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.
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.
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.
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.
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.
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.
Testing for Power
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.
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.
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.
No Electricity
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.
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.
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.
TL;DR (Too Long; Didn't Read)
Minimum capacitor size is about 200 microfarad for a 1 horsepower motor. Connect two capacitors in series to add their values -- connect one terminal on one capacitor to one terminal on the other. Then connect the two remaining terminals to the motor as indicated. Multiple capacitors may be connected this way to add their capacitance to produce the needed value.The motor-generator will not generate electricity if started under a load. Remove all electrical loads before starting the generator.
Do not shut off the generator without removing the load first, or the motor will be demagnetized and will have to be "flashed" as shown in the "No Electricity" section.
As the electrical load increases, voltage drops. Conduct some experimentation with loads to determine when the voltage reaches a brownout level of about 105 volts.
Warning
The motor-generator described is capable of generating lethal currents. Always shut the motor down, remove its power source and discharge the capacitor before working on the circuit.Provide a secure mount for all components including the motor-generator, capacitor and receptacle wiring box. Route all wiring safely.
The motor-generator will stop producing electricity if it is overloaded or used to start a motor of a similar size. Induction motor-generators can only start motors of about 1/5 to 1/10 of their own horsepower rating.
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