Magnetic field modulation type Halbach permanent magnetic direct drive motor

Abstract

The invention relates to a novel magnetic field modulation type Halbach permanent magnetic direct drive motor, which solves the problems of slow operation, large volume and complicated system of the traditional motors by the magnetic field adjusting effect of a magnetic field adjusting ring in the motor. Simultaneously, an outer rotor adopts a Halbach permanent magnetic array capable of providing larger effective magnetic field harmonic components and output torque, reducing the magnetic flux density of the magnetic yoke of the outer rotor, and reducing the iron core loss. A motor stator and the magnetic field adjusting ring are fixed by a motor shaft, the outer rotor and the motor shaft are rotatably connected, permanent magnets are evenly embedded on the outer rotor yoke along the circumferential direction, magnetic blocks of the magnetic field adjusting ring are evenly distributed along the circumferential direction, the sum of the number nr of pole-pairs of the permanent magnets and the number np of pole-pairs of armature windings is equal to the number ns of the magnetic blocks in the magnetic field adjusting ring, and the ratio of the number of pole-pairs of a stator magnetic field to the number of pole-pairs of the permanent magnets is the speed transformation ratio which can be realized by the device. By properly selecting the number of pole-pairs of the outer rotor of the motor and the number of the magnetic blocks in the magnetic field adjusting ring, the invention can be applied to low-speed direct drive occasions with different requirements.

Description

technical field [0001] The invention relates to a magnetic field modulation type Halbach permanent magnet direct drive motor device, which belongs to the technical field of new special motors. Background technique [0002] In order to avoid problems such as high noise, low efficiency, low transmission accuracy, slow response, and mechanical wear of mechanical gear transmission systems in industrial production, direct drive motors are often used. However, the traditional direct drive motor has low speed, bulky size and high cost. The magnetic field modulated permanent magnet motor is a recently proposed direct-drive motor. It realizes the control of the high-speed motor and the output of the low-speed direct-drive high-torque through the magnetic field modulation of the motor's intermediate magnetic ring. Due to the high magnetic flux leakage and iron core loss, its power density is limited. The Halbach array is a new type of permanent magnet arrangement, which arranges the...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of the original magnetic field modulation type motor flux leakage and the large magnetic density of the yoke, the present invention provides a Halbach array to provide greater effective magnetic field harmonic components and output torque, while reducing the outer rotor yoke Magnetic flux density, magnetic field modulation Halbach permanent magnet direct drive motor with reduced core loss

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