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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...
Bearingless motors (BelMs) have two kinds of stator windings composed of motor windings and suspension windings in the same stator. Not only torque but also electromagnetic suspension force can be simultaneously generated in the same stator. Therefore, rotor shaft suspension can be realized without mechanical contacts and lubricant. In addition to advantages of magnetic bearings, the BelMs are expected...
The majority of weight in a motor is concentrated in two major areas: the magnetic core and the copper windings. All of the other components of the motor can and have been made of plastics (e.g. bearings, armature, and housing). Previously, due to the electrical and magnetic properties required for the windings and the magnetic core, these were constrained to high density metals, mostly copper and...
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