A control method for electrically excited doubly salient motors suitable for hybrid electric vehicles

Abstract

The invention discloses a control method applicable to a doubly salient electro-magnetic motor. According to the method, a three-phase twelve-beat control strategy is provided for switching-on and switching-off of a power converter main switch tube based on inductance characteristics of the doubly salient electro-magnetic motor in operation. In the premise of ensuring reliable operation of the motor, in order to inhibit torque pulsation and improve output torque, an electrical cycle is divided into twelve stages, each stage is corresponding to a switching-on mode of the switch tube for controlling a current in the corresponding direction to flow into the corresponding phase, so that the motor forms twelve working conditions in the electrical cycle. According to the motor provided by the invention, the torque pulsation caused by the condition of adding a dead time (namely the time when an upper switch tube and a lower switch tube are simultaneously switched off) into a commutation time is avoided, an effective section of the inductance can be fully utilized to introduce the current in the corresponding direction, and thus the output torque is improved to a certain extent.

Description

technical field [0001] The invention relates to a control strategy for an electrically excited double-saliency motor suitable for a hybrid electric vehicle, and belongs to the technical field of motor control. Background technique [0002] Electric excitation doubly salient motor is developed on the basis of permanent magnet doubly salient motor. The motor replaces the stator magnetic steel of the permanent magnet doubly salient pole motor with the excitation winding, which is easy to realize the field weakening control in the motoring process. This kind of motor has simple structure, low cost, high reliability and good fault tolerance, and has broad application prospects in hybrid electric vehicles, aviation and other fields. However, similar to switched reluctance motors and permanent magnet double salient pole motors, electrically excited double salient pole motors also have relatively obvious torque ripples during operation, resulting in problems such as high rotational...

AI Technical Summary

Problems solved by technology

The three-phase three-beat standard angle control strategy is simple to implement, but the effect is not good, the motor output power is low, and the torque ripple is large; the three-phase three-beat advance angle control strategy improves the performance of the motor, but the addition of dead time, There is still a large torque ripple; the three-phase six-beat control strategy further improves the performance of the motor, and the torque ripple is correspondingly reduced, but the effective range of the inductance cannot be fully utilized, and it is difficult to give full play to the torque output capability; the three-phase The nine-beat control strategy makes full use of the effective area of ​​inductance change, so that the electrically excited double salient pole motor can obtain a higher output torque, but it still needs to add dead time, so the torque ripple suppression is not obvious

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