Feedforward suppression of force ripple based on a simplex-optimized dither signal.
This paper presents the design and realization of a feedforward dither signal to reduce the force ripple in an iron-core permanent magnet linear motor (PMLM). A composite control structure is used, consisting of three components: a simple feedforward component, a PID feedback component, and a ripple compensator (RC). The first two components are designed based on a dominant linear model of the motor. The dither signal is generated based on a signal model which is identified using a multidimensional simplex downhill method. In this way, a simple approach is available to eliminate or suppress the inherent force ripple, thus facilitating smooth precise motion while uncompromising on the maximum force achievable. Real-time experimental results verify the effectiveness of the proposed scheme for high precision motion trajectory tracking.
Tan
K K
KK
Department of Electrical Engineering, 4 Engineering Drive 3, National University of Singapore, Singapore 117576.
Chin
S J
SJ
Dou
H F
HF
D000465:Algorithms; D005246:Feedback; D016014:Linear Models; D008962:Models, Theoretical; D009038:Motion; D011786:Quality Control; D013269:Stochastic Processes; D013314:Stress, Mechanical