* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download 開啟檔案
Resilient control systems wikipedia , lookup
Electric machine wikipedia , lookup
Electrification wikipedia , lookup
Power over Ethernet wikipedia , lookup
Electrical ballast wikipedia , lookup
Electric motor wikipedia , lookup
Power engineering wikipedia , lookup
Current source wikipedia , lookup
Electrical substation wikipedia , lookup
History of electric power transmission wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Induction motor wikipedia , lookup
Power inverter wikipedia , lookup
Distribution management system wikipedia , lookup
Power MOSFET wikipedia , lookup
Voltage regulator wikipedia , lookup
Surge protector wikipedia , lookup
Three-phase electric power wikipedia , lookup
Switched-mode power supply wikipedia , lookup
Stray voltage wikipedia , lookup
Brushed DC electric motor wikipedia , lookup
Buck converter wikipedia , lookup
Rectiverter wikipedia , lookup
Pulse-width modulation wikipedia , lookup
Power electronics wikipedia , lookup
Alternating current wikipedia , lookup
Opto-isolator wikipedia , lookup
Mains electricity wikipedia , lookup
Stepper motor wikipedia , lookup
Voltage optimisation wikipedia , lookup
Novel Back-EMF Detection Technique of Brushless DC Motor Drives for Wide Range Control Without Using Current and Position Sensors IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 2, p.934~940,MARCH 2008 Yen-Shin Lai, Senior Member, IEEE, and Yong-Kai Lin Adviser : Ming-Shyan Wang Student :Jin-Mu Lin Outline Abstract Introduction PWM control and problem description Proposed technique Experimental results Conclusion Appendix References Abstract 本文提供一個新的反電動勢檢測技術,可以廣範圍的控制。 特點: 1.解決以前只能控制high or low duty的情況。 2.不需要使用任何hall or position sensor=用未激磁相量測到 的端電壓來計算反電動勢的零交越點,產生正確的換相控制。 3.容易使用數位系統來實現=使用FPGA架構來實現BLDC Driver System。 Introduction 與感應馬達比較,優點:沒有轉子側的銅損。 減少BLDC控制成本的做法=無感測器控制。 這些參考論文使用的方式都使用從量測與dc-link串聯 的 “電阻”產生的資料,重建中性點電壓和終端點電壓。 各參考論文提及: So….. 為了解決以上的問題,本論文提出一個新的方式 來計算在高速與低速時的反電動勢的零交越點。 PWM control and problem description The high-side power device is controlled by chopper signal every consecutive 120° in a fundamental period. The associated low-side control signal is shifted by 180° ,as compared to its highside one, to clamp the related inverter output to the negative dc-link rail. Defines the terminal voltages of three-phase windings “ ” denotes the terminal voltage for the phase connected to the positive dc-link rail during PWM control period. “ ” indicates the terminal voltage for the phase connected to the negative dc-link rail. “ ” is the terminal voltage for the floating phase. The back-EMF voltage is detected via the terminal voltage of floating phase. 非激磁相的端電壓公式(1/2) 非激磁相的端電壓公式(2/2) 檢測零交越點在上升、下降的端電壓(1/1) As shown in Fig. 3, the terminal voltage of the floating phase has either rising edge or falling edge. For both, when the terminal voltage becomes zero, the zero-crossing point occurs. 上升邊緣的端電壓 當PWM ON時 未激磁相的端電壓可以用(6)導出寫成 (7) 這情況下的零交越點端電壓 (8) 當PWM OFF時 未激磁相的端電壓就是 (9) Fig.4 下降邊緣的端電壓 當PWM ON時 未激磁相的端電壓可以用(6)導出寫成 (10) 這情況下的零交越點端電壓 (11) 當PWM OFF時 未激磁相的端電壓就是 (12) Fig.4 低工作率控制下的端電壓理想的波形 Proposed technique 計算:零交越點時間點(>50%) V Duty ratio > 50% By (13), the time instant of zero-crossing point can be determined as follows: 計算:零交越點時間點(<50%) Duty ratio < 50% By (15), the time instant of zero-crossing point can be determined as follows: Experimental results Experimental results Duty = 95% Ch1=voltage; Ch2 =current. Experimental results Duty = 95% Ch1 = voltage; commutation signals: Ch2 = by calculation; Ch3 = by Hall sensor. Experimental results Duty = 55% Ch1=voltage; Ch2 =current. Experimental results Duty = 55% Ch1 = voltage; commutation signals: Ch2 = by calculation; Ch3 = by Hall sensor. Experimental results Duty = 45% Ch1=voltage; Ch2 =current. Experimental results Duty = 45% Ch1 = voltage; commutation signals: Ch2 = by calculation; Ch3 = by Hall sensor. Experimental results Duty = 5% Ch1=voltage; Ch2 =current. Experimental results Duty = 5% Ch1 = voltage; commutation signals: Ch2 = by calculation; Ch3 = by Hall sensor. Current waveform from standstill to closed-loop operation. Experimental results, speed versus duty, rated speed = 2500 rpm. Conclusion 1. the duty can be smoothly controlled from 5% to 95%; 2.