Direct Torque Control Of The Elevator Door Control System

Direct Torque Control (DTC) method is a new high performance control techniques for asynchronous motor drivers after vector control, which emerged recent ten years ago. On the basis of analyzing the DTC techniques all over the world, the gate-motor system of the elevator has been set up.The theoretical analysis and system constitute of the DTC have been carried out in this paper. We discuss the influence on the flux and torque when the multi-voltage space vector is applied on the motor. Then the strategy of producing hexagon flux or circle flux is proposed. It is believed that, in order to control the torque optimally in DTC system, the stator current needs to be observed predictably . Also the method to observe the current is given. At last a new strategy of speed loop is proposed.We discussed the performances of the stator flux estimation model. The flux estimation model based on voltage and current is used to estimate thestator flux in high speed region and low speed region respectively,The hardware of gate-motor system is designed using digital signalsprocessor(DSP) TMS320F240 and intelligent power module(IPM). Wediscussed the interferential source of the system and the anti-interferencemethods respectively. The system develops the software in common currencyand practicality , which is designed by a modularizing way.The speed sensorless techniques for DTC system are very fascinating andchallenging subjects recently, they are received wide attention in the literature.Some brief description is provided. The proposed approaches are based onspeed model of DTC, motor reference adaptive control, the instantaneousreactive power of motor and the extended Kalman filter. Also the model andits system constitute have been made.