INDUCTION MACHINES ANALYSIS USING LABVIEW SOFTWARE PACKAGE _Ijmet 10 04_085

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International Journal of Mechanical Engineering and Technology (IJMET)
Volume 10, Issue 04, April 2019, pp. 856-868. Article ID: IJMET_10_04_085
Available online at http://www.iaeme.com/ijmet/issues.asp?JType=IJMET&VType=10&IType=4
ISSN Print: 0976-6340 and ISSN Online: 0976-6359
© IAEME Publication Scopus Indexed
INDUCTION MACHINES ANALYSIS USING
LABVIEW SOFTWARE PACKAGE
Isaac Samuel, Adesanya Ayokunle, Adesina Akinmeji, Adenugba Favour, Adebola
Soyemi and Osunlana Ismail.
Department of Electrical and Information Engineering,
Covenant University, Sango-Ota, Ogun State, Nigeria.
ABSTRACT
Induction machines are widely used in many industries due to their robustness,
ruggedness and easy maintenance feature. Due to the addition of power electronics
devices and the complexity involved in the design of induction machines, their study and
analysis can be very difficult. The use of software packages has been widely adopted to
analyze and study the behaviours of induction machines. This work focused on the use
of an engineering software package known as Laboratory Virtual Instrument
Engineering Workbench (LabVIEW). It is used in this work to study the behaviour and
characteristics of induction machines. LabVIEW was utilized due to its cheap and user-
friendly feature. This work shows that induction machines can be completely analyzed
using related mathematical equations for performance analysis.
Keywords: Induction Machines, LabVIEW and Simulations.
Cite this Article Isaac Samuel, Adesanya Ayokunle, Adesina Akinmeji, Adenugba
Favour, Adebola Soyemi and Osunlana Ismail, Induction Machines Analysis Using
Labview Software Package, International Journal of Mechanical Engineering and
Technology, 10(4), 2019, pp. 856-868.
http://www.iaeme.com/IJMET/issues.asp?JType=IJMET&VType=10&IType=4
1. INTRODUCTION
LabVIEW is a popular system design software that provides an environment for development
and visual programming [1]. By creating user interfaces, LabVIEW development cycles can be
created. Information and data can be passed into the program and the necessary results
generated based on the inputs given. The results can be presented in graphical form,
multidimensional plots or simple numerical representations. This feature has made the use of
LabVIEW easy, user-friendly and it makes the simulation process simpler. When compared
with the other software programs available for engineering simulations such as Matrix
Laboratory (MATLAB), Finite Element Analysis (FEA), PSpice, Proteus, Electromagnetic
Transient Program (EMTP), etc., LabVIEW provides an easier and cheaper alternative to be
able to accomplish similar results. Adopting LabVIEW to simulate induction machines
provides a better alternative to complete the analysis of induction machines.

