THE ONLY AVAILABLE LONG-TERM FIX FOR ELECTRICAL BEARING DAMAGE



SGS SHAFT GROUNDING SYSTEMS



Where Heavy Duty motors meet heavy duty shaft grouding



Can a thumb size shaft grounding device that runs directly on the shaft or a device that uses little bristles like what are found in printers prevent electrically induced bearing damage? Simple answer is, no. Those are not heavy duty devices that can run long-term while maintaining performance and reliability. At best, they will slow down electrical bearing damage for the short-term. Below you will see SGSTM devices that are so robustly built that they are intended to run at 1800rpm for 10 years prior to needing a quick brush change that is done on the fly. This claim is field tested and proven via actual 10-year long field studies. Continue below to see the SGSTM difference.



where to purchase?



DP&A Sales is the exclusive worldwide distributor of SGSTM products. See our contact page for further information. In addition, ABB and Toshiba are preferred OEM installers of SGSTM products. If you have a newly commissioned motor via these two OEM motor manufactures, then do not hesitate to request these motor manufacturers to install the only available long-term fix for electrical bearing damage SGSTM shaft grounding systems. Lastly, over the previous 30+ years, motor shops throughout the United States have worked directly with DP&A Sales so do not hesitate to request that they install SGSTM products onto your new or refurbished motors. SGSTM products are always readily available and most of our products are able to be shipped same day throughout the United States.



slideshow of our work


Testimonial From a Large NW University:


“We have 1000s of motors and VFDs on [our] campus and are constantly fighting the effects of motor bearing fluting and subsequent failures from stray shaft voltages. One of our buildings that was commissioned in 2005 contains approximately 20 pieces of original VFD driven motors equipped with the SGS CR series shaft ground[ing]. Since the commissioning in 2005 we have not had one bearing failure due to fluting. I believe this is a testament to the good design of the SGS CR shaft ground. Comparatively, in many of our newer buildings we have several types of shaft grounding, grounding/bonding straps, and electrical chokes installed on VFDs and motors that are claimed to inhibit bearing fluting. The reliability has been sporadic and in many instances poor with these compared to the SGS CR shaft ground[ing] in our 2005 building. This is a great example of a comparative long-term test of what works and what doesn’t.”

-Jarrett R.




CR Series for TEFC Motors


For TEFC motors between 5-300hp, 182T-449T and 3600rpm max. Axially driven on non-drive end. Field installable with handheld tools. Brush easily accessible while the motor is running. Field test and proven via actual long-term field studies to run continuously for 10 years prior to needing a quick brush change while eliminating electrical bearing damage for the entire wear life of the brush.


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cr series for odp/opsb/teao motors


For ODP/OPSB/TEAO motors between 5-300hp, 182T-449T and 3600rpm max. This system protects the bearing cavity. Axially driven on non-drive end. Field installable with handheld tools. Brush easily accessible while the motor is running. Field test and proven via actual long-term field studies to run continuously for 10 years prior to needing a quick brush change while eliminating electrical bearing damage for the entire wear life of the brush.


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SR SERIES SPLIT RING for drive end of motor


Exceptionally heavy duty, corrosion resistant field installable split ring shaft grounding system designed to be fitted without need for uncoupling equipment. Available in all standard NEMA shaft diameters as well as custom shaft diameters between 1-7/8" and 15 inches.


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SR SERIES COMPACT SPLIT RING FOR CLOSE COUPLED MOTORS


Heavy duty, corrosion resistant materials in compact form allows this split ring shaft grounding system to be field installed onto close coupled applications where vertical clearance from the top of the shaft is limited. Dual brush design affords long-term performance and is also maintainable a hallmark of all SGS shaft grounding devices.

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CL Series for 300hp to several 1000hp motors


The very large CL Series shaft grounding system for the non-drive end of large frame motors is designed to handle increased shaft-to-frame voltages and current that would cause havoc on lighter duty grounding devices. Its brush running surface is fully sealed and the grounding device is fully maintainable making it the only grounding system you'll ever buy for your motor.

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cm series for fractional horsepower motors


The CM Series has the same form factor as the CR Series, but is designed for smaller AC motors. Best suited for critical applications where downtime outweighs the cost of changing bearings or tossing the motor. The CM Series will eliminate electrical bearing damage for the long-term.

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cR series for vertical motors with curved bonnets


This custom CR Series is designed with special adapters for installing onto vertical motors with curved metal or plastic bonnets. Made to fit all standard NEMA and IEC motors.

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a3 series for TACHS AND ENCODERS


The A3 series kits are designed to mount on the outboard end of common pancake style industrial tachometers or motor accessory brackets with the 8.5 inch mounting register.

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RE3000 series for TACHS, Resolvers, ENCODERS


The patented RE3000 shaft grounding system is designed to mount onto 56 c-face applications such as resolvers or tachometers. In its standard form, it does not mount directly to the motor. If there is a need to mount this system directly onto the motor, then other custom systems are available. This system requires about 1 inch of axial clearance and the tachometer or resolver must be connected to the motor shaft with a conductive coupling.

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