Motor Question

S

sokbok

Member
Location
Kansas City
Howdy forum.

We have a Frog CNC machine.
The motor that runs the dust collection keeps failing.
Service voltage is 3phase, 208.
The motor is getting L1, L2, and ground.
The nameplate indicates 17amps at 220Volts, so at 208 its 17.9.
Its a very dusty environment and I assume thats what is causing it to fail.
By my simple calcs, 17.9 x 1.25 = 22.47 amps, therefore 12 AWG min.

Attached is a pic of the motor.

Its a major pain not having the dust collection working.
The motor is currently on a 2 pole, 40 amp breaker.

Any recommendations on where to find a replacement motor?
Screenshot 2026-04-01 at 9.58.33 PM.png

thanks.
 
You said it keeps failing then laters asked where to find a replacement.

What exactly is happening when it "fails"

If you reset something and then it works for a while again then it probably just overloaded or the driven load possibly has some problem. If that is the case an identical replacement motor will likely end up doing the same thing.

Since you said this is a dust collector it likely driving a fan. Possibly not enough restriction on ducting allows too much air flow which will load the motor more? Possibly need to adjust inlet dampers or even completely close off collection ports not in use to lessen load on the blower?
 
zbang said:
Also ask your electrician about replacing that motor with a 3-phase motor since you have that service. (What does the manufacturer say about the failures?)
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if it is an OEM motor may need to get it from the manufacturer or be prepared to adapt to whatever is different from a general purpose motor. Special shaft size, threaded shaft, etc are common things that may require to go to an OEM motor.
 
Like LarryFine said: That motor is not a 3 phase motor. The nameplate says "1 phase" and it is fed power by a 2-pole breaker. That would make it a single phase motor. For motors there are numerous places to get them. I would try Automation Direct since they have a pretty good offering of motors for decent price.
 
retirede said:
Nothing on that nameplate indicates that this motor is a standard NEMA frame designation. From Taiwan, it could be anything.
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Good point. Would be best if OP supplied the manufacturer (if the motor even has a manufacturer label). Label has the serial number, but that doesn't give anything about this motor when looking it up. And if it isn't a NEMA frame, then it will probably be IEC. My best guess is it is actually an IEC frame size since "Class E" insulation is not a NEMA insulation class, but it is an IEC class.
 
The first thing I would do is get it off the machine and up on the bench and clean it out. Pull off the end bells if you feel confident enough or take to a motor shop if you don't.

The next thing to check is the bearings. Unless it's really new you might as well change them.

Getting a new motor or adding a buck/boost is way down the line. That motor is likely fine running on 208V.
 
DBill64 said:
Good point. Would be best if OP supplied the manufacturer (if the motor even has a manufacturer label). Label has the serial number, but that doesn't give anything about this motor when looking it up. And if it isn't a NEMA frame, then it will probably be IEC. My best guess is it is actually an IEC frame size since "Class E" insulation is not a NEMA insulation class, but it is an IEC class.
Click to expand...
220 volts isn't a NEMA voltage either. NEMA motors would typically be rated 230 volts.
 
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