Скачать с ютуб DC Motors - how do they work? COMPREHENSIVE guide to brushed DC motors в хорошем качестве

DC Motors - how do they work? COMPREHENSIVE guide to brushed DC motors

This animated video explains the basic principles underpinning the operation and control of the Brushed DC motor. We start with an easy to understand mental model rooted in fundamental physics (the Lorentz Force and the Left Hand Rule), then progress to a basic model of the DC motor (incorporating back EMF) and how they can be controlled using modern chopper circuits. I focus on 4 types of DC motor - Permanent Magnet and then the 3 wound varieties: Separately Excited, Shunt and Series. I also explore some more in-depth topics such as flux weakening and armature control. Please let me know if you have any comments on this video! 00:00 Introduction 00:19 Summary of topics 01:00 The Lorentz Force 01:49 The 3 Basic Requirements 03:00 The Permanent Magnet DC Motor 05:15 Commutators 07:35 Back EMF 08:37 The Voltage Balance Equation 10:19 The Speed/Torque Regulation curve 11:19 Why is regulation so good in constant flux machines? 12:00 DC motor control 15:36 The need for more efficient voltage control 16:00 How chopper circuits work and control loops to regulate torque and speed 19:03 The Separately Excited DC Motor 19:49 Why is speed inversely proportional to field? - intro to flux weakening 22:30 The Shunt DC Motor 24:07 The Series DC Motor 26:00 Conclusion