Abstract: An electric control (1) for electric devices (2), in particular electromotive drives, which can trigger dangerous motions, is provided with an emergency-off switch (4), having at least two channels for a power supply, allowing one or more electric devices (2) to be connected at the outlet side. One safety unit (3) is provided with at least one connector (5) for a power supply as well as at least two outlets (6, 7) for connecting one channel (A, B) each of the emergency-off switch (4). The safety unit (3) has at least two switches (8, 9) connected to the outlets (6, 7), via which the power supply is conducted and switched on and off alternately. Furthermore, a measuring device (10) is provided for controlling at least the supply power pulses at the outlets (6, 7) of the safety unit (3) and/or at the outlets of the emergency-off switch (4) and/or at one or more electric devices (2) connected to the emergency-off switch (4).

Abstract: A measuring device for measuring an electrical current has an alternating-current converter (6) that possesses a primary inductance and an ohmic secondary resistance (RS) and whose output is connected across a measured-value signal conditioning device to a measurement output for a current measuring signal. The output of the alternating-current converter (6) has an ohmic secondary resistance (RS). An active compensation circuit, which at least partially compensates for the voltage drop caused by a current flow in the secondary resistance (RS) at the primary inductance by applying a voltage at the output of the alternating-current converter (6), is disposed between the output of the alternating-current converter (6) and the measurement output.

Abstract: The invention relates to a method for measuring the output current of a clocked half-bridge circuit (1) in which semiconductor switches (5a, 5b) located in half-bridge sections (2a, 2b) are alternatingly opened or closed in push-pull operation and thereby cause an alternating current in an output current circuit. The current flowing through a first semiconductor switch (5a) is measured. The current flowing through a first semiconductor switch (5a) is transformed inductively into a secondary current. At least two measured-value signals are generated for the secondary current, of which a first measured-value signal corresponds to the secondary current when the first semiconductor switch (5a) is closed, and a second measured-value signal corresponds to the secondary current when the first semiconductor switch (5b) is open.

Abstract: In a process for operating an electric device (1), especially an electric motor drive, an electric consumer (6) is fed from an a.c. network in that the input alternating voltage that is rectified and the intermediate circuit voltage so obtained is applied to the half bridges of a bridge circuit. Each of the half bridges has two bridge arms (7a, 7b) in which in any given case at least one semiconductor switch (8a, 8b) is arranged, to which control signals are applied through an actuation circuit (9a, 9b) fed from an auxiliary supply voltage source (16). Each of the bridge arms is connected to one of the poles (4) of the intermediate circuit voltage (5), and a test shutdown of the auxiliary supply voltage is applied to the actuation circuit (9a, 9b) of this semiconductor switch (8a, 8b) during a non-actuation phase of the semiconductor switch (8a, 8b) arranged in the relevant bridge arm.

Abstract: In a process for operating an electronically commutated electric motor (2), a signal value signal for the commutation position of the rotor of the electric motor (2) is readied, and the windings of the electric motor (2) are supplied with current such that the rotor of the electric motor (2) is positioned on the commutation position specified by the standard value signal. A measuring signal for the position of the rotor of the electric motor (2) is recorded, evaluated and compared with the standard value signal for the commutation position. The current supply of the windings of the electric motor (2) is interrupted if the position measuring signal and/or the standard value signal for the commutation position exceed a specified highest value, and/or if the differential signal between the position measuring signal and the standard value signal for the commutation signal lie outside a specified tolerance range.

Abstract: An electric motor (1) or drive motor has a cylindrical, possibly, however, even conical or disk-shaped rotor (2) and a cavity or interior space (4) surrounded by the rotor (2) and/or its stator (3), into which protrudes in the installed position an epicyclic gear system (5) or planetary gear system which is driven by the electric motor (1). The electric motor (1) has a toothed power output element, for example, a cantilevered gear shaft (6), with which meshes an opposing-teeth-exhibiting power input element, for example, the planetary gears (7) of the epicyclic gear system (5).

Abstract: In a process for operating an electric device (1), especially an electric motor drive, an electric consumer (6) is fed from an a.c. network in that the input alternating voltage that is rectified and the intermediate circuit voltage so obtained is applied to the half bridges of a bridge circuit. Each of the half bridges has two bridge arms (7a, 7b) in which in any given case at least one semiconductor switch (8a, 8b) is arranged, to which control signals are applied through an actuation circuit (9a, 9b) fed from an auxiliary supply voltage source (16). Each of the bridge arms is connected to one of the poles (4) of the intermediate circuit voltage (5), and a test shutdown of the auxiliary supply voltage is applied to the actuation circuit (9a, 9b) of this semiconductor switch (8a, 8b) during a non-actuation phase of the semiconductor switch (8a, 8b) arranged in the relevant bridge arm.

Abstract: In a process for operating an electronically commutated electric motor (2), a signal value signal for the commutation position of the rotor of the electric motor (2) is readied, and the windings of the electric motor (2) are supplied with current such that the rotor of the electric motor (2) is positioned on the commutation position specified by the standard value signal. A measuring signal for the position of the rotor of the electric motor (2) is recorded, evaluated and compared with the standard value signal for the commutation position. The current supply of the windings of the electric motor (2) is interrupted if the position measuring signal and/or the standard value signal for the commutation position exceed a specified highest value, and/or if the differential signal between the position measuring signal and the standard value signal for the commutation signal lie outside a specified tolerance range.