Abstract: A first inverter and a second inverter supply two coil sets forming a three-phase motor with AC voltages, which are the same in amplitude but shifted by 30° in phase. Current detectors detect phase currents supplied from the inverters to the coil sets. Temperature estimation sections estimate temperatures of the inverters or the coil sets based on an integration value of the phase current detection values. A current command value limitation section limits upper limits of current command values of both coil sets based on the estimated temperatures Tm1 and Tm2. Thus, the inverters and the coils sets are protected from overheating without increasing torque ripple.

Abstract: A method and apparatus are provided for ripple suppression of brushless DC motors at any given velocity irrespective of the limited bandwidth of the driver/amplifier supplying the excitation currents to the stator. In a preferred embodiment, Fourier coefficients of the current waveform are calculated as a function of rotor velocity by taking into account the driver/amplifier's finite bandwidth dynamics. For a given velocity, Fourier coefficients of the series approximating the waveform (control signal) are calculated as a function of the rotor velocity and the amplifier dynamics, to generate a waveform that results in no torque or velocity pulsations. When changing the motor speed, the coefficients are updated (recalculated) based on the new desired velocity (and amplifier dynamics), resulting in generation of an updated waveform that results in no torque or velocity pulsations at the new motor speed.

Abstract: The invention relates to methods and devices for monitoring and correcting a sensorless rotor position detection in permanently excited motors, comprising a control device and a current converter. The invention is especially characterised in that the ambiguity of the rotor position determined from the inductance ratios of the motor, in permanently excited motors, can be resolved in a simple manner without a sensor, and a defectively determined angle can be corrected as required. To this end, during the operation of the motor, the rotor position is detected by means of an inductance-based detection device. Furthermore, the rotor position is monitored in relation to the ambiguity of the inductance-based signals by means of a monitoring/correcting device, and where necessary, an occurring angle error corrected, the currents in the motor being modified.

Abstract: A method for controlling a discharge pump of a household appliance, including starting a synchronous electric motor that actuates said discharge pump until the synchronism condition is reached, and driving said synchronous electric motor at a steady state through phase control by varying the firing angle (?). In driving said synchronous motor at steady state through phase control, said firing angle (?) is feedback controlled to cancel the phase difference between the mid-point of a zero current plateau of a function of the phase current fed to the electric motor and the zero-crossing point of a counter electromotive force signal (fcem) relative to the same phase. In feedback controlling the firing angle (?), the synchronous electric motor is switched off if the required firing angle (?) exceeds a maximum threshold (?lim), which may result from the operation of the discharge pump in air-water conditions.

Abstract: There are provided a power factor correction circuit capable of transferring extra power to a ground before performing switching for a power factor correction to thereby reduce a switching loss generated in switching for a power factor correction, and a power supply device and a motor driving device having the same. The power factor correction circuit includes: a main switch switching input power to adjust a phase difference between a current and a voltage of the input power; and an auxiliary switch switched on before the main switch is switched on, to thereby form a transmission path for extra power of the main switch.

Abstract: A trash can with a power operated lid can include a sensor assembly and a lifting mechanism. The sensor assembly can include at least one light emitter and at least one light receiver, the viewing area of the at least one light receiver being limited in size. The lifting mechanism can include a controller, a drive motor, and a lifting member. The trash can with power operated lid can further include at least one position sensor for detecting the position of the lid.

Abstract: According to an aspect of the invention, an apparatus includes: a spindle motor; and circuitry configured to spin up the spindle motor by increasing a command voltage in small steps while monitoring a current flowing through the spindle motor. According to another aspect of the invention, a method includes: spinning up a spindle motor from a stationary state to a target speed using a voltage mode of operation for the spindle motor, wherein the spinning up includes supplying to the spindle motor a series of multiple discrete voltage levels ranging from a first voltage level to a second voltage level; and maintaining the spindle motor at the target speed.

Abstract: A distributed motor drive system includes a power management module and multiple inverter modules integrated with the motors and located on a machine or process remote from the power management module. The power management module distributes DC voltage and command signals to each of the inverters, where the DC voltage is distributed between modules via a DC link cable. The integrated inverters execute switching routines to convert the DC voltage to an AC voltage suitable for controlling the motor. Each of the power management module and the inverters includes a portion of the DC bus. The current on the DC link cable is monitored and general bus utilization as well as overload conditions are reported.

