Featured Research

from universities, journals, and other organizations

Improving performance of electric induction motors

Date:
January 25, 2012
Source:
Elhuyar Fundazioa
Summary:
New research describes advanced motor control devices. These control devices are units designed to correct errors and improve the performance of the motors. This researcher has opted for cutting-edge models and has developed them so that they can be applied to an induction motor, and in this way he has transferred them from theory to practice.

The School of Engineers in Eibar (UPV/EHU-University of the Basque Country) was where Patxi Alkorta, a local professor, defended his thesis, following his research into advanced motor control devices. These control devices are units designed to correct errors and improve the performance of the motors. This researcher has opted for cutting-edge models and has developed them so that they can be applied to an induction motor, and in this way he has transferred them from theory to practice.

To do this, he made use of an experimental platform located at the school in Eibar. "These control devices have been used before, but I have adapted them for use in an induction motor, and I have shown that they are in fact applicable and suitable," says Alkorta. His thesis is entitled Desarrollo e implementación de controladores avanzados para motores eléctricos (Development and implementation of advanced control devices for electric motors).

The asynchronous (or induction) three-phase is the type of motor most widely used in industry. "Most of the electrical power consumed worldwide is in fact used by asynchronous motors," explains Alkorta. So it is essential to optimize the way they operate so that, among other things, they consume the lowest amount of energy possible and savings are made in power costs. Control devices are a great help in this task.

Speed and position

Alkorta has focused on advanced control devices that specifically help to adjust speed and position. Firstly, as each motor has been produced to operate at a specific speed, there have to be guarantees that this will be maintained, irrespective of any alterations (oxidation, friction, etc.) that can be caused by time. Secondly, it is a similar story with regard to position. For example, if a motor is required to turn 30 degrees, apparently it should not be too much to require that it should remain firm in the new position once it has made the turn, but in practice there are pitfalls; like for instance the load on the axis. As Alkorta explains, "the task of the control device is to mitigate the impact of that load. The better the control device is, the less that load impact will be noticed."

To correct the problems of speed and position, this researcher has developed and validated several advanced control devices on the basis of the proposals of a number of authors and by making adaptations in order to apply them to induction motors. "I have adjusted them and I have come up with three versions in each case, including some changes. I have done some experimenting and I have seen that they are in fact valid," he points out.

Specifically, he has worked with two types of advanced control devices: Sliding Mode Variable Structure Control Devices, and Generalized Predictive Control Devices. With those of the first type it is possible to mitigate those changes that the motor undergoes as a result of time, and which are unpredictable (inertia, friction, etc.); and with those of the second type, the performance changes that need to be demanded of the motor in the future are determined in advance. In other words, the control device of the first type enables us to know, for example, that the motor will require more revolutions in the future to maintain the same degree of operation; and in the second type the machine can be gradually prepared in advance to make these adaptations.

At the same time, Alkorta has experimentally validated the versions developed on the basis of these models, which has constituted the main contribution of his thesis. For this work, he used the experimental platform at the School of Engineers in Eibar. It goes by the name of Ei-IM-1 and is based on a 7.5 kW commercial induction motor. It was in fact started by Alkorta and some of his colleagues four or five years ago so that tests of this type could be carried out. It has enabled this researcher to verify that these advanced control devices developed to monitor speed and position can be used in real industrial applications.


Story Source:

The above story is based on materials provided by Elhuyar Fundazioa. Note: Materials may be edited for content and length.


Cite This Page:

Elhuyar Fundazioa. "Improving performance of electric induction motors." ScienceDaily. ScienceDaily, 25 January 2012. <www.sciencedaily.com/releases/2012/01/120112112645.htm>.
Elhuyar Fundazioa. (2012, January 25). Improving performance of electric induction motors. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2012/01/120112112645.htm
Elhuyar Fundazioa. "Improving performance of electric induction motors." ScienceDaily. www.sciencedaily.com/releases/2012/01/120112112645.htm (accessed July 31, 2014).

Share This




More Matter & Energy News

Thursday, July 31, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Britain Testing Driverless Cars on Roadways

Britain Testing Driverless Cars on Roadways

AP (July 30, 2014) — British officials said on Wednesday that driverless cars will be tested on roads in as many as three cities in a trial program set to begin in January. Officials said the tests will last up to three years. (July 30) Video provided by AP
Powered by NewsLook.com
Amid Drought, UCLA Sees Only Water

Amid Drought, UCLA Sees Only Water

AP (July 30, 2014) — A ruptured 93-year-old water main left the UCLA campus awash in 8 million gallons of water in the middle of California's worst drought in decades. (July 30) Video provided by AP
Powered by NewsLook.com
Smartphone Powered Paper Plane Debuts at Airshow

Smartphone Powered Paper Plane Debuts at Airshow

AP (July 30, 2014) — Smartphone powered paper airplane that was popular on crowdfunding website KickStarter makes its debut at Wisconsin airshow (July 30) Video provided by AP
Powered by NewsLook.com
U.K. To Allow Driverless Cars On Public Roads

U.K. To Allow Driverless Cars On Public Roads

Newsy (July 30, 2014) — Driverless cars could soon become a staple on U.K. city streets, as they're set to be introduced to a few cities in 2015. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



      Save/Print:
      Share:  

      Free Subscriptions


      Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

      Get Social & Mobile


      Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

      Have Feedback?


      Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
      Mobile iPhone Android Web
      Follow Facebook Twitter Google+
      Subscribe RSS Feeds Email Newsletters
      Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins