This project controls and monitors the speed of a three-phase induction motor using an Arduino and Node MCU controller. The Arduino implements PWM to control the motor speed using a three-phase driver circuit. Node MCU is used to increase and decrease the speed and establishes feedback of the speed to the Node MCU, which transmits the signal over Wi-Fi. This allows remote control of the motor speed through an IP address. The hardware components include a power supply, transformer, rectifier, inverter, driver circuit, Node MCU, Arduino and connecting wires. MATLAB is used to simulate the three-phase inverter and hardware results are obtained.

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Abstract-- This project is built up to control and
monitor the speed of the three-phase induction
motor by introducing the Arduino and node MCU
controller as the key roles. Arduino is used for
implementing the pulse width modulation (PWM)
signal and the speed of the motor is controlled by
using three-phase and driver circuits. And also, in
this project the harmonics and switching losses of
the circuit will be reduced. Here, Node MCU is
used to increase and decrease the induction motor’s
speed. The feedback of the speed connection is
established to Node MCU controller and thus, the
Node MCU transfer the speed signal through Wi-
Fi.
With the help of IP address and logging into it, we
can control the speed by our self within the
permissible bandwidth of Wi-Fi.
I. INTRODUCTION
The Internet of Things (IOT) is a network of
physical objects are embedded with devices,
sensor, network connectivity are provided with
unique identifiers and the ability to automatically
collect and transfer data over a network without
requiring human-to-human or human-to-computer
interaction. IOT has evolved from the convergence
of wireless technologies, micro-electro mechanical
systems and the Internet. The internet of things
also called an Internet of objects. Online
monitoring system for continuous casting
equipment is established based on IOT sensing
technology and communication technology.
The parameters such as voltage, current, speed and
torque of induction motor were monitored. So,
input values or parameters are maintained in limits
and speed of the induction motor in a controlled
manner. IOT achieves the Industrial automation
through remote access and also increases the
operational efficiency, lower costs, and improve
productivity in automation. The various control
methods are: Field control method, Armature
control method, Ward-Leonard method. And the
new trend of controlling leading to the IOT
based
The benefits by adopting IOT are highly
automated, improves efficiency, reduce the
manual work and can be operated from various
place and Easy to access.
II. BLOCK DIAGRAM
SYSTEM HARDWARE COMPONENTS
1) Power supply
2) Step down transformer
3) Rectifier and Filter
4) Three Phase Inverter Board
5) TLP 250 Driver Board
6) Node MCU Controller
7) Arduino
8) System
9) Connecting wires
B. Sai Praneeth1
, B. Rakesh1
, K. Karthik Reddy1
, P. Jyothi Swaroop1
, J. Srinivasa Rao2
UG students1
, Associate professor2
, Department of Electrical and Electronics Engineering,
VNR VJIET, JNTU, Hyderabad, India.
SPEED CONTROL OF INDUCTION
MOTOR USING IOT

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III. EXPLANATION OF COMPONENTS
1) POWER SUPPLY:
A Power supply used to supply the electrical power
to the electric load. This is usually applied to
power converter which converts one form
of an electrical energy to another form
of an energy like mechanical, solar, electrical to
solar energy.
Depending on its structure, a supply can get energy
from an Electrical energy transmission system.
Different examples which convert voltages of AC
to DC are mentioned below:
1) Energy storage devices like fuel
cells & batteries
2) Electro-mechanical devices or systems
like generators & alternators.
3) From solar energy which is obtained from the
sun.
2) TRANSFORMER:
Step Down Transformer:
When AC is applied to the primary winding of the
power transformer it can either do stepping down
or up based on the value of DC needed. In this
circuit the transformer rating of 230v/0-12v is used
to perform the operation of step-down where a
230V AC converts into 12V AC across the
secondary winding. The top of the transformer to
be positive and the bottom negative is caused by
altering the one of the inputs. The succeeding
alteration will cause the reverse temporarily. 1A
current rating of the transformer is used in the
project and also, it gives isolation between power
supply circuits and the power source.The are used
to step down high voltages from 11000v to 220v or
110v and also from 220v or 110v to 10, 12, 20 or
24 volts etc.
The induced EMF in the secondary winding is
proportional to the number of turns on both the
primary and secondary winding's Because, of same
magnetic flux lines cut both coils of a transformer.
The secondary output voltage will be less than the
primary input voltage because the number of turns
on the secondary winding is less than the number
of turns on the primary winding. This type is called
stepdown
transformer
.
3) RECTIFIERS:
A rectifier is a device which converts alternating
current (AC) to direct current (DC), which flows
in only one direction and this process is known
as rectification. Rectifiers are of different types
like vacuum tube diodes, mercury-arc valves,
copper and selenium oxide
rectifiers, semiconductor diodes, silicon-
controlled rectifiers and other silicon-based
semiconductor switches.
Rectifiers have numerous uses, but are found
working as components of DC power
supplies and high-voltage direct current power
transmission systems.
In a center tapped full wave rectifier, both
positive and negative half cycles are rectified.
So, no voltage is wasted at the output.
Furthermore, the DC output produced by center
tapped half wave rectifier is less smoother than
the full wave rectifier output
FILTERING UNIT:
Filter circuits which are capacitors acts as a
surge arrester and always follow the rectifier
unit. This is also called as a bypassing capacitor
or decoupling capacitor. It is used not used to
leave the frequency of the DC to appear at the
output but also to ‘short’ the ripple with
frequency of 120Hz to ground. A load resistor
R1 is connected so that a reference to the ground
is maintained. C2R2 is used as a low pass filter,
C1R1 is for bypassing ripples i.e. it passes only
low frequency signals and bypasses high
frequency signals. The load resistor should be
1% to 2.5% of the load.
O, 1Ω f: It is for bypassing the high frequency
disturbances.
10Ω f/25v: It is for maintaining the stability of
the voltage at the load side.
1000Ω f/25v: It is for the reduction of ripples
from the pulsating.

