A magnetic field optimization method for surface-mounted permanent magnet motors with unequal-thickness magnetic poles

A technology for permanent magnet motors and optimization methods, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of characteristic analysis and optimization design limitations, lack of magnetic field analysis and calculation methods, complex motor structure, etc., to achieve motor The effect of performance analysis is convenient and fast

Active Publication Date: 2017-09-05
TIANJIN UNIV
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  • Application Information

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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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  • A magnetic field optimization method for surface-mounted permanent magnet motors with unequal-thickness magnetic poles
  • A magnetic field optimization method for surface-mounted permanent magnet motors with unequal-thickness magnetic poles
  • A magnetic field optimization method for surface-mounted permanent magnet motors with unequal-thickness magnetic poles

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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] Such as 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 t...

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 eccentric magnetic pole structure It can effectively improve the air gap magnetic field distribution of the motor, and greatly reduce the back EMF harmonic and torque fluctuation, so it is widely used in surface-mounted permanent ...

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Abstract

The invention discloses a method for calculating the magnetic field of a surface-mounted permanent magnet motor with unequal-thickness magnetic poles, and relates to the field of calculation of the magnetic field of a permanent magnet motor, including: dividing the research area into three parts: a permanent magnet area, an air gap area and a stator slot area ;In the polar coordinate system, establish the scalar magnetic potential equation in the three types of regions; establish the magnetic field boundary conditions in the three regions of rotor core-permanent magnet pole, permanent magnet magnetic pole-air gap, air gap-stator slot; according to the scalar magnetic potential equations and magnetic field boundary conditions to obtain an analytical model of the magnetic field distribution of a permanent magnet motor containing only a single set of equal-thickness poles; superimposing the magnetic field calculation results of all single sets of equal-thickness poles permanent magnets to obtain the actual unequal-thickness permanent magnet motor Analytical expressions for magnetic fields. This method can accurately calculate the internal magnetic field distribution of surface-mounted permanent magnet motors with unequal-thickness magnetic poles, and provides an effective magnetic field calculation method for motor design and analysis. The calculation results can be further used to calculate 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 optimizing 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 Patents(China)
IPC IPC(8): G06F19/00
Inventor 夏长亮陈浈斐
Owner TIANJIN UNIV
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