Self-skewed pole permanent magnet motor rotor punching sheet and permanent magnet motor

Abstract

The invention discloses a self-skewed pole permanent magnet motor rotor punching sheet, and the punching sheet comprises a rotor punching sheet body; the rotor punching sheet body is divided into a plurality of pairs of magnetic poles, and the magnetic poles are distributed in a circumferential array; lightening holes, connecting holes and magnetic steel grooves are circumferentially formed in the rotor punching sheet body, and each magnetic pole is matched with a group of magnetic steel grooves. the punching sheet is characterized in that each group of magnetic steel grooves comprises two bevel edge magnetic steel grooves, the two bevel edge magnetic steel grooves are arranged on two sides of the center line of the magnetic pole, and each of the two bevel edge magnetic steel grooves is composed of n / 2 rectangular magnetic steel grooves with the length of a and the width of b, and n is an even number greater than or equal to 4; every two adjacent rectangular magnetic steel grooves are communicated with each other and are arranged in a parallel step shape. According to the invention, the rectangular magnetic steel grooves are distributed in parallel in a stepped manner, and the magnetic steel blocks with the same size are inserted into the magnetic steel grooves, so equivalent skewed poles of the rotor can be realized, and noise vibration requirements of an automobile driving system are met; meanwhile, the communication design of the magnetic steel grooves can effectively reduce the eddy current loss of the magnetic steel and reduce the temperature rise of the magnetic steel.

Description

technical field [0001] The invention relates to the technical field of drive motors, in particular to a self-slanted permanent magnet motor rotor punch and a permanent magnet motor. Background technique [0002] The stator and rotor punches of the motor are punched out by a set of molds at the same time, that is, one stator punch matches one rotor punch. However, in the subsequent manufacture of the motor, it is necessary to displace the rotor core by segment, which increases the complexity of the process and the labor cost. [0003] Patent CN108599421A proposes an inline structure arranged at intervals along the circumferential direction, which can make the magnetic poles tilt at a certain angle. However, this structure has the following problems. First, in the case of ensuring the strength of the rotor sheet, due to the wide magnetic isolation bridge between some magnetic steel and the outer circle of the rotor, the torque will be lost more, and the utilization rate of th...

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Problems solved by technology

However, this structure has the following problems. First, in the case of ensuring the strength of the rotor sheet, due to the wide magnetic isolation bridge between some magnetic steel and the outer circle of the rotor, the torque will be lost more, and the utilization rate of the magnetic steel is not high; the second is that There are grooves on the outer circle of the rotor punch, which will increase the friction loss of the motor rotor and increase the temperature rise of the rotor

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