| 摘要 |
PURPOSE:To remarkably reduce the cost of an AC motor by commonly using a memory and a digital-to-analog converter to control a plurality of AC motors, thereby reducing the number of parts. CONSTITUTION:In an AC motor control system, analog switches 21, 24 are switched to commonly use ROM22 and D/A converter 23 for controlling a plurality of shafts. Shaft control signals output from numerical controller is converted through a D/A converter into an analog signal, which is, for example, applied to the base of a FET, and phase current commands are output by commonly using ROM22 and D/A converter 23 by synchronizing corresponding analog switches 21, 24. |
