Methods for switching on and for switching off an n-phase electric machine in a motor vehicle

Patent metadata

Field	Value
Publication number	US-2016181963-A1
Application number	US-201414909679-A
Country	US
Kind code	A1
Filing date	Jul 24, 2014
Priority date	Aug 2, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

A method is provided for switching on and switching off an n-phase electric machine in a motor vehicle. The n-phase electric machine includes a rotor with a rotor winding, and a stator with an n-phase stator winding. An excitation current may be applied to the rotor, and an n-phase phase voltage may be applied to the stator. The excitation current is switched on or off, a parameter which influences a synchronous generated internal voltage is determined, and the phase voltage is switched on or off when the parameter which influences the synchronous generated internal voltage reaches a certain threshold value.

First claim

1 .- 12 . (canceled)

13 . A method for switching on an n-phase electric machine in a motor vehicle, the n-phase electric machine that includes a rotor with a rotor winding and to which an excitation current may be applied, and a stator with an n-phase stator winding and to which an n-phase voltage may be applied, the method comprising:
switching on the excitation current; determining a parameter which influences a synchronous generated internal voltage; and switching on the phase voltage when the parameter which influences the synchronous generated internal voltage reaches a certain threshold value.

14 . The method as recited in claim 13 , further comprising setting a torque with the aid of a phase angle of the phase voltage when the phase voltage is switched on.

15 . A method for switching off an n-phase electric machine in a motor vehicle, the n-phase electric machine including a rotor with a rotor winding and to which an excitation current may be applied, and a stator with an n-phase stator winding and to which an n-phase voltage may be applied, the method comprising:
switching off the excitation current; determining a parameter which influences a synchronous generated internal voltage; and switching off the phase voltage when the parameter which influences the synchronous generated internal voltage reaches a certain threshold value.

16 . The method as recited in claim 15 , further comprising setting a torque to a certain value with the aid of a phase angle of the phase voltage before the excitation current is switched off.

17 . The method as recited in claim 16 , wherein the torque is set to zero.

18 . The method as recited in claim 13 , wherein the synchronous generated internal voltage is determined as the parameter which influences the synchronous generated internal voltage.

19 . The method as recited in claim 18 , wherein the certain threshold value of the synchronous generated internal voltage, as the parameter which influences the synchronous generated internal voltage, corresponds to an instantaneous voltage value of the phase voltage.

20 . The method as recited in claim 13 , wherein at least one of the excitation current and a rotational speed of the electric machine is determined as the parameter which influences the synchronous generated internal voltage.

21 . The method as recited in claim 13 , wherein the electric machine is operated in one of a motor mode or a generator mode.

22 . A processing unit configured for carrying out a method for switching on an n-phase electric machine in a motor vehicle, the n-phase electric machine that includes a rotor with a rotor winding and to which an excitation current may be applied, and a stator with an n-phase stator winding and to which an n-phase voltage may be applied, the method comprising:
switching on the excitation current; determining a parameter which influences a synchronous generated internal voltage; and switching on the phase voltage when the parameter which influences the synchronous generated internal voltage reaches a certain threshold value.

23 . A computer program which prompts a processing unit to carry out a method for switching on an n-phase electric machine in a motor vehicle, the n-phase electric machine that includes a rotor with a rotor winding and to which an excitation current may be applied, and a stator with an n-phase stator winding and to which an n-phase voltage may be applied, the method comprising:
switching on the excitation current; determining a parameter which influences a synchronous generated internal voltage; and switching on the phase voltage when the parameter which influences the synchronous generated internal voltage reaches a certain threshold value.

24 . A machine-readable memory medium having a computer program which prompts a processing unit to carry out a method for switching on an n-phase electric machine in a motor vehicle, the n-phase electric machine that includes a rotor with a rotor winding and to which an excitation current may be applied, and a stator with an n-phase stator winding and to which an n-phase voltage may be applied, the method comprising:
switching on the excitation current; determining a parameter which influences a synchronous generated internal voltage; and switching on the phase voltage when the parameter which influences the synchronous generated internal voltage reaches a certain threshold value.

Assignees

• Bosch Gmbh Robert

Inventors

• Ersek Zoltan
• Roesner Julian

Classifications

• H02P25/22 Primary

  Multiple windings; Windings for more than three phases · CPC title

• H02P1/46 Primary

  for starting an individual synchronous motor {(H02P27/04 takes precedence)} · CPC title