Alternating Current, Motors, & Controls

Join CaptiveAire for a professional development hour (PDH) about the basics of Alternating Current (AC) and motors, including discussions about generators, power distribution, transformers, motor types, speed controls, and more. This video is helpful for anyone who wants to learn more about electricity and how it functions. The next video in this series will explain basic computer logic and its role in modern control systems. Learn more about CaptiveAire at captiveaire.com.
To receive PDH certification for this video, please visit CaptiveAire.com/library and click Request Access under the Professional Development section. Fill out the form on the pop up that appears and click Send. CaptiveAire will then add you to a professional development portal where you can access a certificate to confirm your training.
01:07 Part 1 - Power Generation
01:34 Faraday’s Induction
03:37 Lenz’s Law
05:26 The First Generator
06:39 Visualizing Alternating Current
07:35 Commutators
09:30 Generator Types
10:15 Sinusoidal Waves
11:46 Single vs. Multi Phase Power
12:34 Part 2 - Power Transmission and Distribution
13:16 Mutual Induction
14:13 Transformers
16:16 High Voltage Transmission
17:31 Wye vs. Delta Systems
18:31 Multitap Transformers
20:31 AC vs. DC with Resistive Loads (RMS Explained)
22:24 Part 3 - Motors
22:27 Motors Compared to Generators
23:11 Building a Motor In Real Life
25:02 Synchronous Motors
25:49 DC Motors
26:57 The Induction Motor
28:05 Asynchronous Motors
29:01 Capacitor Start Motors
29:31 How Capacitors Work
32:48 3 Phase Motor Advantages
33:21 Understanding Torque
35:44 Belt Drive vs. Direct Drive
38:30 Part 4 - Motor Controls
38:38 Soft Start
38:51 Why Speed Control Matters
39:30 Rudimentary Speed Controls
40:15 Variable Frequency Drives (VFD)
41:44 Rectification
41:50 Diodes
42:09 Full Wave Bridge Rectifiers
42:40 Capacitors as Filters
43:16 Inverters
43:18 Transistors and IGBTs
44:16 Pulse Width Modulation
45:15 Analyzing Inverter Signals
47:00 Electronically Commutated Motors (ECM)

[@adammarchuk8885]

When did you guys start putting out such captive ating BANGERS, goddamn

[@mistertime]

Wow! I will be using these videos to give our green techs and helpers some basics that they have never been taught. Excellent videos! Please keep making them. It will only help the industry that is sorely in need of knowledge.

[@CAPTIVEAIRE]

We're really happy to hear this and please feel free to share. We have more videos coming!

[@sandeeprane748]

Very useful n good video

[@elitehoodservice]

Great video with tons of information 😊

[@brianmcdermott1718]

Great info. Explains a lot. Thanks

[@JLPaper7]

Your work is really great.

[@abdulajees7653]

thank you for your hard work

[@CAPTIVEAIRE]

Thank you for watching!

[@hubercats]

Another really great video from your team at CaptiveAire. I’d like to build a version of the 3-phase motor you show around 23 minutes into the video. I would use it to instruct young people. Do you happen to have a short document that describes the motor? It would be nice to know some basic dimensions, number of coil turns, etc. I plan to program an Arduino (with a few added components like MOSFET current boost transistors) to generate a synthetic 3-phase signal to drive the motor. Thanks!

[@mundymorningreport3137]

Great presentation and editing following standard theory as taught today. However, you have glossed over/dropped the aspect of voltage that also plays a part in the electric field and field effects of EM induction (EMI). (As is done in standard theory training). Magnetism is considered to be current. Magnetism is a measure of the moving electrons (charges) that are pointed ( charges oriented) in the direction of travel. Magnetism or currents do not cancel, they only sum (so opposed currents or magnetic fields exist simultaneously in compliant conductors). This is one of the key aspects of electricity that enable electric induction to produce reverse force when receiving other-directed magnetic fields. (EMI is a kinetic energy transference, subject to amplification the same as rocket engines using the Oberth effect. However, EMI cannot be just a magnetic field transference or else the induced field could not reverse as per Lenz’s law. Instead it must be a voltage induction, just like your balloon to wall example from the previous video, reversing the direction of the free charges in the conductor, producing the opposite magnetic field. Prove this by using a bifilar coil (as patented by N. Tesla) with capacitance between the dual conductors and the capacitance collects the inverted charge, releasing it as the magnet retreats and continues with the opposed pole approach, producing compatible magnetic fields that not only produce motive power and positive current; yielding more energy out than in, like the rocketry Oberth effect. Self-powered and generating motors. (The simplified description promoted by physics leads to a lie as to what is possible.) Party on Dude, be good to each other. We are on the verge of a revolution that could save all life on our planet. 🎉

[@brentlackey8316]

We do need to use dc to save extra power for when the sun doesn't shine or the wind doesn't blow. Modern electronics can easily convert it now. Just look at e cars.

[@mundymorningreport3137]

AC power has an advantage over DC; as voltage and Magnetism are kinetic forces, they transfer exponentially more efficiently when changing than when fixed (DC) resulting is less waste and longer transmission distances. After building AC power plants, Tesla wanted to use impulse power ( even more efficient), but past investors did not appreciate their total loss of investments in AC power infrastructure.

[@brentlackey8316]

Saying that there is a rotating mag field is like saying that a comic strip is a rotating drawing. You have different fields rising and falling like the wave of people at a football game. The people are not running around in the bleachers!

[@brentlackey8316]

People like single phase because the have an outlet for it. They don't want to pay someone to bring in 3 phase.

[@markbell6864]

No love for Nikola Tesla 😢

[@brentlackey8316]

You can turn the wrench you are tightening the bolt! It not ft/lb it is ft*lbs! Please never say per like this ever again.