Motor speed control system

专利名称：Motor speed control system发明人：Hiroshi Minakuchi申请号：US05/808289申请日：19770620公开号：US04149116A公开日：19790410

摘要：A motor speed control system detects a rotation speed of a motor, compares adetected output signal with a reference voltage or a reference frequency to produce anerror signal, produces a saw-tooth wave signal of an appropriate repetition frequency,compares the error signal with the saw-tooth wave signal to produce a switching signal,and drives a motor by the switching signal to control the speed of the motor. The systemincludes a first driver circuit for driving the motor by the output signal of a first

comparator circuit which produces the error signal, and a second driver circuit for drivingthe motor by the output signal of a second comparator circuit which produces theswitching signal. The motor is normally driven by the second driver circuit for speedcontrol and is driven by the first driver circuit when the motor is started or overloaded orwhen the second driver circuit is defective.

申请人：MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

代理机构：Stevens, Davis, Miller & Mosher

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