Abstract: An electromotive adjustment device for adjusting a control element includes a housing and a gear mechanism which has a plurality of intermeshing gear wheels to define a drive train. In driving relationship with the gear mechanism is a drive motor which is constructed as a brushless motor with an external rotor and includes an output journal, whereby the output journal has a tooth portion in engagement with a helical spur gear wheel of the gear mechanism.

Abstract: An adjustment drive includes a drive motor, and a drive train in driving relationship with the drive motor for reducing a motor speed of the drive motor. The drive train includes a plurality of gear wheels operated by the drive motor and intermeshing with one another to form a chain to define at least one gear stage, whereby at least the plurality of gear wheels is supported by a carrier that defines thereby a separate drive unit.

Abstract: An electromotive servo drive includes a drive motor, a drive train, which is fitted with an output member and includes at least one gear stage for reducing the rotation speed of the motor, and a rotatable hand-operated adjusting shaft for adjusting the output member of the drive train such that at least the drive train, arranged between the adjusting shaft and the output member, is self-locking. One of the gear stages is fitted with a brake element such that the part of the drive train leading from the gear stage to the output member is prevented from returning, while the hand-operated adjusting shaft can freely rotate in both directions of rotation. The brake element is a wrap spring which is rotatably supported in a bushing, and an inner control part engages the wrap spring to couple both angled ends of the wrap spring such that the wrap spring can be expanded in order to obtain a braking effect in a rotation direction.

Abstract: An electromotive adjustment device for adjusting a control element includes a housing and a gear mechanism which has a plurality of intermeshing gear wheels to define a drive train. In driving relationship with the gear mechanism is a drive motor which is constructed as a brushless motor with an external rotor and includes an output journal, whereby the output journal has a tooth portion in engagement with a helical spur gear wheel of the gear mechanism.

Abstract: An adjustment drive includes a drive motor, and a drive train in driving relationship with the drive motor for reducing a motor speed of the drive motor. The drive train includes a plurality of gear wheels operated by the drive motor and intermeshing with one another to form a chain to define at least one gear stage, whereby at least the plurality of gear wheels is supported by a carrier that defines thereby a separate drive unit.

Abstract: An electromotive servo drive includes a drive motor having an external rotor and a drive train in driving relationship with the drive motor and having an output member operatively connected to a control element to be adjusted. A locking device having a brake element is movable between a release position in which the rotor is free to rotate and an operative position in which the rotor is locked in place. Operatively connected to the brake element is a reset spring for maintaining the rotor at a standstill, when the reset spring is under tension, wherein the reset spring is tensioned by turning an actuating shaft by hand.

Abstract: An adjustment device for adjusting a control element of a flap valve in heating, ventilating and air-conditioning systems includes a drive motor, and a drive train in driving relationship with the drive motor. The drive train has an output member which is connected to a control element to be adjusted. A recorder is provided for recognizing and/or adjusting a position of the control element and/or a component of the drive train, wherein the recorder has a control member which is directly connected in form-fitting engagement with the output member of the drive train.