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[4]

Is this a good candidate for RPC upgrade?

[3]
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dlane

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#2
Link didn’t work , for me
 

FOMOGO

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#3
Thanks for letting me know. Just tried it and it works for me, but will list the data here. Toshiba 3 phase, TEFC, 60 HZ, 1175 rpm, 230/460 V, 57/28.5 amps, 6 poles, max ambient temp 40 deg C, time rating-continuous, frame 286T, service factor 1.15
 

JimDawson

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#4
Never heard of a 6 pole motor being used for a RPC, but I don't know why it wouldn't work. I suspect the reason that they are not used is because they are not very common, and more expensive than a 4 pole motor.
 

JohnG

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#5
I've built RPCs with both 3450 and 1725 rpm motors, and they worked exactly the same. A slower speed motor develops higher torque to deliver the same power as a higher speed motor, so the rotor will be heavier. I think that accelerating the heavier rotor puts more stress on the starter capacitor and that the heavier rotating mass helps when starting a run motor under load like a compressor or hoist. That's seat of the pants observation, not the opinion of a trained electrical engineer.
 

markba633csi

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#6
Makes sense to me, and I've been toilet trained, for the most part
 
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