Isaac Samuel, Adesanya Ayokunle, Adesina Akinmeji, Adenugba Favour, Adebola Soyemi and
Osunlana Ismail
Induction machines are generally adopted in many areas in the world today. Some of these
areas include commercial, industrial and domestic applications. In fact, electric motor systems
constitute the major support for industrial applications and operations [2]. The coupling of
power electronics devices to induction machines have further increased its usage in recent years
owning to its low cost, low weight, reliability and easy maintenance [3] [4]. Although the design
of induction machines can be complex, the adoption of software packages can significantly
reduce this challenge [1]. The understanding and knowledge of the operating principles, as well
as governing mathematical expressions, is important in getting to know how to properly
analyze induction machines [5]. Existing literature and theories provide the necessary directions
in understanding the mechanisms which will be important in design and analysis procedures
[3].
This study presents the use of LabVIEW to determine the characteristics and performance
of induction machines. The experiments completed in this work in order to determine the
characteristics and performance of induction machines includes the equivalent circuit analysis,
load test, and torque-speed characteristics. This study is organized as follows: Section 2 reviews
different kinds of literature for the previous work that has been done in analyzing and modelling
induction machines, Section 3 discusses the methodology, Section 4 provides the results and
discussions and Section 5 concludes the study.
2. LITERATURE REVIEW
The design process of electrical machines is a complex and multi-level task. The determination
of the design parameters that will ensure that the machine operates according to specified limits
is one of the important areas in electrical machine design [6]. The complexity of electrical
machine design and analysis presents some pitfalls that can be significantly taken care of by the
adoption of software applications. The applications can be used to evaluate the efficiency of
electrical machines in terms of the electrical, mechanical and magnetic losses in a quick, easy
and cheap way [6].
Different software programs have been utilized to be able to complete the design processes.
One of the most common software used in electrical machine analysis includes the Finite
Element Method/Finite Element Analysis software (FEM/FEA). FEM/FEA software can be
used to successfully used to analyze the parameters of electrical machines. Stanislav et al.
(2016) utilized this software to model an induction motor in order to obtain the operation
parameters [7]. FEA technique is a powerful tool as it is capable of accurately obtaining design
parameters and electrical machines characteristics. It also has the capability for optimization of
electrical machines [8]. Although, the major downside of the use of FEA is that it takes a lot of
time to build models and determine necessary parameters (Rosu, et al., 2017). It is also not a
very user-friendly software and it is very complex in its usage, requiring special expertise. The
use of MATLAB for electrical machines analysis is also widely accepted by many industries
and researchers [10]. MATLAB has been utilized in many areas to analyze electrical machines.
One of the powerful tools present in MATLAB known has Simulink was used to analyze an
electric DC drive and the results were satisfactory [11]. The essential characteristics of a DC
drive were obtained from this analysis using MATLAB software. Meenakshi and Muthu also
utilized MATLAB software for the analysis of an asynchronous generator [12]. The
performance characteristics of a three-phase induction machine can also be analyzed and
studied effectively using MATLAB and Simulink applications [13]. MATLAB is generally
acceptable and is perhaps one the best computer simulation software for electrical machines,
but it is an expensive software and often requires special expertise to be able to completely
model a working system. The study of the thermal conditions of electrical machines can also
be done with the use of Motor-CAD. The thermal analysis of electrical motors is important in

Induction Machines Analysis Using Labview Software Package
the design process and it allows for the prediction of winding losses on temperature estimation
[14].
The use of LabVIEW has also been adopted by many researchers to determine
characteristics properties of electrical machines. Adopting the use of LabVIEW as compared to
other types of software provides different advantages [3]. Some of these advantages include a
user-friendly interface and easy to use features which can enable even beginners to successfully
complete electrical machine models and analysis. This work utilizes LabVIEW in the study and
analysis of induction motor parameters.
3. METHODOLOGY
In this study, three different experiments were conducted in order to be able to determine the
characteristics and analyze the parameters of induction machines. These experiments include
the equivalent circuit parameters, load test, and the torque-speed relationship of induction
machines. Equations that represent the models that need to be studied and analyzed are first
derived before the utilization of LabVIEW for necessary analysis. The mathematical
expressions that represent the inputs and outputs for the analysis are directly handled with the
aid of graphical representations and block diagrams in the graphical interfacing modes. The
processes in the experimental design are as described in the subsections below:
3.1 Equivalent Circuit Parameters of Induction Machine
The preliminary mathematical equations that are required for the model of the equivalent circuit
parameters are first analyzed before replicating on LabVIEW with the use of the graphical
programming interface. The speed of the magnetic field (synchronous speed) is given as:
nsync =
120f
P
(1)
Where 𝑓 is the frequency in hertz, 𝑃 is denoted as the number of poles in the induction
machine. The slip speed, which is obtained by subtracting the rotor speed from the synchronous
speed is given as:
nslip = nsync − nm (2)
Where 𝑛 𝑠𝑙𝑖𝑝 is the slip speed, 𝑛 𝑠𝑦𝑛𝑐 is the synchronous speed, and 𝑛 𝑚 is the rotor speed.
The slip can then be expressed as a percentage of the slip speed and the synchronous speed
which is given as:
s =
nslip
nsync
× 100% (3)
The rotor current, 𝐼 𝑅 can be expressed as:
IR =
ER
RR + jXR
(4)
Where 𝐸 𝑅 is the rotor voltage, 𝑅 𝑅 is the rotor resistance and 𝑋 𝑅 is the rotor reactance. The
rotor impedance, 𝑍2 becomes:
Z2 = aeff
2
(
RR
s
+ jXR) (5)
Where 𝑎 𝑒𝑓𝑓 is the effective turns ratio of the induction machine. Figure 1 shows the general
equivalent circuit diagram of induction machines.

