Abstract: A gate-controlled electric drive comprises a synchronous motor (2) having m windings (2) and provided with a shaft position transducer whose output is connected to an address input of a permanent memory. The outputs for setting a pulse width code of said permanent memory are connected to inputs of pulse-width modulators, while outputs for setting a polarity code of said permanent memory are connected to inputs of a reverser. The outputs of the pulse-width modulators are connected to control inputs of corresponding control units, whereas inputs for setting polarity of the control units are connected to outputs of the reverser. The outputs of each control unit are connected to inputs of a respective switching unit based on bidirectional switches connected in a bridge circuit, a switching unit being connected to the respective winding of the synchronous motor.

Abstract: A rectifier electric drive has a synchronous machine shaft position transmitter (2) which is electrically connected to an output of a permanent storage (10). The output bus of this storage (10) is connected to control inputs (11) of code-to-pulse duration converters (12) whose number is equal to the number of windings of the synchronous machine (1). The outputs of the code-to-pulse duration converter (12) are connected to pulse duration master inputs (17) of respective switching devices (18) having their pulse polarity master inputs (26) connected to respective outputs of the permanent storage (10). The outputs of the switching device (18) are connected to the windings of the synchronous machine (1). Also provided is a voltage to pulse repetition period conversion unit (34) having its input (35) connected to a voltage source (25) and also connected to the switching devices (18).