Abstract: The invention concerns a method for controlling a drive (5) for a leaf (1), in particular for a door leaf or a window leaf, including the following steps: Measuring a measured value (vr) of a kinetic quantity of the leaf (1), comparing the measured value (vr) with a tolerance range (TB) of a reference travel curve (SFK), driving the leaf (1) by the drive (5) according to the reference travel curve (SFK). Upon the measured value (vr) leaving the tolerance range (TB), the leaf (1) is set to a freewheel (FL) in which the drive (5) is suspended.

Abstract: A drive for a rotatable wing, the drive including an electric motor, a transmission, an output shaft, which is coupled to the electric motor by means of the transmission and can be coupled to the wing in order to move the wing between a closed position and an open position by means of the electric motor, and a force device for applying a force to the output shaft. The drive can have a compact design in that the force on the output shaft produces a torque that has a threshold value which must be overcome in the currentless state of the electric motor in order to move the wing from the closed position to the open position and that disappears in the open position of the wing, and/or in that the force device has a spring arranged transversely to the axis of the drive shaft of the electric motor and transversely to the axis of the output shaft.