How A Servo Motor Works?

By | May 18, 2018

Within the servo motor, there’s a built-in ‘DC’ (direct current) motor with gearing and feedback control loop circuitry. This gearing enables speed decrease and higher torque production.

The control loop circuitry is responsible for its high precision management. This lessens the need for an extra motor driver circuit. Servos or servo motors in this endeavor rotate from approximately 90 to 180 degrees array. Notice that servos can be altered to rotate continuously (360 degrees).

Wiring of the servo is easy; the red wire is for ‘DC’ +5V, black wire connects to ‘GND’ (ground) and white wire for signal (where ‘PWM’ is delivered to the engine). The white cable is responsible for controlling amount of rotations. For more information about servo motor’s, you can check out the website¬†

Voltages from 4.8V to 6.0V may be used to power a servo. Higher voltage rating (6.0V) generates higher torque. However, for safety conservation, a controlled ‘DC’ voltage of 5V is used. In this manner, servo motors wouldn’t exceed its maximum voltage limit.

The servo motors are usually powered by batteries. This power supply is then regulated to 5V (using voltage regulator). The number of voltage depends on software needed. 5V voltage is sufficient to drive torque to do useful motions. Commonly, servo motors are powered by smaller batteries such as Nickel Cadmium (‘NiCd’) or Nickel-Metal Hydride (‘NiMh’) or even the newest; Lithium Polymer (‘LiPo’).

External power supply delivers power to the motors. Power supply to microcontroller circuit board ought to be different, and powered by pc universal serial bus ‘USB’ (Universal Serial Bus) connection. Both powers supplies ground connections must be in common to one another, for the servo motors to work properly.

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