Schneider Electric Industries Sas

Delcho Penkov

Alain Dentella

Christophe Durand

Yann Herriot

Grace Gandanegara

Alain Cote

A control method brakes an electric motor connected to a voltage source. The method involves, in each cycle, the supply of current to the motor, with a delay t, at an angle &#x3b1;. The method includes a sequence such that, for every n cycle, the following steps are executed: a) determining the value of a variation in the resistance of the motor during the preceding n cycles of the voltage, b) comparing the value of the variation in resistance with a threshold resistance value R, c) increasing in the delay tif the value of the variation in resistance is lower than the threshold resistance value. The increase in the delay tis executed in accordance with a gamma command, where the angle &#x3b1; lies between 50&#xb0; and 80&#xb0;.

Control method for breaking an electric motor

Starter system for an electric motor (M) supplied by an electrical network (), the starter system comprising an electronic control circuit () and an electronic switch () for controlling one phase of the motor (M), the electronic switch () being controlled by the control circuit (). The starter system comprises a sensor () intended to deliver an analog signal () that is representative of the derivative of a current flowing through the phase of the motor (M), a detection board () comprising means for transforming said analog signal () into a binary signal () that is representative of the changes in sign of said analog signal, and comprising means for transmitting said binary signal to the control circuit (), so as to optimize the control of the electronic switch ().

Soft starting system for an electrical motor

A method for controlling a switch that controls a power supply line of an electric motor from an alternating voltage source, including determination of a switch closing instant (t) starting from a measurement of the derivative of the current carried on the power supply line. A starter system and a computer program product are capable of using this method.

Apparatus and means for progressive motor start based on current derivative synchronisation

The invention relates to a method of starting an electric motor () powered by an alternating power supply voltage, said method consisting of supplying current to the motor () with a delay t, during each period of the power supply voltage. The starting method comprises a first sequence in which the following steps are carried out during each nperiod of the power supply voltage, where n is an integer number greater than 0: a) determine the value of a variation of a resistance of the electric motor during the previous n periods of the power supply voltage; b) compare said value of the variation of the determined motor resistance with a first threshold resistance value; c) if the value of the variation of the motor resistance is less than the first threshold value, reduce t. The invention also relates to a starter device and a computer program.

Apparatus and means for starting of AC motors, algorithm for self-adapting motor start with soft-starter

A method for controlling a controlled switch operates a power supply of an electric motor from an AC voltage source. The method includes actuating closure of the controlled switch, an instant of actuation of which is dependent on a value characteristic of a value of an electric voltage across terminals of the controlled switch. A control device for such a controlled switch includes elements for implementing the method.

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Saint Martin d'Heres, France

Delcho Penkov