Abstract
In this paper, a fuzzy sliding-mode observer, which uses sigmoid function for speed sensorless control of permanent-magnet linear synchronous motor (PMLSM) is proposed. Most of the observers use sign or saturation functions that need low pass filter in order to detecting back electromotive force. In this paper, the sigmoid function is used instead of discontinuous sign function to decrease undesirable chattering phenomenon. By reducing the chattering, detecting back EMF can be done directly from switching signal without any low pass filter. So the delay time because of low pass filter, in the proposed observer is eliminated. Furthermore, there is no need to compensate phase fault in position estimating. The simulation results show advantages of proposed observer over conventional ones.
Highlights
Permanent-magnet linear synchronous motors (PMLSMs) are used widely in systems that need linear drives
Comparative methods, Kalman filter, and sliding mode are some of estimating methods that are based on observers
In order to avoid of using the low pass filter and the phase compensator based on back EMF, in this paper a fuzzy sliding mode observer with sigmoid function for detecting the back EMF in a PMLSM is designed to estimate the speed and the position of the rotor
Summary
Permanent-magnet linear synchronous motors (PMLSMs) are used widely in systems that need linear drives. Comparative methods, Kalman filter, and sliding mode are some of estimating methods that are based on observers. Mation, which is given by the estimated angular velocity, is not enough for compensating [10], [11], [12] As it mentioned above, in conventional sliding mode observer method there are the chattering phenomenon and the phase lag. In order to avoid of using the low pass filter and the phase compensator based on back EMF, in this paper a fuzzy sliding mode observer with sigmoid function for detecting the back EMF in a PMLSM is designed to estimate the speed and the position of the rotor. The electromagnetic thrust of PMLSM Fthrust with p pair poles is concluded from Eq (3) and Eq (8) as follows: Fthrust
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