Robert Boschgmbh

David Fricker

Ulrich Vollmer

Gerhard Knecht

Jochen Moench

Michael Soellner

Armin Jerger

Tankred Mueller

Johannes Rehagen

Dominik Denz

Thomas Malich

Alexander Reiss

Pierre Bernard

A method for operating an electrically commutated machine. In at least one method step, in particular in at least one method step of overmodulation operation of the electrically commutated machine, a precommutation angle of the electrically commutated machine is set depending on an efficiency of the electrically commutated machine.

Method for operating an electrically commutated machine

The invention relates to a method for determining a rotor position of a rotatory, multi-phase, electronically commutated electric machine (). Said electric machine () comprises several phase windings () which can be supplied with current by means of phase connectors. Said method consists of the following steps: phase currents and phase connections are identified on phase connections of the electric machine (); the induced currents on the phase connections of the electric machine () are determined from the identified phase currents and phase flows; the identified current indicator of the induced current is provided with respect to a Cartesian coordination system which is fixed to a stator by the induced currents; the position of the rotor is identified as a space indicator angle of the current indicator of the induced current provided with respect to the Cartesian coordination system which is fixed to the stator.

Method and device for the sensor-free position determination of an electronically commutated electric machine

The invention relates to a method for determining a correction parameter for a measurement channel () which is connected to a connection terminal () of an electric motor () in order to measure a terminal voltage (U, U), characterized in that the connection terminal () is connected to a first potential via switching elements (T, T, T, T) for driving the electric motor (), after a steady state of the measurement channel () has been reached, the connection terminal () is connected to a second potential, which differs from the first, by changing over at least one switching element (T, T, T, T), the dynamic response of the measurement channel () is detected following connection to the second potential, and the correction parameter for the dynamic response of the measurement channel () is determined on the basis of the detected dynamic response of the latter.

Method or voltage detection system for determining a correction parameter for a measurement channel and for detecting a terminal voltage of an electric motor

A method for determining a time for a zero crossing of a phase current in a polyphase electrical machine (). The method including driving a driver circuit () for providing phase voltages to operate the electrical machine (); deactivating a pulse-width-modulated driving by at least one power switch (), such that no potential is applied to connecting nodes (AI, A, B, B) by the driver circuit (), at least during a time segment in each cycle of the pulse width modulation; detecting a diode voltage via a freewheeling diode, with which the deactivated power switch () has been provided, within the time segment; and fixing the time for the zero crossing of the phase current as the time after which there is no longer a diode voltage present across the freewheeling diode () within the time segment.

Method and apparatus for determining a zero crossing of a phase current of an electronically commutated electrical machine, in particular for determining a rotor position of the electrical machine

A control device for controlling an electronically commutated motor. The control device includes a control input for a rotor position signal and a control output for connection to field coils of the motor, and generates a load current for displacing a rotor of the motor depending on the rotor position signal outputting said load current via the control output. The control device includes at least one semiconductor switch for switching the load current depending on a semiconductor control signal, and includes at least one pulse generator which generates the load current in the form of a pulsed control signal for displacing the rotor. The control device also includes a delta sigma converter which is at least indirectly connected to the control input on the input side and which is designed to produce the semiconductor control signal in the form of a digital bit stream depending on the rotor position signal.

Control device and method for controlling an electronically commutated motor, and motor

The invention relates to a device and a method for determining the rotational angle of a rotatable element in a non-contact manner, the device including at least one magnetoresistive sensor element which emits at least one first signal for determining a rotational angle of the rotatable element in a first region. A plunger core and a coil move in relation to each other in the axial direction of a shaft according to the rotary movement of the shaft, the coil emitting another signal relating to the modification of the coil inductance, such that rotational angles beyond the first region can be clearly determined in association with the first signal.

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Oberhoffen sur Moder, France

David Fricker