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4) Three Phase Voltage Source Inverters
Single-phase VSIs and three phase VSIs covers
low-range power and high- range applications
respectively. The main purpose of these concepts is
to provide a 3-phase voltage source, where the
voltage, phase, amplitude of the voltages should
always control and also most of the applications
require sinusoidal voltage waveforms, arbitrary
voltages are also required in some emerging
applications like active filters, voltage
compensators.
A) SINUSOIDAL PULSE WIDTH
MODULATION
In Power electronics, The Sinusoidal Pulse Width
Modulation (SPWM) is a well-known as wave
shaping technique for realization, a high frequency
triangular carrier signal, V1 is compared with a
sinusoidal reference signal V of the desired
frequency. Modulation index is the magnitude ratio
of the reference signal (Vr,) to that of triangular
signal (Vc).
B) PULSE WIDTH MODULATION
When a PWM signal is given to the gate of a
power transistor then it causes the turn on and
turns off intervals to change from one PWM
period to another PWM period according to the
same modulating signal. The frequency of a
modulating signal is much lower than the
PWM signal. So, the energy and its load of the
motor depends mostly on the modulating
signal
5) DRIVER CIRCUIT COMPONENTS
Below mentioned components are used to
amplify and triggering the pulses. They are:
1)OPTOCOUPLER
2) BUFFER IC
3) TRANSISTOR
OPTOCOUPLER:
Optocouplers normally in a small 6-pin or 8-
pin IC package, however are basically a mix of
two distinct devices an optical transmitter,
typically a gallium arsenide LED and an
optical receiver, like a photo-transistor or light-
triggered diac. These two are isolated by a
transparent barrier which obstructs any
electrical flow between the two, however
allows the passage of light. The essential
thought is appeared in Fig.1, alongside the
standard circuit image for an optocoupler.
BUFFER IC –CD4050:
The CD4050BC hex buffers are monolithic
complementary MOS (CMOS) incorporated
circuits built with N-and P-channel
enhancement-mode transistors. These devices
high light logic level conversion utilizing just a
single supply voltage (VDD). The input signal
high level (VIH) can exceeds the VDD supply
voltage when these devices are utilized for logic
level conversions. These devices are planned for
use as hex buffers, CMOS to DTL/TTL
converters
6) Node MCU:
Node MCU is an opensource IoT platform,
which includes firmware which keeps running
on the ESP8266 Wi-Fi SoC from Espress if
Systems, and equipment which depends on the
ESP12 module. The term Node MCU naturally
relates to the firmware instead of the
development kits. The firmware utilizes
the Lua scripting language which is based on
the eLua project, and based on the Espress if
Non-OS SDK for ESP8266. It utilizes many
open source ventures, for example, lua-
cjson and SPIFFS.
7) ARDUINO/EMBEDDEDSYSTEMS

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An embedded system is a special-purpose
computer system designed to perform one or a few
dedicated functions, often with real-time
computing constraints. It is usually embedded as
part of a complete device including hardware and
mechanical parts. In contrast, a general-purpose
computer, such as a personal computer, can do
many different tasks depending on programming.
Embedded systems have become very important
today as they control many of the common devices
we use.
7) SYSTEM:
A PC framework enables clients to enter, control
and store information. PC frameworks normally
incorporate a PC, screen, console, mouse and other
optional components. Yes, you need a PC to
program Arduino. once programmed, it will run
without the PC. The Arduino isn't powerful enough
to run software. You would normally connect it
via the network / internet to a server to process
data
8) CONNECTING WIRES:
connecting wires enables an electrical current to
go from one point on a circuit then onto the next
that because power needs a medium through
which it can move. The vast majority of the
connecting wires are comprised of copper or
aluminum. Copper is cheap and great
conductivity. Rather than the copper, we can
likewise utilize silver which has high
conductivity however it is too costly to even
think about using.
CONNECTION BETWEEN ARDUINO-
DRIVER CIRCUIT - NODE MCU
III. MATLAB SIMULATION FOR 3-PHASE
VOLTAGE SOURCE INVERTER
(180 DEGRESS CONDUCTION MODE)
IV. HARDWARE IMPLEMENTATION
MATLAB/ SIMULATION RESULT:

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HARWARE RESULT :
V. CONCLUSION
This project results the design and implementation
of Internet of things for control the function of the
3-phase motor using technique of wireless
communication. The major idea is long-distance
connectivity between location of the machine and
user and also to provide flexible. The major
advantages of the developed system are to have a
continuous monitoring over industrial applications
and also providing e for agricultural application
which control the induction motor. This work is
mainly focused on the improvement of a reliable
smart Industrial monitoring and controlling system.
By this efficiency of the system can be further
improved.
VI. REFERENCES
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turkey(2014).
[2] “Real-Time Monitoring and Control of the
Parameters of an Induction Motor", Department
Of Electrical and Electronics Engineering,
Technology of Faculty, Gazi
UniversityTeknikokullar Ankara, Turkey .
[3] Woodford, “induction motors”, [online].
Available:
http://www.explainthatstuff.com/induction-
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