Method and structure for optimizing cogging torque of built-in type permanent-magnet synchronous motor
A permanent magnet synchronization and cogging torque technology, applied in the direction of synchronous machine parts, etc., can solve the problems of electromagnetic torque reduction, cogging torque reduction, complex processing technology and so on
Inactive Publication Date: 2016-09-28
SHANGHAI DIANJI UNIV
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[0003] However, while these methods reduce the cogging torque, the electromagnetic torque also decreases, and the electromagnetic torque ripple increases accordingly; in addition, some measures have relatively high economic costs and complicated processing techniques; in addition, different structures and different parameters The permanent magnet motor will have different effects by using the same method
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[0031] The invention slots the rotor to change the magnetic density of the air gap of the motor, so that the stored energy of the air gap changes, and finally reduces the cogging torque of the motor. The groove shape of the auxiliary groove is a quasi-triangle. Between the two poles of the motor, take the midline as the axis of symmetry, make the vertex of the quasi-triangle on the symmetry axis, and take a section of the outer circle of the rotor as the base of the quasi-triangle to form an isosceles triangle. According to symmetry, the slot is between each pair of poles, so several pairs of poles need to open several slots. The motor in this example has four pairs of poles, so four slots are required.
[0032] The different angles of the triangular-like vertices will also affect the waveform variation of the air-gap flux density. First, take the axis of symmetry as the center, and take a fixed point on the axis of symmetry as the vertex to form an isosceles triangle. Using ...
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A method for optimizing the cogging torque of a built-in permanent magnet synchronous motor, the built-in permanent magnet synchronous motor has a motor stator, a stator coil, a motor rotor, a permanent magnet, a magnetic isolation bridge and a motor shaft, and several holes are opened on the surface of the motor rotor Auxiliary slots, auxiliary slots are symmetrically distributed. The number of auxiliary slots is 4. The auxiliary slot is a quasi-triangular shape. Between the two poles of the motor, the midline is taken as the axis of symmetry, the apex of the quasi-triangular shape is on the symmetric axis, and a section of the outer circle of the rotor is used as the base of the quasi-triangular shape to form an isosceles triangle. The triangle-like apex angles are centered on the axis of symmetry, an isosceles triangle is formed with a fixed point on the axis of symmetry as the apex, and the size of the apex angle β is analyzed to obtain the best angle for optimizing the cogging torque. Under the condition that the vertex angle is constant, the height h of the quasi-triangle is changed. When the height h of the triangle increases, the cogging torque first decreases, then increases, and finally increases again, thus obtaining the optimal Location.
Description
technical field [0001] The invention belongs to the technical field of motors, in particular to a method and structure for optimizing cogging torque of a built-in permanent magnet synchronous motor. Background technique [0002] The cogging torque of permanent magnet synchronous generator is related to many factors, such as: permanent magnet pole parameters, armature parameters, number of armature slots and poles. By changing the pole arc coefficient of the magnetic pole, using permanent magnets of unequal thickness, magnetic pole offset, oblique pole, magnetic pole segmentation, changing the width of the slot, changing the shape of the teeth, chute, opening auxiliary slots, choosing a reasonable number of slots, etc. Both can change the cogging torque of the motor. [0003] However, while these methods reduce the cogging torque, the electromagnetic torque also decreases, and the electromagnetic torque ripple increases accordingly; in addition, some measures have relatively...
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Login to View More IPC IPC(8): H02K21/02
CPCH02K21/02
Inventor 徐蓉邹海荣
Owner SHANGHAI DIANJI UNIV