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This paper presents an improved speed sensorless vector control method for general-purpose induction motors (IMs). The proposed method is based on the d-q axis dynamic model of the induction motor and an improved closed-loop flux observer, which can achieve precise rotor and stator flux estimation over a wide speed range. And then, a rotor-speed-estimation method, based on fuzzy control theory, is...
Direct torque control based on space vector modulation (SVM-DTC) preserve DTC transient merits, furthermore, produce better quality steady-state performance in a wide speed range. In this paper, a torque fuzzy logic controller was designed to substitute the original torque PI controller, and a fuzzy SVM-DTC system based on the torque fuzzy controller was given. A new integration algorithm for estimating...
Introduce the working principle, control method and controller hardware of intelligent wind solar controller (IWSC). Using EWB to simulate the needed hardware of control process, based on the MATLAB simulation of battery charging strategy controlled by fuzzy PID. The simulating method given in this paper decrease the difficulty of hardware debugging, shorten debugging time and save the research expenditures...
Magnetic suspension platform system (MSPS) is a typical non-linear and hysteresis system, so itpsilas difficult to obtain the precise mathematic model and to cater the requirement of rapidity, stability and robustness by applying traditional PID or fuzzy controller separately. Aimed at the characteristics of MSPS, a composite control model combining PID with fuzzy (P-fuzzy-PI) is introduced by applying...
Compared with traditional fuel vehicles, electric vehicles need to deal with the problem of mapping relationship between accelerator pedal and motor-driving torque. At present, this problem is mainly resolved by means of PID control and Fuzzy control. However, the issues on stability, real-time performance, adaptability and complex achievement follow, too. In this paper, a neuromuscular-like model...
A correction factor fuzzy-PID control method is adopted in order to solve the vibration of elevator cab because of the edge effect in the linear elevators driven by the permanent magnet linear synchronous motor (PMLSM). The fuzzy control has the characteristics of being not completely dependent on the mathematics model, but the fuzzy control rules are obtained by experiences of authors or knowledge...
This paper presents a high performance direct torque control (DTC) theme for the induction motor (IM). To solve those problems associated with conventional DTC, such as high current, flux and torque ripple, variable switching frequency, the space vector modulation (SVM) is implemented in the DTC to guarantee the constant switching frequency of the inverter. Meanwhile, the design of a robust speed...
Electromagnetic aircraft launch system (EMALS) use linear motor to accelerate aircraft to launch speed. This paper presents a new method based on fuzzy-neural of HSLIMEO. It is important to improve efficiency not only saving economic and energy, but also reducing environmental pollution. To optimize efficiency, fuzzy controller combined with field-oriented scheme is proposed to work to optimize flux...
To minimize the ripples of the torque and flux linkage and to fix the variable switching frequency produced in the conventional direct torque control (DTC) system for permanent magnet synchronous motors (PMSM), the fuzzy controller was introduced into the PMSM DTC, and a PMSM Fuzzy DTC system based on DSP TMS320LF2407 was implemented. Experimental results show that the proposed Fuzzy DTC system has...
The brushless DC motor with two sets of control channels is presented in this paper; it will be used in an electro-mechanical actuation (EMA) of the next generation more electric-aircraft (MEA). If either of the two channels is failure the motor work under the single channel mode, i.e. fault tolerant operation mode. There exists mutual inductance between the two sets of control channels, so the parameters...
This paper describes the application of indirect adaptive fuzzy control to the speed controller of permanent magnet synchronous motor (PMSM) under external load disturbances and parameter variations in the plant. The proposed indirect adaptive fuzzy speed controller is based on feedback linearization and its parameters are updated by both speed tracking error and filtered prediction error, designed...
Energy saving is the key point for economic development. Energy is conventionally wasted by a braking resistor in general elevator drives. The bidirectional DC-DC converter is used to control the power flow about power supply and the supercapacitor bank and the elevator motor. The supercapacitor bank stores the surplus energy in regenerative status and releases the storage energy in motor status....
In this paper, the control method of extracting maximum power from the seaflow energy is proposed. This paper describes a variable speed seaflow generation system consisted on permanent magnet synchronous motor, bridge rectifier, boost converter and Fuzzy controller. In this proposed seaflow generation system, the duty ratio of boost converter is controlled by the fuzzy controller. An advantage of...
A synchrodrive scheme for dual linear motors position servo system in gantry moving type milling machine is presented in this paper. The feedforward control, disturbance observer and electrical cross coupled control algorithm based on fuzzy PID are applied to the position servo system to counteract the influence of mechanical coupling rapidly, and then meet dynamic synchronized performance in machining...
In this paper, conventional PI controller, sliding mode controller (SMC) and fuzzy logic controller (FLC) for rotor field oriented controlled (RFOC) induction motor drives are studied comparatively. PI is simple but sensitive to parameter variations. SMC provides strong robustness to parameters variations, disturbance rejection and system order reduction. FLC does not need exact system mathematical...
A robotic platform for spraying in fields was used to demonstrate control problem for autonomous vehicle in agriculture. The approach presented here is a simple and effective solution for the path tracking problem of a 4-Wheel Differentially Steered (4WDS) vision mobile robot using a fuzzy-PID controller. The proposed control strategy uses a simple method to avoid motion interference among the four...
To analyze and improve the performance of proton exchange membrane fuel cell (PEMFC) stack, this paper conducts research in intelligent comprehensive control of the operational parameters, such as the operating temperature, pressure, mass flows of hydrogen and air for the PEMFC stack, current density, the exhaust emission quantity of reactant gas, and humidity of the hydrogen and air/oxygen. A detailed...
This paper puts forward an auxiliary fuzzy logic controller for the Voltage Source Converter based HVDC transmission system, VSC-HVDC, to improve the stability of the AC/DC system by damping the oscillation effectively after disturbance. The fast control capability of the VSC-HVDC and the process of area mode oscillations are analyzed. No detailed model of the system is required for the design of...
In this paper, a kind of adaptive control based on fuzzy hierarchical approach for the permanent magnet linear synchronous motor (PMLSM) is proposed. According to different hierarchy of error state, one of the traditional fuzzy controller and integrator is applied. The servo control system can switch from traditional fuzzy controller to integrator smoothly when the control system is close to stable...
A new kind of excitation control scheme in which the fuzzy control and neural network technique is integrated to the design of the generator nonlinear control is proposed. Based on the theory of the synchronous generator excitation control system, one machine-infinity power system nonlinear mathematical model expressed by state equation is established. A fuzzy RBF (Radial Basis Function) neural network...
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