Method for switching on a multi-phase electrical machine in a motor vehicle

Patent metadata

Field	Value
Publication number	US-10079562-B2
Application number	US-201615565646-A
Country	US
Kind code	B2
Filing date	Mar 21, 2016
Priority date	May 6, 2015
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A method for switching on a multi-phase electrical machine in a motor vehicle, the multi-phase electrical machine having a rotor having a rotor winding, and a stator having a multi-phase stator winding; a phase voltage having a phase voltage vector being applied, in a PWM operating mode, to the stator winding, said vector corresponding in terms of absolute magnitude and direction to a pole wheel voltage vector of a pole wheel voltage; the rotor winding being energized by an excitation current; and the PWM operating mode being deactivated, and a block operating mode for application of the phase voltage being activated, when at least one parameter influencing the pole wheel voltage reaches a threshold value.

First claim

What is claimed is:

1. A method for switching on a multi-phase electrical machine in a motor vehicle, the multi-phase electrical machine having a rotor having a rotor winding, and a stator having a multi-phase stator winding, the method comprising:
applying a phase voltage having a phase voltage vector, in a PWM operating mode, to the stator winding, the vector corresponding in terms of absolute magnitude and direction to a pole wheel voltage vector of a pole wheel voltage;
energizing the rotor winding by an excitation current; and
deactivating the PWM operating mode, and activating a block operating mode for application of the phase voltage when at least one parameter influencing the pole wheel voltage reaches a threshold value.

2. The method as recited in claim 1 , wherein at least one of an absolute value of the pole wheel voltage vector, and a direction of the pole wheel voltage vector, is used as the at least one parameter influencing the pole wheel voltage.

3. The method as recited in claim 1 , wherein the threshold value corresponds to an absolute value of the phase voltage vector or a direction of the phase voltage vector of the phase voltage to be applied in the block operating mode.

4. The method as recited in claim 3 , wherein the absolute value of the phase voltage vector of the phase voltage to be applied in the block operating mode is defined by a DC voltage of an electrical system, connected to the electrical machine, of the motor vehicle.

5. The method as recited in claim 3 , wherein at least one of an absolute value of the excitation current, and a rotation speed of the electrical machine, is used as the at least one parameter influencing the pole wheel voltage.

6. The method as recited in claim 1 , wherein, in the block operating mode, a torque is set by specifying a specific pole wheel angle between the phase voltage and the pole wheel voltage.

7. The method as recited in claim 1 , wherein the electrical machine is operated in motor mode or generator mode.

8. A computation unit for switching on a multi-phase electrical machine in a motor vehicle, the multi-phase electrical machine having a rotor having a rotor winding, and a stator having a multi-phase stator winding, the computation unit designed to:
apply a phase voltage having a phase voltage vector, in a PWM operating mode, to the stator winding, the vector corresponding in terms of absolute magnitude and direction to a pole wheel voltage vector of a pole wheel voltage;
energize the rotor winding by an excitation current; and
deactivate the PWM operating mode, and activate a block operating mode for application of the phase voltage when at least one parameter influencing the pole wheel voltage reaches a threshold value.

9. A non-transitory machine-readable storage medium on which is stored a computer program for switching on a multi-phase electrical machine in a motor vehicle, the multi-phase electrical machine having a rotor having a rotor winding, and a stator having a multi-phase stator winding, the computer program, when executed by a computation unit, causing the computation unit to perform:
applying a phase voltage having a phase voltage vector, in a PWM operating mode, to the stator winding, the vector corresponding in terms of absolute magnitude and direction to a pole wheel voltage vector of a pole wheel voltage;
energizing the rotor winding by an excitation current; and
deactivating the PWM operating mode, and activating a block operating mode for application of the phase voltage when at least one parameter influencing the pole wheel voltage reaches a threshold value.

Assignees

• Bosch Gmbh Robert
• Seg Automotive Germany Gmbh

Inventors

• Roesner Julian

Classifications

• H02P21/0085

  specially adapted for high speeds, e.g. above nominal speed · CPC title

• H02P1/46 Primary

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

• H02P21/34

  Arrangements for starting · CPC title

• H02P21/24

  Vector control not involving the use of rotor position or rotor speed sensors · CPC title

• H02P27/085 Primary

  wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency · CPC title