The paper proposes a model of brushless DC motor considering behavior of the motor during commutation. The torque characteristic of BLDC motor presents a very important factor in design of the BLDC motor drive system, so it is necessary to predict the precise value of torque, which is determined by the waveforms of back-EMF. After development of simple mathematical model of the BLDC motor with sinusoidal and trapezoidal waveforms of back-EMF the motor is simulated in the MATLAB/Simulink environment. Based on analysis of the time responses a comparison study of results of both BLDC motor types is presented in Graphical User Interface of MATLAB environment.

Modeling and simulation of the BLDC motor in MATLAB GUI

Since the first appearance, the fields of electrical machine and drive systems have been continuously enriched by introduction of many important topics. Progress in power electronics, microcontrollers, new materials and advances in numerical modeling have led to development of new types of electrical machines and in field of electrical drives to realization of complex control algorithms. Their verification is usually done by simulation during system design, thus the effort is concentrated to development of simulation models.

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Dynamic Simulation of Electrical Machines and Drive Systems Using MATLAB GUI

Brushless DC motors (BLDCM) are most popular because of their higher efficiency, less maintenance and precise control characteristics. However, this motor has nonlinear nature and can be affected easily by the parameter change and disruption. For any automobile and industrial applications, it is essential to govern the speed accurately. Because of their fixed gain values, high peak overshoot and high settling time the conventional PI controllers are inadequate to control this motor accurately. In this paper, to resolve the complications coupled with the typical PI, Fuzzy Logic Controller (FLC) is intended to eradicate the overshoot and to produce fast speed response of motor. The mathematical modeling of BLDCM along with the controller has been deduced for a 10 kW BLDC motor. The simulations are done in Matlab/Simulink environment for validating characteristics of FLC.

Mathematical modeling and fuzzy logic control of a brushless DC motor employed in automobile and industrial applications

The paper deals with the identification of a direct current motor using experimentally measured transient processes of the motor starting and running-down at a no-load driving torque. The identification is based on the equation error method, which was chosen for its ability to work with noisy data. The major point of the method is that the data of the experimentally obtained measurements are reciprocally associated with the differential equations defining the analysed object. The paper discusses the process and the results of identification.

DC motor parameter identification using equation error method

The work reported here was aimed at improving the practical efficiency of the model-based development and integration of electromechanical actuators. Models are proposed to serve as preliminary design, virtual prototyping, and validation. The first part focuses on the early phases of a project in order to facilitate the identification of modelling needs and constraints, and to build a top-level electromechanical actuator model for preliminary studies and sub-specification. Detailed modelling and simulation are then addressed with a mixed view on the control, power capability, and thermal balance. Models for the power chain are firstly considered by focusing on the key practical issues in modelling the electric motor, power electronics, and mechanical power transmission. The same logic is applied to the signal and control chain with practical considerations concerning the parameters of the controller, its digital implementation, the sensors, and their signal conditioning. Numerous orders of magnitude are provided to justify the choices made and to facilitate decision-making for and through simulation activities.

https://hal.archives-ouvertes.fr/hal-03341178/document

Practical Considerations in the Modelling and Simulation of Electromechanical Actuators

This paper proposes a model of brushless dc motor drive considering behaviour of the motor during commutation and waveform of backemf, for dynamic simulation of Electromechanical Actuator (EMA) under MATLAB/Simulink environment Ideally trapezoidal backemf is considered in simulations for BLDC motor, which gives a constant torque Practically, torque ripple exist, mainly due to emf waveform imperfections, current ripple and phase current commutation Hence, an error can occur between real value and the simulation result First a simple mathematical model of the BLDC drive is developed The motor model is then simulated using MATLAB/Simulink, with sinusoidal and trapezoidal waveforms of backemf A comparison study of results of both the cases is done Finally the bldc motor model is integrated with the other models of the EMA and a dynamic simulation of the EMA is obtained

A.M. Tom

Papers

Dynamic simulation of brushless DC drive considering phase commutation and backemf waveform for electromechanical actuator