| 摘要 |
PURPOSE:To perform a stable operation without delay of speed detection nor accuracy variation by electrically detecting the speed without using a signal form a pulse encoder for the detection of the speed. CONSTITUTION:A calculator 16 for calculating slip angle frequency command Pomegas*, a slip frequency Pomegas and their difference PDELTAomegas, and a controller 15 of a proportional integration compensator for controlling an electric angle frequency omega to set the deviation PDELTAomegas to 0 are provided. Further, the angular speed omegar of a rotor used for a speed controller is obtained by using a subtractor 17 and a circuit 18 for multiplying a reciprocal of the number P of poles. Thus, if the response of the controller 15 is sufficiently rapid, the delay of the speed detection can be ignored, and since omegar is obtained from an electric value, the accuracy becomes the same as the controller itself, thereby controlling the motor speed without variation in the detecting accuracy. |
