June 2020

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June 2020 (Complete Issue PDF)

Feature Articles

A Little Peace of Mind
Condition Monitoring Technology Evolves for Gear Drives, Gearmotors and Gearboxes. Here's a look at what some leading manufacturers are offering.

Upgrading Air-Cooled Heat Exchangers (ACHE) and Cooling Towers
Many industrial facilities with air-cooled heat exchangers (ACHE) and cooling towers often have older units installed. Depending on the age, repairs, and maintenance done over the years it may have had an impact on performance. Upon conducting site inspections of the equipment, it is sometimes found that ACHE or cooling tower components have degraded. This can result in a system that is not very energy-efficient and delivers substandard cooling performance.

Engineering Showcase - Motors
This special advertising section features Motors manufacturers.

The Transparency Initiative
Bosch Rexroth's Factory of the Future Aims to Improve Production Processes One Application at a Time.

Technical Articles

Dynamic Behavior of Planetary Gears
In planetary gear systems of high power density and high gear ratio, helical gears create undesirable tilting moments on the planet gears; therefore, spur gears are still preferred for planetary gears -- a special challenge with respect to noise. Specifically, the different behavior of planetary gears with sequential and symmetric gear mesh is explained in this paper.

Combining Gear Design with Manufacturing Process Decisions
The integration of manufacturing information into gear design software reduces cost during the design process by avoiding time-consuming back and forth between the design and manufacturing departments. The challenging task for such software is ensuring the design engineer does not need specific manufacturing expertise. Otherwise he or she would be overwhelmed and not use such a feature.

Transverse Magnet Flux AKA Hybrid Step Motor Driver Techniques
The transverse flux permanent magnet motor -- also known as a hybrid step motor or hybrid servo motor -- has a wide range of performances, depending upon how you drive these motors, and whether you operate them in open loop or one of the many variants of closed loop methods you use. In this third installment we will cover some of the many ways to drive these motors, as well as how these choices affect the performance of these motors.

Departments

The Long Road to Recovery (Publishers Page)
I've been reading, watching and listening to a lot of pundits lately -- economic experts, industry experts, stock market experts, you name it -- trying to get some idea of what to expect next. Heh.

Precision Manufacturing and the Digitalization of Linear Motion Technology (Voices)
Digitalization is increasingly transforming mechanical engineering and manufacturing technologies, bringing with it not only unparalleled control and flexibility over production systems but so much more.

Product News (Product News)
The complete Product News section from the June 2020 issue of Power Transmission Engineering.

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

3x3 Puzzle Cubes with Gears (Power Play)
Looking at a Gear Cube XXL, you can't help but think about a Rubik's Cube. Both are 3x3 puzzle cubes with brightly colored pieces. Moreover, both are sold commercially as toys.