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Method for switching off a multi-phase electric machine in a motor vehicle

A technology of polyphase motors, motor vehicles, applied in the field of computer programs to solve problems such as undesired

Active Publication Date: 2022-03-01
ROBERT BOSCH GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the phase voltages are first switched off here, a current flow through the reverse diode of the MOSFET would result due to the excitation current still flowing and thus lead to an undesired dynamo operation for this operating state

Method used

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  • Method for switching off a multi-phase electric machine in a motor vehicle
  • Method for switching off a multi-phase electric machine in a motor vehicle
  • Method for switching off a multi-phase electric machine in a motor vehicle

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Embodiment Construction

[0029] figure 1 Components of a motor vehicle are schematically shown. The motor vehicle has an electric machine 110 , an externally excited synchronous generator being the starting point below without limiting the generality. Electric machine 110 can be operated, for example, as a generator by internal combustion engine 109 of the motor vehicle. The electric machine 110 is connected in a torque-locked manner to the internal combustion engine 109 via a corresponding coupling means, for example a mechanical connection 108 in the form of a belt or a shaft. Alternatively, electric machine 110 can also be operated as a motor and can support internal combustion engine 109 here.

[0030] The electric machine 110 is electrically connected to the current converter 106 , wherein a plurality of phase connections 107 are provided. The current converter 106 can operate as a rectifier or as an inverter. The plurality of phase connections 107 are the phase connections of the multiphase ...

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PUM

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Abstract

The invention relates to a method for switching off a polyphase electric machine (110) in a motor vehicle, wherein the polyphase electric machine (110) comprises a rotor with a rotor winding (101) and a stator winding with multiple phases (110a ) of the stator, where, in block operation (210) of the motor (110), the inductor voltage vector (U p ) parameters are changed such that the inductor voltage reaches the first threshold (S 1 ), where the block runs (210) upon reaching the first threshold (S 1 ) is deactivated, and is applied with a phase voltage vector (U s ) phase voltage PWM operation (220) is activated, where the phase voltage vector (U s ) and the inductor voltage vector (U p ) is changed during PWM operation (220) until the parameter affecting the inductor voltage reaches another threshold (S 2 ), where, when another threshold is reached (S 2 ), the phase voltage (U s ) is turned off. The invention also relates to a computing unit ( 112 ) configured to implement the method.

Description

technical field [0001] The invention relates to a method for switching off a multiphase electric machine in a motor vehicle as well as to a computing unit and a computer program for carrying out the method. Background technique [0002] It is known that electric machines in motor vehicles can be operated as generators or motors. Motors of this type generally comprise a rotor with exciter windings (rotor windings) and a stator with multiphase stator windings, which can be energized with excitation currents, to which stator windings with phase voltage vectors can be applied Phase voltages of multiple phases. [0003] The use of electric motors in motor vehicles may require frequent turning on and off of the electric motor. Switching off the electric machine, especially at high rotational speeds, can prove to be problematic. If the phase voltages were switched off first, a current would flow through the reverse diode of the MOSFET due to the still flowing excitation current ...

Claims

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Application Information

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IPC IPC(8): H02P3/18H02P23/20H02P27/06H02P27/08H02P25/024H02P25/22B60L15/28
CPCH02P25/22H02P27/06H02P27/08H02P3/18H02P23/0027H02P23/20H02P25/024Y02T10/72H02P21/22H02P21/30H02P27/12
Inventor J.勒斯纳
Owner ROBERT BOSCH GMBH
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