We have listed the major components of an analog servo motor. As far as the theory of operation goes, the aficionados can integrate servos and microcontrollers in multiple projects.
Here are the components of an analog servo drive.
- The controller circuit
The controller circuit tends to transform a digital PWM waveform into a drive signal to the motor while keeping an eye on the position feedback from the servo.
- DC Motor
The DC motor then transforms the electrical energy into a rotational movement. Then the driving voltage to the motor is pulsed. The motor can rotate in a clockwise position or in a counterclockwise position.
- The Gearbox
The gearbox of the analog servo acts like a transmission equipped in your car. The DC motor spins at a higher RPM than you want your servo arm to rotate and there is a possibility of not having sufficient native torque in the motor to move the load with any kind of resistance. The gearbox brings down the angular velocity of the servo which effectively slows down its rate of rotation and the gears let the motor to push and pull with more torque.
- Positional feedback
Last but not the least. The positional feedback of the servo arm is triggered by a potentiometer to a variable resistor that turns at the very same rate and in the same direction just like the servo arm itself. There is a consistent rate of voltage applied across the potentiometer itself and as the adjustable leg is moving with the servo it tends to produce an output voltage that is exactly proportional to the rotation. If you ever get a chance to see a servo in action, don’t miss it. When the user adjusts the PWM signal to the analog servo, the signal is displayed in the oscilloscope and the servo arm is still rotating via its range of movement.
What is Servo Control?
Servo control is accomplished by transmitting a servo a PWM or a pulse width modulation signal, which is a series of repetitive pulses of variable width where either the pulse width or the duty cycle of the pulse train helps in ascertaining the position to be accomplished by the servo. The PWM signal can be transmitted from a radio controller receiver to the servo or from the most common microcontrollers like the Arduino.