PURPOSE: To rationalize the assembling of a motor device by generating an index pulse whenever the motor passes through a specific angular position and variably setting the generating timing of the index pulse by delaying the timing within an electrically programmable range.
CONSTITUTION: Whenever a motor 1 passes through a specific angular position, a Hall element (Hi) outputs a detecting signal. When the detecting signal is outputted, an index pulse (Pi) having a pulse width tw which is decided by the current value of a constant-current source 10 and capacitance value of a capacitance element C2 is generated with a time lag td which is decided by the resistance value of a fixed resistor Rt0, capacitance value of a capacitance element C1, reference voltages V1 and Vth1 and outputted from a collector Q3. The generating timing of the pulse (Pi) is corrected by means of an external delaying element composed of the resistor RtO and element C1 and a delaying element 34 while the timing fluctuates due to the fitting error of the element (Hi), etc. Namely, the timing can be corrected by using the time lag td which is variably set in accordance with an externally executed electrical program through terminals A and B.
TSUNODA TOSHIYUKI
KIMURA REIICHI
OKUBO YUICHI
HITACHI TOBU SEMICONDUCTOR LTD
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