(19)
(11)EP 2 395 645 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
14.03.2012 Bulletin 2012/11

(43)Date of publication A2:
14.12.2011 Bulletin 2011/50

(21)Application number: 11160586.1

(22)Date of filing:  31.03.2011
(51)Int. Cl.: 
H02M 7/00  (2006.01)
H02K 16/04  (2006.01)
H02P 25/22  (2006.01)
H02J 3/00  (2006.01)
H02M 5/40  (2006.01)
(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
Designated Extension States:
BA ME

(30)Priority: 15.04.2010 FI 20105396

(71)Applicant: ABB Oy
00380 Helsinki (FI)

(72)Inventors:
  • Pasuri, Osmo
    03250, Ojakkala (FI)
  • Virtanen, Reijo
    01600, Vantaa (FI)
  • Keronen, Jorma
    02760, Espoo (FI)

(74)Representative: Valkeiskangas, Tapio Lassi Paavali 
Kolster Oy Ab Iso Roobertinkatu 23 P.O. Box 148
00121 Helsinki
00121 Helsinki (FI)

  


(54)Method and arrangement in connection with electric drive system


(57) An arrangement in connection with an electric drive system, the electric drive system comprising an intermediate circuit (DC), with two or more supply units (S.1-S.n) and two or more inverter units (I.1-I.n) connected thereto, and an electric machine (G) having two or more three-phase windings galvanically separated from each other. Two or more inverter units (I.1-I.n) are connected to the three-phase windings. The arrangement further comprises first main circuit switches (X11.1-X11.n) to galvanically separate each supply unit (S.1-S.n) from a supply, second main circuit switches (X12.1-X12.n) to galvanically separate each supply unit (S.1-S.n) from the intermediate circuit (DC), first intermediate circuit switches (X21.1-X21.n) to galvanically separate each inverter unit (I.1-I.n) from the intermediate circuit (DC), and second intermediate circuit switches (X22.1-X22.n) to galvanically separate each inverter unit (I.1-I. n) from the electric machine (G).