Study on Electrical Pitting Prevention Device of a Rotating Shaft Using Automatic Control Potential Balancing.

Area of Science:

• Electrical Engineering
• Materials Science
• Mechanical Engineering

Background:

• Rotating machinery with shafts and bearings generates voltage and current, leading to potential differences.
• This potential difference causes electrical corrosion, resulting in motor failure, reduced bearing life, and safety hazards.
• Existing passive grounding devices are insufficient, leading to localized potential differences and brush-generated shaft currents.

Purpose of the Study:

• To develop an active electrical corrosion protection device for rotating power supply shafts.
• To eliminate potential differences on the rotating shaft using an external power supply and feedback system.
• To prolong motor life and improve the stability and efficiency of related equipment.

Main Methods:

• Developed an active protection device with current and potential difference detection and a feedback system.
• Utilized a rotating-shaft test rig to simulate potential differences and verify device performance.
• Optimized the design to accurately quantify and control potential differences within 2 mV.

Main Results:

• The developed device effectively eliminated potential differences on the rotating shaft.
• Achieved precise control of potential difference, maintaining it within 2 mV.
• Demonstrated excellent performance in reducing electrical corrosion over a 30-day trial on a merchant ship's rotating shaft.

Conclusions:

• The active electrical corrosion protection device significantly reduces potential differences and prevents electrical corrosion.
• The technology offers prolonged motor life, improved operational stability, efficiency, and safety.
• This innovative solution addresses a critical issue in rotating machinery maintenance and reliability.