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Low-intrusive approach for parameters estimation of induction motor using adaptive optimal design algorithm based on on-site measurements
(2013-01-01)
Chat-Uthai, C.
;
Phumiphak, P.
This paper presents a novel low-intrusive method for estimating the equivalent circuit parameters of induction motor which focuses on a simple means without expensive testing. This paper describes the use of on-site measurements data incorporated with the adaptive optimal design algorithm based on optimization process in order to estimate the best possible set of motor parameters for determining the mechanical output at each measured load. This algorithm includes the feasible boundary of design variables process for evaluating the suitable boundaries of motor parameters depending on its power rating. This proposed method has been verified by the experimental results from four low-voltage TEFC induction motors rated at 2. 2, 4. 0, 5. 5 and 7. 5 kW. The results indicate that the agreement between the estimated parameters and the calculated parameters obtained from the standard equivalent circuit method validates the proposed method over a wide range of load conditions. For comparison, the results of estimated mechanical output of actual motors are illustrated. Therefore, this simple procedure can provide the useful information for selecting the motor most suitable for its application. © 2013 Praise Worthy Prize S.r.l.-All rights reserved.
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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.
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Estimation of short circuit current due to a group of induction motors using an aggregation model
(2004-12-01)
Suwanwej, Wanlop
;
Kunakorn, Anantawat
This paper presents generalized equations for determining an aggregation model to represent a group of induction motors connected in the same bus of industrial power systems. The model is employed in calculating short circuit current contribution with different types of faults from the group of induction motors. The simulation and analysis are performed using PSCAD/EMTDC. Various case studies are used to implement the model. It is found that the aggregation model proposed in the paper can give reasonable and satisfactory results for short circuit contribution due to the induction motor loads. © 2004 IEEE.
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Characteristics evaluation of 3 phase induction motors based on an acceleration method with increasing moment of inertia technique
(2003-01-01)
Warachart, Sae Kok
;
Lumyong, P.
There are many methods to evaluate a current-speed and torque-speed characteristic of induction motor such as measured output, acceleration, input, and direct measurement, as shown in IEEE standard 112-1996. In this paper, an acceleration method is proposed as a base method to evaluate the characteristics. By using such method, an increasing moment of inertia technique is used to increase an accelerating time. The calculation of the added moment of inertia for testing is presented. The retardation test method is also used to identify the rotor moment of inertia and the viscous friction coefficient of the test system. Mathematical methodology; RMS calculation and curve fitting technique are used to convert and smooth the data before calculation and analysis. The 1-hp, 3-hp, and 5-hp three-phase induction motor are investigated. The difference of the result between acceleration methods and equivalent circuit calculation is illustrated. Finally, the results from the acceleration test are compared with the test results from loaded test and locked rotor test.
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A study of starting current due to a group of induction motors using an aggregation model
(2003-01-01)
Piromthum, P.
;
Kunakom, A.
This paper presents a generalized aggregation model for representing a group of induction motors. The mathematical equations and computer models are detailed. The model, then, is used to predict the starting current from. The group of induction motors. Tests are performed on various sizes of induction motors so that the model can be verified. Results, obtained from measurements, are compared with those from simulations. It is found that the proposed aggregation model is able to give satisfactory results for determining the starting current from the group of induction motors.
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Multilevel regular-based binary multiplier for SPIM speed control
(2003-01-01)
Tipsuwamporn, V.
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Sompracha, C.
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Piyarat, W.
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Charean, A.
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Sawaengsinkasikit, W.
This paper presents multilevel regular-based binary multiplier switching method and parallel-full bridge inverter circuit for controlling speed of single-phase induction motor (SPIM). By constructing various types of 8 bit regular-based binary multiplier signal (RBM) modulated by single-phase multilevel signal, and then generating inverter output signal. This technique can improve the inverter output signal's performance, which demonstrates in term of reduction of total harmonic distortion (THD) and lower-order harmonic when applying to control the motor, resulting to improve the motor efficiency and performance.
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Adjustable energy control with ICBRM technique
(2002-01-01)
Tipsuwanporn, V.
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Suesut, T.
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Thepsatorn, P.
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Piyarat, W.
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Sawaengsinkasikit, W.
This paper presents a control method for single-phase and three-phase AC voltage supply by mean of ICBRM variable energy control technique which provides suitable power supply feeding to load requirements, and also, improve the feeding efficiency resulting in increased energy saving. The Integral Cycle Binary Rate Modulation (ICBRM) signals are integral cycle compositions of 8-bit binary rate multiplier (BRM) and 50 Hz, three-phase AC voltage signals which are divided into 8 parts per cycle, so that 2040 patterns are provided for the single-phase and three-phase feeding applications. Experimental results shows that such methods can be properly implemented for lighting bulbs and three-phase induction motor with low energy loss. This mean that the technique provides high efficiency performance and conducts energy saving.
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Design and analysis of delta modulated PWM inverter with regulated output voltage for 1-φ induction motor drives
(2000-01-01)
Sae-Sue, S.
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Kinnares, V.
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Sirichanpong, K.
;
Kleebbua, K.
This paper proposes the analysis and design of a delta modulated PWM voltage source inverter having feedback output voltage for 1-φ induction motor drives. This technique offers good advantages over a conventional delta modulated PWM technique in terms of remaining output voltage fairly constant under variations in load conditions and reducing capacitor value of a dc link filter. DC link ripple is inevitable, especially for finite LC or C filters at heavy load conditions. Consequently, output voltage is reduced thus, decreasing fundamental flux level in induction motors. The proposed technique can overcome such problems. The practical performance evaluation has been made over a wide range of operating conditions.

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