" MOTORS AND GENERATORS " DC MOTORS AND GENERATORS U.S. ARMY TRAINING FILM PART 1 14324

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Part 2: • " MOTORS AND GENERATOR...
This 1961 U.S. Army training film covers the basic physics behind the function of DC motors and generators. This is demonstrated through progressively more complex animations that discuss the basics, such as the generation of electromotive force, the necessity of adding armatures and commutators, the need to add brushes, and necessary adjustments that need to be made to the neutral plane to avoid sparking which can damage the generator. Generators and motors are at the basis of most machines from simple things like field telephones to missile engines, so an understanding of them is essential for all engineers.
0:06 Title “The U.S Army Presents: Motors and Generators: Part 1 DC Motors and Generators”, 0:51 a missile launching out of a silo, 1:03 an AC and a DC motor next to each other, 1:23 hand demonstration of an electro-motive force, 1:56 animation demonstrating the effect of electro-motive force on voltage, 2:58 animation of a more practical EMF generator through a rotating device with current flow shown, 4:09 EMF equation shown as the animation continues running, 6:17 Animation showing and demonstrating the new equation needed for the calculation of EMF with a rotating conductor, 6:57 animation showing EMF during one revolution of the conductor, 7:28 Animation of AC generator turned into a DC generator through the addition of a commutator, 8:18 graphical representation of the output EMF creating a pulsating direct current, 9:00 attempts to smoothen the ripple of the DC pulses through the addition of magnets, 9:42 demonstration of the armature on actual DC generators, 10:25 animation of brushes placed on the neutral plane to avoid sparking, 11:14 demonstration of armature reaction, 11:37 demonstration of how to avoid sparking by 1. Adjusting the brush position or 2. Adding inter poles, 13:31 Different Iron core inductors demonstrated in a diagram of electric current flow, 15:01 demonstrations of effect of an increase in load on different types of generators, 16:39 Graphic representation looking at terminal voltage and armature current for different generators, 17:24 US Army engineer connects an electric source to DC generator to create a DC motor, 17:58 hand demonstration of a motor, 18:51 animation of an electrically charged conductor moving in a magnetic field for both positive and negative charge, 20:36 demonstration of conductor with armature and a voltage applied moving in a magnetic field, 21:54 animation of the neutral plane in the motor depending on different loads, 22:20 demonstration of how to avoid sparking by again adjusting the brush position or adding inter pole fields, 23:34 animation of the effects of counter electromotive force (CEMF), 24:31 a DC motor starting box, 24:47 animation of how a starting box functions, 25:58 animation of torque in different types of generators such as a series wound, shunt wound, or compound wound motor, 28:50 summary of what has been covered so far such as how EMF is generated in AC and DC generators and what the different type of generators are, 33:45 a missile taking off
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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 www.PeriscopeFilm.com

[@kamakaziozzie3038]

Back in my day, we didn’t refer to electrical discharge between different pieces of equipment as “sparking”. We called it an “arc” or “arcing”.

[@RinksRides]

Ok, thanks.

[@richardjones3112]

Excellent presentation.

[@manhoot]

This film "generated" a great deal of interest in electric generation

[@ovidiovalladares3310]

A one year course in a half hour

[@uralbob1]

This is stuff I learned in the Navy as well as community college back in the ‘70s. I never used this knowledge much, but it’s been very good to have these basics in elec., electronics, and power generators. I’m surprised that I remember as much as I do (which isn’t a lot).

[@kamakaziozzie3038]

If this takes someone a year to learn they may be in the wrong profession

[@goliath991]

One in a million video ❤

[@huwzebediahthomas9193]

Diode bridges for DC, as in vehicles to charge the battery and car DC power supply.

[@lwilton]

When this movie was made, suitable diodes didn't exist. The only suitable high current rectifier in those days was mechanical -- a commutator. Alternators replaced generators in motor vehicles in the very late 1960s and early 1970s.

[@jamesslick4790]

@@lwilton Motorola developed the automotive alternator and Chrysler Corp. began using them in 1960. It took a decade for everyone else to adopt them. Fun fact: Some GM cars used the term "GEN" on the dashboard years AFTER alternators had been adopted!

[@RinksRides]

​@@lwilton rectifier tubes?

[@lwilton]

@RinksRides Something like a relatively high-power rectifier like a 5U4 is many times the size of a buzzer, draws a continuous 15 watts in filament power, would last about a year before being needed to replace, and can handle half the current of a 1N4004 silicon diode. Just not practical in this application. A better choice would have been to use a capacitor. Those were commonly used to suppress arcing across point contacts and to control inductive kickback.

[@vurujak]

What year??

[@mikeadler434]

👍👍

[@huwzebediahthomas9193]

I know (almost) all about motors and generators, brushed or brushless induction.

[@that1electrician]

You don't know shit.

[@KarldorisLambley]

hold on chief I am just putting your medal in the post.

[@kamakaziozzie3038]

LMFAO 😂

[@CorvinusIratus]

Note to millennials and zoomers - these kinds of motors are still being used today.

[@KarldorisLambley]

i came of age in 1998, hence I am a millenial, and I am an electrical engineer. what is your point?

[@CorvinusIratus]

@@KarldorisLambley The point is to indulge in some inter-generational humor.

[@KarldorisLambley]

@@CorvinusIratus oh dear. i see now. i am not very god at that sort of thing. i am sorry. thanks for being polite.

[@CorvinusIratus]

@@KarldorisLambley 🙂

[@RinksRides]

Gonna go out on a limb here eagle eye, boomers need not flex their medals of honor. You may now resume yelling at the neighborhood hoodlums to quote "Get of my lawn!"

[@MusicSoundPlayer]

This all is wrong. It's all about pushing little balls through a tube.

[@kamakaziozzie3038]

You are 💯 correct!

[@RinksRides]

Yes, yes it is.