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'[EE]: Induction motor connections ?'
2002\01\28@003131 by arpit

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Hi, I have a large induction motor used to spin the drum of a photocopier. I scavenged it when I was about 10, and now 5 years later, I don't remember what the connections were. I has three wires. I remember hooking one to earth a couple of years ago and getting a very severe electric shick from it. Since then I have learnt that it probably needs a starting capacitor, for when I hook any 2 of the leads to the mains, it just sits there and hums, until I start it off on either direction. I have no idea about the connections to the starting capacitor though.

The resistances are as follows:

white-black  56ohms
white-grey   155ohms
Grey-black  100ohms.

On the package it has the following technical information:

Induction Motor
hz-50
v-240
kg/cm-33.6
rpm-90.5
uF -3

I have located a 480 volt 3 uf capacitor which probably came from the same photocopier.  Could someone please enlighten me as to how to connect it?
Thanks, Arpit.
Photos of the motor are on my website at http://members.optushome.com.au/arpit/

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2002\01\28@055936 by Mike Blakey

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From your post, you could try this....

When playing around with this sort if equipment, it is a good idea to put a 60W
lamp in series with the LIVE.
That way, if you short-circuit or connect the motor incorrectly, you wont blow the
motor or the supply fuse.


                                    | |
                                    | |
                       +------------| |-------------------Grey  +
                       |            | |                         )
                       |            | |                         )
                       |                                        )
                       |            3uf                         ) 100 Ohm
                       |                                        )
                       |                                        )
                       |                                        )
live 240vac ------------+----------------------------------White +
                                                                )
                                                                )
                                                                )
                                                                ) 55 Ohm
                                                                )
                                                                )
Neutral ---------------------------------------------------Black +


Earth -----------------------------------------------------Case

Dont forget to EARTH the Motor CASE, AND the capacitor IF it has an EARTH tag.

Take Care switching these things, they are inductive and can bite!



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2002\01\28@061956 by arpit

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Thankyou very much for your tim and trouble to put together the diagram. I will try it tomorrow.

*********** REPLY SEPARATOR  ***********

On 1/28/2002 at 10:07 AM Mike Blakey wrote:

{Quote hidden}

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2002\01\29@145955 by Peter L. Peres

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> white-black  56ohms
> white-grey   155ohms
> Grey-black  100ohms.

White is common, black is phase and the cap goes between black and grey.

I may be wrong however, the connections could be the other way around. You
use this at your own risk.

Peter

PS: The rationale is, that the larger resistance winding uses less current
and/or has thinner wire and should be connected to the cap. The lower R
one will have lower I^2R losses so it is most likely to go directly to the
mains phase.

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