Plastic / Metal Gear Micro Servo Digital RC Helicopter Car Robot

SG90/MG90/SG92R/MG995/MG996R

The steering gear is a position (angle) servo driver. A potentiometer (or other angle sensor) is installed inside to detect the rotation angle of the output shaft. The control board can accurately control and maintain the angle of the output shaft according to the information of the potentiometer. This DC motor control method is called closed-loop control, so the steering gear is more accurately called servo motor.

The rotation of the steering gear is controlled by PWM pulse, and the steering gear rotates at a specific angle after each pulse. At the same time, the steering gear is a closed-loop control system. Because the servo motor itself has the function of sending pulses, the servo motor will send a corresponding number of pulses every time it rotates an angle. In this way, it echoes the pulses received by the servo motor, or called closed-loop. In this way, the system will know how many pulses are sent to the servo motor and how many pulses are received back, so that the rotation of the motor can be controlled accurately, So as to achieve accurate positioning. It is widely used in aircraft models, remote control toys, robots, PTZ and other occasions that need to control the angle.

The difference between 180-degree steering gear and 360-degree steering gear:

The commonly used and commonly used steering gear generally refers to the steering gear with 180 degrees, that is, the steering gear with controllable rotation within 0-180 degrees. Give such steering gear a specific PWM signal, and the steering gear will turn to a specific angle within 0-180 degrees. When a specific PWM signal is given to the 360-degree steering gear, the steering gear will rotate at a specific speed, and the rotation direction can also be controlled, but it cannot be controlled to rotate to a specific angle, similar to the stepless speed reduction motor, but unlike the speed reduction motor, the 360-degree steering gear is closed loop control, and the speed control is stable.

The control of the steering gear generally requires a time base pulse of about 20ms. The high level part of the pulse is the angle control pulse part within the range of 0.5ms-2.5ms, with a total interval of 2ms.