Motor Identification

Is it possible to find specifications of an unknown AC motor?

Posting a photo here might help. Otherwise, far too many options.

Need at least a visual inspection to try to narrow down options:

DC (shunt,series,compound), DCPM, DCPM brushless, DC variable reluctance, AC synchronous, AC induction single phase (shaded pole, cap start, cap run, switched start), AC induction three phase...

More information is needed.

There are not too many things that you can find easily.

Assuming it is an AC Indi=uction motor, and not prehistoric,

Get the base dimension (hole size, pitch, shaft diameter, etc) and then try to match with the sizes given in different Frames, you may hit it in power.

Otherwise it just becomes difficult. It is difficult to tell you to measure the insulation thickness, copper cross-section, iron circuit parameters etc and back design to get the motor data.

may be you can send this to fossil study(palaeontology) scientists. They can find out.

I will wait for two more days for a good answer. if nobody knows it properly, i will sell it for copper price and get some beer........cheers

"I have a car. No year, make, or model information. No markings or vin number. Don't know if it's diesel, gas, electric, or something else. Don't have any keys. I want you to tell me detailed specs about this car and don't ask me any silly questions about it that might make me have to do any work or use my brain."

If you cannot be bothered to supply even the tiniest bit of information about your motor, why are you wasting your time (and more importantly ours) asking the impossible? Don't bother waiting for two days, just take it to a local scrap yard now.

Nobody waste your time. If you dont know, keep quite.Did anybody compelled you to reply here...

With that atitude why waste our time?

I know to find the details, if there ia any hint. You beleive me, this is the real status. No data about the motor. What is the practical way to find the motor parameters??...may be local motor winding shop technicians will do based on their experience. But what can an engineer can do here?...Are you an engineer??

There are many Engineers here as well as experts in industrial, mechanical, and electrical devices of all kinds. If you could have posted something as simple as a photo, several people might have been willing to help you. Good luck at the metal recycler.

That's really stupid. You could have said whether there was a capacitor or not, and you could use a ruler to take some measurements, and you could count the number of wires going into the motor, and you could share this information.

THIS IS AN ENGINEERING FORUM NOT ASTROLOGERS OR FORTUNE TELLER.

Post number 3 gave you some good hints, same as Tornado did, but you didnt even bother yourself to read it. you just challenged the forum by giving us two days.... Dont wait two days, go now to change it against a beer.

I will revert the title of your post from " how to understand" to " how to make someone to understand"

nobody can make you to understand if you are not able to understand

the two days ultimatum is over.... I like to know what price you got from selling your motor to a scrabbyard!!

Cheers

Not only that, but some pictures might help. A while back someone on CR4 had a mystery motor, but he posted a picture that showed an unusual hole pattern in the fan shroud, together with an uncommon green color and an extra-large junction box. JRaef quickly identified it as a Grainger (Dayton) farm duty motor, and explained its characteristics. If you want good information, recognize and give all that you have.

Try to find out its duplicate in market and it may help you like this or post a picture of this..

with regards,

H.E

Hey guys found good place to buys these. Mite help read minds.

You at least have to know the voltage system of the motor. Then you can find the KW (or HP) from the following approaches:

(1) Starting current approach:
Start the motor with full voltage and try to measure the starting current. It will be difficult to record it because starting current lasts less than 5 seconds. Measure it at least 5 times (with half an hour time gap between each start) and use the average starting current value.
Full load current = Starting current / 6
Motor KW = 1.732 x FLA x 0.8

(2) No load current approach:
Start the motor with no load and measure the no load current
Full load current = 3 x No load current
Motor KW = 1.732 x FLA x 0.8

(3) No load power approach:
Start the motor with no load and measure the no load power
Assuming Full load efficiency as 90%, the no load power is 10%. So, the KW = (No load power) / 0.1

(4) Motor frame size approach:
Measure motor dimensions and find the frame size.
Find the KW from the simillar Frame size

Find the average KW found from all of the above methods and the motor KW is the immediate lower standard KW rating of the value found.

See also http://cr4.globalspec.com/thread/43648

- MS

I suuggest to all posters not to waste their time anymore with this thread, nothing serious on it, and administrators to close it....

the poster didnt show up since 2 days

iguess he is reading the posts and laughing on our naivity replying him

cheers

How can we identify this before giving power whether it is 60Hz or 50Hz motor?...measuring the windings value can be a good input?...(Please ignore the post#18.)

Can you identity the make of the motor. The manufacturer. What size is it?. When did you purchase it. Keeping all aspects in hand kindly retrace your steps. It may help you identifying the motor. I dont think I can answer your question because i havent seen your motor to guess what type it is. Neither have you given any details. Without seeing or knowing anything about it one can not establish its make and type. I hope that if you are sincerely asking this question you would ask in such a manner so that the people answering have a fair chance. Guessing is not good and will cause more harm. I hope that you try to understand my perspective and get more details.

Regards,

DG EE