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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)