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A novel brushless ac, doubly salient, permanent magnet (PM) machine is proposed. It has the novel features of: 1) PMs placed in the stator slots (SSPM) to premagnetize only the stator on open circuit; 2) fail-safe capability during uncontrolled generator operation or winding short circuits; and 3) negligible cogging torque. The basic operating principle, electromagnetic performance, PM demagnetization,...
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