Magnetic field analysis method for design of sine magnetization concentric magnetic gear based on analytic method

Abstract

The present invention relates to a magnetic field analysis method for design of a sine magnetization concentric magnetic gear based on an analytic method. The magnetic field analysis method sequentially comprises the following steps of: S1, establishing a sine magnetization permanent magnet array mathematical model and compiling a corresponding computing program; S2, giving a number of pole pairs, a magnetic pole dimension, a number of magnetic blocks on each pole and a magnetization direction of a sine magnetization inner and outer rotor permanent magnet array; S3, determining basic structural parameters of the sine magnetization magnetic gear; S4, calculating a static magnetic field of the gear by the analytic method; and S5, calculating electromagnetic torques and torque-angle characteristics of inner and outer rotors of the magnetic gear. The magnetic field analysis method for the concentric magnetic gear, which is disclosed by the present invention, can be applied to electromagnetic design of numerous concentric magnetic transmissions such as a concentric magnetic harmonic meshing gear, a concentric cascaded magnetic gearbox, a concentric magnetic gear transmission disk and the like.

Description

technical field [0001] The invention relates to an analytical method-based magnetic field analysis method for sinusoidal magnetization magnetic gear design. Background technique [0002] Concentric magnetic gear is a transmission device that transmits magnetic force through non-mechanical contact. It uses the principle of magnetic field modulation to achieve large torque transmission. Compared with traditional mechanical gears, concentric magnetic gears overcome the inherent mechanical fatigue, friction loss and vibration noise of mechanical gear transmissions. No lubrication is required during operation. It has an automatic overload protection function, but the calculation of the electromagnetic field of the magnetic gear is relatively complicated. In the finite element calculation process, although the calculation accuracy is high, the calculation time is long, and the high precision needs to be guaranteed with good mesh quality. The rotation of the rotor in the calculati...

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Problems solved by technology

The calculation of the virtual displacement method is cumbersome; while the Maxwell stress tensor method is used to calculate the electromagnetic torque, the line integration path in the air gap needs to pass through many finite element grids, and the quality of the grid and where the grid cells pass through will affect the calculation results. have an impact

The calculated electromagnetic torque varies with the air gap radius, and does not reflect the fact that Maxwell's stress in the motor air gap has nothing to do with the selected surface

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