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Waross 1964 - T-Frames were introduced (same frame sizes today) 1954 - 1963 there were "U-Frame" - heavy duty, cool running, built like tank Pre 1954, just called Pre-U-Frame motors - frame sizes were different from each motor mfg. Mac

Gerrybhoy You are showing a 575V power motor (making it a 60HZ unit) - but your noted speeds of 3330 / 1250 RPM does not work for a 60HZ motor. What voltage & frequency are you applying?

ElectricPete Have you measure the skin temperature of purple picture strip heaters - using a thermal gun and compared it to one of the other 7 units? Depending on length of heater (500W) - skin temp can be up to around 200C Mac

Hello Muthu I'm in Canada and see many 575V applications. Your motor winding pictures that shows the motor frame - the motor frame look like a water cooled unit. I have had a number of customers using Siemens 575V VFD's that have killed motors- factory and EASA repaired units. Your client...

Shaft diameter & length is based upon the NEMA Frame size in question, 143T ~ 449T. There's no formula for shaft length. The only formula I am aware of is determining shaft height. Divide by 4 the first two digits of frame size. Mac

Muthu, Tmoose & Gr9blu thankyou for comments and questions. The motor is driving a VRU (Vapor Recovery Unit) Ring Compressor in a refinery. The refinery staff / team has large number of electrical, mechanical and reliability engineer. They know how to set up motor's alignment / magnetic...

Hello Pete Per client the coupling is a "flexible coupling". Yes the motor has BN prox. probes. Probes do not show any abnormal vibration, ever shaft movement. Client's comments: Motor #1 has total running hours around 15000, other two motor #2 & #3 have running hours around 19000. Below...

John; The motor shaft does have a magnetic center groove in shaft. I cannot say what the black line in the video is. Yes the magnetic center is known - and when uncoupled the motor shaft is in correct magnetic center position during no load operation. Mac

itsmoked: Yes only the motor shaft / coupling is moving - the compressor shaft/coupling is not moving. EdStainless: Yes, below the 660 RPM and slower, the shaft/coupling is not moving back and forth.

Good Day Have issue with a 1000HP, 10P (713 RPM) 4kv / 60HZ, TEAAC compressor motor - VFD powered - Variable torque application. Motor is direct coupled (flexible coupling) to VRU ring compressor and is VFD power from 660 - 740 RPM (fully loaded) The motor shaft starts hunting - movement...

Pete; A 1970 vintage Siemens Allis (Allis Chalmers) motor laminations, may not be a C5 core plate material, I am thinking it may have C3 core plate. Going from memory, C3 lamination material require a lower burn out temperature (around 500F), otherwise damage may occur to the organic...

Hi smrodriguez4 An Louis Allis 1375 HP, Armor Series - it will be more than 20+ years old. Louis Allis Milwaukee Co went of of business about 1998 or so, great products, high quality, rotor designs ahead of their time. I have some old catalogues in my paper files. As noted by ElectricPete...

smrodriguez4 There are number of factors why your 1375HP does not have any sleeve bearing insulation - age of motor, if over 10 years old, was not important at that time - if motor is operated from utility power, would not be required, unless your company has requirement in company...

Jimmy Can you advise details on the 150KW motor - IE frame size, speed, enclosure. Nameplate data would help. It appears the motor shaft is breaking in the pump impeller. Are the pumps/motor package integral with each other (flanged motor mounted onto pump) IE: what is called a...

Zeroseq - The motors are SCIM , induction motors. thanks for the comments. Even though SCIM are 3600RPM (low LRT, IE 60 to 70%), concern is if motors re-energize at a different phase angle, that the motor may go into breakdown torque (BDT of 200%) and cause some...

Does anyone have a good read on the subject of when we have a Main Bus A -Tie-Main Bus B system where one of the main “B” transformer failed and need to close my tie breaker to avoid all the motors shutdown on bus “B”. Is there a time cycle where I can catch motor before I will do damage to...

I remember seeing something similar many years ago, filter covers were used on TEFC motors used in the cloth manufacturing plants in North/South Carolina areas. Kept the flying threads,cloth dusts etc from plugging up the fan guard cover, cooling fan fouling etc.

MKMason Based upon your comments: You have a 500HP, 4kV induction motor driving a slurry pump. Going to assume motor is a 1780RPM (4pole mtr) to a gearbox and then to the pump. You want to drive the motor from the 50% to 125%. (885 to 2225 RPM) Typically slurry pumps (centrifugal type)...

Based on the bearing damage, the bearing was skidding in the raceway and then became jammed, causing the extensive damage /wear patterns on the rollers. I beleive there was some contamination / materials in the end-bracket's grease tube. Possible the repair shop did not clean the grease tube...

Bearing heaters are not installed in anti-friction bearings motors. The heaters are installed on self lubricated or forced lubricated sleeve bearing motors - called oil sump heaters. Typically around 10 to 20 watt immersion type heater in stalled in bottom of sleeve bearing bracket (oil sump)...