21 Sep '12, 9pm

How It Works: How Servo Motors Work

How It Works: How Servo Motors Work

To fully understand how the servo works, you need to take a look under the hood. Inside there is a pretty simple set-up: a small DC motor , potentiometer , and a control circuit. The motor is attached by gears to the control wheel. As the motor rotates, the potentiometer's resistance changes, so the control circuit can precisely regulate how much movement there is and in which direction. When the shaft of the motor is at the desired position, power supplied to the motor is stopped. If not, the motor is turned in the appropriate direction. The desired position is sent via electrical pulses through the signal wire . The motor's speed is proportional to the difference between its actual position and desired position. So if the motor is near the desired position, it will turn slowly, otherwise it will turn fast. This is called proportional control. This means the motor will on...

Full article: http://www.jameco.com/Jameco/workshop/howitworks/how-serv...

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