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| A Magnetic Gearing |
| Du Shiqin, Jiang Jianzhong, Zhang Yuejin, Gong Yu |
| Shanghai University Shanghai 200072 China |
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Abstract A novel magnetic field modulation gearing which has two rotors and two layers of inner and outer air gap transmits torque by magnetic force with high density and efficiency, and could be a potential substitution of a mechanical gearing if used in lustration, low temperature, high altitude environment etc. The less pole pairs inner rotor and more pole pairs outer rotor rotate with different speeds and different directions. Due to the different rotation paces and directions of the two rotors, it is very difficult to adjust the meshes in the two air layers when pure finite element analysis is used. Calculating magnetic field by way of numerical and analytical combined method has advantage of no grid in the air gap region when rotors rotate freely, as well as aberration of grid shapes can be avoided. The analytical solution of magnetic vector potential in the whole air gap can be obtained with the value of air gap boundary points, thus the magnetic field harmonics especially the electromagnetic torque can be analyzed conveniently. On the basis of qualitative theoretic analysis and quantitative calculating by the numerical and analytical combined method, a prototype is designed and constructed. The high transmission torque density and efficiency of the magnetic field modulation gearing are illustrated by the test results.
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Received: 09 June 2009
Published: 04 March 2014
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2010, Vol. 25 
