| 摘要 |
PURPOSE:To improve the starting characteristics and ride comfortableness characteristics during run by detecting a rotation speed of a hydraulic pump, inputting it to a speed determining means, selecting a control constant for a controller for a high-precision high-speed response for a low speed range, and controlling for a low-speed response for a high speed range. CONSTITUTION:A rotation speed of a three-phase induction motor 6 is detected by a speed detector 18, it is given to an adder 15, and it is given to a speed determining means 20 simultaneously. For a speed-zero range with a very low rotation speed, a signal A is generated, and a control constant A for characteristics of a high-precision high-speed response for a controller 14 is selected by a controller selector 21, so a smooth inverse rotation is obtained. The speed determining means 20 generates a signal B for a speed exceeding the very low speed-zero range, a control constant B for the controller 14 is selected by the controller selector 21. The performance for the precision and response speed becomes a little low, which is convenient for a vibration system of an elevator comprising a hydraulic system and a rope system, thereby the vibration of a basket during run is reduced. |
