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Re: Sewing machine motor - reversing direction



Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Esondrmn-at-aol-dot-com>

In a message dated 2/16/02 7:17:30 PM Pacific Standard Time, tesla-at-pupman-dot-com
writes:


>
> Hi:
>
> Has someone found uses for common sewing machine motors in 
> Tesla coiling? 
>
> But specifically, I would like to know how to reverse the
> rotation direction of one that I have here. I plan to use it
> to drive a static machine, but observed that it is rotating
> in the wrong direction for my plans. I didn't open yet one 
> that I have here to see what is inside. The motor is powered 
> by two wires, at 110 V AC, one of them passing through a speed 
> control device that appears to be just a pressure-sensitive carbon
> resistor.
>
> I imagine that it's just a question of reversing the connections
> of the brushes, but would like to know if only this works.
>
> Antonio Carlos M. de Queiroz




Antonio,

Sewing maching motors are usually series wound motors that can be operated with
either AC or DC.  One of the armature windings inside the case is connected to
one field winding.  The other armature winding and other field winding is
brought out for the AC line input.  Take the case apart and reverse the
connections to either the 2 field windings or the two armature windings and it
will run in reverse.

Ed Sonderman