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1. EMBEDDED SYSTEM INTEGRATED INTO A WIRELESS
SENSOR NETWORK FOR ONLINE DYNAMIC TORQUE AND
EFFICIENCY MONITORING IN INDUCTION MOTORS
Abstract:
In an industrial environment, mechanical systems driven by electric motors are used in
most production processes, accounting for more than two-thirds of industry electricity
consumption. Regarding the type of motors usually employed, about 90% are three-phase ac
induction based, mainly due to its cost effectiveness and mechanical robustness. Torque is one of
the main parameters for production machines. In several industry sectors, torque measurements
can identify equipment failure, which makes their monitoring essential in order to avoid disasters
in critical production processes (e.g., oil and gas, mining, and sugar and alcohol industries).
Existing system:
There are different methods to measure efficiency in induction motors, which are based
on dynamometer, duplicate machines, and equivalent circuit approaches. Their application for inservice motors is impractical, because it requires interrupting the machine’s operation to install
the instruments.
Proposed system:
In the proposed system, the AGT method was used for the estimation of the motor shaft
torque and efficiency, because it is the noninvasive method for determining torque and efficiency
that has less uncertainty. The voltage and current taken by the single phase induction motor is
measured and the Air Gap Torque (AGT) is estimated. The rotor speed is measured using speed
sensor. With the two obtained values the efficiency is estimated. The estimated values are
transmitted to the information collecting sensor. Hence the less efficient motor can be removed
immediately.

2. Block Diagram:
Machine Section:
Power
Supply
LCD
PIC
Speed Sensor
Zigbee
Driver
Circuit
Induction
Motor
16F877A
Voltage Sensor
Micro
Controller
Current Sensor
Collecting Section:
Power
Supply
Zigbee
MAX
232
MAX
232

3. Hardware requirements:
 PIC16F877A Microcontroller with Power Supply
 Zigbee
 Max 232
 LCD
 Single Phase Induction Motor
 Speed Sensor
 Voltage Sensor
 Current Sensor
 PC with .net
Software requirements
 Embedded c
 MPLab Compiler or CCS Compiler
 VB .net
Advantages
 There is a large reduction in the amount of transmitted data, enabling real-time and
dynamic monitoring of multiple motors.
 Power consumption is less.