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Ok I tested the power there is very little A.C. looked more like niose on the scope almost impossible to even see. I ran a test at work also the solid state has some A.C. coming though. We have a generated D.C. that we use also it has a clean output we are going to look into this. The gear head...

We are going to test it tommorrow. THe comutator is not that bad it whiped out the brushes though. It was not tested under a load. It has been in service since december Gusd. Cbarn and Farkel they told me that the gear box was just rebuilt. We do have a dino I will see if we can load it down...

I inspected a D.C. motor 150 H.P. . It was shiped in december and has been runing since then. My qeustion is how clean is the D.C. coming from the power supply sappose to be. It is a A.C. rectified into D.C. unit. I have been told it is common for this type of unit not to have pure D.C.. To me...

As stardelta has said when you assemble them are your parts marked. On some small motors the stator looks centered but it is not it may be a .25 of a inch to one side. Look at your rotor with one endbell on see if it lines up lamanation to lamanation.

Henkv sometimes the insulation is damaged when the coils are inserted it probable had no cell liner (just geussing). If you have the opportunity look in the slot before it opposite rotation see if one of the lamanations moved. It only takes one to put pressure on the next slot. It may have just...

Yes pete that is correct the upper bearing actuallyholds the load from what I have seen during the first run after a new bear we would lift the shaft to take off the stress from the first run. I do not know the amount of float it needs but it must have some. That is a common bearing setup for...

I have seen this swing test done by machanics that I have worked with. From what I was told this test tells how much play is in the endbell they had no wieght or force requirements. They would push on it and take the measurment. Depending on the bearing design some of the outer races acctually...

At forty cm from the slot there is possible a iron ring used to handly the surge. When large motors start under any load the windings do move out-ward because the energy developed to rotor from the stator core to the rotor core is at the point of saturation in the rotor. Once the rotor rotates...

One qeustion for you is this coolent water or chemical? Acctually two qeustions the cooler located above the motor and does the air get blown in or is it from rotor air flow. If you could give a outside picture or the motor also so I can see where the air vents are. One picture of the rotor...

Pete the bigest thng is there are standards I call them bonderies. Make sure whatever you do you try to taylor them to your in inviorment.

vandergraf roller is a self contianed unit, the motor runs in oil with the acctual gears within the roller itself. Ok it is not a vandergraph. That changes it a little. Are the heaters on the winding or in the endbell. Ok in such a slow speed motor such as that one the are many recurculating...

temp/humidity enviroments it depends on the motor design shut downs would be the time that air born materials would affect them. Check with the manufacture proper application wash down duty in wet areas hi temp duty ect. If they fit the application testing temp/humidity may only yield small...

Lots of good info here I have work on large slip ring motors for cranes. The bank of resistors helps the motor start smoothly. At the shop with out the resistor bank they start poorly and sometimes even cog where the shaft jogs clockwise then counter clockwish then take off. A gentle spin will...

This may sound like a step back from todays equipment. I would set it up with a meter that would show the readings of each R.T.D. Digital or analog does not matter.in the steel industry I have wittness analog meters that have saved motor or generator with this simple design some with alarms like...

THis is true about P.I. testing the equipment I use shows the fualts as the voltage rises and yes you could damage insulation. It reads micro amps for leakage setting this correctly will trip before it does any harm.

It really needs to have the conection pulled up and checked you could tell what the conection is be looking at the horse powers and speeds but lighting it is possible but I would not recomend it. You can determine the possbilities and test it on 1/3 voltage it would not damage it but it would be...

Field cases are very important As pete describe even cleaning the case such as sanding can change the motor power output.

P.I. Testing on voltages you wrote of from my experience may not give you a good reading. I do not know if this is proper to say this but I believe P.I. test on any voltage higher then 480 may not be the thing to do. Most of the systems I see in plants do not have the voltage output to correctly...

First thing is to ask the shop who wound it if they are core testing it. I have seen it large pumps where overburn cuase hot spots in the lamanations. I myself insulate every coil in a motor with wye delta start run. Just recently a 300 H.P. pump came in that I had wound 8 years prior. If your...

If the motor has A multi circuit connection you can just have them recconected for 440 volt. Most motor from over seas have multi circuit connection. I have reconected them or rewound them for the correct voltage.