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The spiral torsion spring-based mechanical elastic energy storage (MEES) device presented previously with inherent characteristic of simultaneous variations of inertia and torque is disadvantage to be actuated by conventional control method. This study proposes an improved non-linear backstepping control scheme based on combination of recursive least squares (RLS) and differential evolution (DE) optimisation...
This work investigates the impact of increased penetration of doubly fed induction generators (DFIGs) on electromechanical modes of oscillations of a large interconnected power system. The work proposes a control mechanism aimed at designing the power system stabilizer (PSS) for a DFIG similar to the PSS of synchronous machines. The wind generator power output is taken as input to the PSS. The active...
The adaptive backstepping nonlinear speed controller of permanent magnet synchronous servo motor (PMSSM) with uncertain parameters is designed in this paper. The inertia, viscous friction coefficient and load torque which are vulnerably affected by external disturbances can be estimated in real time. A second-order filter is adopted to reduce the speed overshoot in the starting course of PMSSM. On...
In this paper, a nominal characteristic trajectory following (NCTF) controller for point-to-point (PTP) positioning system for two mass rotary system is introduced and its performance is evaluated. Generally, the NCTF controller consists of a nominal characteristic trajectory (NCT) and a compensator. The objective of the NCTF controller is to make the object motion follow the NCT and end at its origin...
This paper presents an effective method to improve the dynamic performance of permanent magnet synchronous motor(PMSM) servo system which can be implemented via on-line PI self-turning. The algorithm is deduced from the relationship between PI adaptive parameters and the inertia of the PMSM servo system. The proposed method is simple and easy to implement for realtime application. Simulation results...
The inertia, damp and friction force of machine reduces steering-wheel returnability, which drivers occasionally perceive as unpleasant. This phenomenon occurs in any EPS system regardless of motor type or mounting location. In this paper the fuzzy logic control scheme based on angle absolute position for steer wheel return-to-center is proposed to improve the return ability of electric power steering...
In order to prevent global warming, it is important to minimize the dissipated energy of machines. This present paper discusses a method for a reduction ratio of gear trains in a mechanical servo system with friction of all types to minimize the dissipated energy. The Coulomb friction of a gear in the servo system is represented by an efficiency of the gear. Even if the system is nonlinear due to...
This paper presents a direct PID tuning method suitable for spindle motor test and measurement systems. In these systems, the electrical parameters (the armature resistance, the armature inductance, the electromotive force constant) as well as the mechanical parameters (inertia and viscous constants) will be measured or extracted. Based on these parameters, the controller can automatically be designed...
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