Liebherr-elektronik Gmbh

Nejat Mahdavi

Alfred Engler

Ralf Cremer

Erich Riedisser

Pierre Brodeau

Rodolphe De Maglie

Christian Thuerigen

The disclosure relates to an electrical drive system for a work machine, in particular a mining truck, having at least two electrical drive motors that can each be regulated independently of one another via an associated inverter, wherein the drive system has a DC voltage power supply for the energy supply of the at least two drive motors, characterized in that at least one voltage divider is arranged in parallel with the DC voltage power supply whose partial voltages can be provided at the DC voltage inputs of the at least two inverters.

Electrical drive system for a work machine having two electric motors that can be regulated independently of one another

The present disclosure relates to a solid state power controller, comprising: a power switch for interrupting a line; a current sensor for measuring a current flow on the line; and a control unit for controlling the power switch and that is configured to prevent a time-dependent overcurrent on the line on the basis of the current measured by the current sensor, wherein the control unit comprises a counter that is adapted to increment a count when the measured current is larger than a threshold value and to decrement the count when the measured current is smaller than the threshold value; and wherein the power switch is adapted to interrupt the line when the counter reaches or exceeds a predefined count.

Solid state power controller having semi-analog overcurrent protection

The invention relates to a drive circuit for an electric motor having an aerodynamic bearing of the motor shaft, wherein the drive circuit comprises at least one storage means for storing electrical energy by which the electric motor can be fed with electrical energy on a failure of the supply voltage or DC-link voltage to obtain a minimum speed of the motor shaft required for the air support at least at times.

Drive circuit for an air bearing motor

The present disclosure relates to a position measuring device for a fluidic cylinder, which includes a cylinder jacket and a piston rod longitudinally movable in the cylinder jacket, wherein the position measuring device includes an evaluation unit which determines the position of the piston rod with respect to the cylinder jacket with reference to the intrinsic capacitance of the capacitor formed by cylinder jacket, piston rod and a dielectric fluid acting as a dielectric.

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Lindau, Germany

Nejat Mahdavi