Page 25 - Electric Machinery Fundamentals

CHAPTER
1

INTRODUCTION
TO MACHINERY
PRINCIPLES

OBJECTIVES
• Learn the basics of rotational mechanics: angular velocity, angular accelera-
tion, torque, and Newton's law for rotation.
Learn how to produce a magnetic field.
Understand magnetic circuits.
Understand the behavior of ferromagnetic materials.
Understand hysteresis in ferromagnetic materials.
• Understand Faraday's law.
• Understand how to produce an induced force on a wire.
Understand how to produce an induced voltage across a wire.
Understand the operation of a simple linear machine.
Be able to work with real, reactive, and apparent powers.

1.1 ELECTRICALMACIDNES,
TRANSFORMERS, AND DAILY LIFE

An electrical machine is a device that can convert either mechanical energy to elec-
trical energy or electrical energy to mechanical energy. When such a device is used
to convelt mechanical energy to electrical energy, it is called a generator. When it
converts electrical energy to mechanical energy, it is called a motor. Since any given
electrical machine can convert power in either direction, any machine can be used as