Conventional elevators widely use AC winding-type asynchronous motor rotor string resistance speed regulation methods, and use relay-contactors to control cutting resistance. The drawbacks of this control method are not only mechanical shock, but when the braking and variable speed performance is poor, external resistance Large energy consumption, complicated wiring, frequent failures and poor safety.
Simple structure, speed regulation system, low cost of squirrel cage motor, PLC and inverter control system frequency lift platform, the lift platform can realize soft start and soft braking of the motor, i.e. slow start, slow parking brake, It can also realize multi-speed program control, so that the middle of the lifting process is accelerated, and the cargo transportation is fast, stable and safe.
The lifting and lowering of the hydraulic platform is realized by winding the steel wire with a motor. The lifting platform consists of ordinary motors, pulleys, wire ropes, hanging cages and various main electrical appliances. Position detection limit.
According to the hanging cage during the lifting process, it needs to start from slow to fast, and then from fast to slow, that is, to reach a certain speed after fast, when it is over, slow down, stop slowly, and soon The lifting process is divided into three time intervals, the lifting speed interval. Press the start button SB2, lift (or lower button SB3), the cage starts smoothly at a low speed, and runs to the desired position. The speed is fast, and the time and arrival are scheduled. Position, a quick and smooth stop.