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) 50V.
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..
