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Commutation point estimation for sensorless brushless DC motor using back-electromagnetic force change rate by least-square method
- Authors
- Kim, Joonhong; Kim, Sun-Kyu; Lim, Jung-Hwan
- Issue Date
- Jan-2015
- Publisher
- INST ENGINEERING TECHNOLOGY-IET
- Keywords
- LC circuits; circuit tuning; Q-factor; circuit complexity; automatic LC network tuner; negative resistances; inductor-capacitor network; receiving signal frequency; negative resistor; quality factor; LC circuit; voltage detector decision range; low complexity algorithms; radiofrequency identification tags; production line testing; input signals
- Citation
- ELECTRONICS LETTERS, v.51, no.1, pp.31 - U61
- Indexed
- SCIE
SCOPUS
- Journal Title
- ELECTRONICS LETTERS
- Volume
- 51
- Number
- 1
- Start Page
- 31
- End Page
- U61
- ISSN
- 0013-5194
- Abstract
- A new commutation point (CP) estimation method for a high-speed sensorless brushless motor using the back-electromagnetic force (EMF) change rate is proposed. Typical CP estimation methods may not work correctly either at high speed when the number of sampled data is not enough or at low speed when the back-EMF voltage is weak. In the proposed method, the back-EMF voltages are measured using an analogue-to-digital converter. The back-EMF voltage change rate is calculated from the measured values and utilised to estimate the CP by employing the least-square method. The experimental results show that the proposed estimation method works correctly over a wide speed-range operation.
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