Abstract: A control device (1) for controlling on-board equipment has a mount (5) having hinged thereto at least one drive lever (2) movable between two extreme positions, and also including a magnetic friction member (3) connected to the lever (2) and opposing resistance to movement thereof.

Abstract: A magnetic pole position detecting device includes a calculating unit for correcting a magnetic pole position detected by a magnetic pole position detecting unit. In this magnetic pole position detecting device, an additional phase is added to the magnetic pole position detected by the magnetic pole position detecting unit, in order to move a rotor. In relation to a movement amount before and after this movement, a movement amount detected by the magnetic pole position detecting unit is compared with a movement amount detected by an encoder. When a difference between them is larger than a predetermined threshold, a process of detecting the magnetic pole position is determined as false detection.

Abstract: Disclosed herein is a motor control apparatus and a method thereof. A phase error of the reference voltage output corresponding to a time delay caused by digital control may be compensated to stably control a motor, thereby improving the stability of a system. The phase compensation unit may be provided therein to convert a reference voltage of the synchronous coordinate system into a reference voltage of the stationary coordinate system when controlling the high-speed operation of the motor, thereby compensating a phase error of the reference voltage output, and allowing the motor to be operated at a high speed while maintaining its efficiency and reducing a volume of the compressor.

Abstract: A method for pulse width modulation control of a multiple phase drive includes identifying at least one phase from the plurality of phases for the drive as eligible for clamping to one of a plurality of extreme power supply voltages, selecting a phase of the eligible phases having a largest magnitude driving current, determining a first offset signal as a difference between a control signal level for the selected phase and an extreme control signal level corresponding to one of the extreme power supply voltages, limiting a rate of change of the first offset signal to form a second offset signal, and determining a modified control signal for each of the phases for the drive including forming for each of a plurality of the phases a combination of the second offset signal and a control signal level for the phase to determine the modified control signal for the phase.

Abstract: In a motor control unit, a current-carrying failure detection unit determines a first determination condition and a second determination condition. The current-carrying failure detection unit measures a duration of a state where the first determination condition is satisfied, and a duration of a state where the second determination condition is satisfied. When the first or second duration exceeds a predetermined reference period, the current-carrying failure detection unit determines that a current-carrying failure has occurred.

Abstract: An energy storage system of an apartment building, an integrated power management system, and a method of controlling the integrated power management system. Power may be efficiently consumed by supplying remaining power stored in an energy storage system of each apartment to a common load.

Abstract: A resonance type non-contact charging apparatus is disclosed. A charger of the apparatus receives the high frequency power from a secondary side resonance coil of the apparatus. A power ratio detecting section of the apparatus detects the ratio of the reflected power from a primary side resonance coil to the high frequency power source with respect to the output power from the high frequency power source to the primary side resonance coil. A stop control section of the apparatus stops the high frequency power source when the ratio detected by the power ratio detecting section becomes greater than or equal to a predetermined threshold value.

Abstract: An apparatus includes a detection unit configured to detect that a first power receiving apparatus is in a predetermined range and a second power receiving apparatus is in the predetermined range, a power supply unit configured to supply power to the first and the second power apparatuses if the first and the second power receiving apparatuses are in the predetermined range, an acquisition unit configured to acquire first information and second information, and a control unit configured to select one of the first and the second power receiving apparatuses based on the first and the second information if the first and the second power receiving apparatuses are in the predetermined range, wherein the control unit controls a selected apparatus to perform a predetermined process.

Abstract: An electronic device (200) and method (300) with rollable display is disclosed. The method (300) can include: providing (310) a rollable housing and a controller configured to control the operations of an electronic device, the rollable housing including a rolled position (402) and an unrolled position (212); locating (320) a conductive pattern in proximity to an edge portion of the rollable housing; and enabling (330) a wireless transaction when the rolled housing is scrolled in a rolled position. Advantageously, when in the rolled position (402), the device can be easily placed in proximity to a pad, for simple battery charging and/or data transfer.

Abstract: A method and a device are provided for the efficient charging of a vehicle battery of an electric vehicle by a charging station of a group charging station. The connected vehicle battery, starting from an initial charge state, is charged in accordance with a calculated charge priority value until the charge state of the vehicle battery reaches a selectable charge state. The calculated charge priority values of the vehicle batteries connected at the same time to the charging stations of the group charging station determine which batteries will be charged within a charging interval.

