A vernier magnetic gear compound motor

Abstract

The invention discloses a vernier magnetic gear composite motor, which belongs to the field of low-speed high-torque direct drive motors. The vernier magnetic gear composite motor provided by the present invention increases the electromagnetic output torque under the same volume and loss by changing the traditional fractional slot concentrated winding permanent magnet motor into a split tooth vernier motor; by adopting a double-layer Halbach alternating pole permanent magnet rotor structure , The working magnetic field with different pole pairs is generated in the inner and outer air gaps, which shortens the magnetic flux path of the magnetic gear and permanent magnet motor and the thickness of the rotor yoke, and improves the working flux density and maximum transmission torque of the magnetic gear. In summary, the vernier magnetic gear compound motor provided by the present invention can realize low-speed high-torque output through the change and optimization of the motor type and permanent magnet rotor structure, and has higher torque than the traditional magnetic gear compound motor density and magnet utilization.

Description

technical field [0001] The invention belongs to the field of low-speed high-torque direct drive motors, and more specifically relates to a vernier magnetic gear compound motor. Background technique [0002] The magnetic gear compound motor is a new type of motor that has gradually emerged with the magnetic field modulation magnetic gear. It is a technology that combines the magnetic field modulation magnetic gear with the permanent magnet motor to achieve low-speed high-torque output. According to the number of air gaps and the degree of coupling of the composite motor, different forms are derived, including the three-layer air-gap magnetic gear composite motor with the permanent magnet motor and the gear magnetic circuit separated, and the two-layer air gap collimation motor with the closed slot stator embedded with magnetic steel. Drive magnetic gear compound motor and so on. The above magnetic gear compound motor structures mainly realize the multiplexing of the rotor st...

AI Technical Summary

Problems solved by technology

However, this solution still has some problems that restrict the improvement of torque density: 1. The motor part generally adopts a permanent magnet synchronous motor with fractional slot concentrated winding, and the selection of pole pairs is difficult to increase due to the restriction of magnetic gears, so the electromagnetic torque density is low. It is not as good as the vernier motor using the principle of magnetic field modulation; 2. The magnetic circuit coupling between the motor and the magnetic gear, the working magnetic field of the motor and the magnetic gear must pass through the multi-layer air gap to close, which reduces their working magnetic field strength, which is not conducive to the motor torque and The torque transmission of the magnetic gear is improved; 3. The inner permanent magnet rotor adopts a surface mount structure, and is surrounded and fixed by a non-magnetic metal frame, which increases the thickness of the air gap and reduces the working magnetic field of the air gap

(M. Johnson, M.C. Gardner, H.A. Toliyat, S. Englebretson, W. Ouyang, and C. Tschida, "Design, Construction, and Analysis of a Large-Scale Inner Stator Radial Flux Magnetically Geared Generator for Wave Energy Conversion," IEEE Transactions on Industry Applications, vol.54, no.4, pp. 3305–3314, Jul.2018, doi:10.1109 / TIA.2018.2828383.) The disadvantage of this solution is that the inner and outer layers of the permanent magnet rotor have permanent magnets of opposite polarity The magnetic field weakens each other, so that the utilization rate of the permanent magnet is not high; and only the radial permanent magnet works, so that the inner and outer magnetic circuits need a thicker iron core yoke to close the magnetic circuit, which increases the volume and quality of the permanent magnet rotor

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