Nowadays because of the endeavor to designing high power efficient and reliable devices the Brushless Direct Current motors (BLDC) appear in more and more application field. The BLDC motor’s principle of operation is known for a long time, but the technological boundaries of power electronics and the high price of these devices made impossible or uneconomical in most of cases the usage of this technology until the middle of the 80’s. Since this date the power electronics going throw an incredibly fast development process which appeared in almost every areas of the life. The cellphone chargers became smaller, the vehicles more efficient, the household devices lighter and renewable energy applications also appeared.
With the appearance of the microprocessors the development prices of the control systems have largely decreased. These factors opened the way for BLDC motors.
The usage of BLDC-s has a lot of advantages, the most prominent of these are the high efficiency and reliability, low maintenance requirement, great controllability and high power/volume ratio.
At Budapest University of Technology and Economics lot of degree program contains subjects about electromechanics, including the main electric motor types. There are great measurement compilations and illustrative tools for synchronous machines, induction machines, DC motors and BLDC motors as well, but because of the quick rising of BLDC motors it’s required to develop new laboratory devices to demonstrate the operation of these machines.
The aim of my final project is to design and build a motor control board for BLDC motors, which can be used for measurements and for demonstrations during the engineering student’s laboratory sessions.
In the first part of my essay after a short historical overview I would like to review the theoretical background and operation of the BLDC motors and its control system. The main part of my final project presents the development process including the reasons of decisions, the description of the fabrication and the testing processes and finally the summary of the results and experiences.