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Country Discussion Topics
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Motor speeds
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deadcarp    Posted 02-05-2004 at 12:55:19       [Reply]  [No Email]
i guess it's laziness but why don't they offer electric motors that run on different speeds? everything normal is too fast, pulleys are a pain and take room and gearmotors are too slow. how bout 50 rpm? or 200?


rhudson    Posted 02-05-2004 at 19:20:33       [Reply]  [Send Email]
like everything else it cost. a two pole motor will run 3600rpm, four pole 1800, eight pole 900 rpm etc. the more poles the harder/larger it is to make the motor. (these rpms not allowing for slip, which can be around 5 to 15%) there's dc like other have pointed out, variable frequency pricing is comming down. sooner or later they will have stepper motor controls cheap enough that you may be able to dial in any rpm you want.


Red Dave    Posted 02-05-2004 at 17:01:51       [Reply]  [No Email]
They are out there dc, but they ain't gonna be cheap.
AC synchronous motors run at some multiple of line frequency, ie. 1200, 1800, 3600 etc. Induction motors run at just under a multiple of line frequency ie. 1175, 1750, etc. due to pole slippage.
For real smooth speed control you need a series DC motor.
Modern electronics has made motor speed control easier, but it's gonna be tough to do cheaply unless you can find something surplus from an industrial application.


Or...    Posted 02-05-2004 at 13:29:47       [Reply]  [No Email]
You can get gear reduction units...Set input from the motor, with a set output on the drive shaft after selecting the correct gear/gears

Salmoneye


Coon Catcher Clay    Posted 02-05-2004 at 13:20:10       [Reply]  [Send Email]
you can get a motor that turns close to what you want and if you are belt driving a piece of equipment you can always use a variable speed pully on your motor


buck    Posted 02-05-2004 at 13:03:55       [Reply]  [No Email]

Well you can go down to the gadget get em store and get a little gismo that makes em run jest wher you want them to and a little more $ will tell you jest wher they runnin.


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