O'Reilly logo

Electric Motor Maintenance and Troubleshooting, 2nd Edition, 2nd Edition by Augie Hand

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Chapter 1

The DC Machine

The DC machines described in this chapter are motors or generators. The term machine is used when the test procedure is the same for both. A motor can be converted to a generator (and vice versa), so the terms motor and generator are used only when the explanation applies to one or the other.

DC generators produce very high-quality power, but (because of maintenance and other costs) AC powered DC drives are used for most motor applications.

DC power is used for some high-voltage power transmission. DC current flows through the whole area of a wire, making it more efficient than AC for long distance transmission. High-voltage AC current uses only the outer portion of the wire. Only two transmission lines are needed with ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required