Abstract: Method and device for controlling charging stations for electrical vehicles. In order to minimize peak power demands in at least two charging stations 10 combined into a group 12, actual charging parameters are exchanged 32 within the charging stations 10 within the group 12, a load prediction for the group 12 is created 34 depending on at least the actual charging parameters, and setpoint charging parameters for the charging stations 10 of the group 12 are determined 38 depending on the load prognosis.

Abstract: A battery management system (BMS) for managing discharging of a plurality of battery cells is disclosed. The battery management system comprises a battery monitoring unit, for monitoring statuses of the plurality of battery cells; and a discharge control unit, for controlling the plurality of battery cells to output a plurality of output powers to a load according to the statuses of the plurality of battery cells.

Abstract: A battery balancing method and system which includes a plurality of cells connected in series, a balancer for each cell, a monitor configured to determine a state of charge (SOC) of each cell, and a microprocessor. The microprocessor iteratively calculates a SOC error for each cell, based on a theoretical balancing of the Min Q cell and the Max Q cell, until the SOC error is less than or equal to a first threshold; and iteratively re-calculates SOC error based on a net charge or discharge time for each balancer until the SOC error is less than or equal to a second threshold; and when the SOC error is less than or equal to the second threshold, instructs each balancer to physically balance each respective cell based on the respective calculated net charge or discharge time when the second threshold is met.

Abstract: The present invention relates, in general, to a charge equalization apparatus for batteries and, more particularly, to a charge equalization apparatus, in which the primary windings (M11 to M1N) of a number of transformers (T1 to TN) corresponding to the number of battery cells are connected in parallel with each other, a switch (S) for controlling the flow of current of the primary windings (M11 to M1N) of the parallel-connected transformers is connected in series with the parallel-connected primary windings, respective secondary windings (M21 to M2N) corresponding to the primary windings are connected in parallel with the battery cells, and the battery cells are connected in series with each other.

Abstract: In a battery pack, undesired current consumption is reduced during a shipping period to extend the charge keeping time of the battery pack. The battery pack includes at least one of battery cells, a charge switch, a discharge switch, and a microcomputer for controlling the charge switch and the discharge switch in accordance with a voltage of the battery cells. The battery pack has a shipping mode where the battery pack is shut down during the shipping period.

Abstract: Embodiments of the present invention include systems and methods of controlling power in battery operated systems. In one embodiment, the present invention includes a switching regulator for boosting voltage on a depleted battery to power up a system. The system may communicate with an external system to increase the current received from the external system. Embodiments of the present invention include circuits for controlling power received from external power sources such as a USB power source. In another embodiment, input-output control techniques are disclosed for controlling the delivery of power to a system or charging a system battery, or both, from an external power source.

Abstract: According to one exemplary embodiment, a multi-mode power management unit (PMU) includes a number of switchable conductive paths, where each of the switchable conductive paths corresponds to at least one of a number of power modes. The multi-mode PMU further includes a shared inductor residing in each of the switchable conductive paths. A current can flow through the shared inductor in a same direction in each of the power modes. The multi-mode PMU further includes a controller configured to set one of the power modes using one of the switchable conductive paths. The power modes can include a battery-to-electronic system power mode and a charge-battery power mode. The power modes can further include a battery-to-electronic system/camera flash power mode, a power port-to-electronic system/battery power mode, and a battery-to-electronic system/backlight LED power mode.

Abstract: A battery charging system includes a pre-charge control circuit for electrically coupling a plurality of power supply terminals to a plurality of load terminals. The pre-charge control circuit includes a plurality of switching elements for selectively coupling at least one of the plurality of power supply terminals and one of the plurality of power supply using one of a pre-charge current path and a standard charge current path. The pre-charge current path includes at least one pre-charge resistor in series with a positive temperature coefficient (PTC) resistor.

Abstract: In a control apparatus for an inverter generator having a first, second and third windings wound around an alternator driven by an engine, and first, second and third inverters adapted to convert alternating current outputted from the first, second and third windings into direct current and invert the converted direct current into single-phase alternating current in a desired frequency so as to supply to the electric load, there is provided with an actuator (stepper motor) to open and close a throttle valve of the engine, and it is configured to detect output powers (effective powers) of the first, second and third inverters, to determine a target engine speed based on the detected output powers, and to control an operation of the actuator so that the engine speed converges at the determined target engine speed.

