Homemade Electronic Speed Controller???

[curious]

can anyone make a simple electronic speed controller? i am also new so how exactly does a speed controller do its job? there are 3 lines but only 2 are needed to run a motor?????? :confused: . i intend to use one of these to control a cd rom motor in an airplane. so if anyone can help, thanks :D

[KEC]

can anyone make a simple electronic speed controller? i am also new so how exactly does a speed controller do its job? there are 3 lines but only 2 are needed to run a motor?????? :confused: . i intend to use one of these to control a cd rom motor in an airplane. so if anyone can help, thanks :D

Brushed motors require the simple two wire controllers. Internal motor brushes act as switches as the motor turns to change the current flow directions so that motor poles pull/push against the motor magnets.

Brushless motors have no brushes and the controller needs more smarts to sense when to change current directions.

[Ron van Sommeren]

More do-it-yourself brushless controller designs:
http://www.rcgroups.com/forums/showthread.php?t=140454

Met vriendelijke groeten ;) Ron
• diy outrunner discussion group (http://www.yahoogroups.com/group/lrk-torquemax)
• int. E fly-in & diy outrunner meet (http://home.hetnet.nl/~ronvans/), Nijmegen, the Netherlands