Permanent Magnet Motors and Compressors

Abstract

The present invention proposes a permanent magnet motor and a compressor, wherein the permanent magnet motor includes: a motor stator, including a stator core; a motor rotor, which is sleeved in the stator core, and the end face of the rotor core is along the There are multiple sets of accommodation grooves in the circumferential direction, and a magnetic isolation barrier is provided at the end of the accommodation grooves close to the outer edge of the rotor core. The line between the axes of the d-axis forms the d-axis, and the magnetic isolation barriers on both sides of the d-axis extend along the circumferential direction to the d-axis respectively. The width of the magnetic isolation barrier in the radial direction is W1, and the width of the accommodation groove is W2. The minimum gap between the outer circle of the core and the inner circle of the stator core is W3, (1.5×W3)≤W1

Description

technical field [0001] The invention relates to the field of compressors, in particular to a permanent magnet motor and a compressor. Background technique [0002] In the manufacturing process of high-power compressors, due to the problems of excessive wire ends and thick wire diameters, it will bring difficulties to the manufacturing and affect the manufacturing efficiency of the motor. As a solution to this problem, the use of triangular windings The method can reduce the wire diameter and the number of parallel connections, thereby reducing the number of outgoing wires. However, if the delta connection method is used, the 3rd and 3rd multiple harmonics in the opposite potential will form a circulating current inside the delta winding, which will cause copper loss in the motor. The increase will affect the performance of the motor, and the circulation will lead to the increase of no-load torque and load torque fluctuation, which will affect the noise of the motor and the a...

AI Technical Summary

Problems solved by technology

[0004] (1) The q-axis magnetic circuit is blocked, resulting in a decrease in the overall torque density of the motor. For high-power motors, the current at the same torque will increase, so higher requirements are placed on the motor's current resistance requirements, and the overall cost will be lower. Rise, the cost performance will decrease, and the whole motor capacity will decrease accordingly;

[0005] (2) The cogging torque of the motor is increased, so it will affect the load torque ripple of the motor, thereby increasing the noise of the motor

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