The operation of brushless DC motors is known for a long time, which has several similarities to the synchronous AC motor’s operation. The slow spread of BLDCs was caused by the cost of its electronic commutation systems, the low performance and reliability. Nowadays the semiconductor devices, especially the switches, are far cheaper and reliable than a few years ago. As this was the only significant difference from other motor types, the price decrease caused the spread of the BLDCs, and a wider variety became available recently, even in higher performances. Considering this, in 2015 there is almost no reason to use any other type of motors. The only downside is the more difficult physical and electronic operation.
The BME AAIT department has several laboratory devices for demonstration. With these, students often perform different measurements and experiments, but there is an industrial demand for testing as well. The Department has a wide variety of different motor types, the education of asynchronous, synchronous and (brushed) DC motors is specifically strong, but unfortunately they do not have any BLDC motors, which can also be used for demonstrations or measurements.
My goal is to design and build an intuitive laboratory device for education and tests. During the development of the device I considered the needs of the Department and the future students. I also wanted to have a prototype when I present this final thesis. Manufacturing of a PCB was also an important field to get familiar with.
The final goal is to create a device, which can be integrated to the existing courses in the BME. The main subjects are the following:
Power electronics (Mosfet semiconductor switches, inverter circuit)
Electromechanics (Torque-angular velocity diagram)
Motion control (angular velocity controls, analog PI controllers)
Digital electronics (generating mosfet switching signals from Hall sensor signals)