| 摘要 |
PURPOSE: To improve the capability of a speed controller and enhance the comfortability of transfer in an elevator system without generating additional delay in a control loop by delaying the predicted value of a following sample by the time corresponding to one sample and forming a latest sample predicted value. CONSTITUTION: A frequency converter 2 is controlled by a control unit 9 constituting a speed controller. The rotation speed of a motor 3 is measured by a speed indicator generator 10, and a speed feedback signal is filtered by a filter 1 and fed to a control unit. A filtering method is based on the use of a predictor 11 with the low-pass type frequency response. The output of the predictor 11 is delayed by a quantity corresponding to one sample so that the estimated value of a latest actual sample to be provided is obtained. The noises of the regular distribution and the uniform distribution to be added to an original signal can be reduced effectively by using a predictor such as an FOR filter. |
