| 摘要 |
PURPOSE:To conduct smooth revolution when torque is small, and to reduce heat loss when torque is large by setting the range of variation of sliding speed in response to the value of command torque. CONSTITUTION:Rotational speed omegar is inputted to a speed control amplifier 1. Torque T is inputted to the second input terminal of a memory 22 through an A/D converter 19 from the output terminal of the speed control amplifier 1. The output terminal of the memory 22 is connected to a divider 2, a differentiator 12, a constant setter 15, etc., through a digital-analog converter 23. Data stored in the memory 22 control sliding frequency omegas so as to minimize the speed variation of a motor when command torque T is small and lower the loss of the motor when command torque T is large. |
