1. Department of Electrical Engineering Southern Taiwan University of Science and Technology Robot and Servo Drive Lab. 學生 : 蔡景棠 指導教授 : 王明賢 2015/10/13 A Driver for the Single-Phase Brushless DC Fan Motor With Hybrid Winding Structure Yie-Tone Chen, Member, IEEE, Chun-Lung Chiu, Yi-Ruey Jhang, Zong-Hong Tang, and Ruey-Hsun Liang, Member, IEEE IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 60, NO. 10,OCTOBER 2013 p4369-4375

2. Department of Electrical Engineering Southern Taiwan University of Science and Technology Outline Abstract Definition of The Symbol and Winding Direction of The Motor Stator Proposed Inverter Driver Circuit for BLDC Motor With Hybrid Winding Experiments Conclusion References 2015/10/13 Robot and Servo Drive Lab. 2

3. Department of Electrical Engineering Southern Taiwan University of Science and Technology Abstract This paper mainly proposes a novel driver for a single-phase brushless dc fan motor with a hybrid series/parallel winding structure. An adequate inverter driving circuit, which is capable to simultaneously obtain the advantages of the hybrid structure, is also discussed. At last, the overall system of this hybrid brushless dc motor with the proposed driving circuit is then implemented to verify the performance of the proposed driver and structure. 2015/10/13 Robot and Servo Drive Lab. 3

4. Department of Electrical Engineering Southern Taiwan University of Science and Technology Definition of The Symbol and Winding Direction of The Motor Stator Winding directions of the motor stator. (a) CCW direction. (b) CW direction 2015/10/13 Robot and Servo Drive Lab. 4

5. Department of Electrical Engineering Southern Taiwan University of Science and Technology Commonly used windings. (a) Series winding. (b) Parallel winding 2015/10/13 Robot and Servo Drive Lab. 5

6. Department of Electrical Engineering Southern Taiwan University of Science and Technology Illustration of the hybrid winding 2015/10/13 Robot and Servo Drive Lab. 6

7. Department of Electrical Engineering Southern Taiwan University of Science and Technology Electrical Characteristics of the Motor With Hybrid Series/Parallel Winding We can understand that the back-EMF voltage of the series winding is about double the amount of the parallel winding at the same speed. Then, from P out = V EMF · I = T m · ω, the current relationship for the same fan style with the series and parallel windings at the same operational speed can be written as I p = 2I s. 2015/10/13 Robot and Servo Drive Lab. 7

8. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 8 V s :the input voltage of series winding V p :the input voltage of parallel winding V EMFs = 2V EMFp I s = ½ I p

9. Department of Electrical Engineering Southern Taiwan University of Science and Technology Proposed Inverter Driver Circuit For BLDC Motor With Hybrid Winding The motor will operate at series mode while the switches (S5 and S6) are closed to state “1” and it will operate at parallel mode while S5 and S6 are switched to state “2.” 2015/10/13 Robot and Servo Drive Lab. 9 Figure. Symbolic driving system for hybrid winding

10. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 10 Figure. Proposed driving circuit Figure. Symbolic driving system for hybrid winding

11. Department of Electrical Engineering Southern Taiwan University of Science and Technology Figure. Illustration of the control strategy. 2015/10/13 Robot and Servo Drive Lab. 11

12. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 12 Series Mode when the SW signal is high, Q9 and Q10 are turned on, and Q5, Q6, Q7, and Q8 will be shut down at the same time. Parallel Mode when the SW signal is low, Q9 and Q10 are turned off, and Q5, Q6, Q7, and Q8 will be released at the same time.

13. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 13 Mode Selection Timing the mode selection point is at one of the midspeed regions that is defined by the capability of the highest speed of the series winding.

14. Department of Electrical Engineering Southern Taiwan University of Science and Technology Experiments 2015/10/13 Robot and Servo Drive Lab. 14 Figure. Top and back sides of real motor stator with hybrid winding.

15. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 15

16. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 16 Measurement of the back-EMF voltage at a speed of 3600 r/min. (a)Series winding. (b) Parallel winding.

17. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 17 Measurements of the winding current at a speed of 3600 r/min. (a)Series winding. (b) Parallel winding.

18. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 18 Measured relationship between the input voltage and speed. the average input voltage of the series winding is about double that of the parallel winding. V s =2V p

19. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 19 Figure. Measured consuming power of the series and parallel windings.

20. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 20 Figure. Enlarged part of consuming power below 3600 r/min.

21. Department of Electrical Engineering Southern Taiwan University of Science and Technology 2015/10/13 Robot and Servo Drive Lab. 21 Figure. Ideal curve of the consuming power versus r/min using the proposed compound fan motor.

22. Department of Electrical Engineering Southern Taiwan University of Science and Technology Conclusion According to the analysis of this paper, the series winding method has less power dissipation than the parallel winding method at the same operational speed of the fan. After the compound of the hybrid winding and the adequate inverter circuit, the proposed single-phase BLDC fan motor driver system can obtain better performance than those motors with a series or parallel winding singly. 2015/10/13 Robot and Servo Drive Lab. 22

23. Department of Electrical Engineering Southern Taiwan University of Science and Technology References [1] C.-L. Chiu, Y. T. Chen, Y.-L. Liang, and R.-H. Liang, “Optimal driving efficiency design for the single-phase brushless dc fan motor,” IEEETrans. Magn., vol. 46, no. 4, pp. 1123–1130, Apr. 2010. [2] 何俊良, “ 直流無刷風扇馬達之效率改善, ” 機械工程系碩士學位論文, 國立台灣科技大學,100 年 2 月 28 日. 2015/10/13 Robot and Servo Drive Lab. 23