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Hello, There is interesting vibration phenomena during operation of the elctric motor of one of ours machines. During the first ~4 hours of operation the radial vibrations of the motor are increasing. At some point the vibrations are getting too high and we are stop the machine for couple of...

Now we are using for compressor (with the dimesion (mass and inertion) of the testing disk) 160[kWatt], 87[Hz], 400[V] motor. I'm not sure, but I'm thinking that the motor has independent cooling fan. ScottyUK - I can't use belt. Only direct driving. You wrote that I can use standard AC motor...

For the tests we are using steel disk in order to simulate centrifugal compressor mass and inertion, therefore there will not be load once the final speed (5000rpm) is reached.

Thank you, bgilbert. Your information was very helpfull. According to the torque and the speed as you calculated the motor minimal power has to be 52.4*524=27.5[kW]. Because there will not be any load during operation, I am thinking that standard AC 30-40[kW] motor will made the job.

Hello, May be somebody who has experience can point me generally what type of motor I need for my application. There are the requirements: vertical mounting rotor speed: 5000[rpm] rotor mass: 600[kg] rotor moment of inertion: 60[kg*m^2] acceleration time: 10-15[min] The motor is for testing...

Thanks to all replies. It's very helpfull to me. I'm checking now for the most suitable combination of material, coating and lubricant for the sleeve. And also I'm checking the suggestion of Tmoose about simulating gravity.

The design is new.The bearings are grease lubricated. The system is in vacuum, so oil lubricating is difficult mission.

I can't change the bearing. The system is vertical and the speed is high (6500rpm). So I have only spindle bearings. There are springs on the sleeve that give preload for the bearing. The sleeve is in close fit with the housing. That little axial movement of the sleeve is very important because...

There isn't used lube oil. The system is running in vacuum. Only grease can be used like lubricant. I also have been thinking of tin or lead or harder plating like chromium plating, but I has to use some material that wouldn't make damage to the housing, because the housing existing allready and...

I have attached a sketch of the application. This is not usual bearing. It is sleeve for roller bearing. The sleeve has to be able to move axially about 0.5 [mm] in order to compensate for the shaft thermal expansion during work. Without compansation of the shaft expansion, the bearings axial...

Hello, What is the recommended way to deal with fretting corrosion in plain bearing? Lubricant? Coating? The bearing and the housing are made of cast iron.