reversing an AC motor

[Cyrus]

I've been trying to reverse the direction of an AC fan motor without
taking it apart and changing things.

It doesn't have any brushes, it is just a solid core inside an
electromagnet.
Looking at the surface of the core, it has steel bars in a step
pattern.

I want to control is with a uC in both directions. I'm thinking it
might be possible to reverse it if I change the 60Hz frequency to
perhaps 120Hz- but if anyone knows, they could save me lots of trouble
: )



Cyrus

 

[JeffM]

reverse the direction of an AC fan motor
without taking it apart and changing things.
Cyrus

Aren't you fascinated by folks who think they're the 1st with an idea?
http://groups.google.com/groups?&q=reversing-an-AC-motor
http://groups.google.com/groups?&q=reverse-an-AC-motor

The answer is "No".

 

[Cyrus]

JeffM wrote:

reverse the direction of an AC fan motor
without taking it apart and changing things.
Cyrus


Aren't you fascinated by folks who think they're the 1st with an idea?
http://groups.google.com/groups?&q=reversing-an-AC-motor
http://groups.google.com/groups?&q=reverse-an-AC-motor

The answer is "No".

I read all of those posts before. I know the idea of reversing a motor
is not new, and I know how to search google.

I think the words I'm looking for are "smart" and "ass".


If you think it's impossible, that's fine, I thought it might be.

 

[Dbowey]

Cyrus posted:

<< JeffM wrote:

reverse the direction of an AC fan motor
without taking it apart and changing things.
Cyrus


Aren't you fascinated by folks who think they're the 1st with an idea?
http://groups.google.com/groups?&q=reversing-an-AC-motor
http://groups.google.com/groups?&q=reverse-an-AC-motor

The answer is "No".

I read all of those posts before. I know the idea of reversing a motor
is not new, and I know how to search google.

I think the words I'm looking for are "smart" and "ass".


If you think it's impossible, that's fine, I thought it might be.
------

It appears clear to me, after reading the google finds, that it *IS* possible.
Also, I have AC motors that are reversible via a switch at the motor.

They are NOT reversible, however, "without taking it apart and changing things.

You need to spend some time on reading comprehension.

Don

 

[Charles Schuler]

Sounds like a shaded-pole motor. Not easy to reverse!

 

[Watson A.Name \"Watt Sun]

Cyrus wrote:

I've been trying to reverse the direction of an AC fan motor without
taking it apart and changing things.

It doesn't have any brushes, it is just a solid core inside an
electromagnet.
Looking at the surface of the core, it has steel bars in a step
pattern.

I want to control is with a uC in both directions. I'm thinking it
might be possible to reverse it if I change the 60Hz frequency to
perhaps 120Hz- but if anyone knows, they could save me lots of trouble
: )

It's a one way motor by design. You have to use gears or pulleys to do
the reversal.

> Cyrus

 

[Jamie]

it depends on the motor.
you need to look at it.
if is a shaded pole type you
may be able to find the smaller winding section
which makes a slite offset for the start up and
direction control and reverse the wires.
the problem is in alot of those motors is the
stator part that you need to get to is barried.
they some times wind the shaded pole first because its
a small mass then place the primary windows on tap so
that you can't get to them.
if you look at the outter core i think you may find what
i am taking about and also look at the arm..



Cyrus wrote:

I've been trying to reverse the direction of an AC fan motor without
taking it apart and changing things.

It doesn't have any brushes, it is just a solid core inside an
electromagnet.
Looking at the surface of the core, it has steel bars in a step
pattern.

I want to control is with a uC in both directions. I'm thinking it
might be possible to reverse it if I change the 60Hz frequency to
perhaps 120Hz- but if anyone knows, they could save me lots of trouble
: )



Cyrus