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Pulse Width Modulation (PWM) is a widely used technique for controlling motors. It is a type of digital signal that is used to control the speed and direction of a motor. PWM works by sending a series of pulses to the motor, with each pulse having a different width. The width of the pulse determines the amount of power that is sent to the motor. By changing the width of the pulses, the speed and direction of the motor can be controlled.

Pulse width modulation is used in a variety of applications, from controlling the speed of a fan to controlling the speed of a robotic arm. It is also used in many industrial applications, such as controlling the speed of a conveyor belt or the speed of a machine tool.

Pulse width modulation is a simple and effective way to control motors. It is easy to implement and can be used to control a wide variety of motors. It is also relatively inexpensive, making it a popular choice for many applications.