Currently existing thyristor circuits having galvanic connection with the power part have a number of disadvantages: possibility of undesirable unlocking of thyristors, appearance of feedback, connection of low-voltage and high-voltage circuits ...
The result of research of mine electric locomotive pumping on alternating current was the scheme with the use of power magnetic amplifiers, in which the amplifier can be controlled both by the driver and automatically - by electrical signals. The traction motors of the electric locomotive are powered from the AC contact network through a magnetic amplifier with a magnetic key with a DC output. The magnetic amplifier consists of two chokes wound on toroidal cores: one choke C is a power choke, the second choke Y is a control choke. Part of the power winding of the choke C (ax) through the valve Dy is closed to the choke Y. The output voltage of the magnetic amplifier is regulated by a variable resistance Ry, shunting the valve Dy.
If the tractive force of the engines exceeds the tractive force due to the adhesion, slippage of the wheels of the driving wheel sets will occur along with the forward motion of the locomotive. The velocity at the electric locomotive wheel rim will be the sum of the translational slip velocity. In this case, the energy consumption of the locomotive engines will increase sharply. Energy will be additionally spent on abrasion of wheel tyres and haulage rail heads ...
