| 摘要 |
PURPOSE:To suppress a torque ripple by providing 3 magnetoelectric transducers, first and second amplifying means of special configurations, and sensitivity regulating means for regulating the voltage supplied to the transducers. CONSTITUTION:Hall elements 1-3 are disposed on a stator by a drive device of a DC commutatorless motor, and the outputs are supplied through a composite circuit 50 to amplifiers 100-300. The outputs of the amplifiers are supplied to one ends of resistors 4-6, and noninverting input terminals of power amplifiers 400-600, and the outputs are supplied to stator windings 7-9 to drive then. A control voltage input terminal 20 is connected with the noninverting input terminal of a control amplifier 800, and the output is connected with a resistor 12 and the inverting input terminal of a comparator 900. The output of the comparator 900 is applied to power supply terminals of the elements 1-3, and the divided voltage by resistors 13, 14 is supplied through a buffer 1000 to the resistors 4-6. Thus, bias currents are supplied from the amplifiers 100-300 to the amplifiers 400-600 to reduce a torque ripple. |
