“ MOTORS AND GENERATORS “ AC MOTORS AND GENERATORS U.S. ARMY TRAINING FILM PART 2 14334
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This 1961 U.S. Army training Film is the second in a series on motors and generators and covers the physics behind different types of AC generators. Given that AC generators are present in everything from simple desk fans to rotating radar antennae their basic function is essential knowledge for certain Army personnel. The film covers, almost exclusively in the form of animations, the basic physics behind AC generators including the different types based on the number of poles and single and three phase generators. It also looks at single, phase, split phase, and three phase induction motors as well as how to start them by either using shaded poles, starter poles, or with a centrifugal switch.
0:09 Title “The United States Army Presents 3107”, 0:17 “Motors and Generators”, 0:27 “Part II AC Motors and Generators, 0:49 footage of high voltage lines at a power distribution center, 1:08 a radar antenna spinning around, 1:19 animation of a basic AC generator creating electro-motive Force, 1:35 slip rings added to the generator to maintain a steady AC output, 1:55 graphical representation of voltage created by each revolution of the generator, 2:26 demonstration of armature moving with a different magnetic field including a 4 and 6 pole field, 3:36 formula for frequency in an AC generator with a mathematical demonstration, 4:50 animation of the different types of AC generators including a single phase generator and three phase generator, 6:28 footage of a large AC generator with a demonstration of its parts including armatures, coils, wiring, brushes, and slip rings, 7:34 man working with a power drill, 7:51 animation of how to create an AC motor including graphical representations of EMF with each rotation, 8:40 animation of a simple induction motor and the interaction of the conductor with the magnetic field, 10:01 a three phase induction motor shown energizing the magnetic poles in successive order causing a rotation in conductor, 11:16 the same demonstration but for a two phase induction motor with changes in the direction of rotation, 12:35 animation of how a single phase induction motor works, 13:18 animation of how to start single phase induction motors including through the use of shaded poles and the effects that these have in the motion of the conductor, 15:11 animation of use of a started winding to start a single phase induction motor thereby creating a split phase motor including with a graphical representation of voltage and current, 17:24 use of starter windings with capacitors as the third method to start a single phase induction motor, 18:21 a person showing the centrifugal switch in an AC motor, 18:47 a juke box playing a record, 19:12 animation of how a synchronous motor works, 19:51 Summary animations of what has been covered in the video so far including the use of slip rings, how frequency can be adjusted, the formula for frequency, a single phase generator, a two phase generator, a three phase generator, three phase induction motor, single phase induction motor, shaded poles, starter poles, and synchronous motors, 23:51 “The End 3107.”
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This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD, 2k and 4k. For more information visit
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