Technical animation: How works a DC motor?

Technical animation: How works a DC motor?


This video shows the DC motor principle. Let’s take a simple model of a DC motor with one single turn of a conductor placed between two opposite magnetic poles. Here you get an overview of the main components to understand how this coil can rotate. We should have a closer look at a current carrying wire within a magnetic field. A current carrying wire generates a concentric magnetic field which interacts with the field of the permanent magnet. Magnetic field lines with opposite directions will attract each other; those with same directions will push off each other. That’s why a force is applied to this wire. The direction of emotion can also be described by Fleming’s left-hand rule. To the coil you can apply the principle of the lever- you get a torque. When the coil turns 90 degrees the brushes lose contact with the commutator and the current stops flowing through the coil. However the coil keeps turning because of its own momentum. As a result the commutator rings get interchanged with their contacts to the brushes. Therefore the current continues to flow in the same direction and you keep the direction of the torque. It’s easy – just change the poles of your power supply. Watch also our next videos!

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