assessing pulse-width modulation techniques for brushless dc motor drives

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.

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




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




Driver Circuit

Photocoupler driver

Isolated transformer driver

Bootstrap driver




Photocoupler driver




Isolated transformer driver




Bootstrap driver




Driver Circuit




Reversal dc-Link Current

CH1:chopper CH2:Vu CH3:Iu CH4:Idc




Reversal dc-link current, phase U




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.




Back EMF Detection




Assessment of PWM Techniques—Theoretical Analysis and Experimental Confirmation

Block diagram of the sensorless experimental system




Motor specifications

Number of poles=8 Rated power=70W V dc= 24 V Rated speed=2,500 rpm




CH1: high-side control, CH2: low-side control, CH3: terminal voltageCH4: phase current, duty = 20%.




CH1: high-side control, CH2: low-side control, CH3: terminal voltageCH4: phase current, duty = 80%.




CH1: high-side control, CH2: low-side control, CH3: terminal voltageCH4: dc-link current, duty = 20%.




CH1: high-side control, CH2: low-side control, CH3: terminal voltageCH4: dc-link current, duty = 80%.




CH1: terminal voltageCH2: phase current, duty = 80%.No load




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.




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.




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.




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.




112/04/19

Robot and Servo Drive Lab.30

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assessing pulse-width modulation techniques for brushless dc motor drives

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