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Brushless DC Motor Control on Arduino Platform DOI:10.15199/48.2018.11.24

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In many industrial applications such as blowers, vacuum pumps, and centrifugal compressors, a high-speed brushless DC (BLDC) motor has become a major area of interest due to its high power density, small size, and low weight. It became popular even in the applications with the Unmanned Aerial Vehicle. The Author [2] said that for a high-speed BLDC motor, a simple and robust motor drive system with high energy efficiency and excellent operating performance is required. In a traditional BLDC motor drive, six discrete rotor position signals are needed and detected through three hall sensors. According to the author [4] the BLDC motor provides many advantages such as less consumption, small volume, good stability, larger torque and simple control. That is the reason why BLDC motors are mainly used in the UAV. These motors can be divided into two types. First one is the out-runner. This type of motor has lower spinning speed, but it has far more torque. The typical speed for the out-runners is twice smaller than for in-runners. It means that in-runners usually using the gearbox for increasing the torque. The UAV need torque more speed, and the gearbox adds to the model more weight which is undesirable for all UAV. These are the reasons why UAV using out-runners instead of in-runners. These differences are also visible. The out-runner has the rotor as the casing of the whole motor. It means that the frame is moving and it is also more dangerous to the for nearby obstacles. The rotor of the out-runner motor is composed of the powerful magnet, and the stator is composed of three windings which are shifted from each other by 120 degrees. These motors need a driver to control the switching polarity of the internal winding. The driver has the power part and control part. Power part consists of the power voltage and transistors that can control the current flow through the windings. As mentioned in [3] Three-phase switching signals b[...]

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