Three Phase Induction Motor Loss Calculation

The provided assignment discusses the calculation of stator copper losses with respect to voltage, thermal testing at rated load, and variable load testing at rated conditions. It also mentions the importance of considering core losses in parameter identification of three-phase induction machines. The assignment highlights various references and studies on eddy current loss estimation in electrical machines, including 3D electromagnetic field and eddy current loss in turbogenerator end regions.

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ENGINEERING DESIGN ASSIGNMENT
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What is the paper all about?
The paper discusses about the core loss of induction motor and how important it is for
the businesses to measure the core loss as induction motors are one of the most electrical
energy consuming machines and they consume huge amount of power i.e approximately 69%
of total electricity consumed by industrial sector companies. The paper also informs about
various types of losses of induction motor and the process of no load testing by which core
loss is determined (Che, Hang Seng, et al). The three methods to execute the test for core loss
has also been discussed in the paper which are thermal test, no load test and variable load test
at rated conditions also has been discussed along with the(Drif, M'hamed, and Antonio J.
Marques Cardoso). The various methodology of core loss determination is also mentioned.
The paper also includes circuit diagram of no load test. The parameters of no load test are
also included (Zhou, Dehong, Jin Zhao, and Yang Liu). The formulae to calculate windage
losses and the graphs of input power and applied voltage have also been provided. The
principle aim of the paper is to calculate the loss characteristics of induction motor(Shi, Pu, et
al.). The paper mainly described the processes of measuring “Rational losses”( Huang,
Ziyuan, et al). Dependence over the no-load test and various parameters like no-load
resistance, impedance, reactance, and magnetizing current per phase and core-loss current on
each phase is derived in the paper (Chatterjee, Debashis). The graphs and practical
arrangements of the tests and finally the formulae which were applied also been discussed.
The graphs have been plotted based on the values obtained from the experiments. The values
of loss elements and its values are also derived in the paper from the calculations.
In what aspect, the paper enhance the understanding of the
Electrical Machines ?
The paper focuses on the core-loss of induction motors. It also specifies the
importance for the businesses to determine the core loss of the induction motors as it
consumes huge amount of electricity. The concept of core loss is important for understanding
of electrical machines. The iron loss or core loss consists of two kinds of losses that is eddy
current loss and hysteresis loss (Longbiao, Li). Eddy current loss occurs whenever there is a
relative motion between Conductor and Magnetic Field. Since, of the relative motion an
electromotive force (emf) is induced in the Conductor itself according to Faraday’s Law of
Electromagnetic induction. Since the material is a conducting material like iron, these EMFs

2ENGINEERING DESIGN ASSIGNMENT
circulates currents within the body of the Conductor (Dubas, Frederic, and Akbar Rahideh).
Eddy current is defined as “The resistive loss occurred in electrical machines that transform
some forms of energy, such as kinetic energy, into heat (Hamzehbahmani, Hamed, et al).
This Joule heating reduces efficiency of iron-core transformers and electric motors and other
devices that use changing magnetic fields.”These circulating currents are called Eddy
Currents. When these current flow into the core of induction motor they produce losses and
know as eddy current loss (Handgruber, Paul, et al). The paper helps to understand the
efficiency of electrical machines like three phase induction motors. The paper gives idea
about hysteresis loss as well, which is defined as “the loss when a part of electro magnetizing
force Hysteresis loss is due to the reversal of magnetization of transformer core whenever it
is subjected to alternating nature of magnetizing force .Whenever the core is subjected to an
alternating magnetic field, the domain present in the material will change their orientation
after every half cycle. The power consumed by the magnetic domains for changing the
orientation after every half cycle is called hysteresis loss”. Hysterisis loss is a permanent type
of loss(Steentjes, Simon, et al.). The paper enhances the understanding of eddy current loss
and how it is reduced using lamination of core of three phase induction motor and other
electrical machines (Wang, Likun, et al.). It also calculates and shows graph of windage loss
on no load test data. The loss elements i.e stator copper loss, loss due to rotation, friction and
windage loss(Kiyota, Kyohei, et al.), core loss with its value has been calculated in the paper
which gives idea about the efficiency of three phase induction motor(Mohammadi, Sajjad,
Mojtaba Mirsalim, and Sadegh Vaez-Zadeh).
Were there any future issues that the authors were concerned or
would address later ?
The loss characteristics of the induction motor though has been discussed but the test
can be done in future which will improve in better understanding of the loss characteristics of
an three phase induction motor. The test can be further performed in future to develop loss
information.
The stator copper loss is derived from the data obtained from current that is stator
rated and the winding of three-phase induction motor offers the total resistance. The three
types of losses that is, copper, and friction and winding loss can be determined after running
the power test as well as no load test. With no load the motor gets operated and rated voltage

