530kW motor checks? !!

Zoomup:

Big motor bearings...

https://www.youtube.com/watch?v=ncvX2K7pbjw



Z.

I'm a bit surprised to see a hammer being taken to the end casting like that, I;d have expected there to be holes to put bolts in that push or jack it away from the frame in a far more controlled way - hitting it like that is nasty.  Actually that is not quite  as big as the OPs with a shaft that looks like it is 2.5-3 inch dia I think that will be  more like 100- 200kW machine - we can't easily tell if it may be 1500 RPM or 3000.

Bigger machines have eyebolts for the overhead hoist to take the weight, so the end casing does not drop and crush someone's feet !


Note that big motor tests have scope to be  quite hairy - the rotating intertia of the rotor is large and remember that if for any reason it starts or stops suddenly the twisting forces on the stator  and rotor are equal and opposite - both ends of the magnetic field push so to speak, so the whole machine can rotatate itself off its mounts if not well fixed. A similar problem can occur with a genset if you manage to create a fault condition that causes the rotor to lock -  the rotor locks relative to the stator all right, but that does not stop them both rotating at about half the speed it was doing when the rotor was moving and the stator was still. 

The world of big has challenges for which there is no parallel in the  smaller scale.


If this is a 'squirrel cage' machine it will work as an induction genset of sorts but you need to give it a reactive load to make it do that - the maths is quite involved, and the output frequency is not quite the rotating speed, as the currents in the rotating core are at the difference frequency. 

Such gensets can be made more compact than their brushed counterparts, and are very good with pulsed loads, but they are harder to regulate as voltage frequency and load reactance are inextricably linked.

Being intended to motor, it will not be optimum in reverse, but it will do something.

M.


 

Zoomup:

Big motor bearings...

https://www.youtube.com/watch?v=ncvX2K7pbjw



Z.

I'm a bit surprised to see a hammer being taken to the end casting like that, I;d have expected there to be holes to put bolts in that push or jack it away from the frame in a far more controlled way - hitting it like that is nasty.  Actually that is not quite  as big as the OPs with a shaft that looks like it is 2.5-3 inch dia I think that will be  more like 100- 200kW machine - we can't easily tell if it may be 1500 RPM or 3000.

Bigger machines have eyebolts for the overhead hoist to take the weight, so the end casing does not drop and crush someone's feet !


Note that big motor tests have scope to be  quite hairy - the rotating intertia of the rotor is large and remember that if for any reason it starts or stops suddenly the twisting forces on the stator  and rotor are equal and opposite - both ends of the magnetic field push so to speak, so the whole machine can rotatate itself off its mounts if not well fixed. A similar problem can occur with a genset if you manage to create a fault condition that causes the rotor to lock -  the rotor locks relative to the stator all right, but that does not stop them both rotating at about half the speed it was doing when the rotor was moving and the stator was still. 

The world of big has challenges for which there is no parallel in the  smaller scale.


If this is a 'squirrel cage' machine it will work as an induction genset of sorts but you need to give it a reactive load to make it do that - the maths is quite involved, and the output frequency is not quite the rotating speed, as the currents in the rotating core are at the difference frequency. 

Such gensets can be made more compact than their brushed counterparts, and are very good with pulsed loads, but they are harder to regulate as voltage frequency and load reactance are inextricably linked.

Being intended to motor, it will not be optimum in reverse, but it will do something.

M.