A hybrid permanent magnet motor rotor structure with high torque density

Abstract

The invention discloses a rotor structure of a hybrid permanent magnet motor with high torque density and belongs to the technical field of motors. A plurality of rectangular grooves (2) are arrangedon the rotor perpendicular to the circumferential direction. A low end of the rectangular groove (2) is communicated with an arch groove (3), a rectangular ferrite (7) is embedded in the communication groove, and the magnetization direction of the ferrite (7) is tangentially perpendicular to the permanent magnet plane;. The upper end of the rectangular groove (2) is communicated with the T-shapedgroove (4); The left and right sides of the T-shaped groove (4) are provided with V-shaped grooves (5); The other end of the V-shaped groove (5) opposite to the opening is provided with a reinforcingrib (6); The left and right grooves of the V-shaped groove (5) are embedded with Nd-Fe-B (8) with the same polarity; A trapezoidal groove (9) is arranged on the side of the V-shaped groove (5) closeto the reinforcing rib (6) to restrict the movement of the NdFeB (8). The invention not only can improve the torque density of the hybrid permanent magnet motor, but also can reduce the flux leakage and improve the utilization ratio of the permanent magnet and the motor efficiency.

Description

technical field [0001] The invention discloses a high torque density hybrid permanent magnet motor rotor structure, which belongs to the technical field of motors. Background technique [0002] Rare earth materials are widely used in industrial production such as motors, but as a strategic resource, the supply of rare earth is unstable all the year round, and the price keeps rising. Therefore, the use of non-rare earth permanent magnets with low price and stable supply, such as ferrite partly replacing rare earth permanent magnets in motors, can significantly reduce the manufacturing cost of motors. However, since the magnetic energy product of ferrite is much lower than that of NdFeB permanent magnet materials and the coercive force is low, through reasonable rotor design, the high torque density of the motor can be guaranteed while reducing the amount of rare earth permanent magnet materials. And improving the anti-demagnetization ability of the motor has become the focus...

AI Technical Summary

Problems solved by technology

Although the permanent magnet built in the rotor has a salient pole effect and can use the reluctance torque, the leakage of permanent magnet is inevitable, the utilization rate of the permanent magnet is reduced, and the magnetic energy product of the ferrite permanent magnet material is much lower than that of NdFeB. Coercive force is also low, easy to be demagnetized

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