Finite-time Command Filter Control Of Permanent Magnet Synchronous Motor Considering Iron Loss

Permanent magnet synchronous motors(PMSMs)have been widely used in various fields because of their small size,high power density,good dynamic performance,simple and reliable characteristics.But at the same time,PMSMs is also a multivariable,strong coupling and easily affected by external load disturbance.Therefore,how to overcome the above problems and better control PMSMs is of great significance.In the actual operation process,PMSMs will inevitably produce a lot of iron loss,which will make the PMSMs temperature rise and even produce permanent demagnetization phenomenon.Therefore,when controlling PMSMs,the influence of iron loss can not be ignored.In this paper,a finite-time command filtering control strategy considering input voltage saturation and a finite-time command filtering control strategy based on observer technology are proposed for PMSMs considering iron loss by combining backstepping control,fuzzy logic system,finite-time control technology and command filtering control technology.The main research results are as follows1.For a class of strict feedback nonlinear systems,the finite-time command filtering control strategy is studied.Firstly,the fuzzy logic system is integrated into the controller design process to solve the unknown nonlinear function in the system.Secondly,command filtering technology is used to solve the problem of computational complexity,and error compensation is designed to compensate the filtering error.Finally,the finite-time control technology is introduced to ensure that the system can have faster convergence speed and better tracking effect.2.Aiming at the problem of input saturation in PMSMs considering iron loss,a finite-time command filtering backstepping controller is designed.Firstly,the command filtering technology is used to approximate the virtual control function,which avoids the repeated derivation process and reduces the computational burden.And the technology of error compensation is used to reduce the adverse effect of filtering error.At the same time,the finite-time control technology is introduced to realize finite time tracking control.In addition,the influence of input saturation is considered,which makes the proposed control strategy more practical.Finally,the stability of the system is analyzed and compared by MATLAB simulation.Simulation results show that the proposed method can overcome the influence of input saturation and achieve better control effect.3.A finite time command filtering control strategy based on observer technology is proposed for speed sensorless PMSMs with iron loss.Firstly,the reduced order observer is used to estimate the angular position and the angular velocity of PMSMs.At the same time,the finite-time control technique and command filtering technique are combined to improve the asymptotic convergence of the tracking signal and ensure that the system converges to the equilibrium point in finite time.In addition,in order to reduce the influence of filter error,error compensation technology is introduced.Finally,the simulation results show that the designed reduced order observer can estimate the rotor angular velocity,and the control strategy proposed in this paper has better control effect than the command filtering control method.In this paper,based on the backstepping method and combining the finite-time control technology,command filter control technology,fuzzy logic system and observer technology,a controller is constructed to control the PMSMs system with iron loss.The controller constructed in this paper not only solves the problem of "computational complexity",but also improves the response speed and convergence speed of the system.At the same time,it also takes into account the influence of iron loss and input voltage saturation,which is easier for practical engineering application.