METHOD OF AND CIRCUIT FOR PULSE CONTROL OF VOLTAGE IN TRACTION MOTORS OF DC ELECTRIC LOCOMOTIVE Russian patent published in 2006 - IPC B60L9/04 G05F1/56 

FIELD: electric transport.

SUBSTANCE: invention relates to methods and devices designed for starting and control of speed of electric trains. According to proposed method, difference between preset and mean values of motor armature currents are found. Then said difference is introduced into fill factor regulator of pulse converter, and voltage across motor is changed in proportion to value of fill factor. At shunting speed of electric locomotive, conversion frequency is reduced to f₁, for instance, to 100Hz. At operating speeds conversion frequency is restored to nominal value f₂, for instance, to 600 Hz. When changing from conversion frequency f₁ to frequency f₂, duration t₂ of new conducting state of converter is calculated as t₂(f₁/f₂)t₁ where t₁ is time of conducting state of converter at operation with frequency f₁. Pulse converter for implementing the method contains series-connected LC filter, semiconductor transistor control element, smoothing reactor, traction motor and motor field winding shunted by back diode. Control input of control element is connected with microprocessor control unit.

EFFECT: provision of movement of electric locomotive at shunting without shocks of traction force and without dangerous actions onto signals of automatic block system and provision of electromagnetic compatibility.

10c l, 4 dwg