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Tip-magnetic driving (TMD) is a fan technology invented by Yen Sun Technology Corporation (also known as Y.S. Tech).
![](http://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/TMD_Fan.jpg/220px-TMD_Fan.jpg)
TMD moves the motor out of the hub of the fan and puts it around the edge. The impeller blades are surrounded by a ring studded of twelve magnets which are acted upon by four coils located in the corners of the frame.
The design of a TMD fan reduces approximately 75% of the motor hub area of a traditional fan.
They are known to be a large amount louder than standard hub-motor fans.