Verfahren zur Regelung von Elektromotoren

摘要

The invention relates to a device and method for determining the position of a movable motor part (40) with regard to a stationary motor part (10) of a linear motor. In order to determine position, a row of magnetic field sensors (60) are provided on the moveable motor part (40) that sense the magnetic field of permanent magnets (20) in order to determine a position value therefrom. The magnetic field sensors (60) are preferably situated at a distance from one another that differs from the distance between the permanent magnets (20) so that the magnetic field sensors output signals with different phases, which can be utilized for increasing the precision of the position determination ( Nonius principle ). In addition or alternatively, the stationary motor part (10) supports a magnetic track (30) on which position information or information concerning commutation can be coded. The magnetic track is read by a reading head (not depicted) on the movable motor part (40). The invention also relates to a method for determining the speed in an increment signal transmitter. The invention provides that clock signals of a clock generator between two increment signals are to be counted and to be correlated with the distance that corresponds to the increment signals. This procedure makes is possible to prevent the controller from executing an incorrect control at low speeds. This can occur if no increment signals are generated within a fixed measuring time which could be interpreted as speed 0 by the controller.