| 摘要 |
PURPOSE:To maintain a loop gain of a speed control system constantly irrespective of a magnetic flux by regulating the gain of a speed control circuit in response to the actual value of the magnetic flux. CONSTITUTION:An output of a magnetic flux calculator is inputted to a magnetic flux control circuit 13 and dividers 15, 16. The divider 15 divides the output of a speed control circuit 11 by the output of a magnetic flux calculator 14, and the output, i.e., the command signal of the torque current of the primary current is inputted to a vector calculator 19. Since the output of the circuit 11 is divided by the magnetic flux phi in this manner, the characteristics of the speed control system is determined irrespective of the magnetic flux. Therefore, high responding speed control can be always performed irrespective of the amplitude of the magnetic flux, the variation in a loop gain of a speed control system based on the magnetic flux phi can be eliminated, thereby performing the stable operation. |
