ABSTRACT:
This paper presents a power factor correction (PFC)
based bridgeless-Luo (BL-Luo) converter fed brushless DC (BLDC) motor drive. A
single voltage sensor is used for the speed control of BLDC motor and PFC at AC
mains. The voltage follower control is used for a BL-Luo converter operating in
discontinuous inductor current mode (DICM). The speed of the BLDC motor is
controlled by an approach of variable DC link voltage, which allows a low
frequency switching of voltage source inverter (VSI) for electronic commutation
of BLDC motor; thus offers reduced switching losses. The proposed BLDC motor
drive is designed to operate over a wide range of speed control with an
improved power quality at AC mains. The power quality indices thus obtained are
under the recommended limits of IEC 61000-3-2. The performance of the proposed
drive is validated with test results obtained on a developed prototype of the
drive.
KEYWORDS:
1.
Bridgeless Luo
Converter
2.
Brushless DC motor
3.
Power Factor
Correction
4.
Power Quality
5.
Voltage Source
Inverter
SOFTWARE: MATLAB/SIMULINK
Fig.
1. Proposed PFC BL-Luo Converter fed BLDC motor drive.
EXPECTED SIMULATION RESULTS:
Fig.
2. Test results of proposed BLDC motor drive (a) At rated load torque on BLDC motor with Vdc=50V and Vs=220V,
(b) At rated load torque on BLDC motor with Vdc=200V and Vs=220V
Fig.
3. Test results of proposed BLDC motor drive showing (a) iLi1, iLo1, VC1 with
Vs, (b) PFC converter’s switch voltage and current at rated load torque on BLDC
motor (c) Enlarged waveforms of PFC converter’s switch voltage and current.
Fig.
4. Test results of proposed BLDC motor drive showing dynamic performance (a)
during starting at 50V, (b) during change in DC link voltage from 100V to 150V,
(c) during change in supply voltage from
250
to 180V.
CONCLUSION:
A
PFC based BL-Luo converter fed BLDC motor drive has been proposed for wide
range of speeds and supply voltages. A single voltage sensor based speed
control of BLDC motor using a concept of variable DC link voltage has been
used. The PFC BL-Luo converter has been designed to operate in DICM and to act
as an inherent power factor preregulator. An electronic commutation of the BLDC
motor has been used which utilizes a low frequency operation of VSI for reduced
switching losses. The proposed BLDC motor drive has been designed and its
performance is simulated in MATLAB/Simulink environment for achieving an
improved power quality over wide range of speed control. Finally, the performance
of proposed drive has been verified experimentally on a developed hardware
prototype. A satisfactory performance of proposed drive has been achieved and
is a recommended solution for low power applications.
REFERENCES:
[1]
C. L. Xia, Permanent Magnet Brushless DC Motor Drives and Controls,
Wiley Press, Beijing, 2012.
[2]
T. Kenjo and S. Nagamori, Permanent Magnet Brushless DC Motors, Clarendon
Press, Oxford, 1985.
[3]
R. Krishnan, Electric Motor Drives: Modeling, Analysis and Control, Pearson
Education, India, 2001.
[4]
T. J Sokira and W. Jaffe, Brushless DC Motors: Electronic Commutation and
Control, Tab Books, USA, 1989.
[5]
H. A. Toliyat and S. Campbell, DSP-based Electromechanical Motion Control,
CRC Press, New York, 2004.
