Hawkins Electrical Guide v. 01 (of 10) / Questions, Answers, & Illustrations, A progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications

by N. Hawkins

In construction, the field coils are wound with a greater number of turns than actually required, the machine being accurately adjusted by a running load test after completion.

Ques. How is the degree of over compounding varied?

Ans. A rheostat is placed in shunt with the series winding so that the current passing through the winding may be regulated to control the voltage of the machine.

Ques. How are the ends of the shunt winding of a compound dynamo connected?

Ans. There are two methods of connection, being known as the short shunt and the long shunt.

Ques. Describe the short shunt.

Ans. In the short shunt, the ends of the shunt winding are connected directly to the brushes as in fig. 196.

Ques. Describe the long shunt.

Ans. In the long shunt, one end of the shunt winding is connected to one of the brushes and the other end to the terminal connecting the series winding with the external circuit as in fig. 197.