Consequent-pole motor and compressor with same

Abstract

The invention discloses a consequent-pole motor and a compressor with the same. The consequent-pole motor comprises a rotor; the rotor is prepared from a soft magnetic material; one slot groups or more are arranged on the rotor; each slot group is provided with three layers of slots in a radial direction; the slots are divided into first-layer slots, second-layer slots and third-layer slots from the peripheral edge of the rotor to the axle hole of the rotor; permanent magnets are mounted on two layers of slots of each slot group; polarities of the permanent magnets, which face the outer peripheral edge of the rotor, are the same polarities. The motor designed by the invention adopts a multi-layer slot structure, but the permanent magnets are not mounted in all of the slots, so that an inductance Lq of a q axis of the motor can be obviously improved, a difference value of Lq and Ld is increased, an electromagnetic torque of the motor is improved, demagnetization resistance of the rotoris obviously improved, and torque fluctuation is weakened.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to an alternating pole motor and a compressor having the same. Background technique [0002] A traditional permanent magnet motor, such as an 8-pole permanent magnet motor, has 8 permanent magnets arranged around the center of the rotor along the direction of rotation, and adjacent permanent magnets have different magnetization directions. The alternating pole permanent magnet synchronous motor has only 4 permanent magnets, which are also uniformly distributed along the circumference, and the adjacent permanent magnets have the same length in the magnetization direction. Those with permanent magnet installation slots are called permanent magnet poles. Two permanent magnets are installed The soft magnetic material between the slots is magnetized by the permanent magnet poles to have the opposite polarity to the permanent magnet poles, so it is called an alternating pole permanent magn...

AI Technical Summary

Problems solved by technology

Therefore, on the one hand, the reluctance of the d-axis magnetic circuit of the alternating pole motor is small, and the inductance of the d-axis is large, resulting in a small difference in inductance between the q-axis and the d-axis, resulting in a small reluctance torque, which limits the increase in electromagnetic torque

On the other hand, due to the thinner equivalent thickness of the permanent magnet, the anti-demagnetization ability drops more obviously

[0006] In addition, due to the asymmetry of adjacent magnetic poles of alternating pole motors, large torque fluctuations are formed during operation

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