Abstract: A switching power supply is provided to supply an AC input voltage. The supply includes a control circuit configured to detect a voltage of the AC power source in a voltage waveform, and switch elements in a synchronous rectification switching mode in synchronization with polarities of the voltage waveform when the AC input voltage is equal to or greater than a predetermined voltage value. The control unit also operates the switching without synchronization with the polarities when the AC input voltage is smaller than the predetermined voltage value.

Abstract: A bridgeless PFC (power factor correction) converter with improved efficiency is disclosed. The bridgeless PFC converter comprises: a first input terminal and a second input terminal configured to receive an input AC signal; an output terminal; an inductor set comprising N inductors, wherein a first terminal of each inductor is coupled to the first input terminal; and an output stage comprising (N+1) switching circuits coupled between the output terminal and a ground node.

Abstract: A controlled power supply comprising: a) an array of low voltage current sources; b) a plurality of switch power supplies coupled to each of the storage capacitors and respective ones of the pulse loads being coupled to each of the switch power supplies; c) each of the storage capacitors being configured for storing energy during an inactive portion of a load switching cycle of the respective switch power supply to which the corresponding storage capacitor is coupled when the pulse loads are inactive; d) a respective output capacitor in association with each of the switch power supplies for feeding voltage to the respective pulse loads during an active portion of the load switching cycle; and e) the respective storage capacitor being configured for supplying the stored energy via the respective to the respective switch power supply to which the storage capacitor is coupled to each of the pulse loads coupled to switch power supply during an active portion of the load switching cycle.

Abstract: The present solution relates operation of a power conversion device (200, 500). A first gate (205, 505) is operated (901) to provide a voltage pulse (309,609) travelling from an input (201,501) to a wave propagation medium (105) through the first gate (205,505). The voltage pulse has duration (307,607) less than the propagation time through the medium (105) to one end of the medium (105) and back to the input (201,501). The pulse generates a reflected wave. The first gate (205,505) is operated (902) periodically providing a voltage pulse in synchronization with the reflected wave to accumulate the reflected wave travelling in the medium (105), performing the accumulation through an accumulation interval (303,603). A second gate (207,507) is operated (903) periodically to provide a discharge pulse (312,612) in synchronization with the reflected wave to discharge the wave travelling in the medium (105), performing the discharge through a discharge interval (310,610).

Abstract: A voltage regulator circuit includes a transistor and a capacitor. The transistor includes a gate, a source, and a drain, a first signal is inputted to one of the source and the drain, a second signal which is a clock signal is inputted to the gate, an oxide semiconductor layer is used for a channel formation layer, and an off-state current is less than or equal to 10 aA/?m. The capacitor includes a first electrode and a second electrode, the first electrode is electrically connected to the other of the source and the drain of the transistor, and a high power source voltage and a low power source voltage are alternately applied to the second electrode.

Abstract: A power supply controller includes: a controlling section that, upon determination that no anomaly has occurred, causes a semiconductor switch to execute turning on and, upon determination that the anomaly has occurred, causes the semiconductor switch to maintain an off state; a monitoring section that monitors which condition the controlling section is in, the condition being normal or anormal; and a switching section that, upon monitoring result by the monitoring section indicating the normal condition, causes turning on and off of the semiconductor switch by the controlling section and, upon the monitoring result indicating the anormal condition, causes turning on and off of the semiconductor switch with an external on-off command signals.

Abstract: Provided is a voltage regulator capable of reducing an influence of an offset to obtain an accurate output voltage. The voltage regulator includes: a first stage amplifier for amplifying and outputting a difference between a reference voltage and a divided voltage obtained by dividing a voltage output by an output transistor, to thereby control a gate of the output transistor; and a cascode amplifier circuit, in which the first stage amplifier includes: a first high breakdown voltage NMOS transistor as an input transistor; and an NMOS transistor as a tail current source, and in which the cascode amplifier circuit includes a second high breakdown voltage NMOS transistor as a cascode transistor.

Abstract: A reference voltage generation circuit includes: a bandgap reference circuit, generating a plurality of initial currents with different temperature coefficients; a base voltage generation circuit, combining the initial current into a combined current, and converting the combined current into one or more base voltages; a bias current source circuit, generating one or more bias currents based on at least one of the initial currents; and one or more regulating output circuit, each converting a respective one of the one or more bias currents into an increment voltage and adding the increment voltage to the base voltage to generate a respective output voltage. Each output voltage may have its respective temperature coefficient.

