New type surface mounted permanent magnet synchronous motor with reduced cogging torque

Abstract

The present invention discloses a new type surface mounted permanent magnet synchronous motor with reduced cogging torque, which belongs to the technical field of electric motor manufacturing. The motor comprises a rotor and a stator. The stator is provided with a stator slot, and the stator slot is wound by rectangular armature windings. The structure of the rotor is that four evenly distributed fan-shaped rotors are welded on the rotor shaft, and the two end surfaces at the circumferences of the fan-shaped rotors are mounted with first permanent magnets in the same size, and the middle surfaces are mounted with second permanent magnets. There exist inclined angles among the second permanent magnets and the first permanent magnets. The thickness of the first permanent magnets gradually narrows from the middle to the two ends; and the thickness of the second permanent magnets gradually narrows from one end of the first permanent magnets to the other end. The invention is capable of weakening the cogging torque of permanent motors significantly; and at the same time, the use quantity of the silicon steel sheets of the rotation shaft makes the rotor lighter, which increases the output torque of the motor and improves the performance of the motor.

Description

technical field [0001] The invention belongs to the technical field of electric motor manufacturing, and in particular relates to a novel surface-mounted permanent magnet synchronous motor with reduced cogging torque. Background technique [0002] The cogging torque of the permanent magnet synchronous motor is an oscillating torque caused by the fluctuation of the interaction force between the permanent magnet and the stator cogging. Since the cogging torque will cause torque fluctuations, it may cause vibration and noise of the motor , when the motor is running at low speed and light load, it will affect the low-speed performance and high-precision positioning of the motor. It is very important to solve the cogging torque problem in the design of the motor, which can not only improve the starting performance of the motor but also improve the accuracy of the control system. [0003] The cogging torque cannot be completely eliminated by the existing technology, but its influe...

AI Technical Summary

Problems solved by technology

However, the improvement effect is not very ideal, and it is easy to cause excessive no-load back EMF and partial saturation of the temperature field

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