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Robot and Servo Drive Lab. Assessing pulse-width modulation techniques for brushless dc motor drives BY YEN-SHIN LAI & YONG-KAI LIN IEEE INDUSTRY APPLICATIONS MAGAZINE ∙SEPT j OCT 2008 ∙ WWW. IEEE.ORG/IAS pp34-44. Student: Tai-Rong Lai PPT製作率:100% Professor: Ming-Shyan Wang Department of Electrical Engineering Southern Taiwan University 2016/7/16 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 2016/7/16 2 Department of Electrical Engineering Southern Taiwan University Robot and Servo Drive Lab. 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 3 Department of Electrical Engineering Southern Taiwan University PWM techniques for BLDCM Drive 4 Department of Electrical Engineering Southern Taiwan University PWM techniques for BLDCM Drive 5 Department of Electrical Engineering Southern Taiwan University PWM techniques for BLDCM Drive 6 Department of Electrical Engineering Southern Taiwan University Driver Circuit Photocoupler driver Isolated transformer driver Bootstrap driver 7 Department of Electrical Engineering Southern Taiwan University Photocoupler driver 8 Department of Electrical Engineering Southern Taiwan University Isolated transformer driver 9 Department of Electrical Engineering Southern Taiwan University Bootstrap driver 10 Department of Electrical Engineering Southern Taiwan University Driver Circuit 11 Department of Electrical Engineering Southern Taiwan University Reversal dc-Link Current CH1:chopper CH2:Vu CH3:Iu CH4:Idc 12 Department of Electrical Engineering Southern Taiwan University Reversal dc-link current, phase U 13 Department of Electrical Engineering Southern Taiwan University Circulating Current of Floating Phase 14 Department of Electrical Engineering Southern Taiwan University Circulating Current of Floating Phase 15 Department 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. 16 Department of Electrical Engineering Southern Taiwan University Back EMF Detection 17 Department of Electrical Engineering Southern Taiwan University Assessment of PWM Techniques—Theoretical Analysis and Experimental Confirmation Block diagram of the sensorless experimental system 18 Department of Electrical Engineering Southern Taiwan University Motor specifications Number of poles=8 Rated power=70W V dc= 24 V Rated speed=2,500 rpm 19 Department of Electrical Engineering Southern Taiwan University CH1: high-side control, CH2: low-side control, CH3: terminal voltage CH4: phase current, duty = 20%. 20 Department of Electrical Engineering Southern Taiwan University CH1: high-side control, CH2: low-side control, CH3: terminal voltage CH4: phase current, duty = 80%. 21 Department of Electrical Engineering Southern Taiwan University CH1: high-side control, CH2: low-side control, CH3: terminal voltage CH4: dc-link current, duty = 20%. 22 Department of Electrical Engineering Southern Taiwan University CH1: high-side control, CH2: low-side control, CH3: terminal voltage CH4: dc-link current, duty = 80%. 23 Department of Electrical Engineering Southern Taiwan University CH1: terminal voltage CH2: phase current, duty = 80%. No load 24 Department of Electrical Engineering Southern Taiwan University 25 Department 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. 26 Department 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. 27 Department 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. Department of Electrical Engineering Southern Taiwan University 28 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. 29 Department of Electrical Engineering Southern Taiwan University Thanks for your listening ！ 2016/7/16 30 Department of Electrical Engineering Southern Taiwan University Robot and Servo Drive Lab.