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Sensorless Drive of Brushless DC Motors Using an Unknown Input Observer  

Ryu, Ji-Su (한양대 대학원 전기공학과)
Hyun, Dong-Seok (한양대 전기제어생체공학부)
Kim, Tae-Sung (한양대 대학원 전기공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.11, no.1, 2006 , pp. 65-71 More about this Journal
Abstract
In this paper, a novel motor control method is proposed to improve the performance of sensorless drive of BLDC motors. In the terminal voltage sensing method, which is a great portion of sensorless control, a precise rotor position cannot be obtained when excessive input is applied to the drive during synchronous operation mode. Especially in the transient state, the response characteristic decreases. To cope with this problem, the unknown input (back-EMF) is modelled as the additional state of system in this paper. Taking into account the disturbance adopted by the back-EMF, the observer can be obtained by the augmented system equation. An algorithm to detect the back-EMF of the BLDC motor using the state observer is constructed. As a result, the novel sensorless drive of BLDC motors that can strictly estimate rotor position and speed is proposed.
Keywords
BLDC Motor; Sensorless; Unknown Input Observer;
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  • Reference
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