二相永久磁石モータの補極形状のコギングトルクへの影響の解析

概要

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As two-phase motors used for small fan drive and so on has zero torque point round one rotation, self-starting is serious problem. Therefore it is necessary to reduce torque ripple and to improve ability of self-starting by choosing the most suitable combination of cogging torque and electrical torque. But some reported analysis using Finite-Element-Method has a limit on separation between permeance distribution and flux distribution. Considering these problems, we developed a new method to analyze cogging torque using Schwarz-Christoffel transformation. We calculate effect of inter-pole shape, magnetization distribution of parmanent magnet and position of Hall-sensor, and the following conclusion is obtained:(1) The inter-pole reduces ripple of permeance and cogging-torque.(2) It is necessary to make the minimal shift of inter-pole from center position.(3) By setting inter-pole gap equal or a little smaller than main teeth gap, total torque ripple can be reduced.(4) Magnetizing permanent magnet into sinusoidal distribution reduces cogging torque effectively.(5) Shifting the position of Hall-sensor against rotation direction improves ability of selfstarting.
社団法人電気学会の論文