Gallery, Projects and General > How do I??

Does squirel cage AC motor survive shaft removal from rotor?

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PekkaNF:
This might be a daft question, but how likely it is to press short shaft out of AC motor and press somewhat longer shaft home without degrading motor?

The motor is sandard squirel cage (induction) motor of 1,1 kW, three phase. I have several option and I'm very tempted to modify motor heavily and keep rest of the contraption simple.

I tried to google it but I'm not convinced.

Has anybody tried it and how did it go? Is there any tricks or something to avoid?

Pekka

awemawson:
John Stevenson is the man to ask, as he is repairing and modifying motors all day long as his day job - no doubt he'll be along in a while  :med:

Manxmodder:
Pekka, I have done this type of modification to 2 motors and they both worked fine after.

One was for a small bench drill press and the original motor was burned out. I had another similar sized motor but the shaft rotated in the wrong direction,so I pressed the shaft out and reversed it relative to the rotor.

The second one I made a shaft for as I needed a much longer shaft nose than the standard one to mount a multi vee pulley on.

If the press fit doesn't feel tight enough when you re-assemble then use a bit of loctite retainer on the shaft just as the last couple of inches of pressing is being carried out.....OZ.

awemawson:
I had always assumed that the rotor laminations had a keyway in the stamping - just shows what happens when you assume  :lol:

mexican jon:
As Manxmodder has said it is perfectly doable we quite often do it with large motors in the oil industry, if the drive end of the shaft has been damaged. I've done it with small motors as well normally when I was skint or to tight to buy the correct motor  :lol:

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