Konstruktion av pedagogisk Borstlös DC-motor för undervisning

The brushless DC (BLDC) motor is a crucial component of our modern society and exists in a number of everyday items. It is an evolution of the conventional brushed DC motor. It has several advantages compared to the brushed DC motor including less maintenance and better control and precision of the rotary displacement. The goal of this project is to construct a BLDC motor made by 3D printed plastic parts and a control system using Arduinos. The purpose of the motor is that it will be used to demonstrate its functions and to educate engineering students at Uppsala University in electrical propulsion systems. Therefore the motor is designed with educative purposes and it is supposed to be easily controlled by an operator with clear indications of the internal workings. The finished motor consists of a stator which holds six electromagnets placed equally distanced from each other that makes up the tree different phases. In the middle of the stator a rotor is placed which holds four poles of permanent magnets with different polarity. The position of the rotor is determined and controlled by placing three equally distanced hall sensors in the stator. The signals from the hall sensors is sent to the Arduinos which in turn control the polarity of the electromagnets and make the motor rotate. The control system is contained in a plastic box with controls for different modes available for the operator and also indications of the position of the rotor and polarity of the electromagnets