Research on the Speed Sliding Mode Observation Method of a Bearingless Induction Motor

Youpeng Chen, Wenshao Bu and Yanke Qiao
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Youpeng Chen: Information Engineering College, Henan University of Science and Technology, Luoyang 471023, China
Wenshao Bu: Electrical Engineering College, Henan University of Science and Technology, Luoyang 471023, China
Yanke Qiao: Luoyang Mining Machinery Engineering Design Institute, Luoyang 471039, China

Energies, 2021, vol. 14, issue 4, 1-18

Abstract: In order to achieve the speed sensorless control of a bearingless induction motor (BL-IM), a novel sliding mode observation (SMO) method of motor speed is researched. First of all, according to the mathematical model of a BL-IM system, the observation model of stator current and that of rotor flux-linkage are derived. In order to overcome the chattering problem of a sliding mode observer, a continuous saturation function is adopted to replace the traditional sign function. Then, the SMO model of motor speed is derived, and the stability of the proposed motor speed SMO method is validated by the Lyapunov stability theory. At the end, the observed motor speed and rotor flux-linkage are applied to a BL-IM inverse “dynamic decoupling control” (DDC) system. Simulation results show that the real-time observation or dynamic tracking of motor speed and rotor flux-linkage are achieved in a more timely manner and more accurately, and higher steady-state observation accuracy is obtained; the proposed SMO method can be used in the BL-IM’s inverse DDC system to realize reliable magnetic suspension operation control without a speed sensor.

Keywords: bearingless induction motor; sliding mode observation; dynamic decoupling based on inverse system; motor speed observer; current and flux-linkage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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