Electric motor question

[Kirby Bletcher]

Hi guys,

This is a tag off my GK-21 Deckel pantograph motor. Can anyone here tell me the HP rating from the information on the tag?

Thanks very much!

Kirby


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[Ray Rogers]

I don't think the horsepower is specified on there, not even in metric terms but I could be wrong. However, the voltage and amperage are quite clear and from that I would conclude that the motor is well under one horsepower. That seems reasonable to me anyway as I wouldn't expect a pantograph to need a lot of power.

So, if that seems reasonable to you (you're there, I'm not) then I'd look for any 1/4 or 1/3 or 1/2 hp motor that will bolt up and give it a try. I'm having to assume you need to replace this motor since you didn't say what the problem is but it seems likely. The only other question is what rpm is needed and, again, I can't tell unless that 1660 refers to the speed. In that case I'd try for a 1725 rpm motor.

Now, if you come back and say"but this motor came off a 3000 lbs industrial pantograph in Yugoslavia" then I guess we both know what happens when we start making assumptions.....

[Ed Tipton]

Kirby...I also am not able to read the data plate, but I do agree with what Ray has said. I can tell you that the motor on the Gorton machines I ran were fractional HP. Given the usual type of work asked of a pantagraph machine, I think that about any common motor larger that 1/4 HP and 1725 RPM would work just fine.

[Kirby Bletcher]

Ray & Ed,

Thank you both for the reply. It is about a 1500lb pantograph mill. The motor certainly didn't look very large. The reason I was looking for the HP rating is because I wanted to price a VFD. Not sure that's the way I'm going yet, may be it is just easier to put a new motor on it and be done. I'm guessing from your input a 1/2 horse 220v 1725rpm should be plenty. I think Ill unbolt it and take it to the local motor shop.

Thanks again

Kirby

[Ron Aggus]

Kirby,
multiply the kilowatts (KW) by 1.341 to get the horsepower. That would mean at 220V the horsepower would be .4x1.341=.5364 and the horsepower at 440v would be .48x1.341=.64368 horsepower.

[Kirby Bletcher]

Thanks Ron! I thought there was a formula to figure that out.

Kirby