Re: Sewing machine motor - reversing direction

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Matthew Smith by way of Terry Fritz <twftesla-at-qwest-dot-net>" <matt-at-kbc-dot-net.au>

Hi All


---8x------

> Unless your motor has a seperate series or shunt coil, and an armature coil,
> reversing the connection to the brushes won't reverse the direction of the
> motor, since the power to the motor is AC.  The current is reversing
> direction constantly - it switches every ~8.33 mSec.  

---8x------

If this is a universal motor, as someone mentioned in another post, how 
about rectifying the supply?  You could then use something like an 
H-bridge (or just a DPDT switch if you don't want to get electronic) to 
control direction.

Cheers

Matthew Smith