讓BLDC無感測控制的想法注入新的ideal。 3.Present a novel back-EMF detection technique to provide wide duty-ratio range control for BLDCM drives while not requiring position and current sensors. 4.Confirm the performance of the presented technique derived from an FPGA-based system. APPENDIX MOTOR SPECIFICATIONS 1.No.of poles=8, 2.rated power=70w, 3.Vdc=24v, 4.Rated=2500rpm References 1/2 [1] K. Nishimura, “Sensorless Motor Drives,” US Patent, 6 111 372, 2000,(Rohm Co. Ltd.). [2] W. J. Lee and S. K. Sul, “A new starting method of BLDC motors without position sensor,” in Proc. IAS Annu. Meeting, 2004, pp. 2397–2402. [3] Q. Jiang, C. Bi, and R. Hung, “A new phase-delay-free method to detect back EMF zero-crossing points for sensorless control of spindle motors,” IEEE Trans. Magn., vol. 41, no. 7, pp. 2287–2294, Jul. 2005. [4] G. J. Su and J. W. McKeever, “Low cost sensorless control of brushless dc motors with improved speed range,” IEEE Trans. Power Electron., vol. 19, no. 2, pp. 296–302, Mar. 2004. [5] G. J. Su and J. W.McKeever, “Correction to low-cost sensorless control of brushless dc motors with improved speed range,” IEEE Trans. Power Electron., vol. 19, no. 3, pp. 878–879, May 2004. [6] S. Ogasawara and H. Akagi, “An approach to position sensorless drive for brushless dc motors,” IEEE Trans. Ind. Appl., vol. 27, no. 3, pp.928–933, Sep./Oct. 1991. [7] J. Shao, D. Nolan, and T. Hopkins, “A novel direct back EMF detection for sensorless brushless dc (BLDC) motor drives,” Proc. IEEE APEC, pp. 33–37, 2002. [8] SGS-Thomson Microelectronics (Assignee), “Control of a Brushless Motor,” U.S. Patent 5 859 520, 1999. [9] J. Shao, D. Nolan, M. Teissier, and D. Swanson, “A novel microcontroller-based sensorless brushless dc (BLDC) motor drive for automotivefuel pumps,” IEEE Trans. Ind. Appl., vol. 39, no. 6, pp. 1734–1740,Dec. 2003. References 2/2 [10] J. Shao, D. Nolan, and T. Hopkins, “Improved direct back EMF detection for sensorless brushless dc (BLDC) motor drives,” Proc. IEEE APEC, pp. 300–305, 2003. [11] Y. S. Lai, F. S. Shyu, and Y. S. Chang, “Novel sensorless PWM-controlledBLDCM drives without using position and current sensors, filter and center-tap voltage,” Proc. IEEE IECON, pp. 2144–2149, 2003. [12] Y. S. Lai, F. S. Shyu, and W. H. Rao, “Novel back-EMF detection technique of brushless dc motor drives for whole duty-ratio range control,” in Proc. IEEE IECON Conf., 2004, pp. 2729–2732. [13] J. Shao, “An improved microcontroller-based sensorless brushless dc (BLDC) motor drive for automotive applications,” in Proc. IAS Annu. Meeting, 2005, pp. 2512–2517. [14] Y. Kang, S. B. Lee, and J. Yoo, “A microcontroller embedded AD converter based low cost sensorless technique for brushless dc motor drives,” in Proc. IAS Annu. Meeting, 2005, pp. 2176–2181. [15] Seiko Epson Corp., “Brushless dc Motor Without Position Sensor and Its Controller,” E.P. Patent 0 553 354 B1, 1993. [16] Tokyo Shibaura Electric Co., “Inverter and Air Conditioner Controlled by the Same,” U.S. Patent 5 486 743, 1996. [17] STMicroelectronics, “Control of a Brushless Motor,” U.S. Patent 5 859 520, 1999. [18] Y. S. Lai and Y. K. Lin, “Assessment of pulse-width modulation techniques for brushless dc motor drives,” in Proc. IEEE IAS Annu. Meeting, Oct. 2006, pp. 1629–1636. [19] Y. S. Lai, F. S. Shyu, and Y. H. Chang, “Novel loss reduction pulse-width modulation technique for brushless dc motor drives fed by MOSFET inverter,” IEEE Trans. Power Electron., vol. 19, no. 6,pp. 1646–1652, Nov. 2004. Thanks for listening!!!