Melexis Technologies Nv

Driveexpert Gmbh

Drivexpert Gmbh

Sandro Purfuerst

Thomas Freitag

Heiko Grimm

Viktor Petri

Veit Zöppig

Tom Ströhla

A circuit for controlling a multiphase SRM motor, comprising for each winding a low-side and a high-side transistor, and a low-side and a high-side diode for, and at least one current sensor, e.g. a single current sensor, arranged in low-side or high-side implementation for measuring a current through a first and second winding, and a controller adapted for configuring the transistors such that: during a first time slot only the first winding is energized while the second winding is freewheeling via a selected freewheeling path, during a second time slot only the second winding is energized while the first winding is freewheeling via a selected freewheeling path, and measuring the first and second current in said time slots. A method of driving said transistors.

Control circuit and method for controlling a multiphase motor

A method for determining the position of a moving rotor in a switched reluctance motor includes the steps of applying a voltage to a phase winding of the reluctance motor, sampling a signal representative of the current magnitude in this phase winding, detecting a feature of the second temporal derivative of the signal, and determining the position of the moving rotor taking into account the occurrence of this feature. Apparatus for carrying out the method is described.

Determining rotor position in sensorless switched reluctance motors

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Ilmenau, Germany

Sandro Purfuerst