Osunlana Ismail
Figure 1 shows the equivalent circuit of an induction machine
The mathematical expressions are modelled in LabVIEW where the components are
arranged appropriately and assembled based on the appropriate requirements. The block
diagram that can be used to obtain the equivalent circuit parameters of induction machines is
as shown in Figure 2.
Figure 2 shows the block diagram of the equivalent circuit parameters of induction machines
The input parameters that are used in the analysis of the equivalent circuit is as shown in
Table 1 below:
Table 1 Design and input parameters of an induction machine
Parameter Value
Phase Voltage (𝑉𝑝ℎ)
Number of Poles
220
2
Frequency 50
Stator Turns 40
Rotor Turns 50
Stator Resistance (𝑅1) 1.12
Stator Reactance (𝑋1) 0.6
Rotor Resistance (𝑅 𝑅) 3
Rotor Reactance (𝑋 𝑅𝑂) 0.6

Magnetizing Reactance (𝑋 𝑚) 30
Core Resistance (𝑅 𝐶) 0
Input: Rotor mechanical shaft speed (𝑛 𝑚) 1800
It is important to note that the shaft speed must be less than the synchronous speed, else no
voltage will be induced. Figure 3 shows the design and input parameters of an induction
machine from the front panel of the LabVIEW.
Figure 3 shows the design and input parameters of an induction machine from LabVIEW
3.2 Load test of Induction machine (3 phase)
In order to determine the efficiency of the induction machine, the following analysis is
considered. The stator copper losses, core losses and the rotor losses can be found can be
obtained by using the mathematical expression below:
PSCL = 3I1
2
R1 (6)
The above expression represents the stator copper losses where 𝐼1 represents the input
current that is obtained from the division of the input voltage with the equivalent impedance.
The core losses are expressed as:
Pcore = 3E1
2
GC (7)
The rotor losses can be expressed as:
PRCL = 3I2
2
R2 (8)
Where 𝐼2 represents the rotor current and 𝑅2 represents the rotor resistance. If the losses
expressed above are subtracted from the input power, the remaining power can be converted to
mechanical power, which provides the developed electrical power for the induction machine.
This can be expressed mathematically as follows:
Pconv = 3I2
2
R2 (
1 − s
s
) (9)
The induced torque is given by the equation:
τand =
Pconv
ωm
(10)
By mathematical manipulations, it can be shown that the induced torque is also given as:

Osunlana Ismail
τand =
3VTH
2
R2/s
ωsync[(RTH +
R2
s
)
2
+ (XTH + X2)2]
(11)
Computing the ratio of the output power to the input power provides the efficiency of the
induction machine. Figure 4 shows the block diagram for the load test of an induction machine.
Table 2 presents the design parameters which is used to determine the necessary output
parameters.
Table 2 Design parameters of an induction machine
Parameter Value
Number of Poles
220
2
Frequency 50
Rotational losses 1200
Core losses 0
Input range: Rotor mechanical shaft speed (𝑛 𝑚)
[0 200 300 400 500 700 1000
1300 1600 1800]
It is important to note that the shaft speed must be less than the synchronous speed, else no
voltage will be induced. Varying the value of the shaft speed also causes a corresponding
change in the output values. Figure 5 shows the design and input parameters of an induction
machine from the front panel of the LabVIEW.
Figure 4 shows the block diagram for the load test of an induction machine.

