Permanent magnet motor rotor with direct-axis inductance larger than quadrature-axis inductance

Abstract

The invention discloses a permanent magnet motor rotor with direct-axis inductance larger than quadrature-axis inductance. The permanent magnet motor rotor comprises a rotor core formed by rotor sheets, permanent magnets and magnetic flow barriers, wherein the permanent magnets are arranged in the rotor core and are evenly distributed along the circumference of the rotor core, the magnetic flow barriers are arranged on quadrature-axis magnetic circuits between adjacent permanent magnets, the magnetic flow barriers are in one or more combined shapes of round holes, rectangles, arcs, sectors and triangles, and the permanent magnets are in the shape of U, or V, or W, or a long strip, or a rectangle and the like. Due to the fact that the magnetic flow barriers are arranged on the quadrature-axis magnetic circuits between the poles of the permanent magnets in the rotor and the poles of the permanent magnets are different in shape, the ability of generating torque of a permanent magnet motor is maintained, the demagnetizing effect of direct-axis currents on the permanent magnets in the operation process of the permanent magnet motor is lowered, thinner permanent magnets can be adopted, and cost of the permanent magnet motor is lowered.

Description

technical field [0001] The invention relates to a permanent magnet motor rotor with a direct axis inductance greater than a quadrature axis inductance. Background technique [0002] Permanent magnet motors have the advantages of small size, light weight, high efficiency and energy saving. The permanent magnet motor rotor with permanent magnets embedded in the rotor can make better use of the torque generated by the permanent magnets and the reluctance torque generated by the unbalanced AC and direct axis reluctance, so that the motor has better torque generation capability. [0003] The following formula (1) is the electromagnetic torque equation of the interior permanent magnet motor: [0004] [0005] where T em - the electromagnetic torque of the motor; [0006] d—subscript d indicates the direct axis component; [0007] q—the subscript q indicates the direct axis component; [0008] u d , u q — d, q axis components of the stator voltage; [0009] i d i q — d...

AI Technical Summary

Problems solved by technology

Direct axis current i at field weakening d Potential for permanent magnet demagnetization, which limits motor performance

In order to prevent the demagnetization of the permanent magnets, thicker permanent magnets are required, resulting in an increase in the cost of the entire motor

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