| 摘要 |
<p>A method for intelligent control is disclosed including exchange of historical parameters of events for operating a system and operting a hoist (1) where an electric motor, preferably a DC-motor (11), is used for lifting and lowering a lifting belt (6). It can take place at different speeds by registering amperage through the motor and to perform a switching between fast and slow speed when a given current level (18) is reached. The change in hoisting/lowering speed is achieved when a control unit (13) changes the voltage suplied by the battery unit (12) to the DC-motor (11) or changes the frequency of power supply to an AC-motor. The method makes ti possible to control the system and to optimise the hoisting/lowering speed for the lifting belt depending on the load thereon.</p> |
