| 摘要 |
<p>PURPOSE: To suppress the frequency drop of a motor by setting a voltage droop starting point so that a voltage is limited when it is equal to or more than a value set by the voltage droop starting point setting circuit by considering start current when starting, for example, a fan and a pump motor. CONSTITUTION: Above the rated current of an AC generator, a circuit for setting a voltage drop starting point for limiting the output voltage of an AC generator consists of a circuit where a resistor 8 is connected in series with the output of a DC voltage conversion circuit, a variable resistor 9 is connected in parallel, and then a zener diode 10 is connected in series. A variable resistor 11, a Zener diode 12, and a variable resistor 13 are connected in parallel with the voltage drop starting point setting circuit output to constitute a circuit for setting the amount of limiting. The circuit for setting the amount of limiting sets the amount of voltage drop of an AC generator 2 when an AC generator current exceeding a value set by the voltage drop starting point setting circuit flows.</p> |
