Abstract: A method and a device for operating an electrical machine having separate excitation, especially a synchronous machine. With the aid of a sensor system, a variable characterizing a rotor temperature and/or a stator temperature are/is determined, and an excitation current and stator currents for the electrical machine are specified by a control unit as a function of the variable characterizing the rotor temperature and/or the stator temperature, at least in specifiable operating ranges.

Abstract: A circuit arrangement for de-exciting an excitation winding of a synchronous machine in the event of a fault, including a control circuit for controlling a current flow through the excitation winding, it being possible to apply a positive control voltage to the excitation winding for excitation and a negative control voltage for rapid de-excitation, and including a protective circuit which is parallel-connected to the excitation winding and which does not permit a current flow over the protective circuit in the event of rapid de-excitation and which forms a current path for limiting the voltage and de-exciting the excitation winding if at least one connecting line between the control circuit and the excitation winding is interrupted.

Abstract: A method and a device for operating an electrical machine having separate excitation, especially a synchronous machine. With the aid of a sensor system, a variable characterizing a rotor temperature and/or a stator temperature are/is determined, and an excitation current and stator currents for the electrical machine are specified by a control unit as a function of the variable characterizing the rotor temperature and/or the stator temperature, at least in specifiable operating ranges.

Abstract: A circuit arrangement for de-exciting an excitation winding of a synchronous machine in the event of a fault, including a control circuit for controlling a current flow through the excitation winding, it being possible to apply a positive control voltage to the excitation winding for excitation and a negative control voltage for rapid de-excitation, and including a protective circuit which is parallel-connected to the excitation winding and which does not permit a current flow over the protective circuit in the event of rapid de-excitation and which forms a current path for limiting the voltage and de-exciting the excitation winding if at least one connecting line between the control circuit and the excitation winding is interrupted.

Abstract: An energy supply system has a number of DC choppers for converting the input voltages applied in each case into output voltages, and a number of energy storages for providing the input voltages, an energy storage being assigned to each DC chopper. An output voltage of at least one of the number of DC choppers is settable as a function of a setpoint input in order to expose the energy storage assigned to the at least one DC chopper to a load individually.

Abstract: A method for controlling the drive power distribution in a motor vehicle with hybrid drive by controlling the drive power distribution of torques of an internal combustion engine and an electric motor on a common drive train of a motor vehicle with hybrid drive. The conversion of a reference moment to an actual moment takes place almost without delay, in the case of a load point shift and/or in the case of a change in the moment desired by the driver. The delay in the conversion of reference moments into actual moments is calculated in advance by means of a control device, and the electric motor is controlled by the control device in such a manner that the torque differences that occur due to the delay of the internal combustion engine are balanced out by the electric motor.

Abstract: A method for controlling the drive power distribution in a motor vehicle with hybrid drive by controlling the drive power distribution of torques of an internal combustion engine and an electric motor on a common drive train of a motor vehicle with hybrid drive. The conversion of a reference moment to an actual moment takes place almost without delay, in the case of a load point shift and/or in the case of a change in the moment desired by the driver. The delay in the conversion of reference moments into actual moments is calculated in advance by means of a control device, and the electric motor is controlled by the control device in such a manner that the torque differences that occur due to the delay of the internal combustion engine are balanced out by the electric motor.

Abstract: Process and device for controlling the drive of a conveyor system (10), specifically in the form of an escalator or passenger conveyor, which can be switched from load to no-load operation, comprising a drive motor (26) and a variable frequency converter (42), which is at least controllable with respect to the frequency of its output voltage, wherein, under load, the drive motor (26) is supplied with a line voltage with an essentially constant line frequency and, at no-load, is supplied the output voltage of the variable frequency converter's (42), wherein, prior to a changeover from no-load to load operation, the output frequency of the variable frequency converter (42) is essentially brought with phase accuracy to the line frequency by means of a PLL device (30), and wherein this changeover is brought about as soon as this phase conformance has been realized.

Abstract: Method for controlling the drive of a conveyor device (10), especially in the form of an escalator or moving sidewalk, switchable between load operation and no-load operation, having a drive motor (26) and a frequency changer (42) controllable at least with respect to frequency and phase position of its output voltage, in which the drive motor (26) in load operation is fed with a line voltage with essentially constant line frequency and in no-load operation with the frequency changer output voltage, the phase difference between the phase position of the line voltage and the phase position of the frequency changer output voltage is determined, the phase position of the frequency changer output voltage is corrected according to the determined phase difference and therefore essentially brought into agreement with the phase position of the line voltage and switching is produced as soon as this agreement is reached.

