| 摘要 |
PURPOSE:To perform accurate positioning control by supplying a DC current between two terminals of a motor to stop braking and supplying a positive or negative current to the other terminal to control to correct the stopping position. CONSTITUTION:The operating arm transistors Tu, Tz of an inverter 12 are driven immediately before the stopping point to supply a brake current iR to an induction motor 14 to perform a control operation. Thus, the motor 14 stops at a time t=T1. At this time, if the stopping position of the motor 14 is overrun with respect to the target value, the transistor Tv of the inverter 12 is driven at a time t=T2 to supply a current is to the motor 14, thereby generating a torque. As a result, the stopping position of the motor 14 is controlled to be corrected. |
