How to Assemble a Dynamo With a DC Motor?

Electric motors and power generators are often identical in design. An AC motor, for example, may also be used as an alternator. The major difference in function depends upon whether the device is used to generate electricity such as an alternator or generator, or whether electricity is applied to the device to do work.

A DC motor contains a device called a commutator. This device allows a DC motor to produce DC power without adding any other electronics to the motor leads. When force is applied to a DC motor's rotor, the DC motor will work as a DC generator, also known as a dynamo.

* Use the electrical pliers to cut two lengths of electrical wire, with each length being six inches long. Strip 1/2 inch of insulation from the ends of each wire segment.

* Place one end of the first wire on the motor's positive electrical terminal. Melt a small drop of solder to both the electrical terminal and to the end of the first wire. Smooth out the soldered joint with the tip of the soldering iron, making sure that the electrical joint is shiny and free of lumps. Use this procedure to solder one end of the second wire to the negative electrical terminal.

* Attach the crank to the rotor shaft on the motor.

* Turn on the multimeter and set the measurement scale to "Volts DC." Connect the red probe to the loose end of the first wire, which should be attached to the positive electrical terminal. Connect the black probe to the loose end of the second wire attached to the negative terminal.

* Turn the crank and observe the multimeter display. If the crank is turned slowly, the voltage will fluctuate greatly. However, if the crank is turned quickly, the voltage will stabilize.