| http://www.w3.org/ns/prov#value | - In FIG. 2, the same markings as markings in FIG. 6 indicate the same components or the equivalents. [0034] In FIG. 2, PC is a ripple/pulse converting portion which detects a component of rotating speed of a motor (call rotating speed of motor hereafter) by detecting ripples of input current flowing through the motor M, and converts the rotating speed to pulses with variable periods in response to
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