Motor control apparatus for a railway switch machine

摘要

A motor control apparatus for a railway switch machine includes a power source for a voltage; a selector for providing the voltage to a reversible motor of the switch machine in a normal state, and for providing a reverse polarity of the voltage to the reversible motor in a reverse state; a first transistor for switching reverse current flowing through the reversible motor; a first diode electrically connected in parallel with the first transistor for conducting normal current for the reversible motor; a second transistor for switching normal current flowing through the reversible motor; a second diode electrically connected in parallel with the second transistor for conducting reverse current for the reversible motor; and a circuit for controlling the first and second transistors based upon the position or operating mode of the railway switch machine.