| 摘要 |
PURPOSE:To make the operation at a predetermined speed possible even though a power-supply voltage is varied in the case the operation is controlled depending on the secondary voltage of a wire-wound induction motor by proportionately varying the value of the command signal at the same rate as the variation of the secondary voltage. CONSTITUTION:The speed of rotation is controlled by feeding back the power generated in the secondary side of a wire-wound induction motor 1 to the primary side by a stationary Scherbius device 24. At this time, a power supply 3 is connected to a rotating-speed command means 19 containing a rectifier 9 without a stabilizing means, a voltage divider 11, and a speed setter 12 which generates a command signal depending on the voltage from the voltage divider 11. The output from the rotating-speed-command means 19 and the speed signal from a speed sensing means 13 are given to a comparator 16, thereby the triggering angle of an inverter 21 is controlled. Since the command signal varies at the same rate as the variation of the secondary voltage even though the secondary voltage is varied due to the variation of the power-supply voltage, the stable operation can be continued at a predetermined rotating speed. |
