Magnetic steel rotor and permanent magnet synchronous motor
A technology for permanent magnet synchronous motors and rotors, applied to synchronous machine parts, motors, magnetic circuit rotating parts, etc., can solve the problems of high processing costs, reduce processing costs, weaken the salient pole effect, and change the harmonic content small effect
Pending Publication Date: 2017-04-26
UNITED AUTOMOTIVE ELECTRONICS SYST
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[0014] The purpose of the present invention is to provide a magnetic steel rotor and a permanent magnet synchronous motor to solve the problem of high processing costs in the prior art when reducing the no-load back emf harmonics and torque fluctuations of the permanent magnet synchronous motor
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[0044] In order to make the objects, advantages and features of the present invention clearer, the following are combined with the appendix Figure 4-9 The magnetic steel rotor and the permanent magnet synchronous motor proposed by the present invention will be further described in detail. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention.
[0045] Figure 4 A schematic cross-sectional view of the quarter rotor of this embodiment, Figure 5 for Figure 4 A partial enlarged view of the quarter rotor A shown.
[0046] like Figures 4 to 5As shown, a magnetic steel rotor includes a rotor body 12 with a magnetic steel slot 11 (shown by hatching in the figure), wherein the magnetic steel slot 11 can be used to accommodate a magnetic steel to provide a magnetic circuit, In addition, the inner wall of t...
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The invention provides a magnetic steel rotor and a permanent magnet synchronous motor. The magnetic steel rotor comprises a rotor body with a magnetic steel groove. The inner wall of the magnetic steel groove adjacent to the quadrature axis of the magnetic steel rotor has a part protruding toward the direction of the quadrature axis, and the cross section of the protruding part is of a circular arc shape. According to the magnetic steel rotor and the permanent magnet synchronous motor, through setting the protruding part with the cross section of a circular arc shape at the inner wall of the magnetic steel groove adjacent to the quadrature axis, the magnetic reluctance of a quadrature axis magnetic circuit is increased, the inductance of the quadrature axis is reduced, and the loaded torque fluctuation is reduced. At the same time, since the inductance difference between rectangular axes is reduced, the load magnetic field harmonic content is reduced, and the no-load back electromotive force harmonic is reduced. In addition, the protruding part also destroys the magnetic leakage path near a magnetic steel corner, the leakage magnetic flux is reduced, a main magnetic flux is increased, and thus the problem of reluctance torque reduction caused by inductance difference reduction is avoided, the protruding part is arranged on the magnetic steel groove, the integration formation of the protruding part and the magnetic steel groove is facilitated, and the processing cost is reduced.
Description
technical field [0001] The invention relates to the technical field of motors, in particular to a magnetic steel rotor and a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor is a motor that uses permanent magnets to provide a magnetic field. With the advantages of high power, high torque density, and high efficiency, it has gradually become the first choice for driving motors in hybrid electric vehicles and pure electric vehicles. [0003] In the existing permanent magnet synchronous motor, the permanent magnet (such as magnetic steel) on the rotor generally adopts a surface-mounted structure or a built-in structure. Among them, the magnetic steel in the "built-in" permanent magnet synchronous motor is usually installed in the magnetic steel groove on the rotor punch. Because the "built-in" permanent magnet synchronous motor can generate reluctance torque through the salient pole effect of the rotor, improve the torque lev...
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IPC IPC(8): H02K1/27H02K21/02
CPCY02T10/64
Inventor 蒋大千黄文祥陈益辉邵康罗平亮蒋东升张冠楠
Owner UNITED AUTOMOTIVE ELECTRONICS SYST