Schneider Toshiba Inverter Europe Sas

Duro Basic

Francois Malrait

Pierre Rouchon

Stefan Capitaneanu

The invention relates to a control method implemented in a variable speed drive for determining the inductances (Ld, Lq) of a permanent magnet synchronous machine comprising three phases (a, b, c), each oriented along a direction, a stator, and a rotor. For each phase, one after the other, said method includes steps of: applying, along the direction of the phase (a, b, c), a voltage vector (V, V, V) in the positive direction and a voltage vector (V, V, V) in the negative direction for a predetermined duration; measuring the current obtained in the phase after applying the voltage vectors in both directions; determining an angle (&#x3b8;) for the position of the rotor in relation to the stator based on the measured current; and determining the flow (Ld) and torque (Lq) inductances of the machine based on the predetermined angle (&#x3b8;).

Method for determining the inductances of a permanent magnet synchronous machine

The invention relates to a method for determining the position of a rotor flux vector of an electric motor (M), comprising a step of injecting a first current vector into a first reference frame (x, y) rotating at a first frequency (&#x3a9;) relative to a reference frame (d, q) synchronous with the rotation of the motor, and a second current vector into a second injection reference frame (x, y) rotating at a second frequency opposite to the first frequency, a step of determining a first stator flux induced voltage delivered at the output of a first integrator module () synchronous with the first reference frame (x, y) and a second stator voltage delivered at the output of a second integrator module () synchronous with the second reference frame (x, y), a step of regulating the position of the rotor flux vector by minimizing the error (&#x3b5;) between a real position and an estimated position (&#x3b8;) of the rotor flux vector, the error being determined based on the second induced voltage.

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Wollongong, Australia

Duro Basic