| 摘要 |
The controller has an arrangement for varying the torque of a motor to intermediate values or a null setting during lowering or raising of the door (1). The motor torque is controlled according to the torque demand for the door. The instantaneous torque acting on the door or motor, or the revolution rate of the door drive shaft or drive motor is measured and used to control the torque. An incremental transducer associated with the motor shaft is used for drive motor speed measurement. |
