[Shop-talk] Need to find a speed controller for a 220v 1hp motor

[Tim Hoerning]

Inch, 

	If it’s a DC (universal) motor, you should be able to drive it with AC through a Variac (DC motors work on AC).    I have one that’s set up for 220v, but it will likely need to be rehoused.

	Are you back in NJ now?   Maybe we can get together soon and play with the Variac and motor.

	Thanks,

		Tim


 
> On Dec 11, 2017, at 4:58 AM, eric at megageek.com wrote:
> 
> Actually, I have a treadmill motor.  But how do I slow that down?  (I don't have any of the treadmill.) 
> 
> I can get another one if I need the whole thing. 
> 
> Thanks! 
> 
> 
> Sent from my Commodore 64 on a 2400 Baud Modem.
> Tech Viper
> "Be as beneficent as the sun or the sea, but if your rights as a rational being are trenched on, die on the first inch of your territory." Ralph Waldo Emerson 
> 
> 
> 
> From:        "Randall" <TR3driver at ca.rr.com> 
> To:        <eric at megageek.com>, <Shop-talk at autox.team.net> 
> Date:        12/10/2017 21:28 
> Subject:        RE: [Shop-talk] Need to find a speed controller for a 220v 1hp motor 
> 
> 
> 
> I think you're probably going to have to find a different motor for it.
> 
> Most single phase AC motors are simple induction motors, and they don't like
> being slowed down much.  You might be able to get 20 or perhaps even 30%
> without losing too much torque (or having the start switch close); but for
> cutting metal on a woodcutting bandsaw, you're probably looking for more
> like 90% reduction.
> 
> Another option might be to add a jack shaft and pulleys to step the speed
> down.  ISTR several articles in HSM on that topic.
> 
> As a side note, there are lots of tread mills (exercise machines) being
> thrown away with perfectly good 1 or 2 hp DC motors in them.  Generally it's
> the controller that fails, not the motor.
> 
> -- Randall 
> 
> 
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