Comparative study of fuzzy logic speed controller in vector controlled PMSM drive: minimum number of fuzzy rule-base

This paper presents a comparative study on fuzzy rule-base of fuzzy logic speed control with vector-controlled Permanent Magnet Synchronous Motor (PMSM) drive. Fuzzy rule-base design is viewed as control strategy. All fuzzy rules contribute to some degree in obtaining the desired performance. However, some rules tired weakly do not contribute significantly to the final result and can be eliminated. 'Standard design' of fuzzy rule-base of fuzzy logic controller is identified from numerous publications which is 49 rules is used in order to obtain great speed tracking response. It is possible to minimize the complexity of controller's design by reducing number of rule-base from standard 49 rules to 9 rules. Simulation results that verify appropriateness of the approach are included. A comparison of speed response between both designs is studied. Sensitivity of the designs to load disturbance and changes in command settings is studied and also being compared to demonstrate the effectiveness of the reduced rule base

Pembinaan perisian multimedia pendidikan berasaskan model konstruktivisme kitaran pembelajaran sains lima fasa

Kertas kerja ini membincangkan pembinaan sebu ah perisian multimedia pendidikan bagi tajuk Tekanan Udara dalam mata pelajaran Sa ins khusus untuk pelajar tingkatan dua. Isi kandungan perisian ini selaras dengan huraian sukatan pelajaran Sains KBSM (KPM, 2002). Perisian ini sesuai digunakan untuk pe mbelajaran kendiri mahupun sebagai alat bantu dalam aktiviti pengajaran-pembelajaran di dalam kelas. Aktiviti pembelajaran adalah berasaskan kepada Model Kitaran Pembelajaran Sains yang disepadukan dalam antara muka seperti berikut; Kinetic Theory Of The Gases, Exploring Air Pressure, Principle Of Air Pressure, Application Of Ai r Pressure dan Quiz. Manakala rekabentuk perisian pula, adalah berasaskan kepada m odel ADDIE. Perisian Macromedia Autoware, Adobe Photoshop, Ulead Cool, Sound Forge dan Swish Max pula digunakan untuk menggabungkan pelbagai kriteria seperti teks, grafik, animasi, video dan audio supaya menghasilkan sebuah perisian yang bersifat in teraktif dan menarik. Perisian ini telah dinilai oleh 8 orang yang berpengalaman dalam bidang isi kandungan mata pelajaran Sains dan reka bentuk perisian. Hasil pen ilaian menunjukkan perisian prototaip ini adalah memuaskan daripada aspek isi kandungan, reka bentuk dan kepenggunaannya

Design of auto-stabilization control technique for a quadrotor system

This paper presents the design of auto-stabilization control technique for a quadrotor system. Aquadrotor is a highly nonlinear and has to be stabilized by a suitable control technique. Therefore, the main focus of this research is to design an appropriate control algorithm that able to auto-stabilize the quadrotor at hover. The dynamic modeling of the quadrotor is described by sets of equations of motion that are derived based on the Newton-Euler formalism with the implementation of UKF for parameter identification and state estimation. The control strategy adopted includes feedback linearization coupled with Proportional-Derivative (PD) controller for the translational subsystem and backstepping based Proportional-Integral-Derivative (PID) controller for the rotational subsystem. It is developed in MATLAB/Simulink platform and is validated via real-time implementation. Both controllers give satisfactory simulation results, where acceptable peak of overshoot and small steady state errors are achieved. Experimentally, the throttle is controlled in manual mode while attitude angles are stabilized automatically. The simulation and experimental results show that the proposed controller is able to effectively stabillized the quadrotor

Bearingless Permanent Magnet Synchronous Motor using Independent Control

Bearingless permanent magnet synchronous motor (BPMSM) combines the characteristic of the conventional permanent magent synchronous motor and magnetic bearing in one electric motor. BPMSM is a kind of high performance motor due to having both advantages of PMSM and magnetic bearing with simple structure, high efficiency, and reasonable cost. The research on BPMSM is to design and analyse BPMSM by using Maxwell 2-Dimensional of ANSYS Finite Element Method (FEM). Independent suspension force model and bearingless PMSM model are developed by using the method of suspension force. Then, the mathematical model of electromagnetic torque and radial suspension force has been developed by using Matlab/Simulink. The relation between force, current, distance and other parameter are determined. This research covered the principle of suspension force, the mathematical model, FEM analysis and digital control system of bearingless PMSM. This kind of motor is widely used in high speed application such as compressors, pumps and turbines