Method For Brushless DC Motors Research Articles

Position Sensorless Driving of BLDCM Using Neural Networks

A sensorless driving method of brushless DC Motors (BLDCM) using neural network has been studied in this paper. Considering the nonlinear characteristics and the parameter error of the modeling, neural networks are introduced to estimate the electromotive force (EMF). The results of simulation and experiment using offline trained neural networks show the proposed method is useful. In addition, the robustness about the parameters is discussed.

Simplified simulation methods for polyphase brushless DC motors

This paper presents a simulation method for brushless DC motors. The purpose of this method is to provide a solution to the initial design process, where the simulation speed is important due to the numerous variables that have to be considered. The method requires a reduced number of parameters in order to simplify it and to facilitate the design process. It is applicable to polyphase motors regardless of its connection or phase number. The simulation method can simulate the phase current control system or a DC bus current feedback system. The later control system is widely used in low-cost brushless DC motors. The simulation method is based upon the average value modelling of the inverter leg, at the PWM scale, in different modulation conditions, modelling almost all the inverter structures with transistors as active elements. The experimental results from a seven-phase brushless DC motor with one uncontrolled phase validate the modelling method. The comparison of the average torque, the current, voltage and torque waveforms in several operating conditions shows that the simulation method can predict the comportment of a brushless DC motor without an excessive computational burden, so it can be readily used as a design tool for this kind of motor.

Automatic design method of brushless DC motors for VCRs

An automatic design method for all types of brushless DC motors for VCRs was developed. Quick and easy motor design with no trial manufacture was realized, enabling a motor of minimum size to achieve maximum efficiency. In carrying out this work, the authors systematized the parameters governing the motor characteristics of a brushless DC motor and theoretically analyzed and clarified the correlations between parameters and characteristics. Various experiments were conducted to increase the reliability of the theoretical analysis of the magnetic circuit. Some motor rules vital in motor design were identified and used to devise an algorithm for automatic motor design, and interactive software was developed on the basis of this algorithm. The resulting design method is a highly practicable one and permits an optimum motor design that satisfies all the conditions imposed by the equipment in which the motor is to be used. >