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Method for controlling a multi-phase electric machine by means of space vector modulation, control device, and drive arrangement

A technology of space vector modulation and control equipment, applied in control systems, motor control, AC motor control, etc., can solve the problems of rotor bearing durability and electromagnetic compatibility effects

Pending Publication Date: 2021-09-03
BAYERISCHE MOTOREN WERKE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These balancing currents are very small in magnitude but have a large impact on rotor bearing durability and electromagnetic compatibility

Method used

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  • Method for controlling a multi-phase electric machine by means of space vector modulation, control device, and drive arrangement
  • Method for controlling a multi-phase electric machine by means of space vector modulation, control device, and drive arrangement
  • Method for controlling a multi-phase electric machine by means of space vector modulation, control device, and drive arrangement

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Embodiment Construction

[0028] In the figures, identical or functionally identical elements are provided with the same reference symbols.

[0029] figure 1 A drive system 1 is shown schematically, which can be used for an at least partially electrically driven vehicle. The drive system 1 includes a multiphase electric machine 2 . The motor 2 is currently configured as six-phase. The electric machine 2 comprises a stator 3 having a first subsystem 4a and a second subsystem 4b. In this case, the first subsystem 4a is assigned the three phases Ph1a, Ph2a and Ph3a and the second subsystem 4b is assigned the three phases Ph1b, Ph2b and Ph3b. In this case, the phases Ph1a, Ph2a and Ph3a of the first subsystem 4a are connected to the first star point S1, while the phases Ph1b, Ph2b and Ph3b of the second subsystem 4b are connected to the second star point S2. Here, the star points S1 , S2 are separated from each other or not electrically connected. Furthermore, the electric machine 2 includes a rotor 5...

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Abstract

The invention relates to a method for controlling a multi-phase electric machine (2), wherein: a stator (3) of the electric machine (2) comprises a first sub-system (4a) and a second sub-system (4b) having the same number of phases (Ph1a, Ph2a, Ph3a, Ph1b, Ph2b, Ph3b) and separate star points (S1, S2); an inverter device (9) is controlled by means of space vector modulation in order to generate output voltages for each of the phases (Ph1a, Ph2a, Ph3a, Ph1b, Ph2b, Ph3b); the output voltages are output as pulse sequences (UPh1a, UPh1b); and each of the pulse sequences (UPh1a, UPh1b) in the second sub-system (4b) are output inverted with respect to the pulse sequences (UPh1a, UPh1b) in the first sub-system (4a).

Description

technical field [0001] The invention relates to a method for operating a multiphase electric machine, the stator of which has a first subsystem and a second subsystem, the first subsystem and the second subsystem have the same number of phases and have separate star points . In the method, the inverter arrangement is controlled by means of space vector modulation in order to generate the output voltage for the respective phase. In addition, the output voltage is output as a corresponding pulse train. Furthermore, the invention relates to a control device and a drive system. Finally the invention relates to computer programs. Background technique [0002] The electric motor is used as a drive motor in the vehicle. For this purpose, it is known from the prior art to use multiphase electric machines. Inverters are often used here in order to simulate polyphase AC systems. Here, the inverter can be operated using space vector modulation based on pulse width modulation. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06
CPCH02P27/06H02P2207/07H02P2207/076H02P23/00H02P27/08
Inventor D·格罗泽
Owner BAYERISCHE MOTOREN WERKE AG
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