Online from: 1982
Subject Area: Electrical & Electronic Engineering
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|Title:||Sensorless high-speed BLDC machine using hardware-RFO|
|Author(s):||Jian-Xin Shen, (College of Electrical Engineering, Zhejiang University, Hangzhou, China), He Hao, (College of Electrical Engineering, Zhejiang University, Hangzhou, China), Meng-Jia Jin, (College of Electrical Engineering, Zhejiang University, Hangzhou, China), Wei-Zhong Fei, (Department of Engineering Systems and Management, Cranfield University, Swindon, UK)|
|Citation:||Jian-Xin Shen, He Hao, Meng-Jia Jin, Wei-Zhong Fei, (2012) "Sensorless high-speed BLDC machine using hardware-RFO", COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, Vol. 31 Iss: 1, pp.182 - 190|
|Keywords:||Brushless DC motor, Electric motors, Flux observer, High-speed operation, Magnetic devices, Sensorless control|
|Article type:||Research paper|
|DOI:||10.1108/03321641211184904 (Permanent URL)|
|Publisher:||Emerald Group Publishing Limited|
|Acknowledgements:||This work was supported by Natural Science Foundation of China (NSFC-51077116), China 973 Program (2011CB707204), and Zijin Program of Zhejiang University (188020-544802).|
Purpose – The purpose is to present a sensorless control method by which high-resolution rotor position information is estimated and used for phase-advancing operation of a high-speed permanent magnet (PM) brushless DC (BLDC) motor.
Design/methodology/approach – The proposed sensorless control approach uses hardware to observe the flux vector which is excited by rotor magnets. It can provide the rotor position which is the same as the phase angle of the observed flux vector.
Findings – High-resolution rotor position signal of the BLDC motor for dynamic phase-advancing control cannot be directly obtained from the conventional Hall-effect sensors, or via the traditional back-EMF-based sensorless control strategies in which the back-EMF may be even undetectable at high-speed. The proposed rotor-flux-observer (RFO)-based sensorless control method overcomes these problems, and meanwhile provides high-resolution rotor position information for the phase-advancing purpose.
Originality/value – The RFO-based sensorless control is traditionally applied to PM brushless ac (BLAC) operations, where the motor voltage vector can be calculated from the inverter switching status. However, this is not readily applicable to a BLDC motor since the voltage of the floating phase cannot be calculated. Moreover, during high-speed operation, the microprocessor may not be sufficiently fast to calculate the high-resolution rotor position. Therefore, in this paper, it is proposed to use hardware to observe the rotor-flux-vector. The microprocessor only samples the vector's a- and ß-components and calculates the phase angle, hence, its burden is low. The proposed method is validated with a 1.8?kW 85,000?rpm BLDC motor system.
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