prevent the extraction of the terminal strip (21), said lateral raised portions being closed between a corresponding internal portion (26) for the abutment of said cap (14) and a corresponding part (27) of the edge of the casing (11).
     


    Ansprüche

    1. Ein bürstenloser Motor (10) der Folgendes umfasst: ein Gehäuse (11) zur Aufnahme eines Statorkörpers und eines Rotors mit einer Antriebswelle (12), eine Ausgangskappe (13) mit einem Auslass für die Antriebswelle (12) und eine Verschlusskappe (14), die der Ausgangskappe (13) gegenüberliegt und eine Leiterplatte (15), zur Steuerung des bürstenlosen Motors trägt und einen Ausgang für Stromkabel umfasst, wobei die Verschlusskappe (14) eine Vertiefung (16) zur Aufnahme der Leiterplatte (15) hat, die bestimmt ist um entsprechend einer axialen Richtung (X) zur äußeren Oberfläche (17) der Kappe (14) vertieft zu sein, wobei die Verschlusskappe (14) einen Sitz (35) hat, der geformt ist um eine Klemmleiste (21) aufzunehmen, die zur Verdrahtung der Stromkabel des bürstenlosen Motors voreingestellt ist, dadurch gekennzeichnet, dass der Sitz (35) axial nach oben offen ist, um direkten Zugriff auf die Klemmen (22) der Klemmleiste (21) zu ermöglichen und radial für den seitlichen Austritt der Stromkabel.
     
    2. Der Motor gemäß Anspruch 1, dadurch gekennzeichnet, dass die Vertiefung (16) aus einem Hohlraum mit einem kreisförmigen Profil besteht, wobei der Hohlraum sich in eine axiale Richtung zur Innenseite des bürstenlosen Motors (10) in einer solchen Tiefe erstreckt, dass die Leiterplatte (15) vollständig darin eingesetzt ist.
     
    3. Der Motor gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass die Verschlusskappe (14) mit einem Kanal (18) versehen ist, der zwischen der Vertiefung (16) und der seitlichen Oberfläche (19) der Kappe (14) liegt und voreingestellt ist, um den Durchgang eines Stromversorgungskabels (20) für die Leiterplatte (15) aufzunehmen.
     
    4. Der Motor gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass die Klemmleiste (21) konturiert ist um innerhalb eines axialen und radialen Raumbedarfs der Kappe (14), in entsprechenden Auswärtsrichtungen des bürstenlosen Motors (10) zu bleiben.
     
    5. Der Motor gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass der Sitz (35) in einem im wesentlichen perimetrischen Bereich (36) der Kappe (14), entlang dem Umfang der Kappe, angeordnet ist.
     
    6. Der Motor gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass die Klemmleiste (21) mit seitlichen erhöhten Abschnitten (24, 25) ausgestattet ist, die voreingestellt sind, um an entsprechende innere Wiederlagerabschnitte der Kappe (14) anzustoßen und ausgebildet, um das Herausziehen der Klemmleiste (21) zu verhindern.
     
    7. Der Motor gemäß einem oder mehreren der obigen Ansprüche, dadurch gekennzeichnet, dass die Klemmleiste (21) in ihrem Sitz (35) durch seitliche erhöhte Umfangsabschnitte (24) blockiert ist, die ausgebildet sind, um das Herausziehen der Klemmleiste (21) zu verhindern, wobei die seitlichen erhöhten Abschnitte zwischen einem entsprechenden inneren Abschnitt (26), für das Anstoßen der Kappe (14) und einem entsprechenden Teil (27) des Randes des Gehäuses (11) eingeschlossen sind.
     


    Revendications

    1. Moteur sans balai (10), comportant un carter (11) destiné à contenir une carcasse de stator et un rotor avec un arbre d'entraînement (12), un couvercle de sortie (13) avec une sortie pour ledit arbre d'entraînement (12) et un couvercle de fermeture (14), qui est opposé audit couvercle de sortie (13) et supporte une carte électronique (15) destinée à commander le moteur sans balai et comporte une sortie pour des câbles d'alimentation, ledit couvercle de fermeture (14) ayant un évidement (16) destiné à contenir ladite carte de commande électronique (15), qui est définie de manière à être évidée suivant une direction axiale (X) jusqu'à la surface extérieure (17) dudit couvercle (14), ledit couvercle de fermeture (14) ayant un logement (35) qui est formé pour recevoir un bornier (21) prédéfini pour le câblage des câbles d'alimentation du moteur sans balai, caractérisé en ce que ledit logement (35) est ouvert axialement vers le haut pour permettre un accès direct aux bornes (22) dudit bornier (21) et radialement pour la sortie latérale des câbles d'alimentation.
     
    2. Moteur selon la revendication 1, caractérisé en ce que ledit évidement (16) est constitué d'un creux ayant un profil circulaire, ledit creux s'étendant dans une direction axiale vers l'intérieur dudit moteur sans balai (10) sur une profondeur telle que ladite carte de commande électronique (15) est entièrement insérée dans celui-ci.
     
    3. Moteur selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit couvercle de fermeture (14) est pourvu d'un canal (18) qui se situe entre ledit évidement (16) et la surface latérale (19) dudit couvercle (14), prédéfini pour permettre le passage d'un câble d'alimentation (20) pour ladite carte de commande électronique (15).
     
    4. Moteur selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit bornier (21) est profilé pour rester à l'intérieur d'une occupation d'espace axial et radial du couvercle (14) dans des directions respectives vers l'extérieur dudit moteur sans balai (10).
     
    5. Moteur selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit logement (35) est agencé dans une zone sensiblement périmétrique (36) dudit couvercle (14), le long du périmètre du couvercle.
     
    6. Moteur selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit bornier (21) est pourvu de portions latérales surélevées (24, 25) prédéfinies pour venir en butée contre des portions de butée internes correspondantes dudit couvercle (14) et adaptées pour empêcher une extraction dudit bornier (21).
     
    7. Moteur selon une ou plusieurs des revendications précédentes, caractérisé en ce que ledit bornier (21) est bloqué dans son logement (35) au moyen de portions latérales périmétriques surélevées (24) qui sont adaptées pour empêcher l'extraction du bornier (21), lesdites portions latérales surélevées étant enfermées entre une portion interne (26) correspondante pour la butée dudit couvercle (14) et une partie correspondante (27) du bord du carter (11).
     




    Drawing





























    Cited references

    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