Feedback: Advanced motor designs, gain scheduling
Readers provide feedback on Control Engineering articles on advance motor designs and on gain scheduling. See links, comments, below.
Articles on advanced motor technologies and on gain scheduling drew reader feedback recently. See comments and links to articles, below.
FEEDBACK: Gain scheduling
Concerning your article titled “How gain scheduling works” on page 56 of the January 2011 edition of Control Engineering, I have a suggestion.
Instead of implementing gains scheduling, why not linearize the process feedback to units of volume? If you use the water level to calculate the current volume of water in the tank, the need for gains scheduling goes away. While the gains of the PID are no longer scheduled, the effective gain of the system still changes – so the engineer would have to be careful to tune his PID so that it was still stable in the region where the ratio of tank level to volume was the highest (in this case, the mid-point of the tank). However I would argue that the overall system will be easier to tune, take less time to tune, and be simpler. Plus it allows you to determine the percentage of the tank’s capacity, which will likely be more useful to the operator or controls software than percent of non-linear level.
John Blystone, Instrumentation & Controls Department Supervisor
Louis Perry & Associates Inc.
FEEDBACK: New motor technologies
Great article from Dan Jones on new motor technology. Great to get this by email. [This article was included in the Feb. 10 Control Engineering Machine Control monthly eNewsletter. Others may subscribe to eNewsletters at www.controleng.com/subscribe; browse other motor developments at www.controleng.com/new-products/motors-and-drives.html.]
The article cuts across many industries and should be followed up with some details on the individual companies that were cited. [See additional links added below.] I think there is a lot of interest because motors are so widely used and so poorly understood. The connection to the electric car is also a popular theme.
Thanks for a great job.
Steve Meyer, CEO/Senior Consultant
Solid Tech Inc.
- Events & Awards
- Magazine Archives
- Oil & Gas Engineering
- Salary Survey
- Digital Reports
- Survey Prize Winners
Annual Salary Survey
Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.
There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.
But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.
Read more: 2015 Salary Survey