| 摘要 |
PURPOSE:To increase the peak value of a current and to reduce torque ripples by supplying a pulse current to a Hall element and by sample-holding the output voltage of the element by the pulses which are in synchronization with the pulse period. CONSTITUTION:A first switching element 26 is inserted between the junction of a first and second resistors 22 and 23 and one input terminal of an operation amplifier 11, and a second switching element 27 is inserted between the junction of a third and fourth resistors 24 and 25 and the other terminal of the operation amplifier 11. A first holding capacitor 28 is connected between the junction of the first element 26 and the amplifier 11 and the output terminal of a final-stage amplifier, and a second holding capacitor 29 is connected between the junction of the second element 27 and the amplifier 11 and the ground. To the first and second elements 26 and 27, are supplied sampling pulses which are in synchronization with pulses of a pulse current supplied from a holding element 6. In this constitution, torque ripples can be reduced. |
