Hawkins Electrical Guide v. 02 (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

Ques. What is necessary with a smooth core?

Ans. Driving horns as later described.

Fig. 350.—Laminated smooth core armature partly assembled. It consists of numerous discs of thin sheet iron threaded on the shaft and pressed together by end plates. The object of this construction is to prevent eddy currents.

Ques. What is a slotted core?

Ans. One having a series of parallel slots, similar to the spaces between the teeth of a gear wheel, and in which the inductors are laid.

Ques. What provision is made to avoid eddy current in cores?

Ans. They are laminated.

Ques. Describe this method of construction.

Ans. The core is made of stampings of thin wrought iron or mild steel. The numerous discs stamped from the sheet metal are threaded on the shaft as in [fig. 350], forming a practically solid metal mass.