Why does the aircraft model servo have three lines?
Among aircraft model enthusiasts, the servo is an indispensable component. It is responsible for controlling the steering, lifting and other actions of the model. Many beginners may be curious: Why do servos usually have three lines? What is the function of each of these three lines? This article will analyze the three lines of the servo and their functions in detail, and help readers better understand them through structured data.
1. Basic functions of the three lines of the steering gear
The three lines of the steering gear are usuallyPower cord (VCC),Ground wire (GND)andSignal line (Signal). The following is the specific function of each line:
| Thread color | Name | Function |
|---|---|---|
| red | VCC (power cord) | Provides the voltage required for the servo to work, usually 5V or 6V |
| black or brown | GND (ground wire) | Form a current loop to ensure the normal operation of the circuit |
| yellow or white | Signal (signal line) | Receive control signals to determine the rotation angle of the steering gear |
2. Working principle of steering gear
The core of the steering gear is a small motor and feedback control system. When the signal line receives the PWM (Pulse Width Modulation) signal, the servo will adjust the motor rotation angle according to the pulse width of the signal and feedback position information through the internal potentiometer to achieve precise control.
The following are the key steps for steering gear work:
| steps | Description |
|---|---|
| 1. Receive signal | The signal line receives the PWM signal from the remote controller or flight controller. |
| 2. Analyze signals | The internal control circuit of the steering gear analyzes the pulse width and determines the target angle. |
| 3. Drive motor | The motor rotates according to the target angle and drives the output shaft |
| 4. Feedback adjustment | The potentiometer detects the current position, compares it with the target angle and corrects it |
3. Why three lines instead of more?
The three-line design of the steering gear is the result of optimization:
1.Simplify the circuit: Three lines are enough to complete the power supply and control functions, reducing wiring complexity.
2.Standardized interface: Most servos use the same interface to facilitate compatibility with different devices.
3.cost control: Reducing the number of cables can reduce production costs.
4. Frequently Asked Questions
Q: What will happen if the three wires of the servo are connected reversely?
A: If the power cord and ground wire are connected incorrectly, the servo may be burned; if the signal wire is connected incorrectly, normal control will not be possible.
Q: Are the servo wire colors of different brands consistent?
A: Not exactly the same, but usually red is VCC, black/brown is GND, and yellow/white is Signal.
5. Summary
The three lines of the servo are responsible for the functions of power supply, grounding and signal transmission respectively, and each one is indispensable. Understanding the functions of these three wires will help you connect and use the servo correctly and avoid damage caused by incorrect wiring. For model aircraft enthusiasts, mastering the working principle of the steering gear is an important step in improving control skills.
I hope that through the analysis of this article, you can have a clearer understanding of the three lines of the aircraft model steering gear!
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