An external rotor motor with polygonal dovetail spliced ​​magnetic steel structure

Abstract

The invention relates to the technical field of motors, and discloses an outer rotor motor with a polygonal dovetail spliced ​​magnetic steel structure, including a stator core, a stator coil, a rotor magnetic steel and a rotor back iron, wherein the rotor magnetic steel passes through the first permanent magnet, the second In the design of the second permanent magnet and the third permanent magnet, a plurality of permanent magnets whose cross-section is isosceles triangle or quadrilateral are spliced ​​together for a circle to form a closed rotor magnet, and the Halbach magnetization method is used to make each stator The electromagnetic force received by the stator coil in the tooth slot forms a closed loop along the tangential direction of the circumference, so that the outer rotor receives a stable torque and realizes stable rotation. At the same time, using the Halbach magnetization method can also form self-shielding, which can ensure that the air gap magnetic flux density in the motor is large enough at the same time to increase the output torque, reduce torque ripple, and increase power density. The force wave two-dimensional Fourier FFT2 analysis found that in the case of low order numbers, the vibration amplitude is significantly reduced, thereby improving the dynamic performance of the motor.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to an outer rotor motor with a polygonal dovetail spliced ​​magnetic steel structure. Background technique [0002] The permanent magnet synchronous motor is a widely used driver. Due to the use of high-performance permanent magnet materials as the rotor poles, the motor is small in size, light in weight and high in efficiency. Convenience, wide range of speed regulation, dynamic response and so on. Therefore, it has received more and more attention. It can replace the general permanent magnet brushed DC motor in many applications, and it can be used in servo systems, numerical control machining, machine tools, medical treatment, biochemistry, intelligent robots and other applications that require high precision. It is widely used as an AC servo motor. [0003] With the development of the home appliance industry, since the permanent magnet brushless motor can obtain higher efficien...

AI Technical Summary

Problems solved by technology

If the same material and magnetic flux density are used, the loss per unit volume of the stator core of the motor will be higher than that of ordinary power frequency motors. If measures to reduce core loss or cooling are not taken, the motor will not be usable

In addition, since high magnetic flux means high magnetic density, it is very easy to generate low-order vibration during operation

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