DC Motor Tutorial

A DC motor worksby converting electricpower into mechanical work. This is accomplished by forcing current through a coil and producing a magnetic field that spins the motor. One technique to vary the speed of a DC motor is by varying the voltage on the coil. To do this with a microcontroller, PWM output must be used so that the Duty cycle can be c

hanged and automatically the average voltage output will be changed too. Consequently the speed ofthe motorwill be changed. This can be seen in the figure below: To drivea dc motor from amicro-controller, there must be a buffer or an H-bridgedriverso thatthe motorwill not be driven directly by the micro because the current needed is not sufficient. The schematic below shows an example how to connectthe motorto be driven in both direction (foward and reverse) with an L298driverand connected to a microcontroler (using PWM to control the speed control).

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