Motor

Abstract

The invention relates to a motor and particularly relates to the motor. The motor comprises a rotor and a stator which are matched with each other, the rotor includes a rotor bracket, neodymium iron boron permanent magnets, ferrite magnets and pole shoes, the neodymium iron boron permanent magnets are circumferentially distributed on the rotor bracket, the ferrite magnets cover axial side surfaces, close to the stator, of the neodymium iron boron permanent magnets, the pole shoes are arranged on the rotor bracket, and every two adjacent neodymium iron boron permanent magnets are separated by the corresponding pole shoe. The motor is advantaged in that the ferrite magnets are arranged on the axial side surfaces of the neodymium-iron-boron permanent magnets, the neodymium-iron-boron permanent magnets are far away from a stator iron core, the air-gap magnetic fields of the positions where the neodymium-iron-boron permanent magnets are located are relatively uniform, and therefore eddy currents are reduced. Besides, the position close to the motor stator iron core is replaced by the ferrite magnets, the ferrite magnets have good insulating property, eddy current loss is hardly generated even in a high-frequency rotating magnetic field, problems that in the prior art, a rotor of a disc type motor easily generates eddy currents in a magnetic field, consequently the rotor is demagnetized, and the salient pole rate is low are solved.

Description

technical field [0001] The invention relates to a motor, in particular to a motor. Background technique [0002] In the rotor structure of the existing permanent disk motor, the position of the magnet in the magnetic circuit is mostly a surface mount structure. like Figure 1-2 As shown, the rotor 1' cooperates with the stator 2', the rotor 1' includes a rotor bracket 11' and a permanent magnet 12', the stator 2' includes a stator core 21', and the stator core 21' opens toward the end surface of the permanent magnet 12'. There are stator slots 211', and the permanent magnets 12' are directly exposed in the air gap. This structure can bring advantages such as high torque coefficient and back EMF coefficient, but it also has many defects: such as large cogging effect, large torque ripple, Poor stability at low speed, etc. [0003] like figure 2 As shown, due to the setting of the stator slot 211', the air gap magnetic field at the position where the permanent magnet 12' is...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems that the rotor of the disc motor existing in the prior art is prone to generate eddy currents in the magnetic field, causing the rotor to demagnetize; the saliency rate is low, the present invention proposes a motor that solves the above technical problems

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