| 摘要 |
An internal rotor 2 having a radially outer rim 4 includes a circumferential array of magnet carriers 12 affixed to the outer rim 4 of the rotor and an inverted U-shaped pole piece retainer 18 made of non-magnetic material such as stainless steel is affixed to each magnet carrier 12 forming an axially extending channel receiving at least one permanent pole piece 16 made of a magnetic material such as steel located adjacent to the radially outer surface of each magnet carrier 12. Screws 20 and 14 secure the retainer and carrier respectively to the carrier and the rotor. Alternatively the retainer may be secured by adhesion, welding or clipping and the carrier by means of complimentary projections and recesses eg dove tails or tapered keys. A filling of non-magnetic material eg resin ,polymers or impregnated fibres/felt may fill gap 26. The arrangement may be applied to the inner circumference of an external rotor.
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