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Different-thickness-magnetic-pole-containing surface-pasting type permanent magnet motor magnetic field computing method

A permanent magnet motor, magnetic field calculation technology, applied in the fields of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of complex motor structure, no longer uniform radial thickness, lack of magnetic field analytical calculation methods, etc.

Active Publication Date: 2014-08-13
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the poles of permanent magnets are optimized, their radial thickness is often no longer uniform, and the structure of the motor becomes more complex, making it difficult to mathematically describe the rotor pole boundaries with the conventional subdomain model method, so that it is impossible to complete permanent magnets with unequal thickness poles. Analytical modeling of the magnetic field of a motor
Due to the lack of effective magnetic field analytical calculation methods, researchers have been greatly limited in the characteristic analysis and optimization design of surface-mounted permanent magnet motors with unequal-thickness magnetic poles.

Method used

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  • Different-thickness-magnetic-pole-containing surface-pasting type permanent magnet motor magnetic field computing method
  • Different-thickness-magnetic-pole-containing surface-pasting type permanent magnet motor magnetic field computing method
  • Different-thickness-magnetic-pole-containing surface-pasting type permanent magnet motor magnetic field computing method

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Embodiment 1

[0048] 101: Discretely divide the magnetic poles of unequal thickness along the circumferential direction, equivalent to N uniform and discrete permanent magnet blocks, and number the permanent magnet blocks under each pole;

[0049] like figure 1 As shown, this step adopts the idea of ​​discrete, discretely divides the non-uniform thick magnetic poles along the circumferential direction, and converts them into N uniform and discrete permanent magnet blocks. The permanent magnet blocks under each pole are numbered j=1, 2, 3, . When N takes a larger value, it can be considered that the radial thickness of each permanent magnet block is approximately equal, so as to carry out mathematical modeling on the motor model of a single set of equal-thickness magnetic poles.

[0050] If the pole arc coefficient of the motor is α p , then the polar arc coefficient α of each permanent magnet block after uniform discretization pj for

[0051] alpha pj = α p / N (1)

[0052] Since the...

Embodiment 2

[0089] figure 2 It is a structural schematic diagram of a surface-mounted permanent magnet motor with conventional equal-thickness poles and a surface-mounted permanent magnet motor with eccentric poles. Among them, 1a is the traditional equal-thickness magnetic pole, 1b is the eccentric magnetic pole, 2 is the air gap, 3 is the stator slot, 4 is the rotor core, and 5 is the stator core. Compared figure 2 (a) and figure 2 (b) It can be found that the radial thickness of the traditional equal-thickness magnetic pole 1a is uniform and does not change with the change of the mechanical angular position; while the radial thickness of the eccentric magnetic pole 1b is uneven, thicker in the middle and thinner at both ends. Research shows that this kind of eccentricity The magnetic pole structure can effectively improve the magnetic field distribution in the air gap of the motor, and greatly reduce the back EMF harmonics and torque fluctuations, so it is widely used in surface-m...

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Abstract

The invention discloses a different-thickness-magnetic-pole-containing surface-pasting type permanent magnet motor magnetic field computing method and relates to the field of permanent magnet motor magnetic field computation. The method comprises the steps that a research region is divided into a permanent magnet region, an air gap region and a stator slot region; under a polar coordinate system, scalar quantity magnetic potential equations in the three regions are built; magnetic field boundary conditions of a rotor core-permanent magnet pole region, a permanent magnet pole-air gap region and an air gap-stator slot region are built; according to the scalar quantity magnetic potential equations and the magnetic field boundary conditions, a permanent magnet motor magnetic field distribution analytical model only containing a single group of uniform thickness poles is obtained; magnetic field computation results of all permanent magnet motors with single groups of uniform thickness poles are overlaid to obtain a magnetic field analytical expression of an actual permanent magnet motor with different-thickness magnetic poles. According to the method, the magnetic field distribution of the surface-pasting type permanent magnet motor containing the different-thickness magnetic poles is accurately calculated, an effective magnetic field magnetic field is provided for motor design and analysis, and a computation result can be further used for calculating other electromagnetic properties of the motor.

Description

technical field [0001] The invention relates to the field of calculation of the magnetic field of a permanent magnet motor, in particular to a method for calculating the magnetic field of a surface-mounted permanent magnet motor with magnetic poles of unequal thickness. Background technique [0002] Surface-mounted permanent magnet motors have high efficiency, power factor and torque density, so they are widely used in elevators, wind power, hybrid vehicles and many other industrial fields. Among them, the permanent magnet pole is one of the important components of the permanent magnet motor, which directly affects the cost of motor manufacturing and the performance of the entire system. At present, the magnetic pole structure commonly used in surface-mounted permanent magnet motors is radial and equal-thickness magnetic poles, and the magnetization method is radial magnetization or parallel magnetization. Permanent magnet motors with magnetic poles of this shape often have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 夏长亮陈浈斐
Owner TIANJIN UNIV
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