Figure 5 shows design and input parameters from the front panel of LabVIEW
3.3. Torque-Speed Relationship of Induction Machine
This is one of the most important relationships that can describe the behaviour of an induction
machine. When the speed and induced torque of an induction machine are plotted against each
other, some certain characteristics of the induction machine can be studied. The block diagram
that was utilized in LabVIEW for the torque-speed characteristic is as shown in Figure 6. Table
3 shows the design parameters that were used in the torque-speed relationship experiment in
LabVIEW.
Table 3 Design parameters for torque-speed relationship of an induction motor
Parameter Value
Number of Poles
220
2
Frequency 50
Core losses 300
Input: Rotor mechanical shaft speed (𝑛 𝑚)
[-500 -200 0 100 200 400 500
600 800 950 1050 1100 1450
1500 1600 1730 1800 1850 1945
1950 2000 2100 2160 2267
2400]

Osunlana Ismail
Figure 6 shows the block diagram in LabVIEW for the torque-speed characteristic.
Figure 7 shows design parameters in the front panel of the LabVIEW application
The values of the rotor speed used in this analysis must be less than the synchronous speed.
Figure 7 shows the design parameters in the front panel of the LabVIEW application.
4. RESULTS AND DISCUSSIONS
The results obtained from the experiments and analysis done are discussed in this section.
Table 4 shows the result for the equivalent circuit parameters of an induction machine. The
slip, stator current, rotor current and the equivalent impedance are accurately obtained. It can
be observed that by increasing the rotor shaft speed, there is a corresponding increase in the
values of the slip, stator current, rotor current and a decrease in the impedance. Figure 8 shows
the front panel results as obtained from LabVIEW.

Table 4 Design parameters for torque-speed relationship of an induction motor
Parameter Value
Slip 0.4
𝐼1 35.518 – j10.6226
𝐼2 44.3975 – j13.2782
𝑍𝑡𝑜𝑡 5.6855 + j1.70039
Figure 8 shows the front panel results for equivalent circuit
Furthermore, as obtained from the induction machine load test, it can be observed
experimentally that an increase in the shaft speed or rotor speed which is greater than the
synchronous speed will cause the induction machine to act as a generator and the torque is
reversed. Further observations can be made from the induction machine load test. While
constantly varying the values of the design parameters, the behaviour and characteristics of the
induction machine can be determined. The values of the slip, torque, power factor and the output
power decrease with an increase in the rotor speed, however, this leads to higher efficiency.
The output of the motor load test is as displayed in Figure 9 below:
Figure 9 shows the output of the motor load test
The graphical representations in Figures 10-16 describe the behaviour of the induction
machine with varying rotor speed. Increase in the output power, induced torque and power
factor causes the efficiency of the induction machine to reduce as seen in the graphical
representations. Furthermore, it can also be observed that the torque is in a way, directly
proportional to the slip. An increase in torque leads to a corresponding increase in the slip.
Increasing the rotor speed also causes the efficiency of the induction machine to increase as
seen in the graph of the efficiency versus speed relationship.

Osunlana Ismail
Figure 10 shows Efficiency Vs Output
Figure 11 shows the Efficiency Vs Power Factor
Figure 12 shows Efficiency Vs Speed

Figure 13 shows Efficiency Vs Torque
Figure 14 shows Slip Vs Torque
Figure 15 shows Speed Vs Torque

Osunlana Ismail
Figure 16 shows Speed Vs Torque (2)
The result of the torque-speed characteristic of from the LabVIEW analysis can be observed
from the graph in Figure 15. It can be seen that an increase in the rotor speed leads to a decrease
in the induced torque. If the rotor speed is allowed to run less than the synchronous speed, the
induction machine runs as a motor which is the normal operation. However, if the rotor speed
is allowed to run greater than the synchronous speed, the machine acts as an induction
generator. It can be observed from Figure 16 that the speed-torque characteristic accommodates
both the positive and negative section of the graph. When it runs in the positive section, this is
the region where the induction machine acts a motor, otherwise, it acts as a generator. It can
also be observed that the induced torque in an induction machine is zero at synchronous speed.
The results of the speed-torque characteristics as obtained from LabVIEW is shown in Figure
17 below:
Figure 17 shows induced torque and slip values of the torque-speed characteristics
5. CONCLUSION
LabVIEW has been successfully used to analyze and observe the characteristics of induction
machines. The working principles and processes of an induction machine can be simulated and
analyzed with the full knowledge of the mathematical models and equations that governs the
operating characteristics of the induction machines. The work can be improved further and

