PURPOSE: To demonstrate the concept of a synchronous motor.

DESCRIPTION: The power supply, operating at 8 volts, is connected to the armature coil through the double-ring comutator. The current reversing switch is used with the armature coil. Reverse the current twice per rotation as the device operates. This is tricky; you will have to practice to be able to get the rotation in sync with your manipulation of the current reversing switch.

SUGGESTIONS: IMPORTANT NOTE: Please disconnect the power supply when not operating the motor so that the coil will not be destroyed.

REFERENCES: (PIRA 5K40.55)

EQUIPMENT: AC/DC generator with double-pole double-throw switch and power supply set to 8 volts.

SETUP TIME: 5 min.