Rotor structure used for tangential permanent magnet direct current brushless motor, and tangential permanent magnet direct current brushless motor

Abstract

The invention discloses a rotor structure used for a tangential permanent magnet direct current brushless motor, and the tangential permanent magnet direct current brushless motor. The rotor structure comprises a rotor iron core, tangential permanent magnets and a rotation shaft; an even number of tangential permanent magnet grooves are formed in the circumference of the rotor iron core radially at the equal intervals; the tangential permanent magnets with the opposite polarities are arranged in the adjacent tangential permanent magnet grooves; the tangential permanent magnets are connected with or disconnected from the near air gap side; the central symmetry of the rotor iron core is maintained; the sides, close to the rotation shaft, of the tangential permanent magnet grooves are communicated with flux-insulation grooves on the two sides of the tangential permanent magnet grooves; the near air gap side of the flux-insulation grooves and the central line of the corresponding tangential permanent magnet grooves extend outwardly at an angle of alpha; and a radially-distributed flux-insulation bridge is formed between the adjacent flux-insulation grooves. The rotor structure used for the tangential permanent magnet direct current brushless motor is simple and compact in structure, small in magnetic leakage factor, high in mechanical strength, convenient to produce, low in manufacturing cost, higher in resistance to demagnetization, and high in overload capacity, so that the tangential permanent magnet direct current brushless motor is higher in torque / current ratio, torque / volume ratio and motor efficiency; and therefore, the rotor structure used for the tangential permanent magnet direct current brushless motor, and the tangential permanent magnet direct current brushless motor are brighter in the application prospects.

Description

technical field [0001] The invention relates to the technical field of DC brushless motor components, in particular to a rotor structure for a tangential permanent magnet DC brushless motor and the motor thereof. Background technique [0002] The tangential permanent magnet brushless DC motor has a "magnetic concentration" effect, so it has a higher air gap flux density than the radial motor rotor structure, and the unique convexity of the tangential permanent magnet brushless DC motor The pole-effect ratio can generate a larger reluctance torque, so that the motor has a larger torque / current ratio, torque / volume ratio and field-weakening speed expansion characteristics, so it has been widely studied and applied. [0003] At present, the rotor structure in the tangential permanent magnet brushless DC motor generally has many limitations, as follows: (1) The magnetic flux leakage coefficient is relatively large, especially near the inner side of the rotating shaft, resulting ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is that the rotor structure in the existing directional permanent magnet brushless DC motor has a relatively large magnetic flux leakage coefficient, low overload capacity, and complex structure and assembly

Images