applied to different machines such as synchronous machines, DC machines and some special
machines. The LabVIEW software is capable of providing a platform in which electrical
machines problems can be settled and solved. Proper modelling and analysis of induction
machines can significantly reduce design and production time, as well as determine the best
operations scenario for maximum efficiency. Finally, the adoption of the software in analyzing
and modelling induction machines can save cost, recover the financial loss and also provide a
platform to investigate the performance characteristics of an induction machine.
REFERENCES
[1] E. Ramprasath and P. Manojkumar, "Modelling and Analysis of Induction Motor using
LabVIEW," International Journal of Power Electronics and Drive System (IJPEDS), vol.
V, no. 3, pp. 344-354, 2015.
[2] A. Adekitan, O. Ayodeji, A. Raphael and S. Isaac, "The performance of a 3-Phase Induction
Machine under Unbalance Voltage Regime," Journal of Engineering Science and
Technology Review, vol. 10, no. 5, pp. 136-143, 2017.
[3] Z. Zhaoxian and M. James, "LabVIEW Simulation of Induction Motors," ASEE Southeast
Section Conference, pp. 1-8, 2009.
[4] I. A. Aderibigbe, A. Adeyinka and O. Alashiri, "Determining the operational status of a
three-phase induction motor using a predictive data mining model," International Journal of
Power Electronics and Drive System (IJPEDS), vol. 10, no. 1, pp. 93-103, 2019.
[5] K. Jabbar, J. Mohammed and I. Masood, "LabVIEW based Electrical Machines Laboratory
for Engineering Education," WSEAS Transactions on Advances in Engineering Education,
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[6] K. Daukaev, A. Rassõlkin, A. Kallaste, T. Vaimann and A. Belahcen, "A review of
electrical machine design processes from the standpoint of software selection," in IEEE 58th
International Scientific Conference on Power and Electrical Engineering of Riga Technical
University, 2017.
[7] K. Stanislav, H. Tomáš, P. Pavel and N. Adam, "FEM model of the asynchronous motor for
analysis of its parameters," ELEKTRO, pp. 315-319, 2016.
[8] G. Marian, K. Cosmin and M. Gheorghe, "Advantages of FEM analysis in electrical
machines optimization used in wind energy conversion systems," IEEE 3rd International
Symposium on Exploitation of Renewable Energy Sources (EXPRES), 2011.
[9] M. Rosu, P. Zhou, D. Lin, D. Ionel, M. Popescu, F. Blaabjerg, V. Rallabandi and D. Staton,
"Fem‐Based Analysis Techniques for Electrical Machine Design," in Multiphysics
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[10] T. Nwodo and O. Okoro, "Simulation Tools for Electrical Machines Modelling: Teaching
and Research," Nigerian Journal of Technology, pp. 33-37, 2015.
[11] K. Miklosevic, Ž. Špoljarić and V. Jerkovic, "Analysis of Electric DC Drive Using Matlab
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[12] R. Meenakshi and R. Muthu, "Study and analysis of full order asynchronous generator in
Matlab-Simulink environment," in Proceedings of IEEE International Conference on
Circuit, Power and Computing Technologies, ICCPCT , 2013.
[13] A. Sangeetha and B. Parthiban, "Review of Modeling and Dynamic Analysis of Three-
Phase Induction Motor Using MATLAB Simulink," International Journal of Science,
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[14] S. Dave, H. Douglas and P. Mircea, Motor-CAD Software for Thermal Analysis of
Electrical Motors - Links to Electromagnetic and Drive SimulationModels, 2010.

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