Models 5E, 5F, 5G & 5H Electric Switch Machines: Single ... - Alstom

Theory of OperationThe switch machine motor converts 110 VDC (or 24 VDC) electrical energy tomechanical energy, providing a rotating motion for driving the gear train. Reversingcurrent flow to the motor and energizing different field coils changes direction ofrotation. Figure 2–9 shows the motor connection diagram as viewed from thecommutator end of the motor.Figure 2-9. Motor Connection (Series Split Field) DiagramElectrical motors are furnished with series split-connected field coils. The internalarrangement of the field coils does not permit changes in the field coil connections.Each field coil is stamped with Alstom drawing number and resistance value.Resistance of 110-volt coil is 0.354-ohm; resistance of 24-volt coil is 0.105-ohm.When viewing the motor from the commutator end, the armature rotates to the rightwhen positive energy is supplied to Terminal 6 and negative energy to Terminal 4.Positive flow is through the armature to Terminal 1, through field coils F3 to F4 and thento Terminal 4. Viewed from the commutator end, the armature rotates to the left whenpositive energy is supplied to Terminal 3 and negative energy to Terminal 6. Positiveflow is through field coils F1 and F2 to Terminal 1, through the armature and then toTerminal 6.NOTEField coils F1 and F2 are energized for rotation to the left and coils F3 andF4 are energized for rotation to the right.P1293, Rev. Jun/07 2–10 Alstom Signaling Inc.