Generator Vs. Motor

Some generators, such as wind generators, can be made out of converted motors.

Generators are devices that turn mechanical energy into electrical energy. Electric motors are devices that turn electrical energy into mechanical energy. Though they perform opposite functions, there are actually few differences between motors and generators.

Parts

Generators and motors use the same basic parts. Both devices are essentially coils of wire suspended in a magnetic field. A rotating armature holds either the coil or magnets generating the field, depending on the design. The only differences in construction are found in the peripheral parts. A generator is attached to a device like a hand crank or water wheel to turn its armature, causing the coil to generate electricity. The motor uses a battery to cause the coil to turn the armature and axle, rotating whatever is attached to it.

Uses

Generators are used to charge batteries or provide power for tools or appliances. Motors are used to turn devices like wheels and drill heads.

Considerations

Any motor can be made to function as a generator, and any generator can be made to function as a motor; all that is necessary is to run them backwards. However, each may not function quite as well when reversed. A motor's bearings might not stand up well to the stresses a generator experiences, for example. In addition, a generator or motor might not work efficiently at the new rotational speed it is run at when reversed.

References

• Georgia State University Hyperphysics: Motors and Generators
• University of New South Wales: Electric Motors and Generators
• Power Plans: DC Permanent Magnet Motors For Building Wind Turbine Generators
• OtherPower: Alternator and Generator Comparison For Wind Power

Resources

• OtherPower: Options For Getting Started In Wind Power