Chapter 14

Mechanical Systems

Another broad category of electrical loads includes those devices
that convert electrical energy into mechanical energy. Electric motors fall
into this category of load devices. They are mechanical power-conversion
systems. There are many types of motors used today. The electrical mo-
tor load is the major power-consuming load of electrical power systems.
Motors of various sizes are used for purposes that range from large indus-
trial machine operation, to operating power blenders and mixers in the
home.

IMPORTANT TERMS

Chapter 14 deals with mechanical systems. After studying this chap-
ter, you should have an understanding of the following terms:

Motor
Rotor
Stator
Brush/Commutator Assembly
Torque
Load
Speed
Counterelectromotive Force (CEMF)
Armature Current
Horsepower
Speed Regulation
Direct Current (DC) Motors
Permanent-Magnet DC Motor
Series-wound DC Motor
Shunt-wound DC Motor
Compound-wound DC Motor

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