Magnetic steel built-in rotor and permanent magnet synchronous motor comprising magnetic steel built-in rotor

Abstract

The invention discloses a magnetic steel built-in rotor, comprising an iron core, wherein a peripheral surface of the iron core is a cylindrical surface; a plurality of magnetic steel slots are set inthe iron core at intervals along a circumference direction; the magnetic steel slots are connected in an axial direction; magnetic steel is set in each magnetic steel slot; the magnetic steel is S-pole magnetic steel or N-pole magnetic steel; the S-pole magnetic steel and the N-pole magnetic steel are arranged along the circumference direction of the iron core at intervals in an stagger arrangement mode; and two spaced through holes are set at outer sides of each magnetic steel slot in the iron core. The invention also discloses a permanent magnet synchronous motor comprising the magnetic steel built-in rotor. According to the magnetic steel built-in rotor and the permanent magnet synchronous motor, the harmonic content of the counter electromotive force of the permanent magnet synchronous motor is effectively reduced and the sinusoidal degree of a counter electromotive force waveform is improved, so the difficulty of controlling the motor by a motor controller is reduced, the motor control precision is improved, moreover, the cogging torque resulting from stator slotting and the rotor is also effectively reduced, the motor operation noise is reduced, and the comfort of a new energy automobile is improved.

Description

technical field [0001] The invention relates to the technical field of drive motors for new energy vehicles, in particular to a rotor with a built-in magnet and a permanent magnet synchronous motor including the rotor with a built-in magnet. Background technique [0002] Because permanent magnet synchronous motors have the advantages of small size, light weight, high torque power density, high efficiency, and good speed regulation characteristics, existing new energy vehicle drive motors generally use permanent magnet synchronous motors. [0003] see figure 1 , the permanent magnet synchronous motor used for driving motors of new energy vehicles includes a rotor 10 and a stator 20 arranged on the outer side of the rotor 10, see figure 2 and combine figure 1 , the rotor 10 is an iron core, and the rotor 10 is evenly spaced along the circumferential direction to be provided with eight axially penetrating magnetic steel slots 11, and each magnetic steel slot 11 is provided w...

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is: for existing permanent magnet synchronous motors, there are many counter electromotive force harmonics, poor sine degree of counter electromotive force waveform, poor control accuracy, large cogging torque, and high operating noise and other problems, and provide a permanent magnet synchronous motor that effectively reduces the harmonic content of the back electromotive force of the permanent magnet synchronous motor, improves the sine degree of the back electromotive force waveform, improves the control accuracy of the motor, reduces the cogging torque, and reduces the operating noise of the motor. Magnetic steel built-in rotor

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