Asymmetrical excitation stator alternate-angle dual-salient-pole motor and control method thereof

Abstract

The invention discloses an asymmetrical excitation stator alternate-angle dual-salient-pole motor and a control method thereof, and belongs to the technical field of direct-current motors. The motor comprises a motor revolving shaft, a magnetic conductive material, a central electric excitation coil, two groups of salient pole stators, two groups of salient pole rotors and a stator winding, wherein four salient pole teeth are distributed on the rotors; six salient pole teeth are distributed on the stators; a second group of salient pole stators is staggered away from a first group of salient pole stators by a mechanical angle of 30 degrees; the stator winding is partitioned into a phase A, a phase B and a phase C; and the phases A, phases B and phases C of the salient pole stators on two sides are arranged in a staggered way. The method comprises the following steps: selecting a powered-on winding according to positions of the rotors; rotating the motor after powering on; performing phase change when a rotor tooth center line is deviated from a stator tooth center line on one side by 40 degrees; performing phase change at a phase change angle of 30 degrees; and rotating the motor continuously. The two groups of salient pole stators being staggered away by a certain mechanical angle are based on a torque overlapping principle, and torques generated by windings on both sides are overlapped, so that the torque of an axial excitation dual-salient-pole motor is increased, and the torque pulsation is reduced.

Description

Technical field [0001] The invention belongs to the technical field of motors and their control, and in particular relates to an asymmetric excitation stator staggered double salient pole motor and a control method thereof. Background technique [0002] Torque ripple and loud noise are the two major factors that limit motor application. Torque pulsation means that in a commutation cycle of the motor, the difference between the maximum and minimum output torque is too large, which causes the motor to vibrate. When the motor is far away from the design point, the torque pulsation is more obvious, especially in electric vehicles and textiles. Such as industries that require high motor output torque. There are two main reasons for the torque ripple: one is that the special double salient pole structure of the motor determines that there must be greater torque ripple, especially when the stator and rotor are aligned. At this time, the reluctance is the smallest, the flux linkage is s...

AI Technical Summary

Problems solved by technology

There are two main reasons for the torque ripple: one is that the special double-salient pole structure of the motor determines that there must be a large torque ripple, especially at the position where the stator and rotor are aligned, where the reluctance is the smallest, the flux linkage is saturated, and the phase The torque output is the smallest; the second is that the motor is used in an operating environment that requires frequent switching of the power converter, that is, the complex voltage harmonic components other than the fundamental wave will be generated during frequent switching, which will also cause the pulsation of the motor

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