department of electrical engineering, southern taiwan university 1 a novel starting method of the...

Department of Electrical Engineering, Southern Taiwan University

Department of Electrical Engineering, Southern Taiwan University

1

A Novel Starting Method of the SurfacePermanent-Magnet BLDC Motors Without

Position Sensor for Reciprocating Compressor

A Novel Starting Method of the SurfacePermanent-Magnet BLDC Motors Without

Position Sensor for Reciprocating Compressor

Student: Hsin-Feng Tu Professor: Ming-Shyan WangDate : Dec,24,2010

Kwang-Woon Lee, Dae-Kyong Kim, Byung-Taek Kim, and Byung-Il Kwon, Member, IEEE, IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS, VOL. 44, NO. 1,

JANUARY/FEBRUARY 2008

2Department of Electrical Engineering, Southern Taiwan UniversityDepartment of Electrical Engineering, Southern Taiwan University

Outline

Abstract Introduction Sensorless Control Of The BLDC Motor Starting Sequence Of Sensorless BLDC Motor Control For

Reciprocating Compressor Proposed Starting Method Simulation And Experimental Results Conclusion References


Abstract

This paper describes a new position sensorless starting method, prevent demagnetization of permanent magnet and vibrations due to pulsating currents during the starting period.

The proposed method limits the motor currents during the starting period to lower than the demagnetization currents by doing commutation.

The proposed method limits the motor currents during the starting period to lower than the demagnetization currents by doing commutation depending on the level of the measured phase currents.


Introduction

DURING the last decades, energy saving has been one of the important issues in home appliances.

sensorless control method based on the detection of zero crossing point (ZCP) of back-electromotive force (EMF) has been widely used for low-cost.

The rotor position during the starting period can be obtained by using inductance variation in the case of interior permanent magnet (IPM) type machines.


Sensorless Control Of The BLDC Motor

Fig. 1. Current, back-EMF, and torque waveforms of the BLDC motor.



Fig. 2. (a) Configuration of a BLDC motor drive



Fig. 3. (b) Switching pattern



Fig. 4. (c) terminal voltage sensing circuit



Fig. 5. (d) terminal voltage waveforms


Starting Sequence Of Sensorless BLDC Motor Control For Reciprocating Compressor

Fig. 6. Configuration of a refrigerator


Starting Sequence Of Sensorless BLDC Motor Control For Reciprocating

Compressor

Fig. 7. Conventional startup sequence of a BLDC motor-driven reciprocatingcompressor


Starting Sequence Of Sensorless BLDC Motor Control For Reciprocating

Compressor

Fig. 8. Experimental results on the irreversible demagnetization level of theused SPM-type BLDC motor with ferrite magnet


Proposed Starting Method

Fig. 9. Current waveforms as the relation of the rotor position and the commutationpoint

proper commutation

lagged commutation

leaded commutation



Fig. 10. Relation of the average current (TH) and overcurrent value (TH_over)



Fig. 11. Flowchart of the proposed

starting method.


Simulation And Experimental Results

Fig. 12. Simulation results of the conventional starting method



Fig. 13. Simulation results of the proposed starting method



Fig. 14. Simulation results of the proposed starting method with 10[%] variationof the back-EMF constant



Fig. 15. Experimental test bed



Fig. 16. Starting current waveforms at 0 kgf/cm2 pressure difference betweenthe suction and the discharge port of the compressor.

(a) Conventional method (b) Proposed method.



Fig. 17. Starting current waveforms at 3.0 kgf/cm2 pressure difference between

the suction and the discharge port of the compressor. (a) Conventionalmethod. (b) Proposed method



Fig. 18. Starting current waveforms of the conventional method at 3.5 kgf/cm2pressure difference between the suction and the discharge port of the compressor



Fig. 19. Level of peak current at vibration. (a) Peak current. (b) Peak vibrationmeasured at the compressor


CONCLUSION

The experimental test of irreversible demagnetization was performed to obtain the irreversible demagnetization level of the BLDC reciprocating compressor when peak current is applied.

