A position sensor (28) detects the position of the output shaft (15).

A position calculator determines the position of the shaft within the range of rotary movement of the shaft using the positions detected by the first and second detectors.

Sensor rings continually monitor the common shaft's position.

The correction signal depends on N sensors for every position of the shaft.

In an embodiment, the phase position between the magnetic field driving the motor shaft and the position of the motor shaft is maintained constant despite change of the load.

The position of the motor shaft (426) is located using a sensor.

The rotation angle or the position of the motor shaft is obtained by the controller.

Feedback from the sensor enables the control circuit to control the position of the output shaft, and the control circuit can also output data relating to the position of the output shaft.

The unbalanced shaft (2) of an individual exciter (3) can be rotationally driven by a hydraulic motor (4).

The position of the unbalanced shaft (2) is determined in at least one position by a position indicator (7).

The aim of the invention is to provide a method for synchronised ignition which does not require a camshaft sensor.

A pump stroke position is determined from the position of the pump element relative to the position of the shaft of the electric motor.

By monitoring the error register (35-1), the position of the injection shaft is detected, and the number of revolutions of the screw (2) corresponding to the position of the injection shaft 2'' is obtained by utilizing the override function.

Further, the position changing operation is an operation to change the position of the rotary shaft with respect to the flap body (31).

At the maximum speed or at a speed near the maximum speed of the crankshaft (130), the control section (150) causes the position of the shaft of the eccentric plate (250) to be aligned with the position of the axis of the rotating shaft.