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1. Sensor less Control of BLDC Motor Drive for an
Automotive Fuel Pump Using a Hysteresis Comparator
Abstract:
This paper develops the brushless dc (BLDC) Motor sensor less control
system for an automotive fuel pump. The sensor less techniques that are based on a
hysteresis comparator and a potential start up method with a high starting torque
are suggested. The hysteresis comparator is used to compensate for the phase delay
of the back EMFs due to a low pass filter (LPF) and also prevent multiple output
transitions from noise or ripple in the terminal voltages. The rotor position is
aligned at standstill for maximum starting torque without an additional sensor and
any information of motor parameters. Also, the stator current can be easily
adjusted by modulating the pulse width of the switching device during alignment.
Some experiments are implemented on a single chip DSP controller to demonstrate
the feasibility of the suggested sensorless and start up techniques.

2. Block diagram:
1 ph ac supply BLDC
TOOLS AND SOFTWARE USED:
 MP LAB
 ORCAD/PSPICE
 MATLAB/SIMULINK
OUTPUT:
 HARDWARE
 SIMULATION
MOTOR
BRIDGE
RECTIFIER AND
FILTER
VSI INVERTER
DRIVE CIRCUIT
MICROCONTROLLER
BRIDGE RECTIFIER
AND VOLTAGE
REGULATOR
STEP DOWN
TRANSFORMER
BACK EMF
FROM MOTOR
HYSTERESIS
COMPARATOR