McPherson, George, Jr. Department of Electrical Engineering, School of Engineering, University of Missouri, Columbia, Missouri.
Masson, Philippe J. Center for Advanced Power Systems, Florida State University, Tallahassee, Florida.
Dale, Steinar J. Center for Advanced Power Systems, Florida State University, Tallahassee, Florida.
Kosow, Irving L. Series Editor, Electrical Engineering Technology, John Wiley & Sons, Inc., Marietta, Georgia.
Nasar, Syed A. Formerly, Department of Electrical Engineering, College of Engineering, University of Kentucky, Lexington, Kentucky.
Last reviewed:December 2019
- Classification of rotary motors
- Torque development
- Superconducting Motors
- Principle of operation
- Cooling method
- Design challenges
- HTS motor development
- Potential applications
- Speed Control of AC Motors
- Electronic control techniques
- Brush-shifting motors
- Closed-loop control techniques
- Speed Control of DC Motors
- Speed equation
- Armature and field control
- Ward-Leonard system
- Solid-state control
- Related Primary Literature
- Additional Reading
A machine that converts electrical into mechanical energy. Motors that develop rotational mechanical motion are most common, but linear motors are also used. A rotary motor delivers mechanical power by means of a rotating shaft extending from one or both ends of its enclosure. Such a motor is shown in Fig. 1, cut away to show the internal parts. The shaft is attached internally to the rotor. Shaft bearings permit the rotor to turn freely. The rotor is mounted coaxially with the stationary part, or stator, of the motor. The small space between the rotor and the stator is called the air gap, even though fluids other than air may be used to fill this gap in certain applications. Figure 2 illustrates the relationship between the rotor, stator, air gap and shaft.
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