Three-Phase Induction Machines
Like other electrical machines, induction machines can be operated as either generators or motors. However, they are primarily used as induction motors. We will concentrate on motoring and later consider applications where induction generation is attractive.
Induction machines are by far the most common type of motor used in industrial, commercial or residential settings. (One notable exception may be in computer equipment, where there are significant numbers of motors used for hard drives, DVD players etc.) Depending on location (which affects other electrical energy uses, such as lighting, space heating) induction motors may consume up to 70% of all electrical energy generated. There are two underlying reasons why induction motors are the general purpose motor of choice:
- Induction motors are cheap
- Induction motors are robust