Abstract: A method of controlling the drive of conveyor installation which includes a drive motor (26) and a frequency converter (42) whose output is adjustable, between a load operation and an idle mode, in the form of an escalator (10) or a moving sidewalk, where: in the load operation mode drive motor (26) is supplied with a line voltage at an essentially constant line frequency (fNetz), and in the idle mode with an output voltage of the frequency converter (42); the line voltage and the frequency converter's output voltage are compared with respect to frequency and phase position; the frequency converter (42) is set for an output frequency which has a predetermined spacing (&Dgr;fup, &Dgr;fdown) from the line frequency (fNetz); a demand to switch modes is signalled by a conveyance signal generator (48); and at the point in time (t1, t4), after a demand to switch modes has been signalled, when the output frequency of the converter (42) has reached the predetermined frequency spacing (&Dgr;fup, &Dgr;fdown) from

Abstract: Transport system (2), comprising a controller, a drive motor and a safety switch (18) that is connected to a safety-related part (8, 10) of the transport system (2) and is able to distinguish between a safe state of the transport system (2) and an unsafe state of the transport system (2), where the safety switch is connected to the controller in order to interrupt the power to the drive motor in an unsafe state, characterized by the fact that the safety switch (18) is realized so that it is able to also detect a warning state in addition to the safe state and the unsafe state.

Abstract: Process and device for controlling the drive means of a conveyor system 10, specifically in the form of an escalator or passenger conveyor, which can be switched from load to no-load operation, comprising a drive motor 26 and a variable frequency converter 42, which at is least controllable with respect to the frequency of its output voltage, wherein, under load, the drive motor 26 is supplied with a line voltage with an essentially constant line frequency and, at no-load, is supplied the output voltage of the variable frequency converter's 42, wherein, prior to a changeover from no-load to load operation, the output frequency of the variable frequency converter 42 is essentially brought with phase accuracy to the line frequency by means of a PLL device 30, and wherein this changeover is brought about as soon as this phase conformance has been realized.

Abstract: Method for controlling the drive of a conveyor device (10), especially in the form of an escalator or moving sidewalk, switchable between load operation and no-load operation, having a drive motor (26) and a frequency changer (42) controllable at least with respect to frequency and phase position of its output voltage, in which the drive motor (26) in load operation is fed with a line voltage with essentially constant line frequency and in no-load operation with the frequency changer output voltage, the phase difference between the phase position of the line voltage and the phase position of the frequency changer output voltage is determined, the phase position of the frequency changer output voltage is corrected according to the determined phase difference and therefore essentially brought into agreement with the phase position of the line voltage and switching is produced as soon as this agreement is reached.

Abstract: Transport system (2), comprising a controller, a drive motor and a safety switch (18) that is connected to a safety-related part (8, 10) of the transport system (2) and is able to distinguish between a safe state of the transport system (2) and an unsafe state of the transport system (2), where the safety switch is connected to the controller in order to interrupt the power to the drive motor in an unsafe state, characterized by the fact that the safety switch (18) is realized so that it is able to also detect a warning state in addition to the safe state and the unsafe state.

Abstract: A method of controlling the drive of conveyor installation comprising a the drive motor (26) and a frequency converter (42) whose output is adjustable, between a load operation and an idle mode, in the form of an escalator (10) or a moving sidewalk, where: in the load operation mode the drive motor (26) is supplied with a line voltage at an essentially constant line frequency (fNetz), and in the idle mode with an output voltage of the frequency converter (42); the line voltage and the frequency converter's output voltage are compared with respect to frequency and phase position; the frequency converter (42) is set for an output frequency which has a predetermined spacing (&Dgr;fup, &Dgr;fdown) from the line frequency (fNetz); a demand to switch modes is signalled by a conveyance signal generator (48); and at the point in time (t1, t4), after a demand to switch modes has been signalled, when the output frequency of the converter (42) has reached the predetermined frequency spacing (&Dgr;fup, &Dgr;fdown) from t

Abstract: An escalator safety system monitors a variety of sensors, contacts, and switches over an electronic safety bus. A plurality of bus nodes are distributed throughout the escalator system and are in constant communication with the bus master over the safety bus. The bus nodes interface with sensors, switches, contacts, detectors, components, and other safety equipment of the escalator system at each location and provide status information back to the bus master. The bus master preferably includes a microprocessor which upon sensing an unsafe condition, sends control signals to an escalator control and a drive and brake system to arrest the escalator in a safe manner.

Abstract: A sonic position sensing system for measuring the position of an object, such as an elevator, includes transmitting a sonic signal along a conductor by a transmitter; receiving said sonic signal at a first receiver, located a first distance along said conductor from said transmitter; receiving said sonic signal at a second receiver located a second distance from said transmitter and on an opposite side of said transmitter from said first receiver; calculating a first distance between said transmitter and said first receiver; calculating a second distance between said transmitter and said second receiver; and calculating a total measured distance between said first receiver and said second receiver as the sum of said first distance and said second distance as the sum of said first distances and said second distance. The first or second distances may be scaled by the total measured distance to compensate for temperature effects. The position may also be corrected for velocity and/or acceleration of the object.