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Industrial applications involving torque BLDC motors require high efficiency over a large speed range. In order to achieve such specifications, the flux weakening is necessary, which could lead to relative high mechanical vibrations and consequently to audible noise. Furthermore, to decrease cogging torque and to satisfy motor manufacturing constraints, concentric windings are usually considered....
This paper investigates the back EMFs of four surface-mounted permanent magnet machines with different winding arrangements for education purpose. They are a): a 4-pole machine with integral-slot distributed winding, b): an 8-pole machine with fractional-slot distributed winding, c): a 12-pole machine with integral-slot concentrated winding and d): a 24-pole machine with fractional-slot concentrated...
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