ABSTRACT:
This paper
presents a power factor corrected (PFC) bridgeless (BL) buck–boost converter-fed
brushless direct current (BLDC) motor drive as a cost-effective solution for
low-power applications. An approach of speed control of the BLDC motor by
controlling the dc link voltage of the voltage source inverter (VSI) is used
with a single voltage sensor. This facilitates the operation of VSI at
fundamental frequency switching by using the electronic commutation of the BLDC
motor which offers reduced switching losses. A BL configuration of the
buck–boost converter is proposed which offers the elimination of the diode
bridge rectifier, thus reducing the conduction losses associated with it. A PFC
BL buck–boost converter is designed to operate in discontinuous inductor
current mode (DICM) to provide an inherent PFC at ac mains. The performance of the
proposed drive is evaluated over a wide range of speed control and varying
supply voltages (universal ac mains at 90–265 V) with improved power quality at
ac mains. The obtained power quality indices are within the acceptable limits
of international power quality standards such as the IEC 61000-3-2. The performance
of the proposed drive is simulated in MATLAB/Simulink environment, and the
obtained results are validated experimentally on a developed prototype of the
drive.
KEYWORDS:
1. Bridgeless (BL) buck–boost converter
2. Brushless direct current (BLDC) motor
3. Discontinuous
inductor current mode (DICM)
4. Power factor
corrected (PFC)
5. Power quality
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig.
1. Proposed BLDC motor drive with front-end BL buck–boost converter.
EXPECTED SIMULATION RESULTS:
Fig.
2. Steady-state performance of the proposed BLDC motor drive at rated conditions.
Fig.
3. Harmonic spectra of supply current at rated supply voltage and rated
loading
on BLDC motor for a dc link voltage of (a) 200 V and (b) 50 V.
Fig.
4. Dynamic performance of proposed BLDC motor drive during (a) starting, (b)
speed control, and (c) supply voltage variation at rated conditions.
Fig.
5. Harmonic spectra of supply current at rated loading on BLDC motor
with
dc link voltage as 200 V and supply voltage as (a) 90 V and (b) 270 V.
Fig.
6. Steady-state performance of the proposed BLDC motor drive at rated
conditions
with dc link voltage as (a) 200 V and (b) 50 V.
CONCLUSION:
A PFC BL
buck–boost converter-based VSI-fed BLDC motor drive has been proposed targeting
low-power applications. A new method of speed control has been utilized by
controlling the voltage at dc bus and operating the VSI at fundamental frequency
for the electronic commutation of the BLDC motor for reducing the switching losses
in VSI. The front-end BL buck–boost converter has been operated in DICM for
achieving an inherent power factor correction at ac mains. A satisfactory performance
has been achieved for speed control and supply voltage variation with power
quality indices within the acceptable limits of IEC 61000-3-2. Moreover,
voltage and current stresses on the PFC switch have been evaluated for determining
the practical application of the proposed scheme. Finally, an experimental prototype
of the proposed drive has been developed to validate the performance of the
proposed BLDC motor drive under speed control with improved power quality at ac
mains. The proposed scheme has shown satisfactory performance, and it is a
recommended solution applicable to low-power BLDC motor drives.
REFERENCES:
[1] C. L. Xia, Permanent Magnet
Brushless DC Motor Drives and Controls. Hoboken, NJ, USA: Wiley, 2012.
[2] J. Moreno, M. E. Ortuzar, and J. W.
Dixon, “Energy-management system for a hybrid electric vehicle, using ultracapacitors
and neural networks,” IEEE Trans. Ind. Electron., vol. 53, no. 2, pp.
614–623, Apr. 2006.
[3] Y. Chen, C. Chiu, Y. Jhang, Z. Tang,
and R. Liang, “A driver for the singlephase brushless dc fan motor with hybrid
winding structure,” IEEE Trans. Ind. Electron., vol. 60, no. 10, pp.
4369–4375, Oct. 2013.
[4] X. Huang, A. Goodman, C. Gerada, Y.
Fang, and Q. Lu, “A single sided matrix converter drive for a brushless dc motor
in aerospace applications,” IEEE Trans. Ind. Electron., vol. 59, no. 9,
pp. 3542–3552, Sep. 2012.
[5] H. A. Toliyat and S. Campbell, DSP-Based
Electromechanical Motion Control. Boca Raton, FL, USA: CRC Press, 2004.
