| http://www.w3.org/ns/prov#value | - Here, as shown in FIG. 24A, the reference voltage Vref is a voltage corresponding to a predetermined threshold value Sth set within an allowable interval of the target rotation number S. Accordingly, the output signal of the comparator 371 becomes the H-level when the target rotation number S shown by the second extracting signal becomes the threshold value Sth or more.
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