Electromagnetic damping device for wheel hub motor of electric automobile

Abstract

The invention discloses an electromagnetic damping device for a wheel hub motor of an electric automobile. The electromagnetic damping device comprises the wheel hub motor, a signal acquisition circuit, a core control unit and a driving circuit, wherein the wheel hub motor is provided with an inner stator; a compensating winding is arranged on the inner stator; the driving circuit is provided with a driving bridge arm; the driving bridge arm is electrically connected with the compensating winding; the signal acquisition circuit and the driving circuit are connected with the core control unit respectively; the signal acquisition circuit is used for acquiring a voltage and a current of the wheel hub motor and a current of the compensating winding, and transmitting an acquisition signal to the core control unit; the core control unit is used for outputting a pulse width modulation (PWM) driving signal to the driving bridge arm according to the received acquisition signal in order to perform closed-loop control on the current of the compensating winding; and the compensating winding generates a compensating magnetic field which is superimposed with a magnetic field of the wheel hub motor. Through adoption of the electromagnetic damping device, the phenomenon of electromagnetic torque pulsation of the wheel hub motor can be eliminated. Serving as a supplementary device of a conventional suspension damper, the electromagnetic damping device can further improve the vertical characteristic of the electric automobile.

Description

technical field [0001] The invention relates to an electric vehicle, in particular to an electromagnetic damping device for a hub motor of the electric vehicle. Background technique [0002] The hub motor is a motor in the form of an inner stator and an outer rotor. Its power, transmission and braking devices are integrated in the hub, so the mechanical components of the electric vehicle are greatly simplified. Compared with the traditional centralized drive form, the independent wheel The wheel hub drive form has unique performance advantages, such as good maneuverability, simplified transmission mechanism, extremely high transmission efficiency, high utilization rate of internal space of the body and good dynamic performance, etc. [0003] However, due to the rigid connection between the hub motor and the wheel of the conventional wheel drive electric vehicle, its mass constitutes the unsprung mass of the vehicle, so that the ratio of the sprung mass to the unsprung mass o...

AI Technical Summary

Problems solved by technology

[0005] However, after the shock absorbing measures are taken on the suspension side of the frame, although the ride comfort and the stability of the vehicle body are improved, when the vertical load of the vehicle body weight is applied to the bearing, the deformation of the bearing will cause the in-wheel motor The eccentricity of the inner stator and the outer rotor distorts the air-gap magnetic field in the vertical direction. Due to the strong rigidity of the bearing, the physical deformation of the bearing is very small, and the mechanical vibration caused by eccentricity can be ignored, but the magnetic field has a great impact on the space between the stator and rotor. The air gap distance is more sensitive, and a smaller eccentricity will cause a larger flux density change, causing the hub motor to produce electromagnetic torque pulsation, thus affecting the electromagnetic torque in the tangential direction

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