Motor for electromobile

Abstract

The invention relates to a motor for an electromobile. An opening slot of the motor for the electromobile is provided of a magnetic structure, and the reluctancy Kr of the magnetic structure ranges from 0.7 to 0.8. The reluctancy Kr, which is equal to one, of a conventional PWM square wave brushless direct current motor is changed to range from 0.7 to 0.8, the motor is easily controlled in a field weakening control mode, the d axis and the q axis of the motor are coincident with the N axis and the S axis of a coordinate system, right angles are formed at any time when the magnetic lines are cut by a coil winding, the output torque is maximum, Hall starting is truly avoided, and the starting noise of the motor is reduced. It is thus clear that the motor for the electromobile can be controlled in a field weakening mode, the torque of the motor is maximum, and the noise of the motor is small.

Description

technical field [0001] The invention relates to the technical field of new environment-friendly electric vehicles, in particular to a motor for electric vehicles. Background technique [0002] Existing electric vehicles generally use PWM to design square-wave DC brushless motors, use PWM frequency to control the switching frequency of the three-phase bridge, and use duty cycle to control the effective current flowing through the motor windings to control the motor speed. Now, with the maturity and application of neuron control technology in control technology, back electromotive force sampling control technology in Hallless, fuzzy control technology and other technologies, hardware control chips such as 16-bit and 32-bit chips are widely used, and the calculation speed is getting faster and faster. Faster and faster, the vector SVPWM and its control technology are becoming more and more mature. However, the existing PWM square-wave motor design can no longer meet the existi...

AI Technical Summary

Problems solved by technology

However, the existing PWM square-wave motor design can no longer meet the existing control technology. The electric vehicle controlled by a square-wave DC brushless motor designed with PWM will have a magnetic circuit rich in magnetism. The amount of rare earth permanent magnets is relatively large, and the cost accounts for about 100% of the entire motor. about 1 / 4 of

At the same time, after the control unit is matched with the motor, the noise of the motor is relatively large, and the torque ripple of the motor is still obvious. After the vehicle is assembled, the riding comfort is far below people's expectations, and it is only a means of transportation that meets people's travel. Existing PWM motor design is imminent

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