Sensorless Control of BLDCM Based on Improved Sliding Mode Observer
[1]Bai Guochang,Yao Jiliang.Sensorless Control of BLDCM Based on Improved Sliding Mode Observer[J].Journal of Zhengzhou University (Engineering Science),2020,41(02):25-31.[doi:10.13705/j.issn.1671-6833.2020.03.014]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
41
Number of periods:
2020 02
Page number:
25-31
Column:
Public date:
2020-05-31
- Title:
- Sensorless Control of BLDCM Based on Improved Sliding Mode Observer
- Keywords:
- Brushless DC motor; Sensorless control; Improved sliding mode observer; system chattering; sigmoid function; Variable sliding mode gain
- CLC:
- -
- DOI:
- 10.13705/j.issn.1671-6833.2020.03.014
- Abstract:
- When the traditional sliding mode observer was used to observe the line back electromotive force( line back-EMF) of brushless dc motor ( BLDCM), a low-pass filter was required because of the excessivechattering of the system. However, the phase delay caused by the filter could not be accurately compensated ,resulting in inaccurate commutation. This paper proposed to apply the sigmoid function to the sliding modeobserver, and used its smooth and continuous characteristics to reduce chattering. At the same time, a variablesliding mode gain was deduced to further weaken the chattering of the system based on the Lyapunov theorem.Through these measures, the line back-EMF observations observed could directly determine the commutationsignal. The simulation and experimental results showed that the improved sliding mode observer reduced thepeak value of line back-EMF observation errors at 400 r/ min and 3 000 r/min by 70% and 54. 8% respective-ly, obtained more accurate commutation signals, and improved the brushless de motor positionless control sys-tem performance.
- References:
- -
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Last Update:
2020-05-30