Outer rotor motor of polygonal dovetail type spliced magnetic steel structure

Abstract

The invention relates to the technical field of motors, and discloses an outer rotor motor of a polygonal dovetail type spliced magnetic steel structure. The outer rotor motor comprises a stator core, a stator coil, rotor magnetic steel and rotor back iron, wherein the rotor magnetic steel adopts the design of a first permanent magnet, a second permanent magnet and a third permanent magnet, a plurality of permanent magnets of which the cross sections are isosceles triangles or quadrangles are spliced into a circle to form the annular closed rotor magnetic steel, and a Halbach magnetizing mode is adopted, so that electromagnetic force borne by the stator coil in each stator tooth groove forms a closed loop in the tangential direction of the circumference, and therefore, an outer rotor is subjected to stable torque, and stable rotation is realized. Meanwhile, self-shielding can be formed in the Halbach magnetizing mode, the output torque can be increased, the torque pulsation can be reduced and the power density can be improved while the air gap magnetic flux density in the motor is ensured to be large enough, the vibration amplitude is obviously reduced under the condition of low order through radial force wave two-dimensional Fourier FFT2 analysis, and therefore, the dynamic performance of the motor is improved.

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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