Old motor vs new motor

Whiskey Bent · Feb 4, 2017

The shop I work at gave me there old air compressor that has a newer 3 hp 3 phase motor on it. I have a very old 3 hp 1 phase motor im going to put on it. Should I buy a new motor or use the very old motor? The old one is much bigger and heaver than a new one, are they less efficent or just made better?

David G · Feb 4, 2017

It is both, less efficient, but built heavier. I would probably run what you have until it fails.

wisbaker · Feb 4, 2017

Both less efficient and made better. The difference between some of the new high efficiency stuff and the older less efficient motors can often pay for the new motor in about a year, that's in industrial
settings with 1,000-2,000 hours of use per year

David G · Feb 4, 2017

I would agree, probably never pay off difference in efficiency with occasional use.

dzc3 · Feb 4, 2017

I would check RPM & watch your amp draw, and pulley diameter

Bob - MI · Feb 4, 2017

Can you use the 3 phase motor it came with? To me if you have 3 phase capability stick with it especially if it's a newer design.

El Hombre · Feb 4, 2017

I've got a 1hp compressor built in 1947, and a 7.5hp compressor that is current production. Both motors are about the same size.

Maybe the technology of building motors has advanced in the last 70 years?

Old motor vs new motor

Whiskey Bent

Member

David G

Well-known Member

wisbaker

Well-known Member

David G

Well-known Member

dzc3

Member

Bob - MI

Well-known Member

El Hombre

Member

Similar threads