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
Annual Salary Survey
After almost a decade of uncertainty, the confidence of plant floor managers is soaring. Even with a number of challenges and while implementing new technologies, there is a renewed sense of optimism among plant managers about their business and their future.
The respondents to the 2014 Plant Engineering Salary Survey come from throughout the U.S. and serve a variety of industries, but they are uniform in their optimism about manufacturing. This year’s survey found 79% consider manufacturing a secure career. That’s up from 75% in 2013 and significantly higher than the 63% figure when Plant Engineering first started asking that question a decade ago.