![]() So we have decided to use High RPM low torque motor. RPM of the DC geared motors was 120 RPM with high torque reaching 8 kg.cm.īrushed DC gear motor (1): This motor is responsible for the cutting action of grass. ![]() It is also vital that we use a geared motor for better power transmission and to avoid damaging the motor coils. High torque helps in load pulling and since Lawn mowing is a slow operation, we only need low-speed motors. ĭC geared motors (2): These motors are meant for the wheels of the robot where we require high torque and Low speed. ![]() Ultrasonic Sensors (2): 1 parallax ping, 1 hc sr04.Cooling fan (1): as Heatsink (12 volts).Brushed DC gear motor (1): For blades (6-24 V/0.240A/ 11 000 RPM) MO103 ELAK electronics.DC geared motors (2): for Driving wheels type: ( jga25-370-12V-120).Tracks and wheels: Procured from Commercial market (check here).L-brackets, Fixtures, Peripheral parts: 3D printed.Structure/Body - 5mm clear Plexiglass: Laser Cut.We have achieved such dynamics in the tracks using tensile spring and giving force to only the top wheels on each side. In order to achieve traction even during small obstacles, the driving tracks should be flexible (dynamic) a bit to be able to climb or move over it. Of that, wet surfaces, muddy terrain, rocks, and stones are quite challenges. Pretension Mechanism: For a Lawnmower, it is common to have different terrestrial surfaces. Apart from the Bumpers, Ultrasonic sensors are provided to sense obstacles from a range of distance. When the bumper hits the smaller obstacles in front, the robot changes its direction. Bumpers are given for the robots in the front which uses a limit switch operation. So it is essential to provide a safety mechanism in order to save it from damage. Also, the traction is high even on slippery surfaces like snow or wet concrete (conditions of a Lawnmower)īumpers and Sensors: Practically speaking, there are a lot of chances for a robot in lawn to face numerous obstacles like a light post, fence, Rocks, etc. Compared with wheels, continuous tracks have high performance and optimized traction system, which is a plus in power delivery efficiency. The L-clamps was manufactured through 3D printing.ĭrive: For the Lawnmower, we have used Continuous tracks instead of individual Rotary wheels. Apart from that, we have used L-clamps as shown in images to assemble the body parts as it could make the structure firm and rigid. Structural rigidity: The body parts are assembled with each other by means of small assembly protrusions. Later up on procurement of actual parts like motors, sensors we refined their interfaces in later stages before Laser cutting. The interfaces that need to be provided for a commercial component to fit in was provided in a generic manner in the initial stages. A '.STL' format of the assembly is available for viewer's reference.Īfter brainstorming, components that could be used for the robots were roughly drafted. Individual structural parts were created separately and assembled in an assembly file. The 3D designing has been done with Catia V5. Our team composition was a good mixture of multi-talents and multicultural colleagues. Our aim was to work as a team and we planned tasks and split among ourselves which benefited for the results. ![]() Compared with the traditional lawn mower, the intelligent lawn mower has advantages of the environmental protection, the low human power consumption and high security.Īn intelligent lawn mower is worth studying and has large quantities of commercial values, social values and academic values, which can make reflections on the development of robotics and automatics indirectly. The control system can compare the data sent from the perception with that in its database and correct instructions for the moving and mowing mechanics to get a stable running situation. The perception system can detect the environmental values, the moving mechanic and the mowing mechanic and send the results to the control system. To cut down on the consumption of the protection of lawns, we think of an idea to make an intelligent lawn mower which can replace the traditional lawn mower.Ī normal intelligent lawn mower consists of the perception system, the control system, the moving system and mowing system. When it comes to maintaining lawns, mowing is the most tedious task which is not only dull but also highly repeatable and often consumes huge numbers of the human and material resource. When a Lawn is not well maintained, it turns into a grassland (there is a significant difference between both).
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