摘要 |
<p>PURPOSE:To carry out a variable speed control accurately through a simple circuit configuration and also to generate a pulse output necessary for the control by inputting contents of a given reference register and instantaneous register to a comparison circuit. CONSTITUTION:When a stage signal corresponding to a digital control volume is outputted, a given register is selected from out of an instantaneous register holding an instantaneous data of motor 100 given through analog/digital conversion circuits 124, 127 and a reference register holding a reference data, and the contents are inputted to a comparison circuit. An output of the comparison circuit is retained in a given comparison holding circuit, and a gate pulse to be given to thyristors 186- 197 of an inverter 160 to drive the motor 100 is controlled according to output of the comparison holding circuit.</p> |