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An analytical method that considers both fringing and leakage fluxes in the winding end region is proposed to compute the end-winding leakage inductance. The fringing effects are considered by a small equivalent core extension which produces the same flux linkages in the coils. To compute the leakage inductance related to the leakage fluxes, the end coils are modeled by serially connected helical...
This paper presents an analytical model of universal motors with the brush shifting from its neutral position by a certain angle for the sake of improving the commutation. In universal motors, the air-gap field distribution of the armature reaction is generally far away from sinusoidal waveform. Therefore the analysis can not be based on the d- and q-axis parameters. For this reason, the paper also...
We have developed a dynamic analytical circuit model to simulate the performance of switched reluctance motors (SRMs). Our model expresses flux linkages as multiple decoupled one-argument functions, either current dependent or rotor position dependent, instead of one two-argument function dependent on both current and rotor position. We propose a novel approach for the computation of the air gap permeance...
An analytical method is presented for calculation of no-load magnetic field distribution in the slot-less and slotted air gap of a spoke-type permanent magnet (PM) motor. The slot-less air-gap field and the relative air-gap permeance considering the effects of the slots are derived from the conformal transformation. The analytical field solutions are used to predict the cogging torque of an 8-pole,...
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