Energy

New motor designs to help save energy

The design of motors can help save a lot of energy and Fiji has the potential to be one of the first producers of certain types of motors. Professor Robert Lorenz of the University of Wisconsin-Madison, USA was the keynote speaker on day two of the 7th Symposium on Sensorless Control for Electrical Drives. The […]

USP

June 6, 2016 11:05 pm

The design of motors can help save a lot of energy and Fiji has the potential to be one of the first producers of certain types of motors.

Professor Robert Lorenz of the University of Wisconsin-Madison, United States of America, presents his keynote address.
Professor Robert Lorenz of the University of Wisconsin-Madison, United States of America, presents his keynote address.

Professor Robert Lorenz of the University of Wisconsin-Madison, USA was the keynote speaker on day two of the 7th Symposium on Sensorless Control for Electrical Drives.

The Symposium was organised by The University of the South Pacific’s (USP) School of Engineering and Physics and was held at the Sofitel Resort and Spa in Nadi.

Professor Lorenz, who is one of the pioneers of the development of self-sensing Motors, said that the goal of his presentation and participation in the Symposium is to get the participants to collaborate with each other.

“I am hoping that USP’s Head of School of Engineering and Physics (SEP), Professor Cirrincione would want to send some of his students from Fiji to work with me and come back and help grow the Engineering programme at the University,” he added.

One of the recommendations made by Professor Lorenz is that Fiji has the potential to be one of the first producers of certain types of motors, which would only be available here.

Professor Lorenz said that the principal way engineers could save energy was to change the way they design motors.

Classically the motors were designed to make old applications. As part of his presentations, Professor Lorenz demonstrated about the new applications, adding that these new motors are designed differently. With the newly designed motors, he said, one can achieve multiple goals simultaneously.

Over the past 15 years, the demands on new electric machine design have rapidly increased, providing many new opportunities to design motors for self-sensing.

SLED closing
Head of USP’s School of Engineering and Physics, Professor Maurizio Cirrincione (left) presents a certificate of participation to Dr Vrunda Amarendra Joshi from India.

To facilitate the design of motors for self-sensing, two items must be addressed, which are, the identification and dissemination of critical design parameters and methodologies, and standards of metrics for evaluating the models.

According to Professor Lorenz, there are three fundamental principles for Self-Sensing that all methods must follow. These three are:

  1. The motor must have a systematic spatial dependency, either inductive or resistive;
  2. Inverter excitation must enable the spatial dependency to be observed from standard feedback signals such as current or voltage, and
  3. Methods to track the saliency must meet motion state feedback control requirements of bandwidth, noise, and accuracy.

Final year Engineering student at USP, Dhirendran Kumar said that an interesting thing he noted from the presentation was that it focused on dynamical equations whereas past studies revolved around steady state motor equations.

“We got to learn a lot of new techniques in the Engineering field and specifically on Sensorless Control as I have a keen interest in this area,” he added.

Dhirendran further said that the Symposium was a timely one as it is related to his final year studies, in Bachelor of Electrical and Electronics Engineering and getting such exposure is a unique opportunity for Engineering students.

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