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Electrical, Control and Communication Engineering

The Journal of Riga Technical University

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Constant Current Models of Brushless DC Motor

Krzysztof Krykowski / Janusz Hetmańczyk
Published Online: 2013-09-05 | DOI: https://doi.org/10.2478/ecce-2013-0010


Two constant current models of Permanent Magnet Brushless Direct Current Motor (PM BLDC) are presented in the paper. In the first part of the paper principle of operation, basic properties and mathematical equations describing PM BLDC models are given. Then, two different constant current models of PM BLDC motor are considered: In the first model, PM BLDC motor is approximated with dc motor; in the second model, modified constant current model is applied with additional block, which is used to take into account the impact of inductance on torque-speed characteristics. In order to verify these models, torque-speed characteristics have been determined and compared for different motor supply voltages. After running a series of simulation and laboratory tests, we have found that this modified model (which makes allowance for the influence of inductance on torque-speed characteristics) ensures obtaining torque-speed characteristics identical to those of the real motor. Therefore, this model may be recommended for those simulation tests which do not consider effects occurring inside the electronic commutator-motor circuit. However, approximation of PM BLDC motor with dc motor is not recommended in computer tests.

Keywords: Permanent magnet machines; brushless machines; analytical models; mathematical model; MATLAB

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About the article

Krzysztof Krykowski

Krzysztof Krykowski received his Ph.D. and D.Sc. degree in electrical engineering from the Silesian University of Technology (Gliwice/Poland) in 1975 and 1988 respectively. He works at Silesian University of Technology as the professor of electrical engineering. Subjects of his lectures and research are power electronics and electrical drives. He is the author of 2 books and over 100 papers in these areas. Presently he especially interests in modelling, control and supply of high speed brushless motors. Member of Association of Polish Electrical Engineers SEP, and Polish Society for Theoretical and Applied Electrical Engineering PTETiS. Postal address: Silesian University of Technology, Faculty of Electrical Engineering, Department of Power Electronics, Electrical Drives and Robotics Bolesława Krzywoustego 2, 44-100 Gliwice, Poland.

Janusz Hetmańczyk

Janusz Hetmańczyk received M.Sc. and Ph.D. degrees in electrical engineering from Faculty of Electrical Engineering, Silesian University of Technology in 1998 and 2006, respectively. He works in department of Power Electronics, Electrical Drives and Robotics. He is an author and co-author of close to 50 scientific papers. His scientific activities involve low power drives, electric vehicles especially modelling, simulation, control and applications of brushless DC motors. Postal address: Silesian University of Technology, Faculty of Electrical Engineering, Department of Power Electronics, Electrical Drives and Robotics, Bolesława Krzywoustego 2, 44-100 Gliwice, Poland.

Published Online: 2013-09-05

Published in Print: 2013-08-01

Citation Information: Electrical, Control and Communication Engineering, ISSN (Online) 2255-9159, ISSN (Print) 2255-9140, DOI: https://doi.org/10.2478/ecce-2013-0010.

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