| 摘要 |
PURPOSE: To generate a high torque required to a motor without using equipment exclusively used for catch torque by enlarging the exciting current component of a current order value to an invertor by a calculation means when a changing switch is operated as required. CONSTITUTION: A calculation means 14 calculates a current order value by the speed order 11a from a speed order generation device 11 and a speed signal 12a from a speed detector 12 for detecting the speed of a motor and controls an invertor 5 through PWM(pulse width modulation) comparator 15 and drives the motor by the output current. When a changing switch 13 is closed at the catch test time, a changing order 13a is inputted to a calculation means 14 and the calculation means 14 enlarges the exciting current component of the current order value and enlarges the exciting current component of the output current from the invertor 5 through the PWM comparator 15. Thus, the high torque required on the catch test can be generated to the motor without using a covertor, reactor and invertor exclusively used for catch test. |
