| 摘要 |
PURPOSE:To control the number of revolution of an electric motor, i.e., cage speed with high precision by constituting a controller for hydraulic elevator so that the electric motor pattern is corrected by the speed difference obtained through the feedback of the actual cage speed signal. CONSTITUTION:Pattern generators 41U and 41D for generating the electric motor patterns for driving an electric motor and a speed detector which detects the actual speed of a cage and outputs the actual cage speed signal 60a are installed. Then, the actual cage speed signal 60a is subtracted from the electric motor pattern by a subtraction calculator 62, and the speed difference is generated. The speed difference is added onto the electric motor pattern by an adder 63, and the corrected electric motor pattern P is generated. |
