Abstract: A contactless electric control handle having a field coil for forming an electro-magnetic field, inductive pick-up coils angularly spaced apart around the axis of the field. The rod of the control handle constitutes the core of the field coil. The field coil and the pick-up coils have the shape of annular, concentric conductors, whereas ferrite is applied to the rod in order to employ high frequencies up to 1 MHz.

Abstract: Contactless, electric control-handle comprising a field coil provided with a core for producing an alternating, electro-magnetic field, pairwise series connected, inductive pick-ups angularly spaced apart and each having a core, and an actuating-rod subjected to a bias stress directed towards a neutral position and connected with a core of the field coil to affect the alternating, electro-magnetic field such that there is a linear relation between the displacement of the actuating rod and the output signal of the inductive pick-ups.

Abstract: A control system, more particularly for the electric motors driving a vehicle for the disabled, comprising a control member for delivering a required speed signal which varies linearly with the position of the control member, a feed back control circuit for each motor, a power supply for the motor and the control circuits, the linear speed signal is compared with a signal selected, on the basis of the instantaneous speed of the motor, to form a number of signal which are stored in a memory, and for forming a control signal which does not vary linearly with the speed signal. The control signal is fed to the motor control circuit to keep the rotation of the motor constant.

Abstract: A system is provided for passing products to be treated through a machine having a driving motor, a plurality of supporting rollers driven by said motor and a regulating circuit for controlling the motor, said driving motor being a step motor and the regulating circuit including a constant oscillator and a frequency divider, the input of which is connected to the oscillator and the rectangular output of which drives the step motor and an adjusting element for adjusting the frequency divider.

Abstract: A device for regulating the current in a load includes a voltage-frequency converter for direct proportionally converting a voltage proportional to the load current into a number of pulses per time unit; a counter and a memory with a corresponding indicator for repetitively storing and displaying a number of pulses counted during a measuring interval; a nominal value control with corresponding indicator, a limit value control, and a comparator and a regulating unit by which the memory contents corresponding to said measuring interval are continuously compared with the lower limit and upper limit value superimposed on the nominal value such that upon exceeding one of these limit values the voltage for the load is adjusted.