A Workbench for Quality Control of Induction Motor Stators

A. A. de Espindola, F. J. H. Kalluf, S. C. Lima, J. P. Schlegel, N. J. Batistela, P. Kuo-Peng, J. P.A. Bastos


This paper is related to the development of an experimental workbench for testing stator cores of fractional horsepower induction motors. The workbench is able to evaluate the quality of the stator core in terms of magnetic material, dimensions, as well as manufacturing faults as short-circuit on laminations. This new tester submits the sample to magnetic flux closer to a real machine compared to traditional testers. In spite of not allowing segregation of the losses components, this workbench compares relative magnetic losses among different electrical steels used in stators. In order to validate the workbench, tests are carried out using the same lamination with three different electrical steels having the same commercial grading. The results are compared to the traditional Epstein Frame, the Ring Coil Tester and the commonly used Dynamometer, which is a very effective process for evaluating the motor quality. The Core Tester proposed in this paper can be used without a total assembly of the machine and mechanical connection with the dynamometer itself. It can detect possible stator troubles during the manufacturing process. Samples with simulation of short circuit on steel sheets are also tested. Results show that the new tester is able to compare materials and indicate manufacturing faults.


Induction motors. Iron losses. Magnetic materials. Ron-destructive testing. Pulse width modulation inverters. Rotating machines. Test facilities.

Full Text:



Z. Gmyrek, A. Boglietti, A. Cabagnino, "Estimation of iron losses in induction motors: Calculation method, results and analysis``, IEEE Transactions on Industrial Electronics, Vol. 57, N. 1, January 2010.

J. V. Leite, M. V. F. da Luz, N. Sadowski, P. A. da Silva Jr., "Modelling dynamic losses under rotational magnetic flux``, IEEE Transactions on Magnetics, Vol. 48, N. 2, February 2012

A. A. de Espindola, J. P. Schlegel, A. de C. Antônio Jr, N. J. Batistela, N. Sadowski, J. P. A. Bastos, P. Kuo-Peng, F. J. H. Kalluf., "A Methodology for Quality Analysis on Stator Cores``, XX International Conference on Electrical Machines – ICEM, vol. 1, p. 1533 - 1537 , Marseille, France, September 2012.

C. Patsios, E. Tsampouris, M. Beniakar, P. Rovolis, A. G. Kladas " Dynamic finite element hysteresis model for iron loss calculation in non-oriented grain iron laminations under PWM excitation``, IEEE Transactions on Magnetics, Vol. 47, N. 5, May 2011.

P. Rasilo, E. Dlala, K. Fonteyn, J. Pippuri, A. Belahcen, A. Arkkio. "Model of laminated ferromagnetic cores for loss prediction in electrical machines``, IET Electr. Power Application, Vol.5, Iss. 7, pp. 580-588, 2011.

M. Ibrahim, P. Pillay. "Novel equipment for the measurement of core losses in laminations for advanced machines``, IEEE International Electric Machines & Drives Conference (IEMDC), 2011.

N. Takahashi, M. Morishita, D. Miyagi, M. Nakano, "Comparison of magnetic properties of magnetic materials at high temperature``, IEEE Transactions on Magnetics, Vol. 47, N. 10, October 2011.

D. L. Rodrigues-Jr, J. R. F. Silveira, G. J. L. Gerhardt, F. P. Missell, F. J. G. Landgraf, R. Machado, M. F. de Campos "Effect of plastic deformation on the excess loss of electrical steel``, IEEE Transactions on Magnetics, Vol. 48, N. 4, Abril, 2012.

Y. Zhang, N. Alatawneh, M. C. Cheng, P. Pillay, "Magnetic core losses measurement instrumentations and a dynamic hysteresis loss model``, IEEE Electrical Power & Energy Conference, 2009.

P. Marketos, S. Zurek, A. J. Moses, "A method for defining the mean path length of the Epstein frame``, IEEE Transactions on Magnetics, Vol. 43, N. 6, June 2007.

"Magnetic Materials – Methods of Measurement of the Magnetic Properties of Electrical Steel Sheet and Strip by Means of an Epstein Frame", IEC Standard 404-2, 1996-03.

P. Beckley, Electrical Steels for Rotating Machines – (IEE Power and Energy Series, No. 37). Glasgow, Bell & Bain Ltd., 2002.

