Built-in permanent magnet driving motor of electric automobile and electromagnetic vibration weakening method thereof

Abstract

The invention provides a built-in permanent magnet driving motor of an electric automobile and an electromagnetic vibration weakening method thereof. The built-in permanent magnet driving motor comprises a permanent magnet rotor which is disposed in a stator in a sleeving manner and is coaxially arranged with the stator, and an armature winding is arranged on the stator; the permanent magnet rotorcomprises a rotor core and permanent magnets, a rotor groove is formed in the rotor iron core, a permanent magnet is placed in the rotor groove, 2p rotor magnetic poles are formed on the rotor iron core by the permanent magnet, the pole arc width corresponding to one rotor magnetic pole in the rotor magnetic poles is different from the pole arc widths corresponding to other 2p-1 rotor magnetic poles, and the pole arc widths of the other 2p-1 rotor magnetic poles are the same; and magnetic flux on the permanent magnet rotor enters the stator along an air gap between the stator and the permanent magnet rotor, formed main magnetic flux acts with a magnetic field generated by an armature winding on the stator, and the motor generates torque. Through the novel rotor magnetic pole segmentationmethod, the cogging torque, the tooth harmonic electromotive force and the torque pulsation of the built-in permanent magnet motor can be greatly weakened, so that the electromagnetic vibration of thebuilt-in permanent magnet motor is effectively weakened.

Description

technical field [0001] The disclosure belongs to the technical field of electromagnetic vibration weakening, and relates to an electric vehicle built-in permanent magnet drive motor and an electromagnetic vibration weakening method thereof. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] In recent years, with the improvement of high temperature resistance and price reduction of permanent magnet materials, permanent magnet motors have been widely used in national defense, industry, agriculture and daily life, and are moving towards high power, high functionality and miniaturization. With the development, the varieties and application fields of permanent magnet motors continue to expand. At present, the power of permanent magnet motors ranges from a few milliwatts to thousands of kilowatts, and the application scope ranges from small toy m...

AI Technical Summary

Problems solved by technology

[0008] However, the interior permanent magnet motor also has the common disadvantage of permanent magnet motors, that is, it has cogging torque

The existence of cogging torque will increase the torque ripple of the permanent magnet motor, bring additional electromagnetic vibration to the motor, increase the efficiency loss of the transmission system, and cause mechanical fatigue loss, which is not conducive to the safe and reliable operation of electric vehicles. Torque ripple can also cause electromagnetic noise in the motor

[0009] At present, the method of stator skew or rotor skew is mainly used in industry to weaken the cogging torque, torque ripple and electromagnetic vibration of permanent magnet motors, but the way of skew or skew increases the difficulty and cost of industrial manufacturing. It is difficult to achieve when the axial length of the motor is short, so a low-cost and versatile solution to suppress the torque ripple and electromagnetic vibration of the interior permanent magnet motor under the condition of non-inclined chute is required

Images