| http://www.w3.org/ns/prov#value | - ively, as drive currents thereto, a speed detection coil secured to said yoke and arranged within the magnetic field of said magnet and the magnetic field of said drive coils, said speed detection coil having a plurality of radially extending, series-connected power generation strands, 2n+ 1 strands for each of the magnet poles of said magnet, where n is a positive integer, a cancellation coil sec
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