An electric vehicle and its motor harmonic suppression system

Abstract

The embodiment of the invention discloses an electric vehicle and a motor harmonic suppression system thereof. The system comprises a harmonic detection circuit and a compensating current generation circuit, wherein the harmonic detection circuit is connected with a load motor and is used for detecting a harmonic wave in a current of an input end of the load motor and calculating to obtain a current instruction value which needs to be compensated to the load motor; and the compensating current generation circuit is connected with the harmonic detection circuit and the load motor and is used for generating a compensating current with a difference of 180 degrees from a phase equal to an amplitude of the detected harmonic value according to the current instruction value so as to carry out compensation on the load motor. The current instruction value required by operation of the load motor is detected by the harmonic detection circuit, and the compensating current with the difference of 180 degrees from the phase equal to the amplitude of the harmonic value is generated by the compensating current generation circuit to carry out compensation on each time of harmonic current so as to achieve a harmonic suppression effect, thereby improving performance of the motor.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an electric vehicle and its motor harmonic suppression system. Background technique [0002] With the rapid development of electric vehicles, permanent magnet synchronous motors have been widely used. Due to the increasing number of electronic control devices and excitation devices, as well as the cogging effect of the motor, the nonlinearity of the motor magnetic circuit, the shape of the magnetic poles and the distribution of the windings, etc. And other reasons, so that the back EMF of the motor is not a sine wave, resulting in the current of the motor is not a sine wave, but contains harmonics. Harmonic current will increase the additional loss of stator winding, rotor circuit and iron core, cause local overheating of the motor, increase vibration and noise, increase temperature rise, accelerate insulation aging, shorten the service life of motor equipment, cause torque p...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an electric vehicle and its motor harmonic suppression system, which can solve the problem of the influence of harmonics in the system on the motor, thereby improving the performance of the motor

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