50Hz motor on 60Hz power

Old 05-24-03, 12:28 PM
Visiting Guest
Posts: n/a
50Hz motor on 60Hz power

Another question regarding the 220V 50Hz silent compressor I mentioned in my other post about Step-Up transformers:

I have received conflicting answers on this question so I thought I would ask her also. From what I have researched it seems that a 50Hz electric motor will run allright on 60Hz power here in the U.S. but vice versa will damage the motor quickly. Would you concur with that?

I called the U.S. branch office of the company that sells this compressor and asked the technician if I could run it on 60Hz power. He said he would have to check and then came back to the phone and told me that it "should be OK to run on 60Hz."

I am wondering if that is the truth or if he just asked someone who may or may not have known?

I also called another company that makes compressors almost exactly the same as these and the technician there told me that running it at 60Hz will work but that it will probably only last a year or so.

So now I am wondering who is right and who is wrong?

I appreciate any input you may have.


Old 05-24-03, 12:59 PM
Join Date: Sep 2000
Location: United States
Posts: 17,733
Upvotes: 0
Received 1 Upvote on 1 Post
I think you got the right answer from both of them.
Old 05-24-03, 01:56 PM
HandyRon's Avatar
Join Date: Dec 2001
Location: New York
Posts: 1,287
Upvotes: 0
Received 0 Upvotes on 0 Posts
The frequency change will affect the RPMs of the motor. You should see a 20% increase in speed. That may (probably) afect the lifetime of the motor.
Old 05-24-03, 05:49 PM
Join Date: Sep 2002
Location: welland ontario
Posts: 8,059
Received 521 Upvotes on 426 Posts
Here's my thoughts.
I will run. It will run faster. If it is belt drive you should consider a pulley change to keep the compressor speed back to normal. It might not last as long as if it was on 50Hz. Are you going to buy a new motor? What will you do with the old one. Probably can't rid of it. With this in mind I say run it as is and see how long it lasts. In the mean time keep an eye out for a deal on a new motor or wait until it blows and buy one then. It might last a long time.
Old 05-24-03, 05:59 PM
Visiting Guest
Posts: n/a
Thanks everyone for the input.

Since this motor is only rated at 2.9 amps at 220V would that make any difference to the life of the motor since it is such a low amperage?

One other thing: Why are some motors rated for 50/60Hz?

Do these motors rated for both frequencies last longer at one frequency then they do the other?


It is not belt-driven. It is a sealed, oil-filled compressor made in Denmark.
I am not going to buy a replacement for this thing as they are very expensive. Just the 1/2 hp motor/compressor head unit is over $800 new. Here is a link to them if you are curious as to what they are:

Jun-Air compressor

Old 05-25-03, 06:59 PM
Gary Tait
Visiting Guest
Posts: n/a
Why are some motors rated for 50/60Hz?

They are either a universal type motor (like in a portable
power tool), or their design is optomised to work on both

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: