How Does a Variable Frequency Drive (VFD) Work? скачать в хорошем качестве

How Does a Variable Frequency Drive (VFD) Work?

For a long time it was easy to control the speed of a DC motor but difficult to control the speed of an AC motor. This all changed with the rise of the Variable Frequency Drive, leading to the dominance of the AC motor for use in industrial processes. In this video Joe Robinson explains in simple easy to understand terms just how a Variable Frequency Drive works. Take the free Motor Controls training module here 👉 https://training.efixx.co.uk/course/a... Made with support from @cromptoncontrols3050 , see their full offering of control equipment here: 👉 http://hub.efixx.co.uk/Aih Check out the other CPD content we've created here: 👉https://training.efixx.co.uk/#/home 🕐 Chapters 🕕 ========================================== 00:00 How does a variable frequency drive work? 00:17 Full free CPD Module on Motor Controls: 👉 https://training.efixx.co.uk/course/a... 00:41 A brief history of motor speed control 01:01 How does an AC motor work? 01:24 Identifying the ends of three phase motor windings. 01:56 How the nature of a three phase AC waveform relates to motors. 02:55 Why the direction of current through the windings is important. 03:40 Current flow creates magnetic fields. 04:11 What happens after when the current changes direction? 04:45 The moving magnetic field. 05:12 The magnetic field starts to rotate. 05:30 How frequency affects the speed of the rotating field. 06:16 The first step in controlling frequency: rectifying 06:51 The remarkable benefit of rectifying an AC supply. 07:22 The next stage of controlling frequency: smoothing. 07:43 The final stage of controlling frequency: back to three phase! 08:00 Harnessing the power of IGBTs. 08:40 How Pulse Width Modulation works. 09:15 Mystery solved, change the frequency, change the speed. 10:00 Full free CPD Module on Motor Controls: 👉 https://training.efixx.co.uk/course/a... ========================================= #motorcontrol #electricians #electricalinstallation