Permanent magnet synchronous motor structure adopting built-in magnetic poles to weaken cogging torque
A technology of cogging torque and permanent magnet synchronization, applied to synchronous motors with stationary armatures and rotating magnets, synchronous machines, magnetic circuit rotating parts, etc., can solve noise, vibration, and reduce permanent magnet motor servo drive System control characteristics and operational reliability issues
Pending Publication Date: 2021-05-11
FUJIAN UNIV OF TECH
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[0007] In order to solve the deficiencies in the prior art, the present invention provides a permanent magnet synchronous motor structure that uses built-in magnetic poles to weaken the cogging torque, so as to solve the torque fluctuation caused by the cogging torque and reduce the control of the permanent magnet motor servo drive system characteristics and operational reliability, affect the control accuracy of the system, and cause problems such as vibration and noise
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[0024] The mechanism of the cogging torque of the permanent magnet motor: the cogging torque is the torque generated by the interaction between the permanent magnet and the iron core when the winding of the permanent magnet motor is not energized, and is generated by the interaction force between the permanent magnet and the armature teeth caused by the tangential component. When there is relative motion between the stator and the rotor, the magnetic permeance between the armature teeth and the permanent magnets in the pole arc part of the permanent magnets is basically unchanged, so the magnetic field around these armature teeth is also basically unchanged, and corresponds to the two sides of the permanent magnets. In a small area formed by one or two armature teeth, the magnetic permeability changes greatly, which causes the change of the magnetic field energy storage, thereby generating cogging torque. The cogging torque is defined as the negative derivative of the magnetic...
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A permanent magnet synchronous motor structure adopting built-in magnetic poles to weaken cogging torque is disclosed in the invention, and comprises a stator, a rotor and a rotating shaft, the rotating shaft is fixed to a center shaft hole of the rotor in a sleeving mode, the rotor is located on the inner side of the annular stator, a multi-pole stator groove is formed in the stator in the circumferential direction in a surrounding mode, a concentrated winding is distributed in the stator groove, a multi-pole permanent magnet mounting groove is formed in the rotor in the circumferential direction in a surrounding mode, the permanent magnet mounting groove comprises two symmetrically-arranged permanent magnet grooves, a U-shaped structure is formed between the two permanent magnet grooves, iron core bridges are embedded and fixed to the ends, close to a rotating shaft, of the two permanent magnet grooves, the two ends of the iron core bridge abut against the rotor respectively, and permanent magnets are embedded and fixed in the middles of the two permanent magnet grooves respectively. The problems that the cogging torque causes torque fluctuation, the control characteristic and the operation reliability of the permanent magnet motor servo driving system are reduced, the control precision of the system is influenced, vibration and noise are caused and the like can be solved.
Description
technical field [0001] The invention belongs to the field of permanent magnet motors, in particular to a permanent magnet synchronous motor structure which adopts built-in magnetic poles to weaken cogging torque. Background technique [0002] Permanent magnet synchronous motors are widely used in industrial applications due to their high efficiency, high torque density, and low vibration and noise performance characteristics. However, cogging torque is one of the unique problems of permanent magnet motors. It is a key issue that must be considered and solved in the design and manufacture of high-performance permanent magnet motors. Weakening the cogging torque can not only reduce the vibration and noise generated when the motor is running, It can also improve the low-speed performance of the motor in the speed control system and the high-precision positioning in the position control system. [0003] At present, the cogging torque weakening method of permanent magnet motor m...
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IPC IPC(8): H02K1/27H02K1/16H02K3/28H02K21/14
CPCH02K1/276H02K1/165H02K3/28H02K21/145
Inventor 刘成武吴铭施京凯吴平
Owner FUJIAN UNIV OF TECH