Extending Motor Life With Sustainable Shaft Grounding

Willwerth, Adam
May 2010
Heating/Piping/Air Conditioning Engineering;May2010, Vol. 82 Issue 5, p38
The article discusses the significance of shaft grounding as a cost effective approach to achieve sustainability of variable-frequency driver (VFD)-controlled motors. It explores the impact of VFDs on motor failure, especially the damages in the windings and bearings. It highlights the process of bearing insulation at one end for larger motors, and the process of insulating both bearings with high-impedance insulation for smaller motors.


Related Articles

  • Shielding bearings: Grounding helps inverter-duty motors live up to their name. Willwerth, Adam // Motion System Design Exclusive Insight;8/1/2012, p15 

    The article highlights the importance of grounding for inverter-duty motors. According to the author, inverter-duty motors without adequate bearing protection is misleading there is the potential for premature bearing and motor failure caused by electrical discharge machining. While...

  • Motor shaft grounding can enhance reliability in your inverter-fed motor. Steen, David E. // Control Engineering;Oct2013, Vol. 60 Issue 10, pM8 

    The article discusses the benefits of motor shaft grounding in improving reliability in an inverter-fed motor. Premature bearing failure can be caused by contamination, heat, incorrect loading or common mode voltage. Using variable frequency drives (VFDs) to drive motors helps in speed control...

  • A preventive plan for bearing protection. Willwerth, Adam // Plant Engineering;Jun2013, Vol. 67 Issue 5, p49 

    The article discusses best practices to protect bearing. It notes that cutting and careful inspection of the bearings of motors needing repair can offer information that can prevent the recurrence of electrical damage. It suggests installing a shaft grounding ring to protect replacement bearings...

  • Tip of the Week: Bearing Failure Prevention. Lamendola, Mark // Electrical Construction & Maintenance Exclusive Insight;11/30/2015, p1 

    The article offers suggestions on prevention of bearing failure which include remove motor grounding to eliminate flowing of current through bearings, good bonding will reduce current through bearings and conduct thermographic scans to identify high-impedance connections.

  • Single Wire Electrical System. Bank, Michael // Engineering;Nov2012, Vol. 4 Issue 11, p713 

    The purpose of this article is to remind of the past and present problems of creating single wire electrical systems. This article presents a new one wire electrical transmission system named B-Line which uses one line only and does not use ground as a second line. The proposed method is to work...

  • Stay Well-Grounded. Titus, Jon // Design News;10/9/2006, Vol. 61 Issue 14, p38 

    The article presents information for setting up a ground system for electric fittings. An earth ground, which is different from a current-return path, provides a path for current to flow to ground. Sometimes, equipment manufacturers employ return and earth ground for the establishment of an O-V...

  • Divergence Law of Ground Current about DC Transmission System. Zhi-Chao REN; Guang-Ning Wu // Applied Mechanics & Materials;2014, Issue 672-674, p1123 

    The calculation formula for divergence of DC grounding current was put forward. The divergence of DC grounding current at different directions in the earth was studied. The main factors include the pattern of electrode, distance between sending end area and receiving end area, earth structure,...

  • Ground Clamp Adaptor Combines Safety and Ease of Installation. Maxwell, Rich // Transmission & Distribution World;Aug2005, Vol. 57 Issue 8, p66C 

    Focuses on a ground clamp adaptor devised by Denton Jackson, an Entergy lineman who has spent 20 years in the electric utility field. Areas of application; Safety benefits offered by the device to linemen; Materials used in devising the adaptor; Other features of the equipment.

  • Study on 110kV Composite Material Transmission Poles and Towers. Yan QIN; Yanhai WANG; Long HAI; Yufeng LI; Yao FENG // Advanced Materials Research;2014, Vol. 986-987, p967 

    Traditional transmission line poles and towers have many problems, such as higher corrosion, heavy weight, poor durability and maintenance cost is high. Use of fiber reinforced polymer composites (FRP), based on the theory of poles and towers design, 110 kV FRP pole structure size parameters are...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics