Double-cosine air gap flux switching servo motor

Abstract

The invention provides a double-cosine air gap magnetic flux switching servo motor which comprises a rotor and a stator arranged outside the rotor. An air gap is reserved between the stator and the rotor, and the rotor side boundary and the stator side boundary of the air gap are in a cosine curve shape. According to the present invention, the rotor side boundary and the stator side boundary of the air gap are all cosine curve shapes, so that air gap magnetic field harmonic waves generating cogging torque can be effectively weakened, then the cogging torque is reduced, the torque fluctuation is reduced, and meanwhile the sufficient output torque is guaranteed.

Description

technical field [0001] The invention relates to the technical field of servo motors, in particular to a double cosine air gap flux switching servo motor. Background technique [0002] With the rapid development of power electronics, microelectronics, sensing technology, permanent magnet technology and control theory, especially the successful application of advanced control strategies, the research and application of AC servo systems have achieved remarkable development. The static characteristics are completely comparable to the DC servo system, and it has become an important development trend for the AC servo system to replace the DC servo system. Among them, the AC permanent magnet synchronous motor has become a hot spot in today's servo drive system due to its advantages of simple structure, high air gap flux density, high power density, and small moment of inertia. [0003] However, the traditional servo motor has the following problems: 1) The structure of the permane...

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Problems solved by technology

[0003] However, the traditional servo motor has the following problems: 1) The structure of the permanent magnet placed on the surface of the rotor increases the length of the air gap, increases the volume of the motor, weakens the magnetic density of the air gap, and affects the output; 2) The permanent magnet placed inside the rotor core affects The mechanical strength of the rotor is not conducive to high-speed operation, which increases the difficulty of the manufacturing process; 3) The permanent magnet structure of the rotor is not conducive to the heat dissipation of the permanent magnet; 4) The armature reaction magnetic flux generated by the winding enters the rotor and is coupled with the permanent magnet. There is a certain risk of demagnetization in the magnet

However, because the motor adopts a double salient pole structure, the cogging torque of the motor is large and the output torque fluctuates greatly, which does not meet the control accuracy requirements of the servo system for speed and position.

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