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Large hydraulic cylinders (LHCs) are integral components in the functioning
of large machines in mechanically demanding, corrosive and abrasive environments, such as offshore drilling rigs. The materials utilized in these largescale hydraulic systems must deliver reliable performance throughout their expected lifecycle.
Reliability and maintenance engineers can improve uptime and save money on both long-term maintenance and downtime costs by properly diagnosing and correcting bearing vibration issues when they exceed their acceptable limits. This requires inspecting the housing as well as the liner for wear, and replacing them as a pair when the housing is worn, so that wear-in between the mating surfaces can occur.
Three electric motor repair facilities share best practices for utilizing copper in motor repair, and recommending new
motors to replace older, less-efficient motors
The SKF Generalized Bearing Life Model is (GBLM) an innovative new bearing rating life model that is designed to help engineers calculate bearing rating life in a more realistic manner. The new model is a major step forward for the industry and will play an important role in enabling OEMs and end users to better match bearings and applications, resulting in improved machine life and reduced operating costs.
Design engineers across industries rely on pillow block bearings for a variety of tough and unconventional applications. Having access to data that backs housing strength performance claims is an integral part of choosing the right bearing to keep operations running optimally. What design considerations must be made when the application demands a pillow block installation on a non-horizontal
orientation? What happens when bearing load is not applied through the base of the unit? Timken answers these questions with physical testing, advanced modeling and real-world experience to facilitate the selection of pillow block bearings for specific applications.
This paper presents a joint project conducted by Ashwoods Electric Motors and Oerlikon Fairfield that uses planetary drives with an integrated electric motor. Current solutions used in production of off-highway vehicles rely upon large, heavy and inefficient brushed DC or induction motors, coupled to a planetary gearbox. This presents a number of challenges to the vehicle designers such as: limited vehicle range, limited space around the motor/drivetrain, and motor durability.
The proposed integrated system utilizes an Oerlikon Fairfield Torque Hub, widely used in off-highway vehicles, and the
Ashwoods first-to-market, interior permanent magnet motor. How these products are integrated, i.e. incorporating a brake solution, represents a market-changing product. Using interior permanent magnet (IPM) technology in the motor design means the motor can be up to 70% lighter, 70% smaller and 20% more efficient than traditional motors used in off-highway
traction applications.
Implementing a power-on-demand concept based on variable speed drives allows for energy saving in any application
that involves pumps or hydraulic systems. And when used in combination with an intelligent wiring and communication system, relevant machine data can also be easily recorded
- the basis for comprehensive power management.
Beginning with this initial installment , and with the gracious permission of ABB/Baldor Electric, we are
pleased to announce the beginning of a new series -- Baldor Basics: Motors. This is a collection of basicsdriven,
motor-intensive articles authored by former Baldor engineer Edward Cowern, PE, a respected
name by many in the electric motor industry. During his tenure at Baldor, Cowern - now enjoying his
retirement - was tasked with producing a number of motor- and basics-related tutorials, primarily in
response to a steady flow of customer questions regarding motors. Today's customers continue to ask
questions and seek answers to address their various motor-related issues. As with Cowern's original
introduction to the series, we hope you find these articles useful and would appreciate any comments or
thoughts you might have for future improvements, corrections or topics.