A. G. Torres, R. Lyra, B. J. Cardoso Filho, M. A. Cunha, S. C. Paolinelli, "Determination of the Magnetic Losses in Induction Motors based on the Generalized Epstein Test", In: 39th IAS Annual Meeting, 2004, Seattle. Conference record of the 2004 IEEE Industry Application Conference.

J. P. Schlegel, N. J. Batistela, N. Sadowski, P. Kuo-Peng, J.P.A Bastos, M. Rigoni, A. A. de Espíndola, L.V.Dokonal, "Testing Strategies to Evaluate Non-Oriented Electrical Steels Losses``, Journal of Microwaves, Optoelectronics and Electromagnetic Applications, Vol. 11, No. 2, p 302 – 3013, December, 2012.

A. Boglietti, A. Cavagnino, L. Ferraris, M. Lazzari, "The annealing influence onto the magnetic and energetic properties in soft magnetic material after punching process``, Electric Machines and Drives Conference – IEMDC, vol.1, 503 - 508, July, 2003.

A. A. de Espíndola, F. Tristão, J.P. Schlegel, N.J. Batistela, N. Sadowski, P. Kuo-Peng, M. Rigoni, "Comparison of Iron Losses Evaluations by Different Testing Procedures``, XIX International Conference on Electrical Machines – ICEM 2010, vol. 1, p. 1- 4, September, 2010, Italy.

E. J. Meurer, N. J. Batistela, R. Carlson, N. Sadowski, L. V. Dokonal, A . A . de Espíndola., "Interlaminar Losses Evaluation in Electrical Machines Stators``, XVII International Conference on Electrical Machines – ICEM, vol. 1, p. 1 , Chania, Crete Island, Greece, September 2006.

T. L. Mthombeni, P. Pillay, R. M. W. Strnat, "New Epstein frame for lamination core loss measurements under high frequencies and high flux densities``, IEEE Transactions on Magnetics, Vol. 43, N. 6, June 2007.

M. Morimoto, "Induction motor made of iron powder core``, The 2010 International Power Electronics Conference, 21 - 24June, 2010, Japan.

D. Miyagi, D. Otome, M. Nakano, N. Takahashi, "Measurement of magnetic properties of nonoriented electrical steel sheet at liquid nitrogen temperature using Single Sheet Tester``, IEEE Transactions on Magnetics, Vol. 46, N. 2, February 2010.

Enokizono, M.; Suzuki, T.; Sievert, J. D., "Measurement of Iron Loss Using Rotational Magnetic Loss Measurement Apparatus``, IEEE Translation Journal on Magnetics in Japan, Volume: 6 , Issue: 6, p. 508 – 514, 1991.

R. Ramarotafika, A. Benabou, S. Clenet, J. C. Mipo, "Experimental Characterization of the iron losses variability in stators of electrical machines``, IEEE Transactions on Magnetics, Vol. 48, N. 4, Abril, 2012.

J.P. Schlegel, N. Sadowski, N.J. Batistela, B.A.T.Iamamura, J.P.A. Bastos, A .A. de Espíndola, "Core Tester Iron Losses Segregation by Finite Element Modeling``, IEEE Transactions on Magnetics, v. 48, p. 715-718, 2012..

N. J. Batistela, A. J. Perin, "A Fixed Frequency Sliding Mode Control for Voltage Source Inverter``. In: III Brazilian Power Electronics - COBEP'95, São Paulo, p. 229-234, 1995.

Batistela, N. J., LUZ, M. V. F., Sadowski, N., Carlson, R., Bastos, J. P. A., Silva, C. A., "An experimental workbench to iron losses and magnetic characterization to be applied in the FEM``. In: 9th International IGTE Symposium on Numerical Field Calculation in Electrical Engineering, p.121-125, September, 2000, Graz.

S. L. Jung; Y. Y. Tzou, "Discrete sliding-mode control of a PWM inverter for sinusoidal output waveform synthesis with optimal sliding curve``, IEEE Transactions on Power Electronics, Volume: 11 , Issue: 4, p. 567 – 577, 1996.


  • There are currently no refbacks.

© Copyright 2007-2016 JMOe Brazilian Microwave and Optoelectronics Society (SBMO) and Brazilian Society of Electromagnetism (SBMag)