Magnetism-concentrated pole-shoe-shared permanent magnet motor

Abstract

The invention provides a magnetism-concentrated pole-shoe-shared permanent magnet motor relating to the technical field of permanent magnet motors and solving the problems of low power density, small torque and low response speed of a motor. The permanent magnet motor comprises a stator, a rotor and a plurality of magnetic poles, wherein each magnetic pole comprises two permanent magnets and a pole shoe, the outer side surfaces of the two permanent magnets are respectively engaged with the inner wall of the stator, the inner side surfaces of the permanent magnets are respectively engaged withthe pole shoe, and neighboring sides of the two permanent magnets have same polarity; the edges of the inner side surfaces of the two permanent magnets are connected, and an included angle between the inner side surfaces of the two permanent magnets is less than 180 degrees; the area of the pole shoe surface of the pole shoe is less than the sum of the areas of the inner side surfaces of the two permanent magnets, and an air gap is arranged between the pole shoe surface of the pole shoe and the circumferential surface of the rotor; and a side line of the radial sections of the permanent magnets, facing to one side of the neighboring magnetic poles, is a straight line, and a side line facing to one side of the other permanent magnet in the same magnetic pole is a fold line or curve. The motor provided in the invention has the advantages of high power density, large torque and high response speed.

Description

technical field [0001] The invention relates to the technology of permanent magnet motors, in particular to the technology of a magnetism-concentrating type co-pole shoe permanent magnet motor. Background technique [0002] At present, permanent magnet motors have been widely used in automatic control systems. Among them, ferrite, NdFeB and rare earth drill permanent magnet motors are used as fast response drive components, and AlNi drill magnet motors cannot be used mechanically in the design. conventional magnetic circuit. [0003] A reasonable magnetic circuit design can increase the air gap magnetic density and reduce the moment of inertia, which is extremely important for high-speed motors; for example, the acceleration of a permanent magnet servo motor is determined by the ratio of the peak moment to the total inertia of the motor load, to ensure Large torque requires relatively large inertia, and the increase of inertia will reduce the acceleration, which in turn wil...

AI Technical Summary

Problems solved by technology

[0004] like image 3 As shown, in the existing common pole shoe permanent magnet motor, each magnetic pole is composed of two permanent magnets 2' and a common pole shoe 3', and the outer surface of each permanent magnet 2' is fixed to the inner wall of the stator 1', The inner surface is fixed to the pole shoe 3', the inner surface edges of the two permanent magnets 2' in the same pole are connected, and the angle between the inner surfaces of the two permanent magnets is less than 180 degrees, and each permanent magnet 2' faces The surface on one side of the other permanent magnet in the same magnetic pole is a plane (that is, the line facing the other permanent magnet side in the same magnetic pole in its radial section is a straight line); the existing co-pole shoe permanent magnet motor improves the air gap magnetic field. The method of flux density (flux density) is: by enlarging the cross-section of permanent magnet or increasing the thickness of magnetic pole to gather magnetism; But, in the magnetic circuit structure in existing co-pole shoe permanent magnet motor, the flux density of permanent magnet is maximum The location is not the inner surface of the permanent magnet (that is, the joint surface of the permanent magnet and the pole shoe), but between the inner and outer surfaces of the permanent magnet, and the inner surface of the permanent magnet is lowered instead. Therefore, the existing common pole shoe permanent magnet The motor cannot effectively gather magnetism, nor can it effectively improve the power density, torque and response speed of the motor by increasing the air gap flux density

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