A Permanent Magnet Assisted Synchronous Reluctance Motor Rotor for High Speed ​​Applications

Abstract

The invention discloses a permanent magnet assisted synchronous reluctance motor rotor which can be used in high-speed occasions. The permanent magnet assisted synchronous reluctance motor rotor includes a rotor core, a magnetic barrier distributed on the rotor core, and a magnetic barrier arranged in the magnetic barrier. Steel; four layers of boat-shaped magnetic barriers are distributed under each pole of the rotor core, and each layer of magnetic barriers is connected and closed by a straight line part in the middle and perpendicular to the d-axis and an oblique straight line part at both ends and at an angle α to the d-axis made. The invention optimizes the design of the motor rotor, so that the motor has the characteristics of high efficiency, high torque density, high power factor, strong anti-demagnetization ability and convenient manufacture.

Description

technical field [0001] The invention relates to the technical field of synchronous motors, in particular to a permanent magnet assisted synchronous reluctance motor rotor. Background technique [0002] The synchronous reluctance motor relies entirely on the reluctance difference of the dq axis magnetic circuit to generate torque. Because there is no guide bar on the rotor, there is no electromagnetic loss, and it has higher efficiency and lower stable operating temperature than induction motors. Through the optimal design of the magnetic barrier of the synchronous reluctance motor rotor, the reluctance torque is maximized, and the torque density can be better than that of the induction motor. At present, the problem that restricts the wide application of synchronous reluctance motors is mainly the low power factor, which needs to be driven with a large-capacity inverter. The permanent magnet assisted synchronous reluctance motor can effectively improve the power factor by ...

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Problems solved by technology

[0004] Publication Nos. CN104038011A and CN104052227A disclose two kinds of permanent magnet assisted synchronous reluctance motors in the open specifications of Chinese patents. Similarly, the magnet steel adopts the rare earth NdFeB permanent magnet material with high remanence Br, and the amount of magnet steel is large. There are many specifications, except that the magnetic steel in the first layer of magnetic barrier can effectively output a certain amount of magnetic energy when facing the air gap, and the utilization rate of the magnetic energy of the other magnetic steel is low

Compared with the general IPM motor, this structure only slightly increases the limited torque density, but greatly increases the cost of the motor, and the economy is poor, so it is not suitable for mass production

[0005] Publication Nos. CN102761222A and CN102790457A disclose two kinds of permanent magnet assisted synchronous reluctance motors in the open specifications of the Chinese patents. Inexpensive ferrite magnets are embedded in the magnetic barrier. Because the ferrite permanent magnet material is hard and brittle, Electric processing cannot be performed, and only slicing and a small amount of grinding can be performed, so the production process of arc-shaped ferrite magnets is cumbersome and the processing cost is high; meanwhile, ferrite magnets have a large span and are easily broken; The barrier lacks a magnetic bridge to reduce the edge stress of the rotor during high-speed rotation, and there may be a danger of the edge of the rotor being broken, which is not suitable for high-speed working conditions

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