| 摘要 |
PURPOSE:To enable to perform the stabilized slow-starting and slow-braking operation for the subject motor by a method wherein the preset current detected value, with which the discrimination of completion of acceleration and decceleration is performed, is changed corresponding to a pole conversion. CONSTITUTION:The voltage of the current of motors 1 and 2 detected by a current transformer 3 is divided by resistors 11, 12 and 13, and inputted to an acceleration and decceleration completion discriminating circuit 9, and the completion of acceleration or decceleration is discriminated by the fact wherein the above value is reached to the established value. The switch circuit 15 is turned to OFF position and the resistor 13 is short-circuited when a phase changed time discriminating circuit 14 is operated by a 4-pole motor 1, and the switch circuit 15 is turned to OFF position and the resistor 13 is turned to ON when said circuit 14 is operated by a 16-pole motor 2. Through these procedures, the stabilized slow starting and slow-braking operation can be performed. |
