Motion picture projection : an elementary text book (1928)

Record Details:

Title:
Motion picture projection : an elementary text book
Date:
1928
Publisher:
New York : Technical Book Company
Volume:
Motion picture projection : an elementary text book
Leaf #:
000680
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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674 MOTION PICTURE PROJECTION THE MOTOR In most respects the AC motor is of conventional design. Its stator, however, with its winding, is removable and interchangeable with others for different voltage, and to a limited extent, for different phases. This makes such an alteration of the machine a simple matter and a great convenience both in original assembly at the factory and for a customer or dealer. The rotor of the motor is also of special interest. It is wound with copper consisting of flat strips forced into a very large number of diagonal slots in the surface of its laminated core. The ends of these strips are shaped to overlap each other and then acetylene welded into a solid copper ring, entirely eliminating any possibility of trouble from open or partly open circuits of the rotor. THE GENERATOR The generator has on its main poles shunt fields made up of enameled wire and thoroughly well insulated otherwise. Two interpoles take care of commutation, the series winding on these being made up of asbestos cotton covered wire which also is thoroughly insulated from the pole cores. The armature is made up of a well laminated core in the slots of which are imbedded insulated form wound coils, the ends of which, by an improved process, are securely soldered into the bars of the commutator. THE COMMUTATOR The commutator, brush rigging and brushes are, in a sense, the heart of any generator, as it is