Electromagnetic vibration control method for wheel hub side of electric car driven by wheel hub motor
A technology for in-wheel motors and electric vehicles, applied in electronic commutation motor control, motor control, motor-generator control and other directions, can solve the problems of in-wheel motor electromagnetic torque pulsation, electromagnetic torque affecting the tangential direction, and small physical deformation of bearings, etc. Achieve the effect of improving smoothness, uniform distribution, and reducing torque ripple
Active Publication Date: 2016-04-13
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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[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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[0031] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0032] like Figure 1 to Figure 4 As shown, a hub motor electromagnetic damping device for an electric vehicle includes a vehicle power supply 1, a signal acquisition circuit 2a, a core control unit 2b, a drive circuit 2c and a hub motor 3, and the hub motor 3 includes an outer rotor 31, an inner stator 33, Bearing 34, motor shaft 35 and end cover 36, the inner stator 33 is arranged on the inner circumference of the outer rotor 31, the end cover 36 is fixedly connected with the outer rotor 31, the inner stator 33 is fixedly connected with the motor shaft 35, and the end cover 36 is provided with a bearing 34 , the motor shaft 35 is connected with the bearing 34. The inner peripheral surface of the outer rotor 31 is provided with a permanent magnet 31a. There is an air gap 32 between the outer peripheral surfaces of 33. When the...
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The invention discloses an electromagnetic vibration control method for the wheel hub side of an electric car driven by a wheel hub motor. The electromagnetic vibration control method comprises the following steps: (S1) electric signal collection, namely transmitting the collected electric signal to a core control unit by a signal collection circuit, and calculating a magnetic field linkage signal of a wheel hub motor by the core control unit according to the electric signal; (S2) FFT analysis, namely analyzing the motor flux by a fast fourier transform (FFT) method; (S3) double closed loop control, with a zero amplitude as an input quantity and the amplitude calibrated in the step (S2) as an outer closed loop control signal in an outer closed loop control, calculating an expected compensation current value of a compensation winding by the core control unit, with the expected compensation current value as the input quantity and collected real-time current, collected by the signal collection circuit, of the compensation winding as an inner closed loop control signal in an inner closed loop control, outputting a PWM drive signal to a drive bridge by the core control unit; and (S4) magnetic field compensation and vibration removal, namely exciting a compensation magnetic field by the compensation winding after obtaining the compensation current, and removing the electromagnetic torque pulsation phenomenon of the wheel hub motor.
Description
technical field [0001] The invention relates to an electric vehicle, in particular to an electromagnetic damping control method on the hub side of the electric vehicle driven by a hub motor. 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 spru...
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IPC IPC(8): H02P21/05
CPCH02P21/05H02P2205/01
Inventor 王子辉张震宇
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY