Servo Motor (มอเตอร์ เซอร์ โว, which is the term in Thai) is not a new technology. However, they are relevant in today’s world. What makes servo great is the high precision they provide with their Position Feedback System. Moreover, it is compact, light, and energy-efficient, making them the first choice to be used in the following.
- Radio Controlled Car
- Food Services
- Industrial Application
However, before using the motor, it would be better to know how they work and what more this little guy can do.
Insides of Servo Motors
The servo has a positional shaft that uses the gear for adjusting. The whole circuitry of the servo is built-in inside the motor unit. The shaft adjusts with the help of an electrical signal that the positional feedback system provides.
Here are the components that you can look at when you open a servo motor:
- Dc Motor
- Control Circuit
Working of Servo
When the Motors start to rotate, the potentiometer changes the resistance, and the control circuit starts to regulate the movement of the shaft precisely. For setting the desired position of the shaft, the circuit sent an electric pulse. So if the motor is near the desired position, the shaft turns slowly. Otherwise, the motor runs fast. This servo feature is known as “proportional control,” which makes the servo fast only when required. Due to the proportion control, higher efficiency is achieved.
How to Control the Servo?
Electric pulses are used for controlling the servo. The electric pulse of variable width is used, which is commonly known as Pulse Width Modulation (PVM). The motor makes use of the following:
- Maximum Pulse
- Minimum Pulse
- Repetition Rate
The servo can only turn 90° in either direction. PWM determines the position of the shaft. The length and duration of the pulse control the rotor and turn it into the desired position.
Servo Motors Applications
In the air Industry, servos are used to control surfaces such as rudders, elevators, etc. Since servo motor is small and lightweight, it fits the requirement of the aviation industry.
Food and Pharmaceuticals
The servo is brushless motors that can handle some of the harsh conditions that different industries have to offer. In food industries, the servo has to face the washout and high temperatures repeatedly, and the same goes for the pharmaceutical industries. The servo provides high precision in such a harsh environment, making it a perfect fit for food and pharmaceutical companies.