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Brushless DC Motor (BLDC) Powered RC Racing Vehicle (October 2016)
The vehicle was a very simple and miniaturized version of a modern automotive. It had 4 wheels and 2 axles with rear wheel drive. The rear axle was powered by a belt-pulley drive. The source of power was a Brushless DC Motor which was powered by a 3 cell Lithium Polymer battery. The speed of the Brushless DC motor was controlled through an Electronics Speed Controller (ESP). The front axle was used for steering. For going left or right, the whole axle was rotated clockwise or anticlockwise respectively about it's midpoint with the help of a servo motor. Both the ESP and the servo were connected to a Remote Control (RC) Receiver. The speed and the steering could thus be controlled using a RC transmitter.
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This project was build for competing in the Fury Race of Mechanical Festival 2016 organized by Mechanical Engineering Department, BUET. The vehicle won the 4th position despite facing some problems on the track. The project team consisted of Kazi Ragib Ishraq Sanim and Mahfuzur Rahman.
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Poblems:
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The Belt Pulley drive did not provide enough torque to overcome difficult terrains. Here, A gear train drive would have worked better than a belt pulley drive.
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The steering mechanism worked by rotating the whole axle about it's midpoint. It required more energy and eventually caused the servo to fail. To solve this issue, a power steering mechanism could have been incorporated.
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The front of the vehicle was lighter than the rear. Therefore, the vehicle seemed prone to upturn which experiencing a slope or high acceleration. This could have been solved using a front wheel drive or adding some weight to the front of the vehicle.
