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.

02/16/2011


Articles on advanced motor technologies and on gain scheduling drew reader feedback recently. See comments and links to articles, below.

FEEDBACK: Gain scheduling

Gain scheduling tutorial, Control Engineering Back to BasicsConcerning 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.
www.louisperry.com

FEEDBACK: New motor technologies

South Korea’s Electric Research Institute (KERI) has been building various transverse flux motors for more than 10 years.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.

www.solidtechinc.com



No comments
Consulting-Specifying Engineer's Product of the Year (POY) contest is the premier award for new products in the HVAC, fire, electrical, and...
Consulting-Specifying Engineer magazine is dedicated to encouraging and recognizing the most talented young individuals...
The MEP Giants program lists the top mechanical, electrical, plumbing, and fire protection engineering firms in the United States.
Water use efficiency: Diminishing water quality, escalating costs; Lowering building energy use; Power for fire pumps
Building envelope and integration; Manufacturing industrial Q&A; NFPA 99; Testing fire systems
Labs and research facilities: Q&A with the experts; Water heating systems; Smart building integration; 40 Under 40 winners
Maintaining low data center PUE; Using eco mode in UPS systems; Commissioning electrical and power systems; Exploring dc power distribution alternatives
Protecting standby generators for mission critical facilities; Selecting energy-efficient transformers; Integrating power monitoring systems; Mitigating harmonics in electrical systems
Commissioning electrical systems in mission critical facilities; Anticipating the Smart Grid; Mitigating arc flash hazards in medium-voltage switchgear; Comparing generator sizing software
As brand protection manager for Eaton’s Electrical Sector, Tom Grace oversees counterfeit awareness...
Amara Rozgus is chief editor and content manager of Consulting-Specifier Engineer magazine.
IEEE power industry experts bring their combined experience in the electrical power industry...
Michael Heinsdorf, P.E., LEED AP, CDT is an Engineering Specification Writer at ARCOM MasterSpec.