The magnetic network model of hybrid step motor is established according to the airgap late permeance method, and the expression of the harmonic back EMF is deduced.
利用气隙比磁导法建立了混合式步进电动机的磁网络模型，推导出谐波反电势的表达式。
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The theoretical calculation result fits well with the experiment result, and the mathematical method adopted is feasible and valuable for the flux prediction of the airgap membrane distillation.
The SLIM parameters have clear errors to the real values on the base of the RIM parameter measurement method because there are larger airgap and edge effect.