Abstract
This paper discusses nonlinear controller structure design for a synchronous reluctance motor (SynRM). The SynRM is represented with a nonlinear dynamic model. All presented nonlinearities of the SynRM are respected in the controller design procedure. A nonlinear controller policy is used for a SynRM positing system. The nonlinear controller design is based on the chattering alleviation technique for the super-twisted algorithm (STA). The alleviation technique assumes the presence of a fast parasitic dynamic, or fast, actuator. Based on the motor structure, the STA controller is designed only for the mechanical subsystem, where the electrical part presents the parasitic dynamic, and is taken in to account in the chattering suppression procedure. Chattering rejection is based on the STA describing function and harmonic balance equation. The approach allows determination of fast oscillation parameters, such as amplitude and frequency of oscillation. The conditions for the controller parameters’ selection are derived with regard to the given oscillation parameters. The derived conditions cover the stability analysis for the STA controller, as well as the stability condition for current controllers and chattering amplitude minimization. The result is confirmed with an example.
Highlights
A synchronous reluctance motor is one of the oldest types of electric motors and uses the principle of reluctance torque to produce electro-mechanical power [1]
The super-twisted algorithm (STA) efficiency will be compared with some standard approaches, which are based on linear controller and nonlinear FSCM structures
A positioning system with a STA controller with a synchronous reluctance motor (SynRM) is presented in this paper
Summary
A synchronous reluctance motor is one of the oldest types of electric motors and uses the principle of reluctance torque to produce electro-mechanical power [1]. Due to its simple construction, ability to withstand the harsh environment, high power to weight ratio, low-cost manufacturing and energy use, the synchronous reluctance motor (SynRM) has become a viable alternative to the other electro-mechanical machines, such as an induction machines (IMs) and permanent-magnet synchronous machines (PMSynMs) [2,3]. If we corroborate with the fact that the availability of the highly efficient permanent magnets have a limited supply ability, wherein the modern technology and economy trend to manufacturing cost reduction, sustainability and environment protection, the SynRM systems have become more and more attractive in diverse applications and gained a lot of attention in the research and engineering communities. There were many SynRM’s presented, which exploit the synchronous principle of the operation, which are often related to the rotor angle
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