Permanent magnet motor and compressor with permanent magnet motor

Abstract

The invention discloses a permanent magnet motor and a compressor with the permanent magnet motor. The permanent magnet motor comprises a stator and a rotor; the stator comprises a stator core and a stator winding; the stator core forms a ring and a plurality of stator teeth are arranged on the inner ring, stator slots are defined between adjacent stator teeth, and the stator winding is wound in the stator slots; the rotor is rotatably arranged at the inner side of the stator; the rotor comprises a rotor core and a permanent magnet; a mounting groove is arranged on the rotor core, wherein the mounting groove penetrates through the rotor core along the axial direction, and the permanent magnet is arranged in the mounting groove; the permanent magnet motor satisfies the following formula: W2 is not less than 0.25*W3* [Q / (2*p)] and less than W1, wherein W1 and W2 are respectively a maximum width and a minimum width of a working surface of the permanent magnet in a direction vertical to the axial direction of the rotor core, W3 is a pole body width of the stator teeth, Q is the quantity of the stator slots, and p is the number of pole pairs of the permanent magnet motor. According to the permanent magnet motor provided by the invention, the magnetic saturation degree of shoulders of the stator teeth can be reduced, the dosage of magnets can be reduced, and the cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of refrigeration equipment, in particular to a permanent magnet motor and a compressor with the permanent magnet motor. Background technique [0002] In the compressor industry, the cost of permanent magnets accounts for a large proportion of the cost of permanent magnet motors. However, the demagnetization rate at the four corners of the permanent magnet is relatively high, resulting in a low utilization rate of the permanent magnet, thereby reducing the cost performance of the motor. [0003] In related technologies, cutting off the four corners of the permanent magnet and using a magnet with relatively large residual magnetism can reduce the demagnetization rate of the permanent magnet to a certain extent, improve the utilization rate of the permanent magnet, and thereby improve the cost performance of the motor. However, this technology will bring process problems such as increased difficulty in magnet ...

AI Technical Summary

Problems solved by technology

However, this technology will bring process problems such as increased difficulty in magnet manufacturing

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