separation of losses in a 3 phase induction motor

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How the efficiency of induction motor is measured?
S. Corino E. Romero L.F. Mantilla
Department of Electrical Engineering and Energy
E.T.S.I.I. y T. Universidad de Cantabria
Avda de Los Castros, 39005 Santander (Spain) phone:+34 942 201381, fax:+34 942 201381, e-mail: mantillf@unican.es

Abstract
The efficiency is of paramount importance nowadays due to increasing electrical energy demand, increasing awareness of environmental problems as greenhouse effects and increasing fossil fuel prices.
This paper tries to show the different results between the standards for efficiency evaluation and the necessity of harmonization worldwide. Then, it is going to be explained the different standards for measurement of efficiency, and the main differences between the standards (IEEE 112, IEC 60034-2 and
JEC-37).
To complete this study, it is going to be described the steps in order to estimate efficiency on the jobsite and expressed the different efficiency labels motors.

Keywords: energy efficiency, induction motor, standard.
Code: 352-mantilla

There are different efficiency definitions that describe the relationship between a motor’s rating and efficiency test results:
Tested. This refers to the efficiency measured by testing that specific motor.
Nominal or Average Expected.
Nominal
values are the average values obtained after testing a sample population of the motor model. Nameplate. This refers to the efficiency measured by a specific standard.
Minimum. These values are intended to represent the lowest point in the bell curve of motor efficiency distribution.
Apparent Efficiency. This is the product of a motor’s efficiency and power factor.

1. Introduction
The efficiency is of paramount importance nowadays because electrical motors are major consumers of electricity in the modern industrial society; they consume approximately 69% of electricity in the industrial and approximately 36% in the tertiary sectors of the European

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