| 摘要 |
PURPOSE:To reduce the sounds of excitation in case of light load by changing exciting currents in response to load. CONSTITUTION:The driving device is constituted by a means 108 generating speed deviation signals from command speed and actual speed, an arithmetical means 113 generating amplitude signals from the speed deviation signals while generating output signals displaying the result of the multiplication of speed deviation signals and sine-wave signals, and means 116, 117 generating a three- phase current command by using the amplitude signals and output signals of the arithmetical means. Accordingly, since exciting currents are changed in response to speed deviation, torque, the sounds of excitation in case of light load or at low speed can be inhibited, and the generation of heat of the motor can also be reduced. |
