High‐performance PMSM self‐tuning speed control system with a low‐order adaptive instantaneous speed estimator using a low‐cost incremental encoder

In practical industrial applications, the control performance in a wide speed range is hard to ensure, especially under the low‐speed condition with a low‐cost incremental encoder, while the unknown structure parameters may also degrade the tracking performance. This paper proposes a low‐order adapt...

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Bibliographic Details
Published in:Asian journal of control 2021-07, Vol.23 (4), p.1870-1884
Main Authors: Cao, Yihui, Wang, Junzheng, Shen, Wei
Format: Article
Language:English
Subjects:
Adaptive control
adaptive Kalman Filter
Coders
Identification methods
Industrial applications
Inertia
instantaneous speed estimator
measurement noise adaptation
motor control
Noise measurement
Parameter identification
parameter self‐tuning
Permanent magnets
Self tuning
Speed control
Stochastic processes
Synchronous motors
Variance
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Summary:In practical industrial applications, the control performance in a wide speed range is hard to ensure, especially under the low‐speed condition with a low‐cost incremental encoder, while the unknown structure parameters may also degrade the tracking performance. This paper proposes a low‐order adaptive instantaneous speed estimator (AISE) and a self‐tuning control strategy to promote the speed control performance in a wide speed range with unknown inertia parameters. Together with the adaptive‐Kalman‐filter‐based AISE, a novel measurement noise variance updating scheme, which allows more appropriate compensation in the different speed range than fixed error variance, is introduced through the theoretical analysis based on probability and stochastic process. Moreover, an easy‐to‐implement self‐tuning law, integrated with an online recursive‐least‐square‐based parameters identification method, is developed to tune the speed controller, while the AISE is also adjusted online to ensure the control performance with a considerable variation of load inertia. All strategies were implemented in a TMS320F28335‐based permanent magnet synchronous motor (PMSM) control system with a low‐cost 2500‐line incremental encoder, and the results demonstrated the effectiveness of the proposed techniques.
ISSN:1561-8625
1934-6093
DOI:10.1002/asjc.2346