Challenge

Week-7 Challenge: DC Motor Control

1.BJT_H bridge: Bipolar juction transistor uses for power switching apps, operates an IGBT.

when it is conducting BJT operating in saturated region aforward voltage develps between emitter and collector.

so IGBT BLOCK IS USED FOR MODEL TH BJT DEVICE.
The h bridge consists of four BJT diode pairs
2 transistors switches simultaneously.
q1 and q4 or q2 and q3.
when q1 and q4 are triggered a + voltage applied to the motor and the remaining diodes as free wheeling diodes when they switched off
when q2and q3 are trigger a - voltage is applied to the motor and the remaining diodes as free wheeling diode as they are switch off.

FROM THE OBSERVATION OF THE GRAPHS AS PULSE WIDTH DECREASES THE STEP VALUE OF THE ARMATURE CURRENT DECREASES..

WE CAN CHANGE THE PULSE WIDTH IN THE BLOCK ITSELF. THEN WE CAN OBSERVE DIFFERENT PLOTS.

2. FOUR QUADRANT CHOPPER DC DRIVE BLOCK:

STABILITY OF THE VOLTge AND CURRENT IS HIGHER IN FOURTH QUADRANT COMPARED TO BJT AS THE FOURTH QUADRANT USES THE STEP BY STEP RAMPING STRATEGY FOR CHANGE IN DIRECTION SO STABILIT IS LOST.
REGENERATIVE BRAKINGIS CAN BE DONE BUT NOT IN BJTS I.E IN 4 QUADRANT.
MAINLY USED IN VEHICLES FOR CONTROL SPEED AND DIRECTIION IN 4 QUADRANT, WHEREAS BJTS IN ELECTRO MECHANICAL DEVICES FOR CONTROL.
4 QUADRANTS GIVES BETTER EFFICIENCY WHEN OPERAATES IN HIHGH POWER LEVELS BUT BJTS IN MODEATE LEVEL.

3.TWO QUADRANT CHOPPER DC DRIVE REPRESENTS A TWO QUADRANTS DRIVE FOR DC MOTORS.

TWO QUADRANT OPERATION OF CLOSED LOOP SPEED CONTROL.
ADVANTAGES ARE COMPARED TO DC DRIVES IT IS COMPACT AND CAN OPERATE IN TWO QUADRANTS(FORWARD MOTORING AND REVERSE REGENERATION).
DUE TO HIGH SWITCHING FREQUENCY DC TO DC CONVERTERS ASMALL RIPPLE IS OBTAINED OF Ra.
THE TWO QUADRANT BLOCK MODEL IS MADE BY OBSERVING TYPE C CHOPPER OF SECOND QUADRANT MODEL
BLOCKS USED ARE:
POWERGUI,MOSFET,DIODE,CURRENT AND VOLTAGE MEASUREMENTS, SCOPE,PULSE GENERATOR,NOT GATE LOGIC OPERATOR, RLC SERIES
AND OUTPUT WAVE FORMS ARE OBTAINED FOR AL THE VOLTAGE CURRENT AND INPUT PULSE WAVEFORM.

4.BLDC MOTOR:

BRUSHLESS DC ELECTRIC MOTOR ALSO KNOWN AS ELECTRONICALLY COMMUTATED MOTOR.
USES AN DIRECT CURRENT POWER SUPPLY.
USES AN ELECTRONIC CLOSED LOOP CONTROLLER TO SWITCH DC CURRENTS TO MOTOR WINDINGS PRODUCES MAGNETIC FIELD WHICH HELPD IN ROTATING MAGNETIC FIELD.
CONSTRUCTION IS SIMILAR TO PERMANENT MAGNET SYNCHRONOUS MOTOR OR AN INDUCTION MOTOR.
ADVANTAGES ARE HIGH POWER TO WEIGHT RATIO HIGH SPEED NEARLY INSTANT CONTROL OF SPEED AND TORQUE
HIGH EFFICIENCY AND LOW MAINTENANCE.
APPLICATION IN SUCH PLACES IN COMPUTER WORLD PERIPHERALS
WASHING MACHINES BLDC ALLOWED REPLACEMENTS.

Ship work like this
in your own course.