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| Analytical Method for Air-Gap Main Magnetic Field Computation of Surface Mounted Permanent Magnet Torque Motors |
| Zhang Yuejin, Li Chunjiang, Tu Guanzhen, Jiang Jianzhong |
| Shanghai University Shanghai 200072 |
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Abstract An analytical method is used to solve the airgap magnetic field of surface mounted permanent magnet torque motors for being evaluated slotting effects accurately. The field region is divided into the smooth airgap region and the extended slot sub-regions. The magnetic vector potentials in the airgap region are first solved by the analytical method, and those in the extended slot sub-regions solved secondly by the numerical method. Boundary conditions in the extended parts of slot sub-regions are obtained by the analytical solutions while permanent magnets are dealt with the equivalent surface currents. After combining the results of each slot sub-region the flux density distributions in airgap region with slot opening are obtained. The airgap magnetic field with slot opening, electromotive force (EMF) computed by the proposed method are verified with those obtained from finite element method and test.
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Received: 30 September 2010
Published: 07 March 2014
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2011, Vol. 26 
