August 2020

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August 2020 (Complete Issue PDF)

Feature Articles

Solar Tracker System Helps Overcome Site Topography Challenges
RBI Solar relies on TB Wood's custom jaw couplings to provide long lasting performance in tough environments.

Voith SafeSet Couplings Prevent Catastrophic Failure
When City Scrap & Salvage experienced a catastrophic failure of the driveline between the motor and rotor of its automotive shredder, the company called on Voith Turbo for a potential manufacturing solution.

Engineering Showcase - Couplings
Special advertorial section featuring the latest technology in couplings from leading manufacturers.

Hannover Messe USA Goes Digital
There would have been an incredible lineup of products and technologies in Chicago in the Hannover Messe USA pavilion at IMTS 2020 -- everything from cobots and smart factory automation solutions to digital twins and mechanical power transmission components. Unfortunately, the planet had other ideas this year and we continue to conduct business on laptops, smartphones and Zoom meetings for the foreseeable future.

Centralized vs. Decentralized: Choosing the Right Type of Motor Control System
Are you looking for one simple formula to help you choose between centralized and decentralized motor control? Unfortunately, such a formula does not exist. However, evaluating the overall size of the system, comparing labor and material costs, and maintaining flexibility can help guide engineers in the right direction.

Technical Articles

Closing the Loop around a Transverse Flux Hybrid Step Motor
Transverse magnetic flux motors -- also known as step motors -- become Hybrid Servos when you operate them closed loop. This is the same transformation that happens between running a 3-phase synchronous motor from line voltage as opposed to running it closed loop as a brushless servo. In the case of hybrid motors, there are many degrees of what is advertised as "closed loop," and thus significant differences in the performance improvements seen.

Monitoring Concept Study for Aerospace Power Gearbox Drivetrain
Rolls-Royce is pioneering the UltraFan engine family architecture containing a planetary gearbox in a power range of 15 to 80 megawatts. To increase the efficiency of the UltraFan, a planetary gearbox is introduced between fan and intermediate pressure compressor. This enables running the turbine to rotate faster and allows a reduced fan speed.

FEM Analysis of the Load Distribution over the Face Width of Helical Gear Pairs Considering Deviations, Misalignments and Deformations
The load carrying capacity of spur gears may be calculated by ISO 6336 using influence factors. The face load factor considers the impact of the non-uniform load distribution over the face width. Even if the gears had perfect geometry, the load would not distribute uniformly along the contact lines. The face load factor depends on deformations of all parts of the containing gearbox and mainly of the teeth, gears and shafts as well as on manufacturing and assembly deviations.

Departments

The Show Must Go On...Somehow (Publishers Page)
Normally at this time of year we talk a lot about trade shows. We go to manufacturing and engineering events because that's where technology-oriented companies often unveil their innovations. Like many of you, we want to see that technology in person, talk to the experts who created it and better understand how it fits into the overall manufacturing and engineering landscape. One of our most important missions is learning about that information and sharing it with all of you.

Product News (Product News)
The latest product news from Miki Pulley, Voith, Firgelli Automations, Heidenhain, Zero-Max, Gates, KEB America, Siemens, H2W Technologies and Emerson Automation

Industry News (Industry News)
The complete Industry News section from the August 2020 issue of Power Transmission Engineering.

Electric Bikes - Wired for Fun (Power Play)
There is absolutely no doubt that riding an electric bicycle will not stir up cinematic memories of Marlon Brando (The Wild One) or Steve McQueen (The Great Escape) tearing it up on their hogs. Think more Pee Wee Herman and his Great Adventure.