240v 3 phase in 415v 3 phase motor

Home| Search | About

User Password

Lost Password?

Model Engineering in UK - Model engineering, metal crafts in UK

Bookmark this page: YahooMyWeb

Yahoo!

Google

Windows Live

del.icio.us digg

digg

Netscape

Subject

Author

Date

240v 3 phase in 415v 3 phase motor

04-17-2008

Re: 240v 3 phase in 415v 3 phase motor

Mark Rand

04-17-2008

Posted by dm on April 17, 2008, 6:03 am

Please log in for more thread options

This almost certainly been asked before - Can I run 240v 3 Phase in 415 3
phase motor providing a halving in power is ok for the application?

Derek

Posted by Mark Rand on April 17, 2008, 12:01 pm

Please log in for more thread options

>This almost certainly been asked before - Can I run 240v 3 Phase in 415 3
>phase motor providing a halving in power is ok for the application?
>
>Derek
>

You can, but the normal technique would be to reconnect the motor from star to
delta, which would then give you a 240V three phase motor. Most dual voltage
motors will have a diagram in or on the terminal box (it will have 6 terminals
if it is rewirable)

If the motor has been build permanent star, the star point can sometimes be
found and separated so that the windings can be reconnected in delta.

Mark Rand
RTFM

Posted by dm on April 17, 2008, 12:17 pm

Please log in for more thread options

Thanks
Alas these motors are permanent star -
Re butchering a permanent star to a delta
Since delta uses more current would the windings necessarily take the extra
current if I "hacked" it to a delta?

Derek

> >This almost certainly been asked before - Can I run 240v 3 Phase in 415 3
> >phase motor providing a halving in power is ok for the application?
> >
> >Derek
> >

>
>
> You can, but the normal technique would be to reconnect the motor from

star to

> delta, which would then give you a 240V three phase motor. Most dual

voltage

> motors will have a diagram in or on the terminal box (it will have 6

terminals

> if it is rewirable)
>
> If the motor has been build permanent star, the star point can sometimes

> found and separated so that the windings can be reconnected in delta.
>
>
> Mark Rand
> RTFM
>
>
>

Posted by Mark Rand on April 17, 2008, 12:38 pm

Please log in for more thread options

>
>Thanks
>Alas these motors are permanent star -
>Re butchering a permanent star to a delta
>Since delta uses more current would the windings necessarily take the extra
>current if I "hacked" it to a delta?
>
>Derek
>

The extra current comes because the windings are effectively in parallel
rather than in series. Same current and voltage for the windings but
SQRT 3 times the voltage and
1/SQRT 3 times the current
for the whole motor.

Mark Rand
RTFM

Posted by dm on April 18, 2008, 8:16 am

Please log in for more thread options

> >
> >Thanks
> >Alas these motors are permanent star -
> >Re butchering a permanent star to a delta
> >Since delta uses more current would the windings necessarily take the

extra

> >current if I "hacked" it to a delta?
> >
> >Derek
> >

>
> The extra current comes because the windings are effectively in parallel
> rather than in series. Same current and voltage for the windings but
> SQRT 3 times the voltage and
> 1/SQRT 3 times the current
> for the whole motor.
>
>
> Mark Rand
> RTFM

of the 4 motors on the mill
one is dual voltage already (suds) one I have a cheap replacement (vertical)
,
one is overspec and i'm not in rush for (horizontal arbour). The crucial one
is the horizontal feed. for this I have found the star point and it "seems"
straight forward to connect up as delta. Is there a way to get the physical
orientation out of kilter with the electrical topology or will it all come
out in the direction of rotation?

Similar Threads	Posted
Three phase plugs and sockets for 240v	June 21, 2008, 5:12 pm
Big 3 phase motor	August 15, 2006, 1:18 pm
3 phase motor as a generator ?	August 9, 2006, 12:50 pm
Re: NE1 help re dual phase motor please?	August 10, 2006, 9:50 am
Switched Two or Three Speed Three Phase Motor	April 1, 2008, 4:59 pm
3-Phase Distribution from Phase Converter	June 14, 2008, 3:50 am
O/T cost of 3 phase per unit	May 4, 2008, 3:44 pm
over clocking 3 phase motors	June 15, 2008, 6:16 pm
Inverter/3-phase drive for my S7	June 27, 2008, 6:59 am
myford super7 3 phase conversion (again)	March 2, 2008, 11:04 am

XML Sitemap