18-04-2012, 03:22 PM
WIRELESS CONTROL OF IRRIGATION SYSTEM OPERATING FROM INDUCTION MOTOR FED BY SUPPLY
Wireless_control_of_irrigation_system.pdf (Size: 89.68 KB / Downloads: 256)
INTRODUCTION
There have not been any significant technological
advancements being made in agricultural sector as
compared to other sectors. Irrigation system needs to be
monitored on a regular basis. The first aim of the project is
to reduce the wastage by automating the entire irrigation
system. The three-phase supply system in now available
worldwide, except perhaps in some rural areas where only a
single phase supply is available. The second aim of our
project is to tackle this issue, thereby enabling the operation
of these pumps even in the absence of three phase supply.
PROBLEM DEFINITION
The moisture content of the field is not monitored and it is
manually observed by the farmers which are prone to errors.
DESIGN AND IMPLEMENTATION
The technical details of the project contain block diagram,
circuit connections and detailed explanation of various
components used. The analysis is split into two parts
CONCLUSION
The design and implementation of a controlled capacitor for
a three-phase induction motor operating from single phase
supply has been presented by using a fixed capacitor in
series with an electronic switch. The proposed system
eliminates the use of mechanical or centrifugal switches
which is located inside the motor. This avoids the possibility
of the switch failure and leads to less operational and
maintenance cost and improves the system reliability. The
optimum effective capacitor value can be on-line adjusted at
any operating speed by periodically changing the duty cycle
of the controlled switch to achieve minimum unbalance in
phase voltages or any other optimization criteria to improve
the motor performance at different speeds.