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Nine-state control strategy for three-phase electrically excited doubly salient pole motor

A doubly salient motor and control strategy technology, applied in the direction of electronically commutated motor control, torque ripple control, control system, etc., can solve the problems of different torque peaks of each phase, torque peaks, etc., to reduce torque The effect of eliminating pulsation, eliminating torque pulsation, and increasing the rate of change of current

Inactive Publication Date: 2017-04-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current on-off control strategy, for the sake of convenient operation, system simplification, and the difficulty of writing control programs, and based on the assumption that the motor structure is symmetrical, the three-phase on-off and off angles are all set to the same size , which will make the peak torque of each phase different, and a more obvious torque peak will appear

Method used

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  • Nine-state control strategy for three-phase electrically excited doubly salient pole motor
  • Nine-state control strategy for three-phase electrically excited doubly salient pole motor
  • Nine-state control strategy for three-phase electrically excited doubly salient pole motor

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings with an electric excitation doubly salient motor starting system.

[0024] The system block diagram of electric excitation doubly salient motor is as follows: figure 2 As shown, the main power circuit is a three-phase full-bridge circuit, and the neutral point is not drawn out. Compared with the three-phase half-bridge circuit, the volume is small, and the hardware structure is simple and reliable. In order to obtain the accurate rotor position of the motor, a position sensor is required, and the obtained corresponding rotor position signal P a ,P b ,P c The driving signal of the main power circuit is generated through the processing of the digital control circuit to control the operation of the motor.

[0025] Such as image 3 As shown, the six-state state control strategy divides six conduction intervals by the natural commutation points of opposite potentials in...

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Abstract

The invention provides a nine-state control strategy for a three-phase electro-magnetic doubly-salient motor. According to the nine-state control strategy, counter emf of the motor is fully utilized, the positive onset interval of each phase of the motor is prolonged, the electrical angles of the positive onset intervals of all phases exceed 120 degrees, nine working states are formed in one electrification period, the electric current change rate of a phase winding is increased when commutation of the motor is conducted, the up-down power tube dead-time is eliminated while the positive onset intervals of all the phases are prolonged, and a torque gap generated by excitation reluctance is offset through the generated phase torque; for the problem that the three-phase electromagnetic property of the electro-magnetic doubly-salient motor is not symmetrical, the positive onset intervals of all phases are optimized, so that the motor torque peak is restrained, the motor torque valley value is increased, and the torque pulses are reduced.

Description

technical field [0001] The invention relates to a starting system for a three-phase electric excitation double salient pole motor, which belongs to the technical field of special motors and motor control. Background technique [0002] Three-phase electrically excited double salient pole motor (hereinafter referred to as double salient pole motor) has a simple and reliable structure, high power density and flexible control, and is suitable for use in high-demand fields such as aerospace. When a doubly salient motor operates as a motor, its control system is similar to that of a brushless DC motor. Compared with other types of motors, doubly salient motors have a larger torque-to-current ratio, but due to their own structural characteristics, their torque ripple rate is also larger than other types of motors, resulting in loud noise, severe vibration, and Problems such as large speed fluctuations limit its application range to a certain extent. [0003] At present, the main ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/10
CPCH02P6/10H02P6/182
Inventor 刘伟峰王慧贞赵耀牛先智王逸洲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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