Abstract: The invention relates to a method and to a circuit arrangement used to regulate synchronous linear motors, especially linear drive mechanisms in film drawing systems. The force (Fclip) between the stationary primary part and the moved secondary part is determined in a sensorless manner from the voltages and currents calculated and measured in a frequency converter in a functional block, in such a manner that the integral is calculated from the active power during a time period (tclip) between two pulses (new—clip) produced by an overriding control and said integral is divided by the active length (1zone) of the primary part. Alternatively, the force (Fclip) can also be determined by summation of the voltages in the f-axis in order to reduce the drop in voltage in relation to the resistance (Rstr) of the branch in the primary part. Voltages and currents are transformed on the primary part by a co-ordinate system related to the secondary part.

Abstract: The invention relates to a method and to a circuit arrangement used to regulate synchronous linear motors, especially linear drive mechanisms in film drawing systems. The force (Fclip) between the stationary primary part (20) and the moved secondary part (30) is determined in a sensorless manner from the voltages and currents calculated and measured in a frequency converter (10) in a functional block (11), in such a manner that the integral is calculated from the active power during a time period (t,clip) between two pulses (new_clip) produced by an overriding control and said integral is divided by the active length (lzone) of the primary part (20). Alternatively, the force (Fclip) can also be determined by summation of the voltages in the f-axis in order to reduce the drop in voltage in relation to the resistance (Rstr) of the branch in the primary part (20). Voltages and currents are transformed on the primary part (20) by a co-ordinate system related to the secondary part (30).

Abstract: An improved arrangement for operating a contact roller (7) and an associated method, characterized inter alia by the following features: a linear motor drive (14) is allocated to the contact roller (7) in order to change positon; a force adjustment device (400) is provided for the linear motor drive (14); a suitable sensor is also provied in order to determine speed or acceleration.

Abstract: An improved arrangement for operating a contact roller (7) and an associated method, characterized inter alia by the following features: a linear motor drive (14) is allocated to the contact roller (7) in order to change positon; a force adjustment device (400) is provided for the linear motor drive (14); a suitable sensor is also provied in order to determine speed or acceleration.

Abstract: An improved apparatus for adapting speed, in particular for nippers (1) which can be made to travel along a rail arrangement (3), is distinguished by the following featuresa rotating and electrically conductive eddy-current body (17), preferably designed in the form of an eddy-current wheel or an eddy-current cylinder, is provided,the guide rail arrangement (3) runs at least over and away from a partial region of the eddy-current body (17) with a tangential component,on the carriages (1) which can be made to travel along the guide rail arrangement (3) there is provided or can be excited at least one magnet (7a, 7b), which is arranged on the side facing the eddy-current body (17) and, in the region of the eddy-current body (17), can be moved over and away from the eddy-current body (17), with an air gap being formed.

Abstract: A magnetic tenter lever actuating device includes a coupling rail, preferably designed in the form of a pole shoe rail (21), by means of which the end of a tenter lever (3) can be pivoted deliberately from its open into its closed position and vice versa by means of a coupling region (29) formed at the end.