How To Rewire An Electrical Motor To Generate AC Current

You can use just about any motor to generate electric current, if it is wired correctly and you follow specific rules for its use. Modern AC induction motors are quite simple to wire as alternating current generators, and most will begin generating electricity the first time you use them. These motors don't use magnets and the generator relies on residual magnetism to generate current. Because of this, some induction motors used as generators might need a little boost from a battery to start generating current.

1. Inspect Voltage Requirements

Inspect the motor's metal nameplate for the voltage, phase, full load current and speed. The full load current is the maximum amperage you can expect from the generator. The rated voltage represents the approximate voltage it generates. You must turn the motor-generator at 5 to 10 percent over its rated running speed to generate electricity. This motor-generator is a single phase device.

2. Cut the Wire

Cut four pieces of wire approximately 2-feet long, using the cutters on the wire stripper. Strip 1/2 inch of insulation from each end of all four wires.

3. Insert and Crimp the Wire

Insert the end of a wire into the crimp on a spade wire terminal and crimp the wire in place with the crimping tool on the wire stripper. Repeat this for a second wire. Push the spade connectors onto the capacitor terminals.

4. Attach Wire to the Terminals

Loosen one terminal on each side of the receptacle with a screwdriver. Slightly twist the stranded wire on one end of each of the remaining wires, and wrap one around each terminal clockwise. Tighten the terminal screws with the screwdriver. Feed the wires out the rear cable hole in the receptacle wiring box. Mount the receptacle to the box with the supplied screws.

5. Secure the Wires

Hold one wire end from the capacitor and one wire end from the receptacle together with one motor wire end. Place a wire nut over the three wires and twist it on clockwise until it is tight. Repeat this for the remaining capacitor, motor and receptacle wires.

1. Start the Motor-Generator

Start the motor-generator turning by whatever means you have elected to use, such as a gasoline engine. The motor-generator must spin at 5 to 10 percent over its rated speed. Allow the motor-generator to run for 1 to 2 minutes.

2. Test Voltage

Set the multimeter to test 250 volts AC. Hold the multimeter test probes by the insulated handles and insert a probe into the two receptacle slots. The multimeter voltage should read between 110 and 135 volts.

3. Use the Generated Power

Plug a lamp into the receptacle and turn on the light. The light bulb should light up if the multimeter showed the correct voltage range.

1. Discharge Capacitor

Allow the motor-generator to come to a complete stop for troubleshooting, if it does not generate current. Discharge the capacitor by touching one terminal with the screwdriver, and then the other while maintaining contact with the first terminal.

2. Disconnect Capacitor Wires

Disconnect the capacitor wires and touch each wire to the 12-volt battery terminals for 5 to 10 seconds. Replace the terminals on the capacitor.

3. Restart the Motor-Generator

Start the motor-generator turning again and follow the procedure to test for electrical current. If the motor still does not generate current, it may have a damaged winding or the capacitor is not functioning.