Safran Electrical & Power

Safran Ventilation Systems

Pascal Jacques Frédéric Guy Toutain

Wenceslas Bourse

Pascal Rollin

Guillaume Boulet

David Baltaro

The invention relates to a method for controlling a three-phase inverter () using a 120&#xb0; control arrangement associated with a PWM-type control, the inverter () being driven by a controller and configured to power a permanent-magnet synchronous motor () of a device on board an aircraft. The motor () comprises a stator and a rotor that can be rotated relative to the stator when the motor () is powered. The inverter () comprises three branches (), each branch comprising two switches (and) associated with a motor winding sing a 120&#xb0; control arrangement of a three-phase inverter. The method is characterised in that when one switch on one branch is controlled such as to switch front the on-state to the off-state, the other switch on said branch is controlled such as to be in the on-state for a sufficient amount of time to allow the magnetic discharge of the motor winding associated with said branch.

Method for controlling an inverter

A method for starting a permanent magnet synchronous electric motor comprising a rotor and a stator comprising coils connected respectively to a plurality of phases and a conversion circuit connecting the plurality of phases to a power supply source in order to control the rotation of the rotor of the synchronous motor, the conversion circuit comprising a converter supplying power to a DC-AC converter comprising a plurality of controllable transistors for controlling the rotation of the rotor according to a plurality of successive control phases, the method comprising: &#x2218; a step of controlling the transistors of the DC-AC converter according to a control table associating each control phase with a configuration of the transistors so as to determine an acceleration ramp of the rotor of the motor, &#x2218; a step of determining an electrical angle A based on a predetermined acceleration ACC, and &#x2218; a step of determining a control phase change signal Q if the electrical angle A is greater than a predetermined threshold angle A.

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Moissy-Cramayel, France

Pascal Jacques Frédéric Guy Toutain