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and frequency. The friction and winding loss can be calculated in future by plotting a graph
of the input power negative the stator copper loss with respect to the voltage and to further
elaborate the voltage to the value up to the volt power of zero. The paper has only focused on
discussion about no load method test but thermal test at rated load and variable load test at
rated conditions will be discussed in future. The total amount of loss can be further be
determined for three phase induction motor and other electrical machines after the two other
tests.

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References
.
Chatterjee, Debashis. "Impact of core losses on parameter identification of three-phase
induction machines." IET Power Electronics 7.12 (2014): 3126-3136.
Che, Hang Seng, et al. "Current control methods for an asymmetrical six-phase induction
motor drive." IEEE Transactions on Power Electronics 29.1 (2014): 407-417.
Drif, M'hamed, and Antonio J. Marques Cardoso. "Stator fault diagnostics in squirrel cage
three-phase induction motor drives using the instantaneous active and reactive power
signature analyses." IEEE Transactions on Industrial Informatics 10.2 (2014): 1348-1360.
Dubas, Frederic, and Akbar Rahideh. "Two-dimensional analytical permanent-magnet eddy-
current loss calculations in slotless PMSM equipped with surface-inset magnets." IEEE
Transactions on Magnetics 50.3 (2014): 54-73.
Hamzehbahmani, Hamed, et al. "Eddy current loss estimation of edge burr-affected magnetic
laminations based on equivalent electrical network—Part I: Fundamental concepts and FEM
modeling." IEEE Transactions on Power Delivery29.2 (2014): 642-650.
Handgruber, Paul, et al. "Three-dimensional eddy-current analysis in steel laminations of
electrical machines as a contribution for improved iron loss modeling." IEEE Transactions on
Industry Applications 49.5 (2013): 2044-2052.
Huang, Ziyuan, et al. "Loss calculation and thermal analysis of rotors supported by active
magnetic bearings for high-speed permanent-magnet electrical machines." IEEE Transactions
on Industrial Electronics 63.4 (2016): 2027-2035.
Kiyota, Kyohei, et al. "Cylindrical rotor design for acoustic noise and windage loss reduction
in switched reluctance motor for HEV applications." IEEE Transactions on Industry
Applications 52.1 (2016): 154-162.

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Longbiao, Li. "Assessment of the interfacial properties from fatigue hysteresis loss energy in
ceramic-matrix composites with different fiber preforms at room and elevated
temperatures." Materials Science and Engineering: A 613 (2014): 17-36.
Mohammadi, Sajjad, Mojtaba Mirsalim, and Sadegh Vaez-Zadeh. "Nonlinear modeling of
eddy-current couplers." IEEE Transactions on energy conversion 29.1 (2014): 224-231.
Shi, Pu, et al. "A new diagnosis of broken rotor bar fault extent in three phase squirrel cage
induction motor." Mechanical Systems and Signal Processing 42.1-2 (2014): 388-403.
Steentjes, Simon, et al. "Iron-loss model with consideration of minor loops applied to FE-
simulations of electrical machines." IEEE Transactions on Magnetics 49.7 (2013): 3945-
3948.
Wang, Likun, et al. "Influence of metal screen materials on 3-D electromagnetic field and
eddy current loss in the end region of turbogenerator." IEEE Transactions on Magnetics 49.2
(2013): 939-945.
Zhou, Dehong, Jin Zhao, and Yang Liu. "Predictive torque control scheme for three-phase
four-switch inverter-fed induction motor drives with DC-link voltages offset
suppression." IEEE Transactions on Power Electronics 30.6 (2015): 3309-3318.