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Overmodulation method of permanent magnet synchronous motor

A permanent magnet synchronous motor and overmodulation technology, which is applied in the direction of converting irreversible DC power input into AC power output, and can solve the problems of increased relative error, low control accuracy of power semiconductor devices in the main circuit, and power loss of semiconductor switching devices Increase and other issues

Inactive Publication Date: 2012-10-10
CHONGQING CHANGAN AUTOMOBILE CO LTD +1
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Problems solved by technology

However, when the reference voltage is At this time, since the inverter will work in the six-step ladder wave mode, that is, enter the square wave working condition, if the method of reducing the action time of the basic voltage vector according to the ratio is still adopted, the difference between the output voltage and the reference voltage vector will be The relative error increases, the control accuracy of the main circuit power semiconductor device is not high, and the power loss of the semiconductor switching device increases

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  • Overmodulation method of permanent magnet synchronous motor
  • Overmodulation method of permanent magnet synchronous motor
  • Overmodulation method of permanent magnet synchronous motor

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[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0040] The embodiment of the present invention discloses an overmodulation method for a permanent magnet synchronous motor, so as to realize a simple modulation algorithm, reduce the relative error between the output voltage and the reference voltage vector, improve the control accuracy of the power semiconductor device of the main circuit, and reduce the loss of the semiconductor switching device. Power loss.

[0041] Such as figure 1 As shown, a pe...

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Abstract

The invention discloses an overmodulation method of a permanent magnet synchronous motor. The overmodulation method includes dividing a modulation area into five areas, conducting overmodulation on a first fundamental voltage vector and pulse width modulation period in a fourth modulation area and conducting overmodulation on a second fundamental voltage vector and pulse width modulation period in a fifth modulation area. The overmodulation method is simple in modulation algorithm, reduces relative error of output voltage and reference voltage vector, improves control accuracy of a main return circuit power semiconductor device and reduces power consumption of a semiconductor switch device.

Description

technical field [0001] The invention relates to the technical field of motor control, and more specifically, to an overmodulation method for a permanent magnet synchronous motor. Background technique [0002] At present, for the pure electric vehicle drive system, the embedded permanent magnet synchronous motor system is generally used, and in order to improve the utilization rate of the DC bus voltage, the overmodulation method generally adopted is the space vector pulse width modulation (SVPWM) method, through the space vector The pulse width modulation (SVPWM) method generates modulated waves to power the permanent magnet synchronous motor. [0003] The space vector pulse width modulation (SVPWM) method is based on the input reference voltage vector and the current DC bus voltage to adjust the width of the pulse signal that controls the on-off of the main circuit power semiconductor device, so that the fundamental voltage output by the main circuit is equal to the input r...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 张辉
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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