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
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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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