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Abstract. This paper presents the particle swarm optimization based equivalent circuit estimation (PSOBECE) method for three-phase induction motor efficiency analysis, during on-service condition. The prominent point of the paper is to accurately estimate the three-phase induction motor efficiency without disturbing motor operation, using basic electrical instruments, which are clamp-on power meter and non-contact tachometer. The proposed method estimates the parameters of induction motor equivalent circuit (EC) using motor current, real power, voltage, and speed, which can be measured without interrupting the motors operations. Afterward, the motor's efficiency can be nonintrusively determined from the EC. In this paper, the 1.5, 11 and 30 kW motors are used for test and verify the accuracy of the proposed method. The motor efficiency test results, by shaft torque method, compliance to IEC60034 standards, are used as references to verify the accuracy of the proposed method compared to the conventional slip and current methods. The proposed method resulted in the reasonable mismatch in efficiency estimation for three-phase induction motor. The root-mean square mismatch of the proposed method, comparing to those of obtained by CM and SM, is shown to be minimum. Therefore, the proposed method could effectively and conveniently be applied for the on-service three-phase induction motor efficiency estimations.

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