Post by thread:[EE]: Induction motor connections ?

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/ -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

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! ******************************************************************** This email and any attachments are confidential to the intended recipient and may also be privileged. If you are not the intended recipient please delete it from your system and notify the sender. You should not copy it or use it for any purpose nor disclose or distribute its contents to any other person. ******************************************************************** -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

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}>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! > > > >******************************************************************** >This email and any attachments are confidential to the intended >recipient and may also be privileged. If you are not the intended >recipient please delete it from your system and notify the sender. >You should not copy it or use it for any purpose nor disclose or >distribute its contents to any other person. >******************************************************************** > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

> 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. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.