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Direct Torque Control of Brushless DC Motor Drives
With Improved Reliability
Mourad Masmoudi, Bassem El Badsi, and Ahmed Masmoudi
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 50, NO. 6, NOVEMBER/DECEMBER 2014
ABSTRACT
• THIS PAPER DEALS WITH THE SYNTHESIS AND IMPLEMENTATION OF A NOVEL DIRECT TORQUE
CONTROL (DTC) STRATEGY DEDICATED TO THE CONTROL OF BLDC MOTOR DRIVES.
• COMPARED WITH THE MOST RECENT AND HIGHLY PERFORMED DTC STRATEGY, THE PROPOSED
ONE OFFERS IMPROVED RELIABILITY DUE TO THE ACHIEVEMENT OF BALANCED SWITCHING
FREQUENCIES OF THE INVERTER UPPER AND LOWER INSULATED-GATE BIPOLAR TRANSISTORS,
ON ONE HAND, AND THE REDUCTION IN THE AVERAGE VALUE OF THE MOTOR COMMON
MODE VOLTAGE, ON THE OTHER HAND.
• THE TORQUE RIPPLE IS SIGNIFICANTLY DAMPED DURING SECTOR-TO-SECTOR COMMUTATIONS
USING A THREE-LEVEL HYSTERESIS TORQUE CONTROLLER.
INTRODUCTION
• IN RECENT YEARS, VARIABLE SPEED DRIVES EQUIPPED WITH BLDC MOTORS HAVE BEEN
EXTENSIVELY INTEGRATED IN VARIOUS APPLICATIONS, PARTICULARLY IN AUTOMOTIVE
INDUSTRY UTILITIES [1] [2] [3].
• BLDC MOTORS ARE CHARACTERIZED BY A HIGH POWER FACTOR, HIGH EFFICIENCY, AND
SIMPLE SENSORLESS CONTROL STRATEGIES, WHICH REPRESENT A CRUCIAL COST BENEFIT FOR
DIFFERENT LARGE-SCALE PRODUCTION INDUSTRIES.
INTRODUCTION
• THE MOST RECENT AND HIGHLY PERFORMED ONE HAS BEEN PROPOSED BY ZHU AND LEONG
[25].
• ALTHOUGH A NOTABLE ATTENUATION OF THE TORQUE RIPPLE HAS BEEN GAINED USING THIS
STRATEGY.
• IT HAS BEEN NOTICED THAT IT YIELDS UNBALANCED SWITCHING FREQUENCIES OF THE
INVERTER UPPER AND LOWER INSULATED-GATE BIPOLAR TRANSISTORS (IGBTS), ON ONE HAND,
AND A RELATIVELY HIGH AVERAGE VALUE OF THE COMMON-MODE VOLTAGE (CMV) OF THE
BLDC MOTOR.
PROBLEM FORMULATION
PROBLEM FORMULATION
• THE VOLTAGE SOURCE INVERTER FEEDING THE BLDC MOTOR IS THE CONVENTIONAL SIXSWITCH THREE-PHASE INVERTER (SSTPI).
PROBLEM FORMULATION
STUDY BACKGROUND
STUDY BACKGROUND
STUDY BACKGROUND
• ACCOUNTING FOR THE ABOVE, ONE CAN CLEARLY NOTICE THAT THE RELIABILITY OF THE
INVERTER IS COMPROMISED BY THE UNBALANCED SWITCHING FREQUENCIES OF THE UPPER
AND LOWER IGBTS.
• MOREOVER, THE RELIABILITY OF THE BLDC MOTOR TURNS TO BE AFFECTED IN SO FAR AS ITS
LIFE SPAN IS LIMITED BY THE GENERATED CMV.
STUDY BACKGROUND
CASE STUDY
SIMULATION RESULTS
SIMULATION RESULTS
SIMULATION RESULTS
SIMULATION RESULTS
SIMULATION RESULTS
CONCLUSION
• THIS PAPER HAS PROPOSED A NOVEL DTC STRATEGY DEDICATED TO THE CONTROL OF BLDC
MOTOR DRIVES.
• COMPARED WITH THE MOST RECENT AND HIGHLY PERFORMED DTC STRATEGY DEVELOPED BY
ZHU AND LEONG, THE PROPOSED ONE MAKES IT POSSIBLE THE IMPROVEMENT OF THE DRIVE
RELIABILITY DUE TO 1) THE BALANCING OF THE SWITCHING FREQUENCIES OF THE INVERTER
UPPER AND LOWER IGBTS AND 2) THE SIGNIFICANT REDUCTION IN THE AVERAGE VALUE OF
THE MOTOR CMV. THIS HAS BEEN CARRIED OUT THROUGH THE APPLICATION OF APPROPRIATE
NULL VOLTAGE VECTORS TO DECREASE THE ELECTROMAGNETIC TORQUE.