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Polyphase motor driver control method

A multi-phase motor and control method technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of complex engineering implementation, inability to effectively eliminate the influence of common mode voltage, and large calculation amount of space vector modulation method. The effect of eliminating common mode voltages

Active Publication Date: 2018-05-08
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The space vector modulation method has a large amount of calculation, and the engineering implementation is relatively complicated
The carrier modulation method is simple to implement, but there are certain problems in the existing control methods, such as the inability to effectively eliminate the influence of common-mode voltage

Method used

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Embodiment Construction

[0024] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0025] A kind of multi-phase motor driver control method of the present invention, the content of this method is as follows:

[0026] The multi-phase motor driver is composed of 2n-phase inverters, where n is a natural number, such as figure 1 As shown, among them, the first phase bridge arm and the second phase bridge arm are controlled by the first module 1, the third phase bridge arm and the fourth phase bridge arm are controlled by the second module, ..., and so on, the 2n-1th The phase bridge arm and the 2nth phase bridge arm are controlled by the nth module.

[0027] When selecting n=3 below, specify the control method of the present invention, as figure 2 As shown, the implementation steps of the control method are as follows:

[0028] In the control of the first module, the first modulation wave is subtracted from the second modulati...

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Abstract

The present invention provides a polyphase motor driver control method. The method comprises the steps that: a polyphase motor driver is formed by 2n-phase inverters, and n is a natural number, wherein a first-phase bridge arm and a second-phase bridge arm are controlled by a first module; a third-phase bridge arm and a fourth-phase bridge arm are controlled by a second module; a (2n-1)th-phase bridge arm and a 2nth-phase bridge arm are controlled by an nth module, and so on; in the control of the first module, a first modulation wave subtracts a second modulation wave, a difference of the first modulation wave and the second modulation wave is compared to a carrier wave to generate control signals of the first module; if the difference of the first modulation wave and the second modulation wave is larger than the first carrier wave 1, a first-phase bridge arm upper switch is conducted with a second-phase bridge arm lower switch, if a first-phase bridge arm current is smaller than 0, the first-phase bridge arm upper switch is switched off, and the second-phase bridge arm lower switch is only switched on; and if a second-phase bridge arm current is larger than 0, the second-phase bridge arm lower switch is switched off, and the first-phase bridge arm upper switch is switched on. Simple modulation wave operation and carrier wave comparison are employed to generate control signalsto eliminate a system common mode voltage.

Description

technical field [0001] The invention relates to the field of motor drivers, in particular to a control method for multi-phase motor drivers. Background technique [0002] The traditional three-phase motor drive system has been widely used at present, and the technology is relatively mature, but there are some disadvantages. With the development of power electronics technology, the motor drive system is no longer limited by the number of power supply phases, and the control of multi-phase motors and their drivers has become a research hotspot. Compared with the traditional three-phase motor drive system, the multi-phase motor drive system has more degrees of control freedom, good torque control performance and fault tolerance performance, etc., in the fields of electric vehicles, military ships, rail transit and aerospace It has advantages and broad application prospects. [0003] In practical applications, there are two control methods for multiphase motor drivers, one is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/06H02M7/537
CPCH02M7/537H02P27/06H02M1/123
Inventor 郭小强
Owner YANSHAN UNIV
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