Assessing pulse-width modulation techniques for brushless dc motor drives
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Transcript of Assessing pulse-width modulation techniques for brushless dc motor drives
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Department of Electrical Engineering Southern Taiwan University
Department of Electrical Engineering Southern Taiwan University
Robot and Servo Drive Lab.
Assessing pulse-width modulation techniques for brushless dc motor
drives
Student: Tai-Rong Lai
PPT製作率 :100%
Professor: Ming-Shyan Wang
112/04/19
BY YEN-SHIN LAI & YONG-KAI LINIEEE INDUSTRY APPLICATIONS MAGAZINE ∙SEPT j OCT 2008 ∙
WWW. IEEE.ORG/IAS pp34-44.
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2Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Outline Abstract
PWM techniques for BLDCM Drive
Driver Circuit
Reversal dc-Link Current
Circulating Current of Floating Phase
Back EMF Detection
Assessment of PWM Techniques—Theoretical Analysis and Experimental Confirmation
Conclusions
References
112/04/19
Robot and Servo Drive Lab.2
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3Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Abstract
The aim of this article is to assess the PWM techniques for BLDCM drives.
• Driver circuit
• Reversal dc-link current
• Circulating current of floating phase
• Back-EMF
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4Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
PWM techniques for BLDCM Drive
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5Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
PWM techniques for BLDCM Drive
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6Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
PWM techniques for BLDCM Drive
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7Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Driver Circuit
Photocoupler driver
Isolated transformer driver
Bootstrap driver
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8Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Photocoupler driver
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9Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Isolated transformer driver
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10Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Bootstrap driver
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11Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Driver Circuit
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12Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Reversal dc-Link Current
CH1:chopper CH2:Vu CH3:Iu CH4:Idc
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13Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Reversal dc-link current, phase U
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14Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Circulating Current of Floating Phase
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15Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Circulating Current of Floating Phase
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16Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Back EMF Detection
Vp:denotes the terminal voltage for the phase connected to the positive dc-link rail during PWM control period.
Vn indicates the terminal voltage for the phase connected to the negative dc-link rail.
Vo is the terminal voltage for the floating phase.
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17Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Back EMF Detection
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18Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Assessment of PWM Techniques—Theoretical Analysis and Experimental Confirmation
Block diagram of the sensorless experimental system
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19Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Motor specifications
Number of poles=8 Rated power=70W V dc= 24 V Rated speed=2,500 rpm
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20Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
CH1: high-side control, CH2: low-side control, CH3: terminal voltageCH4: phase current, duty = 20%.
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21Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
CH1: high-side control, CH2: low-side control, CH3: terminal voltageCH4: phase current, duty = 80%.
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22Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
CH1: high-side control, CH2: low-side control, CH3: terminal voltageCH4: dc-link current, duty = 20%.
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23Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
CH1: high-side control, CH2: low-side control, CH3: terminal voltageCH4: dc-link current, duty = 80%.
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24Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
CH1: terminal voltageCH2: phase current, duty = 80%.No load
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25Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
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26Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
Conclusions
The aim of this article is to assess the special features of five PWM techniques for BLDCM control. As shown here, the indexes include reversal dc-link current, circulating current, driver circuit, and back-EMF detection. Theoretical analysis is presented and followed by the experimental results. An inverter-controlled BLDCM drive without using any hall sensor and current sensor is set up. Experimental results fully support the analysis. These results provide the whole picture for applications reference.
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27Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
References
[1] Seiko Epson Corp., ‘‘Brushless dc motor without position sensor and its controller,’’ E.P. Patent 0 553 354 B1, 1993.
[2] Tokyo Shibaura Electric Co., ‘‘Inverter and air conditioner controlled by the same,’’ U.S. Patent 5 486 743, 1996.
[3] ST Microelectronics, ‘‘Control of a brushless motor,’’ U.S. Patent 5 859 520, 1999.
[4] J. Shao, D. Nolan, M. Teissier, and D. Swanson, ‘‘A novel microcontroller-based sensorless brushless dc (BLDC) motor drive for automotive fuel pumps,’’ IEEE Trans. Ind. Appl., vol. 39, pp. 1734–1740, Nov./Dec. 2003.
[5] G. J. Su and J. W. McKeever, ‘‘Low-cost sensorless control of brushless dc motors with improved speed range,’’ IEEE Trans. Ind. Applicat., vol. 19, pp. 296–303, Mar. 2003.
[6] R. C. Becerra, T. M. Jahns, and M. Ehsani, ‘‘Four-quadrant sensorless brushless ECM drive,’’ in Proc. 6th Annu. Applied Power Electronics Conf. Exposition, Mar. 1991, pp. 202–209.
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28Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
References
[7] S. Ogasawara and H. Akagi, ‘‘An approach to position sensorless drive for brushless dc motors,’’ IEEE Trans. Ind. Applicat., vol. 27, pp. 928–933, Sept./Oct. 1991.
[8] Y. S. Lai, F. S. Shyu, and Y. H. Chang, ‘‘Novel loss reduction pulsewidth modulation technique for brushless dc motor drives fed by MOSFET inverter,’’ IEEE Trans. Power Electron., vol. 19, no. 6, pp. 1646–1656, 2004.
[9] Y. S. Lai, F. S. Shyu, and Y. H. Chang, ‘‘Novel pulse-width modulation technique with loss reduction for small power brushless dc motor drives,’’ in Conf. Rec. IEEE IAS Annu. Meeting, 2002, pp. 2057–2064.
[10] Tokyo Shibaura Electric Co., ‘‘Drive control apparatus for brushless dc motor and driving method therefore,’’ U.S. Patent 5 491 393, 1996.
[11] Y. S. Lai, F. S. Shyu, and Y. K. Lin, ‘‘Novel PWM technique without causing reversal dc-link current for brushless dc motor drives with bootstrap driver,’’ in Conf. Rec. IEEE IAS Annu. Meeting, 2005, pp. 2182–2188.
[12] Y. S. Lai and Y. K. Lin, ‘‘A unified approach to back-EMF detection for brushless dc motor drives without current and Hall sensor,’’ in Proc. IEEE IECON, Nov. 2006, pp. 1293–1298.
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29Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
References
[13] L6385: High-Voltage High and Low Side Driver, ST Microelectronics Datasheet, USA, 1999.
[14] J. T. Strydom, M. A. De Rooij, and J. D. Van Wyk, ‘‘A comparison of fundamental gate-driver topologies for high frequency applications,’’ in Proc. IEEE APEC, 2004, vol. 2. pp. 1045–1052.
[15] S. D. Sudhoff and P. C. Krause, ‘‘Operating modes of the brushless dc motor with a 120 inverter,’’ IEEE Trans. Energy Conversion, vol. 5, no. 3, pp. 558–564, 1990.
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30Department of Electrical Engineering
Southern Taiwan UniversityDepartment of Electrical Engineering
Southern Taiwan University
112/04/19
Robot and Servo Drive Lab.30
Thanks for your listening !