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Motor/variable speed foot pedal setup
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Posted by: T/DDave

09/16/2009, 20:21:02

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Hoping someone could point me in the right direction. I'm a Tool & Die Designer and Maker and I am currently in process of building a piece of equipment for a winding application. I have designed the entire mechanical end of the unit but am having trouble with the motor/electrical. I need a variable speed high torque motor that I can control with a foot pedal. There is a unit similar to the one I am building that uses a 1/4HP 1750 56C Leeson SCR DC motor. As far as the application it works beautifully, but due to the motor / pedal combination they have been forced to put a mechanical stop on the pedal to keep it from exceeding 90V I'm guessing? Due to the fact if the pedal is depressed to its limit the motor reaches a point where it locks up and seems to want to turn both directions simultaneously? I would like to come up with a little more refined setup without costing an arm and a leg. One that would use the full range of this motor or one like it without having to rig up a foot pedal or add the cost of a drive.







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: Motor/variable speed foot pedal setup
: Motor/variable speed foot pedal setup -- T/DDave Post Reply Top of thread Engineering Forum
Posted by: zekeman

09/17/2009, 00:05:15

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I suspect that the 90 volt limit is because that is the rated voltage for that particular DC motor.
If it locks up the way you say, I don't understand why you don't put your own stop in short of the limit you now have.
Finally, ask the manufacturer about the shortcomings of the unit.







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