An Accurate Automatic Phase Advance Adjustment of Brushless DC Motor

• Published in: IEEE transactions on magnetics Vol. 45; no. 1; pp. 120 - 126
• Main Authors: CHIU, Chun-Lung, CHEN, Yie-Tone, SHEN, Yu-Hsiang, LIANG, Ruey-Hsun
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.01.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Automatic phase advance adjustment; Brushless DC motors; Brushless motors; Circuits; Commutation; Cross-disciplinary physics: materials science; rheology; DC motors; Electric motors; Exact sciences and technology; Fans; Frequency; Halls; Harmonics; Induced voltage; Magnetism; Materials science; Motors; Other topics in materials science; Physics; Sensors; single-phase BLDC motor; Torque; Voltage; single-phase BLDC motor; Automatic phase advance adjustment; Magnetic properties
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2008.2002690

For improved efficiency and torque performance, brushless DC (BLDC) motors require a phase advance circuit. In a conventional phase advance circuit, the induced voltage of the Hall sensor is assumed to be a sinusoidal wave. But the actual induced voltage of the Hall sensor includes other harmonic components which influence the real phase advance angle. Performance curves of phase advance angle versus frequency for a conventional circuit do not work well when the harmonic components are considered. We therefore propose an improved circuit in which the phase advance angle is more accurate than that of a conventional circuit when the harmonic components are considered. Furthermore, the proposed circuit provides better performance. We present experimental results to verify the related theoretical analysis.