Abstract: An error amplifier includes a first amplification circuit with a reference signal input and a feedback signal input representing the amplitude of a load voltage of a switched mode power supply. The error amplifier includes a difference amplifier providing a difference signal representing a difference between the reference signal and the feedback signal, provided for determining the duty cycle of a switching signal in the switched mode power supply. The first amplification circuit further includes a control circuit providing a control signal generated as a function of the difference between the reference signal and the feedback signal. The error amplifier also includes a second amplification circuit, included in a compensation circuit. The second amplification circuit receives the control signal, and the operating current of the second amplification circuit is adjusted by an amount indicated by the control signal.

Abstract: A method of operating a voltage regulator circuit includes generating a control signal by an amplifier of the voltage regulator circuit. The control signal is generated based on a reference signal at an inverting input of the amplifier and a feedback signal at a non-inverting input of the amplifier. A driving current flowing toward an output node of the voltage regulator circuit is generated by a driver responsive to the control signal, and the driver is coupled between a first power node and the output node. The feedback signal is generated responsive to a voltage level at the output node. A transistor, coupled between the output node and a second power node, is caused to operate in saturation mode during a period while the voltage regulator circuit is operating.

Abstract: An apparatus for impedance matching of an electrical load to a generator has input connections for connection to the generator and output connections for connection to the load. The apparatus has a converter which connects the input connections to the output connections. An input voltage which is applied between the input connections can be converted into an output voltage. The converter has energy storage means connected to one of the output connections by an active diode, a controllable switching device, and an actuation device. The switching device can be moved to a first and a second switching state so that energy from the generator is stored in the energy storage means in the first switching state. Energy which is stored can be output to the load in the second switching state. A detector is connected to the input connections for detecting a measurement signal for the impedance matching. The actuation device has an activation signal and can be moved to a first and a second operating state.

Abstract: A DC-DC converter control circuit, to control a DC-DC converter having an inductor and two switching elements, including a first feedback circuit to generate a first feedback voltage indicating a DC component of an inductor current of the inductor based on an output current of the DC-DC converter; a second feedback circuit to generate a second feedback voltage indicating an AC component of the inductor current; a synthesis circuit to add the first and second feedback voltages to generate a third feedback voltage; a comparator to compare the third feedback voltage with a reference voltage to output a control signal; and a driving circuit to control the switching elements. The second feedback voltage is generated based on a difference between input and output voltages of the DC-DC converter when the control signal from the comparator is low and based on the output voltage when the control signal is high.

Abstract: The present invention provides a comparator with novel output logic. The comparator makes a comparison between an input voltage and a reference voltage. A differential amplifying circuit includes a first input transistor with a control terminal applied with the reference voltage and a second input transistor with a control terminal applied with the input voltage. An output section receives an export signal of the differential amplifying circuit and outputs an output signal that corresponds to the export signal and denotes a result of the comparison. A feedback circuit receives the output signal of the output section, and if the output signal is changed from a first level to a second level, the output signal feeds back to the differential amplifying circuit or the output section while it is restored to the negated level.

Abstract: An exemplary method for improving voltage identification (VID) transient response is adapted to a voltage regulator and includes steps of: continuously sensing an inductor current of the voltage regulator to thereby output a current sense signal; during a steady state operation period, sampling the current sense signal to thereby obtain a sampling result for providing a droop control signal; after entering a VID transient period from the steady state operation period, holding the sampling result for providing the droop control signal; and taking the droop control signal as a consideration factor of producing a pulse width modulation signal to regulate an output voltage of the voltage regulator.

Abstract: A circuit, use, and method for operating a circuit is provided that includes a regulated first voltage source for providing a supply voltage at an output of the first voltage source for a subcircuit, an adjustable second voltage source for providing an output voltage to supply the subcircuit, and an evaluation circuit, which is connected to an output of the second voltage source and to a control input of the second voltage source and to the output of the first voltage source. Wherein the evaluation circuit is formed to adjust the output voltage of the second voltage source by means of a control signal at the control input of the second voltage source with evaluation of the supply voltage at the output of the first voltage source, and wherein the evaluation circuit and/or the second voltage source have a memory for storing values of the adjustment.

