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    Energy management program for use of induction motors based on efficiency prediction
    (2005-01-01)
    Phumiphak, T.
    ;
    Kedsoi, T.
    ;
    Chat-Uthai, C.
    Electric drive systems are currently responsible for the largest part of the electricity consumption. As the cost of energy increases, it is increasingly more important to remove the inefficient induction motors from operation. This paper proposes an energy management program that can help the plants to determine how much saving will be achieved by using more efficient motors. This paper focuses on the use of motor field efficiency estimation of motors without the removal of motor from service and without the output power measurement, and the use of motor efficiency prediction based on the manufacturer information. The motor efficiency evaluations are obtained from the equivalent circuit method. The test results indicate that this program is a tool of accurate economic analysis for the purchase scenario. As a result, it is possible to conduct on-site energy audits of existing motors in order to determine the potential savings and payback period with great confidence.
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    An economical method for induction motor field efficiency estimation for use in on-site energy audit and management
    (2004-12-01)
    Phumiphak, Thanaphiwat
    ;
    Chat-uthai, Chaiwut
    This paper proposes an economical method that can help the plants to make right decision in replacing the inefficient induction motors with more efficient ones. This method focuses on the field efficiency of motors without the needs for removing motors and measuring the output power. The use of a few sets of measured data from field test coupled with the genetic algorithms for evaluating motor equivalent circuit instead of using the no-load and blocked-rotor tests is proposed. To illustrate how well the estimated efficiency matches that of calculated obtained from the standard evaluations, the results of various induction motors rating up to 100 hp are presented. Test results indicate that this method has a high accuracy, then it is suitable for conducting on-site energy audits of motors in order to project cost savings and payback and to support a confidence decision regarding the investment in higher efficiency motors. © 2004 IEEE.