Dpdt Off
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Cheap Direct Current Motor Control?
I need to find a cheap way to control a pair of motors; they are 24 volt at 15 amps apiece. Instead of buying a computerized controller, can I just use a DPDT on-off-on switch and a rheostat to control direction and speed or would this overheat too easily and be hard on the motors?
Yeah you could do that but it's pretty inefficient, and the torque of the motors will fall as the current falls.
A single channel PWM speed controller can be constructed from a "555". Use a power transistor to handle the current power http://www.dprg.org/tutorials/2005-11a/index.html
556 have two 555's on one chip.Single chip solution? Couple of £s or $s max?
Probably a decent idea to place some diodes to protect the chip/transistor from inductive kickback.
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October 1st, 2009 in
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