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New sensorless control for brushless DC motors using disturbance observers and adaptive velocity estimations

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4 Author(s)
M. Tomita ; Dept. of Electr. Eng., Nagoya Univ., Japan ; T. Senjyu ; S. Doki ; S. Okuma

A brushless DC motor has been represented by a nonlinear equation. Therefore, it has been difficult to apply linear control theory to brushless DC motor systems. In this paper, to apply the linear control theory to brushless DC motor systems, the authors propose considering the nonlinear term of the equation as a disturbance and to realize a sensorless control of the brushless DC motor using both the disturbance observer and the adaptive velocity estimation. With proper pole locations of the disturbance observer, stability of the position estimation is guaranteed, and stability of the adaptive velocity estimation is also guaranteed by Popov's hyperstability theory. The experimental results show that the proposed method is very useful

Published in:

IEEE Transactions on Industrial Electronics  (Volume:45 ,  Issue: 2 )