| 摘要 |
PURPOSE:To change a phase and feedback quantity so as to surely suppress vibration of a car cage by means of a simple method by adding a derivative element to a speed detector detecting a cage speed so as to detect cage acceleration and feeding the acceleration signal to a vibration suppressing controller. CONSTITUTION:Discharged oil from an oil pressure pump 9 supplying working fluid to a hydraulic cylinder 3 lifting/lowering a car cage 5 has pressure pulsation, and if a hydraulic plunger 2 is vibrated by the pressure pulsation, the vibration is transmitted to the car cage 5 via a pulley 1 and a main rope 4 so as to vibrate the car cage 5. Then, the vibration generated by a resonance phenomenon caused because of the main rope 4, an elastic modulus of the working fluid, and mass of the oil pressure plunger 2 is detected by a speed detector 12 via a rope 7 and a pulley 6, and a speed signal is converted into an acceleration signal by a differentiator 13 so as to be taken into a vibration suppressing controller 14, so that a control signal, in which feedback quantity and a phase are adjusted, is outputted. The control signal is converted into a pulse duration signal in a regulation circuit 17, and a modulation rate circuit 19 is regulated. |
