Thanks for that info. I'm not sure if their methods would work for us.
One other possibility would be for us to use our existing stator and rotor stamping and just create a longer stack length.
We might be able to increase the length 20%-50%. Are there other considerations when varying the...
We are a manufacturer looking to redesign an electric motor that we currently produce. It is a 2hp 3phase squirrel cage design and we are interested in something with 3-5 HP. Can anyone recommend a good consulting service or another good first step? We have been checking with a few lamination...
Very helpful. Thank you. Yes, we use a inverter duty, spike resistant magnet wire. So that makes sense. But we used what I think is one of these older pulse generator VFDs in the past and found that. although the frequency and voltage were correct, the motor drew more amps than on regular...
We manufacture a three phase induction motor, 230VAC, 250 Hz. It operates on a VFD for variable speeds. Normal operation is about 200 Hz and 200 volts. The proper ratio for the drive is about 1:1, Hz to Volts.
I have a overseas customer asking the following question:
Are the windings strong...
Gentlemen,
Thank you for the valuable input.
The above mentioned article confirms what we learned the hard way some years ago about the problem of using a non-magnetic stainless motor shaft on our two-pole motor. Our amps were 3-4 x higher using a 300 series ss, than when we switched to...
Looking for a motor shaft steel that can be case hardened and will resist breaking from fatigue/vibration. We've been using 316 pre hardened stainless steel. But I'd like to get something with higher iron content. Leaning toward 1144 or 4140 any input is much appreciated
Zlatkodo, you wrote, "- Probably it is about a simple reducing the number of turns per coil in Hz-ratio ie. to 250/400 = 62,5 %. It can not be done just like that.
It is much more complex than it seems at first glance."
Can you elaborate?
What do you think of Waross' ideas of adjusting the...
Thanks for the helpful replies. Yes, for modifications the turns per coil were reduced and the wire size increased. The rotor is laminated, silicon steel with double bars. FYI, the stator laminations are also bonded rather than welded for improved efficiency.
I like the idea of trying the...
We currently manufacture a specialized, compact 2 hp, 230 VAC three phase induction motor. It is designed for variable speeds up to 250 Hz, or about 15,000 rpm. It runs at about 2.5 amps, no load at this speed and requires only about 15psi air to operate under a working load of about 5.5 amps...
Thank you very much for the helpful replies. It sounds like Inpro-Seal may have a Labyrinth Seal suitable for our application. I was impressed with their customer service. A regional manager has scheduled a visit our site to look into this, first hand...
We manufacture a specialty compact 2hp induction motor with variable rpms-- approx. 1800 rpm - 14,000. We need to make the motor waterproof. We have had only limited success with a lip seal and the mechanical seals I've seen are not capable of these high speeds. In fact we would like to adapt...
Thanks for the helpful replies. I consulted with a metalurgist yesterday who suggested that basically I'm screwed. But the best option he thought would be to make the shaft from 430 solenoid quality SS and have it nickel plated. He didn't mention 13-8 but he did mention that 17-4 has poor...
We manufacture a specialty elec. motor that requires the shaft to have good magnetic properties but we also need good corrosion resistance. We've been using 416 stainless steel (7/8" rod). but it is not standing up to the corrosion of the salt water environment.
Question: will 17-4 stainless be...
We build a high speed 3ph 220vac inductive motor using a rotor with copper bars and end rings (about 1.5" in diameter). Historically we have used C110 copper for the end rings but it is terrible to machine and drill. I would like to switch to c145 as it is much easier to machine. Question: is...
Attached is a photo of the print for our stator lamination with most dimensions. All in inches. Again, designed as a 2 hp motor at 250Hz. We're attempting to apply it to a new application in which it will be running on a VFD at 20Hz - 120 Hz. The voltage at 120Hz will be about 115v. Amp load...
Well we figured out the problem and it's a little embarassing...
Now that we see it, it seems obvious:
Our motor is a high speed motor designed for a top Hz rating of 250. When we run it at 480v and 250 Hz. the amp draw is fine -about 1.6 (what we expected).
When we run it at 120 Hz, as we...
Electric Pete wrote:
"If 240vac worked fine, it's hard to see where the problem is on the 480vac, unless there was a miswiring or a failure."
I agree and this is what has us baffled. We tested two 480 motors and both performed the same. As mentioned, we fried already. The remaining one was...
