| 摘要 |
The invention relates to a door drive for an automatic door having a door panel, a brushless electric motor for generating the drive power and a belt or chain running in the opening and closing direction of the door for transmitting the drive power to the door panel. The door position is affected by a door position controller. An actuation device for controlling and/or regulating the electric motor includes an angle sensor for generating an angular signal proportional to the angle of rotation of the motor and a commutation circuit, for electronically commutating the motor, where the angular signal from the angle sensor is fed. The angular signal is also used as an input variable to the door position controller. The angle sensor is, in particular, an absolute value angle sensor working on a magnetic principle and designed for the unambiguous sensing of one complete revolution of the electric motor.
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