Convert 220V 2 pole induction motor to 110v

[novellsuse]

Hi,
I have a simple question. I have a 220V 3450 rpm(2 pole) induction motor that is ONLY wired for 220v. What I would like to do is run the motor on 110v. I have a reason for this which I really would not like to get into. Both poles are currently wired in series. If I opened up the motor and soldered a tap between the 2 poles and then joined together the other 2 remaining leads from each pole and ran the poles in parallel, That would allow me to operate the motor at 110v? Is that correct? Of course I would be using double the current from 220v operation. Thanks, Doug

 

[SteveKW]

Sounds like you have it right!
What about the start winding?
Is it in series too?

 

[SteveKW]

Woops...You don't have it right!
You need to OPEN that crossover between the two poles.
Then, placing the stator upright with one pole at the top and the other at the bottom, connect the pole leads on the right together and the leads on the left together.
Those are now T1 and T2.
Again, how are the start windings connected?

 

[novellsuse]

Steve.....I appreciate your time on my question. I'm wondering why I should open the connection between the 2 poles, only to re-connect them back?? My intention is to parallel the 2 poles then apply 110v. Also, yes the start windings are also in series.

 

[SteveKW]

Hmm. Your not opening one connection just to reconnect the same wires.


These very crude diagrams may help.

This is what you currently have...

-> North, current flows right side of stator
T1 > ===
. /
. /(crossover)
. /
. ===--- T2 ->
. -> South, current also flows to the right.


Current enters T1 and exit out of T2.

____________________________________________________

This is what I think your telling me what you want to do?

. <-- (see how this arrow changed direction to LEFT?)
T2 < ===
. /
. /<--(crossover) NEW T1 this wont work!
. /
. ===--- T2 ->
->

______________________________________________________

This is what it is supposed to look like in parallel!


. N->
. =====
. / \
T1->-- ---T2 ->
. \ /
. =====
. S->
.

Note how the current still flows left to right.

 

[SteveKW]

The start windings will have to be connected the same way if the start circuit is "across the line" too! As for the capacitor... I forget if you go up or down in the mfds?

Does the start circuit connect to the RUN crossover?

 

[motorsdirect]

Hi.
This all depends on how your motor is originally connected...do you have two completely seperate windings with 2 leads on each, or are they internally connected.??
You may or may not need to reconnect the start windings too, and if you do, you will need to change the capacitor!!

Jeff

http://www.motors-direct.co.uk