Intelligent Control Methods for Sensor Less Control of BLDC Motor Drive used in High Speed Applications

Surender Dhanasekaran, Nandineravanda Bheemaiah


Brushless dc (BLDC) motors and their drives are penetrating the market of home appliances, HVAC industry, and automotive applications in recent years because of their high efficiency, silent operation, compact form, reliability, and low maintenance. Traditionally, BLDC motors are commutated in six-step pattern with commutation controlled by position sensors. To reduce cost and complexity of the drive system, sensorless drive is preferred. In this paper, a fuzzy logic controller(FLC) for sensorless brushless dc (BLDC) motor. The proposedFLC is based on the terminal voltage measurement as thesensorless method for BLDC motor control. There are twomodules designed in the speed control of BLDC motor, i.e.command and regulating modules. Command module is to findand issue commutation period and PWM duty cycle to the BLDCmotor for desired speed. The regulating module is designed byapplying a FLC with sensorless technology and is used toregulate the speed of BLDC motor under various disturbances,such as loading effect. A new scheme is proposed for sensor-less control of PMBLDC motor for aligning its rotor at a known position.


Back EMF; PMBLDC motor; position sensor-less, fuzzy logic controller (FLC).

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Thomas Kaporch, “Driving the future,“ Appliance Manufacture, Sept.2001, pp43- 46.

Joe Mattingly, “More Efficiency Standards on Horizon,” Appliance Manufacture, Oct.2001, Published on Internet.

J.Filla, “ECMs Move into HVAC,” Appliance Manufacture, Mar.2002, pp25-27.

J.Jancsurak, “Motoring into DSPs,” Appliance Manufacture, Sept.2000, pp57-60.

T.J.E. Miller, “ Brushless Permanent-Magnet and Reluctant Motor Drives,” Oxford, 1989.

K.Rajashekara, A.Kawamura, et al, “Sensorless Control of AC Motor Drivers,” IEEE press, 1996.

US Patent No.4654566, “ Control system, method of operating an electronically commutated motor, and laundering apparatus,” granted to GE.

K.Uzuka, H.Uzuhashi, et al., “Microcomputer Control for Sensorless Brushless Motor, ” IEEE Trans. Industry Application, vol.IA-21, May-June, 1985.

. R.Becerra, T.Jahns, and M.Ehsani, “Four Quadrant Sensorless Brushless ECM Drive,” IEEE Applied Power Electronics Conference and Exposition 1991, pp.202- 209.

J. S. Kim, and S. K. Sul, “New approach for high-performance PMSM drives without rotational position sensors,” IEEE Trans. Power Electronics, Vol. 12, pp. 904-911, Sep. 1997.

Y. Kang, S. B. Lee, and J. Yoo, “A microcontroller embedded AD converter based low coast sensorless technique for brushless dc motor drives,” IEEE Conf. Industry Applications, Vol. 3, pp. 2176-2181, Oct. 2005.

J. Shao, D. Nolan, and T. Hopkins, “A novel direct back EMF detection for sensorless brushless dc (BLDC) motor drives,” IEEE Conf. Digital Object Identifier, Vol. 1, pp. 33-37, Mar. 2002.

C. G. Kim, J. H. Lee, H. W. Kim, and M. J. Youn, “Study on maximum torque generation for sensorless controlled brushless dc motor with trapezoidal back EMF,” IEE Proceedings of Electric Power Applications, Vol.152, Issue 2, pp. 277-291, Mar. 2005.

R.-L. Lin, M.-T. Hu, S.-C. Chen, and C.-Y. Lee, “Using phase-current sensing circuit as the position sensor for brushless DC motors without shaft position sensor,” IEEE Conf. Digital Object Identifier, Vol. 1, pp. 215-218, Nov. 1989.

C. G. Chen, T. H. Liu, M. T. Lin, and C. A. Tai, “Position control of a sensorless synchronous reluctance motor,” IEEE Trans. Digital Object Identifier, Vol. 51, Issue 1, pp. 15-25, Feb. 2004.

S. Ogasawara, and H. Akagi, “An approach to position sensorless drive for brushless DC motors,” IEEE Trans. Digital Object Identifier, Vol. 27, Issue 5, pp. 928-933, Sept.-Oct. 1991.

H. P. Wang, and Y. T. Liu, “Integrated design of speed-sensorless and adaptive speed controller for a brushless DC motor,” IEEE Trans. Power Electronics, Vol. 21, pp. 518-523, Mar. 2006.

M. Naidu, T. W. Nehl, S. Gopalakrishnan and L. Wurth, “Keeping cool while saving space and money: a semi-integrated, sensorless PM brushless drive for a 42-V automotive HVAC compressor”, IEEE Ind.Appl. Mag.,Vol. 11, No. 4, pp. 20-28, Jul.-Aug., 2005.

H. Hao, X. Guoqing, and H. Bo, “A new start method for sensorless brushless dc motor based on pulse injection,” Power and EnergyEngineering Conference, 2009. APPEEC 2009. Asia-Pacific, pp.1-5.


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