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Abstract

A control circuit of a synchronous motor with two induction windings, including an electrical power supply assembly (5), two oscillators (2,3) whose outputs are connected respectively to the windings of the motor (1), an intermediary circuit (4), connected on one side to the power supply and on the other to the oscillators, and a central unit for control of the thyristors. The electrical power supply assembly (5) delivers a current of a given unique polarity, and has its output terminals connected by means of a freewheel branch including at least one freewheel diode (6) whose cathode is connected to the positive terminal. The intermediary circuit includes, in combination: a branch composed of two thyristors (10,11) in series, between them connecting the input terminals of the intermediary circuit (4), which are connected respectively to one of the input terminals of the oscillators, in a manner such that the terminals chosen are of opposite polarity, a condenser (14) connected on one side to the junction point of the two thyristors (10,11) of this branch, and on the other side to the two other input terminal of opposite polarity of the oscillators (2,3), two inductances (12,13) of equal value presenting a high coupling factor by mutual induction, respectively connected in series with one of the input terminals of the oscillators (2,3), the terminals chosen being of opposite polarity. Application to railway traction motors.

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