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An accurate knowledge of the air-gap magnetic field distribution is necessary for the design of PM torque motors. The two-dimensional air-gap magnetic of the surface-mounted permanent-magnet motor can be solved by the numerical method or the analytical method. The analytical method contributes to the optimization design and structural adjustment not only because its physical concept is instinct and...
The paper attempts to present some effectively methods to reduce cogging torque for low-speed and direct-drive(LSDD) permanent magnet motor. Meanwhile, finite element analysis software is used for magnetic field distribution. Flux line and magnetic field are symmetrical in the whole motor. The distribution regularities of flux line and magnetic field are the same.
We present a new approach to computing cogging torque based on only one analytical field solution in surface-mounted permanent-magnet (PM) motors. We use conformal transformation to compute the magnetic field created by the permanent magnets in the air gap with a single slot. Then, we derive the cogging torque due to the single-slot effect at different rotor positions directly from the 2-D analytical...
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