Mitsubishi Electric Corporation

Mitsubishi Electric R&d Centre Europe B.v.

Guilherme Bueno Mariani

Nicolas Voyer

Nicolas Degrenne

Gianmario Pellegrino

Anantaram Varatharajan

The present invention concerns a method and a device for determining a position of a rotor of a three-phase motor using a FOC system. The invention: —determines, by a proportional-integral controller, a first control voltage vector at a first instant, —transforms the first control voltage vector using an inverse Park transform, —sums the transformed first control voltage vector to a regular polygonal voltage pattern applied during a given duration, —performs a PWM from the sum of the transformed first control voltage vector and the regular polygonal voltage pattern, —controls the motor with the pulse-width modulation, —measures the current at each phase of the motor, —estimates the position of the rotor from the measured currents and from the regular polygonal voltage pattern, —determines, at a second instant, a second control voltage vector from the measured currents and from the estimated position.

Method and device for determining a position of a rotor of a three-phase motor

A method for estimating degradation of a wire-bonded power semi-conductor module is provided. The method includes obtaining an indicator of degradation (Degr); estimating an estimated indicator of degradation (Degr) by a temporal degradation model; obtaining a set of on-line measure (X); then, (1) converting the on-line measure (X) into a deducted indicator of degradation (Degr) by an electrical equivalence model, and (2) computing a deviation between estimated and deducted indicator of degradation (Degr; Degr); and/or (1) converting the estimated indicator of degradation (Degr) into a set of on-line estimation (X), and (2) computing a deviation between set of on-line measure and estimation (X; X); and correcting the estimated indicator of degradation (Degr) into a corrected estimated indicator of degradation (Degr) as a function of the computed deviation.

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Rennes, France

Guilherme Bueno Mariani