A method of controlling a brushless motor, the method comprising exciting a winding of the motor for a conduction period over each electrical half-cycle of the motor. The length of the conduction period is defined by a waveform that varies periodically with time. Additionally, a control system that implements the method, and a motor system that incorporates the control system.

Control of a brushless motor

For each phase of a controller, semiconductor switches comprise a high side switch and a low side switch. A direct current voltage bus provides electrical energy to the semiconductor switches. A measuring circuit is adapted to measure the collector-emitter voltage or drain-source voltage for each semiconductor switch of the controller. A data processor determines that a short circuit in a particular semiconductor switch is present if the measured collector-emitter voltage or measured source-drain voltage for the particular semiconductor switch is lower than a minimum threshold and if an observed current associated with the particular semiconductor switch has an opposite polarity from a normal operational polarity. A driver simultaneously activates counterpart switches of like direct current input polarity that are coupled to other phase windings of the electric motor, other than the particular semiconductor switch, to protect the electric motor from potential damage associated with asymmetric current flow.

Method and controller for an electric motor with fault detection

The present invention relates to a reluctance resolver (100) with an at least partially soft magnetic stator (104) and an at least partially soft magnetic rotor (102) which oppose each other by forming an air gap. The magnetic resistance in the air gap changes periodically on account of a configuration of the rotor that varies over the circumference. The angle sensor has a magnetic flux transmitter which is arranged on the stator and generates a predefined magnetic flux distribution in the air gap via at least one pair of poles. Furthermore, a magnetic flux receiver, which measures the intensity of the magnetic field via at least two pairs of signal poles arranged offset from one another at an angle, is arranged on the stator, wherein an angle value for a position of the rotor in relation to the stator can be derived from the two receiver signals. According to the invention, the stator (104) has distributed over the circumference a large number of teeth (110) which are separated from one another by grooves, and the magnetic flux transmitter comprises at least two primary windings which are arranged in such a way that at least one of the teeth carries no primary windings.

Magnetoelectronic angle sensor, in particular a reluctance resolver

A detecting device includes a detecting part configured to detect a change in an object to be detected so as to output a detection signal, an amplifying part configured to amplify the detection signal output from the detecting part to output a first amplification signal, a reference voltage supply part configured to supply a reference voltage to the amplifying part, the reference voltage being input to the amplifying part to be output as a second amplification signal, a switching part configured to switch a connection between the detecting part and the amplifying part or a connection between the amplifying part and the reference voltage supply part based on a control signal input thereto, and a comparing part configured to compare a predetermined amplification factor in the amplifying part, with an amplification factor obtained from the second amplification signal so as to output the comparison result as a comparison signal.

Detecting device and current sensor

The purpose of the present invention is to sense malfunctions of a charge/discharge current sensor of a cell, and to estimate and manage the charging rate of the cell when the charge/discharge current sensor is malfunctioning. This vehicle power supply device is provided with a charging rate estimation unit (102c) for estimating the charging rate of the cell, an operating current estimation unit (102d) for estimating the operating current of the electric load connected to the cell, and a charge/discharge current sensor malfunction-sensing unit (102b) which determines that there is a malfunction in a charge/discharge current sensor CS for detecting the charge/discharge current of the cell if the difference between the charge/discharge current and an operating current estimated value is at least a prescribed value; the vehicle power supply device being configured so that the electric load is operated at low output when a malfunction is detected in the charge/discharge current sensor CS, and the charging rate of the cell is estimated using the operating current estimated value.

Vehicle power supply device

The invention relates to a method for diagnosing current sensors (S1, S2) of an n-phase induction machine (M) having n-1 current sensors, wherein the n phases (U, V, W) of the induction machine are short-circuited for a brief period of time during normal operation of the induction machine, and the time progressions of the n-1 currents are measured by the n-1 current sensors during short-circuit operation. The actual values of the time progressions of the n-1 measured short-circuit currents are compared to corresponding prescribed target values for the n-1 short-circuit currents. A potential fault state of one or more current sensors is determined from the comparison.

Method for diagnosing current sensors in an induction machine during operation thereof

The invention relates to a method for diagnosing current sensors (S1, S2) of an n-phase polyphase machine (M) having n-1 current sensors, wherein the n phases (U, V, W) of the polyphase machine are short-circuited for a brief period of time during normal operation of the polyphase machine, and the time progressions of the n-1 currents are measured by the n-1 current sensors during short-circuit operation. The actual values of the time progressions of the n-1 measured short-circuit currents are compared to corresponding prescribed target values for the n-1 short-circuit currents. A potential fault state of one or more current sensors is determined from the comparison.

METHOD FOR DIAGNOSING CURRENT SENSORS IN polyphase MACHINE DURING OPERATION THEREOF

Ein Verfahren zur Diagnose von Stromsensoren (S1, S2) einer n-phasigen Drehfeldmaschine (M) mit n-1 Stromsensoren, bei dem wahrend des Normalbetriebs der Drehfeldmaschine die n Phasen (U, V, W) der Drehfeldmaschine fur eine kurze Zeitdauer kurzgeschlossen werden und wahrend des Kurzschlussbetriebs die zeitlichen Verlaufe der n-1 Kurzschlussstrome durch die n-1 Stromsensoren gemessen werden. Die Istwerte der zeitlichen Verlaufe der n-1 gemessenen Kurzschlussstrome werden mit entsprechenden vorgegebenen Sollwerten fur die n-1 Kurzschlussstrome verglichen. Aus dem Vergleich wird auf einen moglichen Fehlerzustand eines oder mehrerer Stromsensoren geschlossen.

Verfahren zur diagnose von stromsensoren einer drehfeldmaschine während deren betriebs

The invention relates to an assembly and to a method for determining the angular position of a rotating machine by way of an inductive sensor (1). From the excitation signal (17) for the primary winding (2) of the sensor and the voltages induced in the two secondary windings (3, 4) of the sensor, three more signals are derived using phase shifters (9, 10, 11) and polarity sign determination units (12, 13). The six signals in total are sampled using a sample and hold sampling unit (14) and provided to a processor (15) for evaluation, which then calculates the current angular position of the rotating machine at the sampling time.

Assembly and method for determining angular position

An assembly and a method determine the angular position of a rotating machine by way of an inductive sensor. From the excitation signal for a primary winding of a sensor and voltages induced in the two secondary windings of the sensor, three more signals are derived using phase shifters and polarity sign determination units. The six signals in total are sampled using a sample and hold sampling unit and provided to a processor for evaluation, which then calculates the current angular position of the rotating machine at the sampling time.

Bernhard Wagner

Papers

Method for diagnosing current sensors in an induction machine during operation thereof

METHOD FOR DIAGNOSING CURRENT SENSORS IN polyphase MACHINE DURING OPERATION THEREOF

Verfahren zur diagnose von stromsensoren einer drehfeldmaschine während deren betriebs

Assembly and method for determining angular position

Assembly and method for determining an angular position