| http://www.w3.org/ns/prov#value | - The foregoing object of the invention has been achieved by the provision of a motor speed detecting device in which, among drive signals driving a plural-phase motor, m-phase drive signals (where m is a natural number which is not less than two (2) and equal to or smaller than the number of phases of said motor) are detected, and combined to form a signal; which, according to the invention, compri
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