Motor rotor and permanent magnet motor

Abstract

The invention provides a motor rotor and a permanent magnet motor. The motor rotor comprises a rotor core (1), wherein a plurality of permanent magnet grooves (2) are formed in the rotor core (1) along the circumferential direction; each permanent magnet groove (2) is internally provided with a permanent magnet (3); a magnetism isolating groove (4) is formed in the inner side of each permanent magnet groove (2); magnetism isolating holes (5) are formed between every two adjacent magnetism isolating grooves (4) at intervals; in the direction along the central axis, close to the rotor core (1),of the radial direction, the widths of the magnetism isolating grooves (4) and the widths of the magnetism isolating holes (5) are changed in a stepped form, and the magnetism isolating grooves (4) and the magnetism isolating holes (5) are mutually engaged and arranged; and stepped magnetism isolating bridges (6) are formed between the magnetism isolating grooves (4) and the magnetism isolating holes (5). According to the motor rotor provided by the invention, the magnetism isolating effect can be improved effectively, the leakage flux on the inner side of the motor rotor is reduced, the magnetizing saturation degree of the motor rotor is promoted, and the motor performance is promoted.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a motor rotor and a permanent magnet motor. Background technique [0002] The motor with permanent magnet tangential magnetization structure can produce higher air gap flux density than permanent magnet radial magnetization motor due to its "magnetic concentration" effect, so that the motor has a larger torque / current ratio and torque / volume ratio , are increasingly being used in servo systems, electric traction, office automation, household appliances and other occasions. [0003] In the tangential permanent magnet motor of the prior art, since the rotor permanent magnets are radially arranged, a part of the permanent magnets is deeply buried inside the rotor, and an external magnetic field is applied to the rotor. When the rotor permanent magnets are magnetized, the inner side of the permanent magnets conducts magnetism The passage makes it difficult for the magneti...

AI Technical Summary

Problems solved by technology

[0003] In the tangential permanent magnet motor of the prior art, since the permanent magnets of the rotor are radially arranged, a part of the permanent magnets is deeply buried inside the rotor, an external magnetic field is applied to the rotor, and when the permanent magnets of the rotor are magnetized, the inner side of the permanent magnets will The passage makes it difficult for the magnetizing magnetic field to enter the part of the rotor close to the rotating shaft, and the part of the permanent magnet near the rotating shaft cannot be magnetized to reach saturation, which will easily lead to a decrease in motor performance, or even loss of magnetization of the permanent magnet, and the motor cannot run

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