What are shaft currents and how to protect my AC motor
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- เผยแพร่เมื่อ 18 พ.ค. 2022
- Over time, continual arcing within a motor will cause damage to the surface of the bearing raceway resulting in vibration and heat, loud operating noises, and eventually motor failure. Fortunately, there are several practical and easy ways to mitigate shaft current issues. Using proper VFD cables and bearing protection will help protect the life of your motor and driven equipment. Brush protection rings and insulated bearings are just a few ways to mitigate bearing currents that can harm the motor and equipment. Including these preventive measures will ensure peace of mind and increase the reliability of your inverter duty motor performance.
Contact your local ABB representative for more information related to motor bearing protection: bit.ly/3qZgt9N
Learn more about Baldor-Reliance motors for the HVAC industry: bit.ly/3rbKHaf - วิทยาศาสตร์และเทคโนโลยี
Contact your local ABB representative for more information related to motor bearing protection: bit.ly/3qZgt9N
Learn more about Baldor-Reliance motors for the HVAC industry: bit.ly/3rbKHaf
Really some great engineering of electric motors to last and fix a common problem of wear to the motor by induced rotor bearing discharge to ground...
Wow excellent great technology thanks sir.
Interesting. Thank you to share the experience and the video. Just great.
Glad you enjoyed it!
4:58
Using a single motor with a well-engineered mechanical system will certainly reduce complex electronics issues and reduce power consumption.
Nice motar wanting
Good choice
Can I use both ceramic bearings (NDE) and DE grounding on a motor that is running a belt driven load?
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A third option is the use of nano crystalline EMF cores which burn common mode current before it gets to your motor thus protecting motor insulation. Grounding rings and insulated bearings don't offer this protection. More than 99% of common mode current can cheaply be eliminated by these cores. 3Phi Reliability are bearing fluting specialist's.
Conductive grease in the bearings !
The first step in protecting the bearings would be to stop making motors with the cable entry plate painted and isolated with a rubber gasked from the motor chassis.
Are you referring to ground the cable glands, cable and plate together with motor?
@@MrICE003 Yes! You need to provide a return path through the cable shield to the high frequency currents that appear due to parasitic capacitances in the motor.
@@norberthani If this total cable>gland>plate>motor grounding has been achieved, do I still need:
1) both shaft grounding with one side insulated/ceramic bearing,
2) either grounding or insulated/ceramic bearing
3) none
@@MrICE003 If this shield continuity is achieved, then you don't need additional measures. However, for motors bigger than, let's say, 90 kW, isolated non-drive end bearing is recommended to avoid circulating currents.
Lots of complexity, conversion, consumption, coding and electronics !!!!