Permanent magnet synchronous motor rotor assembly for vehicle, and design method thereof and motor

Abstract

The invention relates to the technical field of permanent magnet synchronous motors, particularly to a permanent magnet synchronous motor rotor assembly for a vehicle, and a design method thereof anda motor. The permanent magnet synchronous motor rotor assembly for the vehicle comprises a rotor shaft, a rotor iron core attached magnetic steel assembly and magnetism isolating fixing end plates, wherein the rotor iron core attached magnetic steel assembly comprises a permanent magnet, a rotor iron core and a counterweight pin, the rotor iron core is in key connection with the rotor shaft, a permanent magnet groove and a weight removing hole are formed in the rotor iron core, the permanent magnet is inserted into the permanent magnet groove, the counterweight pin is inserted into the weightremoving hole, the magnetism isolating fixing end plates are in key connection with the rotor shaft, and the two magnetism isolating fixing end plates are arranged at the two ends of the rotor iron core attached magnetic steel assembly respectively. According to the permanent magnet synchronous motor rotor assembly for the vehicle, the counterweight pin is arranged in the weight removing hole of the rotor core, so that a dynamic balance plate can be omitted, the weight of the magnetism isolating fixing end plate can be reduced, the thickness of the magnetism isolating fixing end plate can be reduced, the axial length of the rotor assembly can be shortened, and the weight and the cost of a product can be reduced.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motors, in particular to a permanent magnet synchronous motor rotor assembly for vehicles, a design method thereof and a motor. Background technique [0002] With the development of new energy vehicles, the electric drive system is developing towards high voltage, high speed, and miniaturization, so its structure is more compact and its cost requirements are higher. If the dynamic balance accuracy of the motor is low, vibration noise will be generated, which will cause coercive excitation to the support bearing and reduce the service life of the motor, especially for vehicle drive motors, which have higher requirements on NVH and reliability, so their dynamic balance accuracy level requirements are also higher . [0003] The traditional permanent magnet synchronous motor rotor assembly mainly includes iron core with magnetic steel assembly, rotor shaft, dynamic balance end pl...

AI Technical Summary

Problems solved by technology

If the dynamic balance accuracy of the motor is low, vibration noise will be generated, which will cause coercive excitation to the support bearing and reduce the service life of the motor, especially for vehicle drive motors, which have higher requirements on NVH and reliability, so their dynamic balance accuracy level requirements are also higher

[0003] The traditional permanent magnet synchronous motor rotor assembly mainly includes iron core with magnetic steel assembly, rotor shaft, dynamic balance end plate, etc., in which the dynamic balance accuracy level of the rotor assembly is achieved by removing weight on the dynamic balance plate, and the balance plate generally chooses Steel, aluminum, and some copper materials can be used as the basic material, which can play a certain role in magnetic isolation and fixed permanent magnets, but this solution will inevitably increase the axial length and increase the cost and weight of rotor assembly components

At the same time, traditional weight-increasing methods such as bonding balance mud, the balance mud is easy to fall off under high-speed and harsh impact conditions, welding nuts are prone to welding stress, and threaded connection counterweight methods have attenuation of torque and are prone to unreliable connections. Happening

Images