Segmented rotor consequent pole permanent magnet motor

Abstract

The invention discloses a segmented rotor consequent pole permanent magnet motor. The segmented rotor consequent pole permanent magnet motor comprises two segments of rotors, wherein the two segments of rotors are connected in an axial direction of the rotors, a surface of each segment of rotor is provided with multiple convex poles, grooves among the adjacent convex poles are embedded with permanent magnets, a convex pole and permanent magnet alternating arrangement structure is formed on surfaces of the rotors, the shape of the permanent magnets is in matching with the shape of the grooves, each surface of the permanent magnets and each surface of the grooves realize tight contact, upper surfaces of the permanent magnets and upper surfaces of the convex poles are arc-shaped surfaces, radian of the upper surfaces of the permanent magnets and radian of the upper surfaces of the convex poles are identical, all the upper surfaces of the convex poles and all the upper surfaces of the permanent magnets form an integral cylindrical surface, the permanent magnets on the two segments of rotors circumferentially offset for a half electric period angle, magnetizing directions of the permanent magnets on one segment of rotor are identical, and magnetizing directions of the permanent magnets on different segments of rotors are opposite. The segmented rotor consequent pole permanent magnet motor is advantaged in that disadvantages of a traditional surface-mounted permanent magnet motor are solved, permanent magnet materials and protection sleeves are saved, and magnetization of an end portion of a rotation shaft can be avoided.

Description

technical field [0001] The invention belongs to the technical field of motor structure, and in particular relates to a segmented rotor alternating pole permanent magnet motor. Background technique [0002] In recent years, due to its high torque density and high efficiency, permanent magnet motors have been widely used in home appliances, electric vehicles, wind power generation, aerospace and other occasions. [0003] The traditional surface-mounted permanent magnet motor has a structure such as figure 1 shown. The surface of the rotor is completely covered by permanent magnets, and the materials used for the permanent magnets are expensive rare earth permanent magnet materials, so the production cost of the surface-mounted permanent magnet motor is relatively high. [0004] In addition, the centrifugal force of the rotor may cause the surface-mounted permanent magnet to fall off. In order to avoid irreparable damage, it is necessary to add a non-magnetic protective cover...

AI Technical Summary

Problems solved by technology

The surface of the rotor is completely covered by permanent magnets, and the materials used for the permanent magnets are expensive rare earth permanent magnet materials, so the production cost of surface-mounted permanent magnet motors is relatively high

[0004] In addition, the centrifugal force of the rotor may cause the surface-mounted permanent magnet to fall off. In order to avoid irreparable damage, it is necessary to add a non-magnetic protective cover outside the permanent magnet, which not only increases the cost, but also makes the equivalent between the stator and rotor Larger air gap reduces output torque capability

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