| http://www.w3.org/ns/prov#value | - he first circuit means, and a speed set voltage which is a function the desired RPM of the rotor for producing a speed error signal; third circuit means to which is applied the PWM signal produced by the produced by the first circuit means for a power phase commutation signal, the frequency of which is 1/n times the frequency of the PWM signal applied thereto, where n is a positive integer great
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