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1. (WO2018099701) METHOD FOR SWITCHING OFF A CURRENT-EXCITED SYNCHRONOUS MACHINE OF A MOTOR VEHICLE

Pub. No.:    WO/2018/099701    International Application No.:    PCT/EP2017/078622
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Thu Nov 09 00:59:59 CET 2017
IPC: H02P 3/18
H02P 25/022
H02P 27/06
Applicants: BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT
Inventors: EL KHAWLY, Zakaria
GUSYEV, Igor
MERWERTH, Joerg
SILVA CERQUEIRA, Nuno Miguel
STEINBAUER, Christian
Title: METHOD FOR SWITCHING OFF A CURRENT-EXCITED SYNCHRONOUS MACHINE OF A MOTOR VEHICLE
Abstract:
The invention relates to a method for switching off a current-excited synchronous machine of a motor vehicle comprising a rotor (R) and a stator (S) and supplied by means of power electronics, wherein the rotor (R) is supplied via an excitation circuit (20) of the power electronics and the stator (S) is supplied via a bridge circuit (30) of the power electronics. The method comprises the following steps: interrupting the current supply to the rotor (R) and the stator (S); switching the excitation circuit (20) into a first freewheeling position, so that the energy contained in the excitation circuit (20) and in the rotor (R) is fed into a first energy storage device (HVS1) via a first feedback arrangement (D2, D3); and switching the bridge circuit (30) into a second freewheeling position, so that the energy contained in the bridge circuit (30) and in the stator (S) is fed into a second energy storage device (HVS2) via a second feedback arrangement (D5-D10).