A permanent magnet synchronous motor rotor structure with bow-shaped permanent magnets

A technology of permanent magnet synchronous motor and rotor structure, applied in the direction of synchronous machine parts, etc., can solve the problem of poor sine of the air gap flux density waveform, achieve the effect of improving the air gap flux density waveform, expanding the scope of application, and improving the waveform

Active Publication Date: 2016-08-24
NORTHWESTERN POLYTECHNICAL UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

[0007] In order to avoid the deficiencies of the prior art, the present invention proposes a permanent magnet synchronous motor rotor structure in which the permanent magnet is bow-shaped, and solves the problem of poor sinusoidality of the air gap flux density waveform of the fractional slot concentrated winding permanent magnet synchronous motor

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  • A permanent magnet synchronous motor rotor structure with bow-shaped permanent magnets
  • A permanent magnet synchronous motor rotor structure with bow-shaped permanent magnets

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Embodiment Construction

[0019] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0020] The invention provides a bow-shaped rotor structure of a permanent magnet synchronous motor, which has a rotor core, and each pole of the rotor core is provided with a permanent magnet and a magnetic isolation bridge; the permanent magnets in each pole are bow-shaped, and have an arc-shaped opening towards the center of the rotor core. Wherein, the permanent magnets in each pole are distributed symmetrically with respect to the radial centerline of the pole.

[0021] In this invention, the permanent magnets of each magnetic pole are arcuate and the arc-shaped side opens towards the center of the rotor core, and the maximum value of the thickness of the permanent magnet of a magnetic pole in the magnetization direction is H max Appears in the middle of the pole with a minimum thickness of H min Appearing at both ends of the magnetic pole, the pole arc coe...

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Abstract

The invention relates to a permanent magnet synchronous motor rotor structure with an arched permanent magnet. One edge of arched magnetic steel of the permanent magnet synchronous motor rotor structure is in an arc shape, and the other edge of the arched magnetic steel of the permanent magnet synchronous motor rotor structure is in a straight-line shape; an opening of the arc shape faces the center of a rotor core, and air-gap fields and winding back electromotive force potential waveforms can be obviously improved. Meanwhile, magnet separating bridges are arranged on the two edges of each magnetic pole of the rotor structure respectively, and the leakage magnetic flux can be reduced through the arrangement of the magnet separating bridges. Gap flux density waveforms of a permanent magnet synchronous motor are essentially improved, the back electromotive force potential waveforms of the permanent magnet synchronous motor are accordingly improved, eddy-current losses are reduced, torque pulsations are reduced, vibration and noise of the motor are reduced, the temperature rise of the motor is decreased, the efficiency of the motor is improved, the operation stability of the motor is improved, and the overall performance of the motor is improved.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a permanent magnet synchronous motor rotor structure in which permanent magnets are bow-shaped. Background technique [0002] With the gradual maturity and completeness of the design, development and control technology of permanent magnet synchronous motors, as well as the continuous development of permanent magnets in terms of performance and industrialization, permanent magnet synchronous motors have both good speed regulation characteristics of DC motors and AC motors. Due to the advantages of simple structure, convenient maintenance, stable operation and reliable performance, the demand in various fields is increasing, and the development prospect is getting better and better. At present, permanent magnet synchronous motors are widely used in various servo motors, wind power generation fields, electric vehicle drive fields, and CNC machine tool electric spindle mot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K21/02
Inventor 刘景林吴增艳李世良杨奔
Owner NORTHWESTERN POLYTECHNICAL UNIV
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