Abstract: Disclosed herein is a system and method for identifying individual coaxial cables in a bundle of coaxial cables. The system includes a coaxial cable header that is configured for receiving one or more coaxial cables and establishing electrical conductive contact with only a conductive shield on a first end of each cable. The system also includes an electrical tester that is electrically connected to the coaxial cable header such that the electrical tester is configured to transmit signals through the conductive shields of each cable. The electrical tester includes a test probe that is configured to be selectively connected to a second end of each cable. The electrical tester is configured to identify whether the second end of a particular cable that is connected to the test probe corresponds with the first end of a pre-determined cable that is within the coaxial cable header.

Abstract: A phase identification system includes a power distribution station and a phase detection device. The power distribution station includes a phase distortion device for generating voltage distortions of a known harmonic frequency in at least one of three phase voltage signals of the power distribution station. The phase detection is configured to receive at least one of distorted three phase voltage signals and to identify a phase of the received voltage signal. The phase detection device includes a delay circuit to generate a phase shifted voltage signal of the received voltage signal and a transformation module to transform the received voltage signal and the phase shifted voltage signal into d-q domain voltage signals of a known harmonic frequency reference frame. A phase determination module in the phase detection device determine the phase of the received voltage signal by comparing an amplitude of a harmonic of the known harmonic frequency in the received voltage signal with a threshold value.

Abstract: An analog input module for a programmable logic controller, wherein the analog input module has a ground potential, and includes a channel output configured at a first electrical potential, a first channel input configured at a second electrical potential where the absolute value of the second electrical potential is less than the absolute value of the first electrical potential and greater than the absolute value of the ground potential. The analog input module also includes a second channel input, and a third channel input, where the ground potential of the analog input module is the ground potential of the channel output, of the first channel input, of the second channel input and of the third channel input.

Abstract: A voltage measuring apparatus electrically connected to buck circuits includes the same number of RC circuits as there are buck circuits, an analog/digital (A/D) convertor, a controller, and a display unit. Each RC circuit is configured to be electrically connected in parallel with an inductor of one corresponding buck circuit. The A/D convertor selectively obtains an analog voltage of one of the buck circuits, and converts the analog voltage signal into a digital voltage signal. The controller controls the A/D convertor and receives the digital voltage signal from the A/D convertor. The display unit displays a decimal voltage value based on the digital voltage signal.

Abstract: A magnetic-field sensor and a method of calibrating a magnetic-field sensor are disclosed. In one embodiment the method includes supplying the measurement arrangements with an excitation signal to generate a tappable measuring signal at each measurement tap of the measurement arrangements, detecting the measuring signals, evaluating the detected measuring signals by comparing the detected measuring signals with a comparison value, determining the measurement arrangement with a smallest difference, in terms of magnitude, between the detected measuring signals and the comparison value, and choosing the measurement arrangement with the smallest difference for a measurement operation of the magnetic-field sensor. The magnetic-field sensor includes a plurality of magnetoresistive sensor elements connected to form measurement arrangements each measurement arrangement including a measurement tap, wherein the magnetoresistive sensor elements are laterally distributed on a chip of the magnetic field sensor.

Abstract: In a position detector having two sensors, a first sensor detects a position indicated by a first indicator by electromagnetic induction and a second sensor detects a position indicated by a second indicator by a detection method other than electromagnetic induction. The position detector reduces adverse effects of the transmission signal supplied to the second sensor on the electromagnetic induction position detection circuit. The position indication state of the first and second indicators is determined based on a signal output from the first sensor according to the position indication by the first indicator on the first sensor and a signal output from the second sensor according to the position indication by the second indicator on the second sensor. According to the determination results of the position indication state, the level of the transmission signal provided to the second sensor to detect the position indication by the second indicator is controlled.

Abstract: Absolute counters for linear segments or revolutions having a Wiegand element (WE) in the main field between two opposite excitation magnets (EM1, EM2) connected by a common ferromagnetic back connection body (14), and an additional sensor element (SE) for determining the information about the polarity and the position of the excitation magnet, wherein the output signals of the Wiegand element (WE) simultaneously supplies energy for the required counter and logic electronics, as well as having an additional sensor (ZS) for the fine resolution in the frame work of a multi-turn which also lies within the main field between the excitation magnets (EM1, EM2).

Abstract: The invention relates to a rotation path detection device for vehicles of public transportation having a drive device (20) for an entry/exit apparatus, which is mounted so it can be pivoted and/or displaced. Said apparatus has a drive unit (22), an electric drive motor (44), and a first reduction gear (26) and a second reduction gear (72), which is connected to the drive motor (44), having a sensor for ascertaining the position of the reduction gear.