The proposed method makes possible home appliances using the BLDC motor, such as the refrigerator and the air conditioner, to obtain good performance.


References

[1] K. Iizuka, H. Uzuhashi, M. Kano, T. Endo, K. Mohri, “Microcomputercontrol for sensorless brushless motor,” IEEE Trans. Ind. Appl., vol. IA-21, no. 3, pp. 595–601, May 1985.[2] N. Ertugrul and P. Acarnley, “A new algorithm for sensorless operation of permanent magnet motors,” IEEE Trans. Ind. Appl., vol. 30, no. 1, pp. 126–133, Jan./Feb. 1994.[3] R. C. Becerra, T. M. Jahns, and M. Ehsani, “Four-quadrant sensorless brushless ECM drive,” in Proc. IEEE Appl. Power Electron. Conf. Expo., Mar. 1991, pp. 202–209.[4] S. Ogasawara and H. Akagi, “An approach to position sensorless drive for brushless DC motors,” IEEE Trans. Ind. Appl., vol. 27, no. 5, pp. 928–933.[5] J. P. Johanson, M. Ehsani, and Y. Guzelgunler, “Review of sensorless methods for brushless DC,” in Proc. IEEE IAS Conf., Oct. 1999, vol. 1,pp. 143–150.[6] D.-K. Kim, K.-W. Lee, and B.-I. Kwon, “Torque ripple reduction method in a sensorless drive for the BLDC motor,” KIEE Int. Trans. EMECS, vol. 4-B, no. 4, pp. 196–200, 2004.


References[7] D.-K. Kim, K.-W. Lee, and B.-I. Kwon, “Commutation torque ripple reduction in a position sensorless brushless DCmotor drive,” IEEE Trans. Power Electron., vol. 21, no. 6, pp. 1762–1768, Nov. 2006.[8] M. Schroedl, “An Improved position estimation for sensorless controller permanent magnet synchronous motor,” in Proc. EPE Conf. Rec., 1991, pp. 418–423.[9] K.-Y. Cho, “Sensorless control for a PM synchronous motor in a single piston rotary compressor,” J. Power Electron., vol. 6, no. 1, pp. 29–37, Jan. 2006.[10] G. H. Jang, J. H. Park, and J. H. Chang, “Position detection and start-up algorithm of a rotor in a sensorless BLDC motor utilizing inductance variation,” in Proc. Inst. Elect. Eng. Elect. Power Appl., vol. 149, no. 2, pp. 137–142, 2002.[11] Microlinear Corporation, “Position detection for a brushless dc motor,” U.S. Patent 5001405, San Jose, CA, 1991.[12] B.-J. Brunsbach, G. Henneberger, and Th. Klepsch, “Position controlled permanent magnet excited synchronous motor without mechanical Sensors,” Proc. Inst. Elect. Eng. Conf. Power Electron. Appl., vol. 6, pp. 38– 43, Sep. 1993.[13] S.-C. Yoon and J.-M. Kim, “Sensorless control of a PMSM at low speeds using high frequency voltage injection,” J. Power Electron., vol. 5, no. 1, pp. 11–19, Jan. 2005.[14] G.-H. Kang, J.-P. Hang, G.-T. Kim, and J.-W. Park, “Improved parameters modeling of interior permanent magnet synchronous motor by finite element analysis,” IEEE Trans. Magn., vol. 36, no. 4, pp. 1867–1870, Jul. 2000.


References

[13] S.-C. Yoon and J.-M. Kim, “Sensorless control of a PMSM at low speeds using high frequency voltage injection,” J. Power Electron., vol. 5, no. 1, pp. 11–19, Jan. 2005.

[14] G.-H. Kang, J.-P. Hang, G.-T. Kim, and J.-W. Park, “Improved parameters modeling of interior permanent magnet synchronous motor by finite element analysis,” IEEE Trans. Magn., vol. 36, no. 4, pp. 1867–1870, Jul. 2000.


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