Mechanical Services
Gearboxes, Pumps, Blowers & Fans, Extruders, Grinders, Choppers, Shredders, & More
On-Site Field Services
Certified Vibration Analysis, Laser Alignment, Dynamic Balancing, PDMA, Installations & More
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Another 1000HP ABB motor leaving our facility after a rush repair. Motor had a catastrophic bearing failure and required lots of machine work to restore everything back to EASA AR100 and OEM standards. The 575V stator winding was evaluated using the Electrom Instruments, Inc. iTIG IV. A new fan shroud was manufactured and a new external blower motor was installed. Rotor was balanced to ISO G1.0 and motor has been test ran and PdMA tested. Great job team!
#trustedpartner #motorrepair #acmotor #reliability #maintenance
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Finishing up another 2.3kV 400HP rewind with magnetic wedges here at EEMSCO, INC. We still have a few more 2.3kV rewinds in the queue. We truly appreciate our customers and more importantly our employees for their loyalty and trust for over the past 100+ years!
This rewind is rated for IEEE 522 3.5pu and ready for harsh environments with our epoxy resin VPI. Thank you to our partners at Precision Coil and Star Technology!
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It’s truly important to understand the importance of shaft voltage/bearing currents before trying to implement a solution. Sometimes, the best intentions will have less than a desirable outcome.
There is evidence of fluting on inner and outer races, electrical discharge on shaft, bearing ID & OD, housing and rolling elements in the pictures.
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Some cool pics of a motor winding job in process. Very intricate work handled beautifully by Jeff. A true work of art 🤌
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Due to the ice storm we will be keeping the offices closed on Monday January 6th. If you have an emergency please call your contact’s cell phone or email us. We will also have the after hours answering service on if you call the main number. Stay safe out there Tri-State!!
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Here is an interesting picture from our shop today. This motor was found to have a defect via vibration analysis. The vibration analysis indicated that there was a fault occurring from inside the machine. When disassembled one of the magnetic wedges had broken loose and was rubbing the rotor. This rewind was less than 2 years old, so what happened?
The magnetic wedge that was used was not correct for this 2300V, 400HP electric motor. The shape, length and metallurgical composition of the wedge didn’t match the factory specification. As a result, the wedges were able to vibrate in the slot allowing the wedges to deteriorate prematurely. There are other contributors as well, but ancillary contributors.
When you rewind an AC motor with form coils, a key component is making sure that the wedge shape, wedge material, wedge length and slot fill are correct for the machine for reliability purposes. Of course there are many other things to consider as well. As seen in the attached picture there are many variations of wedge shapes. We partner with our suppliers and OEMs to ensure that we are using the proper materials and/or finding ways to enhance the original design.
When you partner with EEMSCO, INC. you have a team at your disposal who can help ensure your assets have the proper materials to meet your application requirements and meet the ANSI/EASA AR100-2020 recommended practice for the repair of rotating electrical apparatus.
We’ve been around for over 100 years and look forward to serving our customers with excellence for years to come.
#reliability #ACmotors #rewind #EASA #EEMSCO #TrustedPartner #VibrationAnalysis
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