J. R. B. A. Monteiro

Extended DQ Transformation for Vectorial Control Applications of Non-sinusoidal Permanent Magnet AC Machines

This paper presents an extended dq transformation model of non-sinusoidal permanent magnet synchronous machines (SM-PMSM). This transformation permits to obtain a simpler electromagnetic torque equation for this type of machine. The resultant electromagnetic torque equation obtained from this model is directly proportional to the machine quadrature stator current. Initially, the three-phase equations of the motor are presented. These equations are widely used for sinusoidal permanent magnetic machines, as well as for non-sinusoidal ones. The well known vectorial model for sinusoidal PM machines is shown. Then, a vectorial model for a non-sinusoidal PM machine is presented and the proposed vectorial model with variable dq axis magnitude is developed. Simulation results of the electromagnetic torque, produced by a brushless DC drive system using conventional six step open loop control are presented. These results are compared with those produced by the same system using the proposed model into an open loop system and into a closed loop system

Magnetic Field Analysis of a Brushless DC Motor Comparing Ferrite and NdFeB Magnets on Rotor

This paper presents comparisons between three-phase permanent-magnet motor with ferrite magnets on rotor and other with NdFeB (bonded). Related to this replacement, the advantages and disadvantages are quoted. The analysis of magnetic field is made through the finite element method. The used machine has nonsinusoidal flux. Its application main is in hermetic compressor household refrigeration systems. Also, the geometric and magnetic characteristics are presented.

A Comparative Study between Symmetrical Two-Phase Induction Motor Model Using dq0 Transformation and Model Using Spiral Vector Theory Operating under Unbalanced Voltage

This paper is a comparative study between the classic modeling using dqO transformation (or d-q axis model) and the spiral vector theory applied to study symmetrical two-phase induction machine (STPIM) operating under unbalanced voltage. To compare both types of modeling, simulations were performed to solve differential equations. The comparative graphics are also shown in the paper.

Harmonic Detection Based on Artificial Neural Networks for Current Distortion Compensation

In this paper a method for the determination of part of the current harmonic components for the selective compensation harmonic by single-phase active power filter is presented. The non-linear load is composed by an AC controller with variable resistive load. The first six components are identified through artificial neural network. The effectiveness of the proposed method and its application in the single-phase active power filters with selective harmonic compensation are verified. Simulation results are presented to validate the proposed approach.

Introducing the learning of active power filters using the software matlab - simulink

This paper presents the development of a simulation platform for the study and conception of ac- tive power filters. This platform is developed using the software MATLAB as its base, through its environment SIMULINK and other tools, just as PSB (Power System Blockset). The system is composed of AC single phase controllers and a parallel active power filter. The plat- form is quite versatile and flexible allowing the simula- tion of different situations. This flexibility helps the teaching and learning of a current and important prob- lem in the power electronic area. The platform was de- veloped for the purpose of using it in electric engineering undergraduate courses. However, it possesses enough flexibility to be increased and also used in graduate courses.

Anti-windup method for fuzzy PD+I, PI and PID controllers applied in brushless DC motor speed control

This paper proposes a new anti-windup method for integrative portion of many controllers: PI, PID and fuzzy PD+I. The proposed method does not require any coefficient for the anti-windup method, as other known anti-windup methods does. All the deduction and development of the proposed anti-windup method for PI, PID and fuzzy PD+I are presented here, resulting in two general and simple anti-windup equivalent methods. Following, the application of the proposed anti-windup method in a brushless DC motor speed control, employing a fuzzy PD+I controller, is shown and compared to a traditional anti-windup method, which achieves better results than that traditional method.

A Rapid Prototype Design to Investigate the FPGA-Based DTC Strategy Applied to the Speed Control of Induction Motors

This work presents a virtual prototype for study and simulation of DTC technique applied to the speedy control of induction motor. The implementation is supposed to be realized in a FPGA device. The simulation was conducted using the Matlab/Simulink and the ModelSim programs. While the inverter/motor dynamics is executed in the Matlab, the ModelSim perform the speed control and the DTC procedure witch is written in VHDL-code. The both programs work in co-simulation mode provided by the Link-for-ModelSim toolbox in the Simulink. This virtual prototype was tested with the implementation of the DTC strategy using float point representation.

Implementation of a Non-Sinusoidal Permanent-Magnet Synchronous Machine Vectorial Control

This paper shows the results of the implementation of a proposed vectorial model for non-sinusoidal air-gap magnetic flux density distribution permanent-magnet synchronous machines (SM-PMSM). This work shows a comparison between this kind of machine fed by a conventional six-step 120deg inverter and an inverter with the proposed non-sinusoidal vectorial machine model. The same machine is fed by these two kinds of converter in a positioning drive system of a machine-tool application, both in similar situations. The results of rotor position are shown for those two situations, showing the effect of electromagnetic torque ripple in rotor position, consequently, in tool positioning. This same machine was submitted to a traction application and was fed by the converter employing non-sinusoidal vectorial machine model. The measured stator currents and simulation results were compared in similar situations

Integral sliding mode controller with anti-windup method analysis in the vector control of induction motor

This work presents an integral sliding mode controller, applied to the three-phase induction motor IM using indirect field oriented control technique. Besides seeking high dynamic performance using the slinding mode controller, it is discussed the necessity of a parametric action control (known as equivalent control) to turn the system stable. To do so, it is used an integral sliding mode controller with anti-windup method. The motor performance is verified by means of numeric simulations and experimental tests with load disturbances.

Sliding mode control of brushless DC motor speed with chattering reduction

This paper proposes the use of an analog switching function in sliding mode control for a brushless DC motor speed, with the objective of input chattering reduction. The sliding mode control topology is used in the mechanical speed loop control as well as in the stator current loop control. The results show a good chattering reduction, a good machine performance and a good robustness of the controller due to disturbances, without the need of fine tunneling of the controller parameters, as in other kinds of control. The parameters of a real machine where used in the simulations. This kind of function in the used sliding mode controllers turned to be a very good alternative depending on the application.