| http://www.w3.org/ns/prov#value | - A speed detection coil including 2n + 1 power generation strands for each of the magnet poles, where n is a positive integer, and extending radially around the rotation axis, is arranged in the magnetic field of the magnet and the magnetic field of the drive coils such that the magnetic fluxes of the magnet link with the plurality of power generation strands to cause them to generate a signal havi
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