| 摘要 |
<p>PURPOSE:To prevent a load from fluctuating or overturning by detecting the variation in a load torque produced by the fluctuation of the load and combining it with a command speed signal. CONSTITUTION:A commercial power source is supplied through a rectifier 1, a smoothing condenser 4 and an inverter 2 to an induction motor 3. A voltage/ frequency converter 8 inputs a deviation DELTAV between the preset voltage Vd*, and a DC voltage Vd and a speed command W*, and outputs a positive load fluctuation correcting angular frequency signal DELTAW when DELTAV is negative. A voltage and angular frequency command signal generator 5 outputs a voltage command signal V and an angular frequency command signal W in response to the command W*, and the signal W is added to the signal DELTAW to become an angular frequency command signal W'. A base drive crcuit 30 controls the inverter 2 in response to the signal V and the signal W'.</p> |
