# Rewind An Ac Motor For A Change In Voltage And Frequency

## Recommended Posts

Hi Guys,

Hope an experienced motor winder can help me with a question.

I have a 230volt/50HZ 2 speed single winding motor connected Y/YY.

It has to be changed to 690volt 60 HZ with the same internal connections.

The original 230volt windings have 8 turns per coil and a c.s.a. of 3.6 sq.mm.

I calculated the 690volt/60HZ winding would need 20 turns per coil and a c.s.a of 1.44 sq.mm.

Am I far off the mark & what would be the effect of the change on the nameplate full load amps?

Thanks!

##### Share on other sites

• 1 year later...
You must see:
##### Share on other sites

Hello ankervik

Looks pretty good to me.

Best regards,

Mark.

##### Share on other sites

• 5 months later...

hi zlatkodo,

i've seen your video and it's really helpful. but, how can we get the form?

thanks.

##### Share on other sites

Not that you nead somebody else to ok, but yep

230/690 * 3.6 = 1.2 csa (Volts go up, current must come down so power remains the same)

690/230 * 8 = 24 turns (csa decrease turns must increase for same magnetic field - well thats how I see it)

then if going from 50hz to 60hz then turns must go down being 50/60*24 = 20 turns

love re arranging formulas makes me feel like I know what I'm doing )

good luck

##### Share on other sites

• 1 month later...
hi zlatkodo,

i've seen your video and it's really helpful. but, how can we get the form?

thanks.

Zlatkodo

##### Share on other sites

• 5 years later...

I think this will offer some help www . diyelectriccar . com/forums/showthread.php/ac-induction-motor-rewind-higher-frequency-39614.html

Alvin78

## Create an account

Register a new account

• ### Who's Online (See full list)

• There are no registered users currently online
• ### Tell a friend

Love LMPForum? Tell a friend!
×