Method for reducing NVH of motor, and new energy automobile motor

Abstract

The invention discloses a method for reducing NVH of a motor, and a new energy automobile motor. The method comprises the following steps: step 1, heating a rotor iron core of the motor to a preset temperature; step 2, coating the excircle surface of the rotor iron core with an insulating paint; and step 3, drying the insulating paint on the rotor iron core to make the rotor iron core sheets firmly bonded, thereby reducing gaps among the rotor iron core sheets, improving the rigidity of the rotor iron core, and reducing the NVH of the motor. According to the invention, the outer circle surface of the rotor core is coated with a layer of the insulating paint, so that the rotor core sheets are firmly bonded, the rigidity of the rotor core is improved, the bending degree of the rotor when the motor generates resonance is reduced, the extra electromagnetic noise generated during resonance is reduced, the NVH of the motor is effectively reduced, the vibration and noise reduction effect can be achieved without additional hardware, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of automobile motors, and in particular relates to a method for reducing the NVH of a motor and a new energy automobile motor. Background technique [0002] Motor NVH refers to the noise, vibration and harshness (Noise, Vibration, Harshness) exhibited by the motor during operation, which mainly includes three sources, namely electromagnetic noise, mechanical noise and aerodynamic noise. Studies have shown that the electromagnetic noise of the motor is mainly caused by the fluctuation of the electromagnetic force of the motor, and the electromagnetic force is determined by the magnetic field built by the stator winding, the magnetic field built by the rotor, and the air gap permeance between the stator and the rotor. Among them, the size of the air gap between the stator and the rotor is the core factor affecting the size of the air gap permeance. [0003] At present, with the increasing maturity of the moto...

AI Technical Summary

Problems solved by technology

However, in the manufacture of motors, the rigidity of the rotor core is prone to be insufficient, resulting in serious deformation of the rotor in the first-order bending mode, and the phenomenon of rotor dynamic eccentricity

Rotor eccentricity means that the rotor axis does not coincide with the stator axis, and as the rotor rotates, the relative position of the rotor axis and the stator axis also rotates, which causes the air gap between the stator and rotor to be uneven and fluctuate over time

Fluctuations in air gap size will lead to fluctuations in air gap permeance, and fluctuations in air gap permeance will cause fluctuations in electromagnetic force, resulting in additional electromagnetic noise

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