High-power density permanent magnet motor

Abstract

The invention relates to a high-power density permanent magnet motor, belonging to the field of motors, solving a problem of poor sine degree of an air gap flux density waveform in a conventional motor. The cross section of each main permanent magnet body in a linear electric motor secondary unit is in a shape of bilaterally symmetric hexagon or octagon, the bottom edge of the hexagon or octagon, close to an air gap side is shorter than the bottom edge far away from the air gap side, the main permanent magnet bodies are magnetized in parallel in a direction vertical to relative motion direction of a primary unit and the secondary unit, auxiliary permanent magnet bodies are magnetized in parallel in the relative motion direction of the primary unit and the secondary unit, and the main permanent magnet bodies and the auxiliary permanent magnet bodies are alternately and closely arranged and fixed on the air gap side of a conductive magnetic yoke. According to the high-power density permanent magnet motor disclosed by the invention, the cross section of each main permanent magnet body in the linear electric motor secondary unit is in the shape of radially symmetric octagon, and the length of the edge of the octagon at the air gap side is smaller than the length of the edge far away from the air gap side; the main permanent magnet bodies are magnetized radially or in parallel, and the auxiliary permanent magnet bodies are magnetized tangentially; and the main permanent magnet bodies and the auxiliary permanent magnet bodies are alternately and closely arranged in the circumferential direction and fixed on the surface of the air gap side of a rotor yoke drum.

Description

technical field [0001] The invention belongs to the field of motors, in particular to the technical field of high force density permanent magnet motors. Background technique [0002] Figure 9 Shown is a schematic structural diagram of a traditional double-sided coreless linear permanent magnet synchronous motor. The secondary of the motor is composed of a yoke plate and a flat permanent magnet. The permanent magnets are magnetized parallel to the direction perpendicular to the direction of motion. The permanent magnets are magnetized in the same direction, with the primary located between the two secondary plates. The normal component of the magnetic force line generated by the permanent magnet passes through the primary vertically, and the energized primary winding interacts with the magnetic field of the secondary permanent magnet to generate electromagnetic force and push the mover to move in a straight line. [0003] This kind of linear motor, especially the Halbach m...

AI Technical Summary

Problems solved by technology

[0003] This kind of linear motor, especially the Halbach motor, has the following disadvantages: the air gap flux density is low, and the sine degree of the air gap flux density waveform is poor, so the efficiency and thrust density of the motor are low, the thrust fluctuation is large, and the vibration and noise of the motor are high.

At the same time, the amount of secondary permanent magnets is large, and the weight of the secondary and the cost of the motor are high

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