575v motor supplied with 480v ?

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titan1021

titan1021

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Northern California
I've got a commercial client that just picked up a food sorter/sifter.

Its powered by a old Baldor 1/2hp 3 phase motor. The name plate shows 575v and there are no diagrams anywhere to show any other wiring or voltage options.
Haven't been able to get anywhere with Baldor and they have been bought out by ABB. We have 480v available, so I am wondering if it will run OK on 480 or not, of course its not ideal. There isn't a lot of load on this motor as it simply spins a counter-weight to create the vibration needed to create the sifting motion. Also wondering I could at least test it with 480v as they aren't sure that it still works.
I know a transformer is an option as well.

Thanks for any input.sorter1.jpgmotor1.jpg
 
When you don’t give a motor full voltage, it produces less torque, less at the square of the voltage reduction. So 480/575 = roughly 83%, so your peak torque capability will be reduced to about 70% of normal. Since synchronous speed remains the same, you HP becomes 70% as well.

If your motor was over sized by 30% or more it will be fine. Considering that the next motor size down from5HP is 3HP, that’s 60% less, so it is remotely possible that they needed just a little more than 3HP so they went to a 5HP motor and had a little fudge factor left to play with. If not, the motor slip will increase due to the lack of torque, the motor will pull more current while doing less work and will be subject to stalling.
 
titan1021 said:
I've got a commercial client that just picked up a food sorter/sifter.

Its powered by a old Baldor 1/2hp 3 phase motor. The name plate shows 575v and there are no diagrams anywhere to show any other wiring or voltage options.
Haven't been able to get anywhere with Baldor and they have been bought out by ABB. We have 480v available, so I am wondering if it will run OK on 480 or not, of course its not ideal. There isn't a lot of load on this motor as it simply spins a counter-weight to create the vibration needed to create the sifting motion. Also wondering I could at least test it with 480v as they aren't sure that it still works.
I know a transformer is an option as well.

Thanks for any input.View attachment 22477View attachment 22478
Click to expand...
I agree with others that it's better replaced with the right motor. Still, if you feel like using it and it is a vibrator motor, be sure to tweak the counterweights to lessen the torque requirement. Take note that your motor torque capacity will be about 70% compared to supplying the motor with full 575 V.
 
topgone said:
I agree with others that it's better replaced with the right motor. Still, if you feel like using it and it is a vibrator motor, be sure to tweak the counterweights to lessen the torque requirement. Take note that your motor torque capacity will be about 70% compared to supplying the motor with full 575 V.
Click to expand...

Thank you everyone for the advice. While I have done quite a bit of commercial work in the past 19yrs, I haven't come across this scenario as of yet. I can now explain this to my client, and being that this is an old piece of equipment they acquired I can put the ball in their court. Cheers
 
titan1021 said:
I've got a commercial client that just picked up a food sorter/sifter.

Its powered by a old Baldor 1/2hp 3 phase motor. The name plate shows 575v and there are no diagrams anywhere to show any other wiring or voltage options.
Haven't been able to get anywhere with Baldor and they have been bought out by ABB. We have 480v available, so I am wondering if it will run OK on 480 or not, of course its not ideal. There isn't a lot of load on this motor as it simply spins a counter-weight to create the vibration needed to create the sifting motion. Also wondering I could at least test it with 480v as they aren't sure that it still works.
I know a transformer is an option as well.

Thanks for any input.View attachment 22477View attachment 22478
Click to expand...

Looks like 375v to me.
 
sameguy said:
Looks like 375v to me.
Click to expand...

It does, but on close inspection that’s a corrosion spot. It’s 575.

Don’t know where I came up with 5HP... slipped a cog I guess. I agree, a 1/2 HP is not worth worrying over. I’d use it until it burns up, there is no secondary value for a 575V motor in California and shipping it to a Canadian eBay buyer is not worth it. Then when /if it burns up, replace it with a 460V version. If the down time is expensive, buy the replacement now and have it on hand.
 
Was going by the slant of the numbers top hat and thought some drive motor or other.
Funny Baldor/ABB not helping, just sign of the lazy times I guess; go buy a nice Chicom motor as backup.
 
sameguy said:
Was going by the slant of the numbers top hat and thought some drive motor or other.
Funny Baldor/ABB not helping, just sign of the lazy times I guess; go buy a nice Chicom motor as backup.
Click to expand...

I’ve had similar experiences with Baldor lately since being bought by ABB. They are even dumping the Baldor name now. It’s a shame, they had been a (literal) powerhouse in the industry for a long long time.
 
drcampbell said:
Seems a trifle optimistic for a 6-pole (1200 rev/min) motor, especially if it needs to have a washdown-duty enclosure for food service and tolerate a greater-than-average overhung load.
Click to expand...

The only thing I see in the pictures that points to anything special is the “M” suffix on the frame. That usually indicates a flange mount commonly used on oil burner pump motors. That said, I’ve never seen a 6 pole oil burner motor so finding this beast could be a problem.
I’d still try to find a replacement.
 
Jraef said:
It does, but on close inspection that’s a corrosion spot. It’s 575.

Don’t know where I came up with 5HP... slipped a cog I guess. I agree, a 1/2 HP is not worth worrying over. I’d use it until it burns up, there is no secondary value for a 575V motor in California and shipping it to a Canadian eBay buyer is not worth it. Then when /if it burns up, replace it with a 460V version. If the down time is expensive, buy the replacement now and have it on hand.
Click to expand...

Great points!

Thanks
 
retirede said:
The only thing I see in the pictures that points to anything special is the “M” suffix on the frame. That usually indicates a flange mount commonly used on oil burner pump motors. That said, I’ve never seen a 6 pole oil burner motor so finding this beast could be a problem.
I’d still try to find a replacement.
Click to expand...
The fact it has a spec no but no cat no, tells me it is an OEM motor made for the equipment manufacturer. Replacement motor might be easier to find via equipment manufacturer than it is to find from Baldor distributors.

One little trick that sometimes works is to find same sized general purpose motor and swap components. Chances are it doesn't have same shaft as a general purpose motor either though, but if the rotor is otherwise the same it may be able to be swapped also.

Good news is it is only a 1/2 HP motor and is more affordable to experiment with than if it were a 15, 50 or even a 200 HP motor.
 
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