Friction identification and compensation design for precision positioning

Precision positioning systems driven by linear motors are vulnerable to force disturbances owing to the reduction of gear transmission. The friction, included in the disturbance, can be modeled and compensated to improve the servo performance. This paper proposes a modified Stribeck friction model (...

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Bibliographic Details
Published in:Advances in manufacturing 2017-06, Vol.5 (2), p.120-129
Main Authors: Li, Feng-Tian, Ma, Li, Mi, Lin-Tao, Zeng, You-Xuan, Jin, Ning-Bo, Gao, Ying-Long
Format: Article
Language:English
Subjects:
Compensation
Compensators
Computer simulation
Consistency
Control
Coulomb friction
Disturbances
Electric motors
Engineering
Errors
Machines
Manufacturing
Mechatronics
Nanotechnology and Microengineering
Optimization
Optimization algorithms
Processes
Robotics
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Summary:Precision positioning systems driven by linear motors are vulnerable to force disturbances owing to the reduction of gear transmission. The friction, included in the disturbance, can be modeled and compensated to improve the servo performance. This paper proposes a modified Stribeck friction model (SFM) and an optimization algorithm for consistency with the positioning platform. The compensators based on the friction model and disturbance observer (DOB) are simulated. The simulation results show that as compared with the DOB compensator (the velocity recovers by 5.19%), the friction model based compensator (the velocity recovers by 10.66%) exhibits a better performance after adding the disturbance. Moreover, compensation comparisons among the Coulomb friction, traditional SFM, and modified SFM are performed. The experimental results show that the following error with modified SFM compensation improves by 67.67% and 51.63% at a speed of 0.005 m/s and 0.05 m/s, compared with the Coulomb friction compensation. This demonstrates that the proposed model, optimization algorithm, and compensator can reduce the following error effectively.
ISSN:2095-3127
2195-3597
DOI:10.1007/s40436-017-0171-z