Motors
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In order to perform any action robots make use of actuators. The drive motors are the most important actuators of mobile robots. In a three-wheeled robot there are two drive wheels that are located at the front. The third wheel of the robot acts as a caster. To make the robot run forward or backward the drive wheels normally run at the same level of speed. If the left wheel is made to turn faster than the right wheel, the robot can pursue a course for turning it to the right. If the right wheel is made to run at faster speed, the robot turns its direction to the left. If left wheel runs in forward direction and the right wheel runs in backward direction, the robot perform a spin to the right. If the right wheel moves in forward direction and the left wheel moves in backward direction the robot spins in the opposite direction. The motors used in the robots are controlled by a fine arrangement of transistors that is known as an H-Bridge. This usually contains four MOSFET transistors that are controlled by two MOSFET inverter gates. Motors are also installed in robots to enabling them to move their arms.
