The Simple DC Motor MIT（简单的直流电机麻省理工学院）.pdf

The Simple DC Motor: A Teacher’s Guide Kristy Beauvais Research Experience for Teachers Center for Materails Science and Engineering Massachusetts Institute of Technology August 2003 Motor Design: Steven Leeb, MIT Table of Contents The Anatomy of the Motor: What are its components? 1 The Physiology of the Motor: How does it work? 2 The Blueprint: How to build a simple DC motor. 6 Troubleshooting: What if it doesn’t work? 8 Pre/Post Assessment: What do I know about motors? 9 Supply List: Where can I get the materials? 11 2 The Anatomy of the Motor: What are its components? 20 AWG wire paperclips 9 volt battery thumbtacks battery snap w/leads ceramic magnet wood base 3 The Physiology of the Motor: How does it work? Motors convert electrical energy (from a battery or voltage source) into mechanical energy (used to cause rotation). When a wire that carries current is placed in a region of space that has a magnetic field, the wire experiences a force. • The size of the force, which determines how fast the motor spins, depends on : o the amount of current in t