Extracting DC bus current information for optimal phase correction and current ripple in sensorless brushless DC motor drive
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Brushless DC motor (BLDCM) sensorless driving technology is becoming increasingly established. However, optimal phase correction still relies on complex calculations or algorithms. In finding the correct commutation point, the problem of phase lag is introduced. In this paper, we extract DC bus current information for auto-calibrating the phase shift to obtain the correct commutation point and optimize the control of BLDC sensorless driving. As we capture only DC bus current information, the original shunt resistor is used in the BLDCM driver and there is no need to add further current sensor components. Software processing using only simple arithmetic operations successfully accomplishes the phase correction. Experimental results show that the proposed method can operate accurately and stably at low or high speed, with light or heavy load, and is suitable for practical applications. This approach will not increase cost but will achieve the best performance/cost ratio and meet market expectations.
Key wordsBrushless motors Electric motors Motor drives Phase control Phase estimation Sensorless control
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- Chuang, H.S., Ke, Y.L., Chuang, Y.C., 2009. Analysis of commutation torque ripple using different PWM modes in BLDC motors. IEEE Industrial Commercial Power System Technical Conf., p.1–6. [doi:10.1109/ICPS.2009.5463966]Google Scholar
- Ho, Z.S., Uang, C.M., Wang, P.C., 2013. Full speed range senesorless circuit for BLDC motor driver. Electronic Technology Symp. Conf., p.519–522.Google Scholar
- Kim, T.H., Ehsani, M., 2003. An error analysis of the sensorless position estimation for BLDC motors. IEEE Industry Applications Conf. 38th IAS Annual Meeting, p.611–617. [doi:10.1109/IAS.2003.1257564]Google Scholar
- Salah, W.A., Ishak, D., Hammadi, K.J., 2011. Minimization of torque ripples in BLDC motors due to phase commutation—a review. Przeglad Elektrotechniczny, 87:182–188.Google Scholar
- Shen, J.X., Tseng, K.J., 2003. Analyses and compensation of rotor position detection error in sensorless PM brushless DC motor drives. IEEE Trans. Energy Conv., 18(1):87–93. [doi:10.1109/TEC.2002.808339]Google Scholar
- Uang, C.M., Ho, Z.S., Wang, P.C., et al., 2011. Sensorless position optimal control strategy of brushless DC motor. IEEE 9th Int. Conf. on Power Electronics and Drive Systems, p.653–658. [doi:10.1109/PEDS.2011.6147321]Google Scholar