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Introduction
Servomotor is a position control rotary actuator. It mainly consists of housing, circuit board, core-less motor, gear and position
sensor. The receiver or MCU outputs a signal to the servomotor. The motor has a built-in reference circuit that gives out reference signal, cycle of 20ms and width
of 1.5ms. The motor compares the acquired DC bias voltage to the voltage of the potentiometer and outputs a voltage difference. The IC on the circuit board will
decide the rotate direction accordingly and drive the core-less motor. The gear then pass the force to the shaft. The sensor will determine if it has reached the
commanded position according to the feedback signal. Servomotors are used in control systems that requires to have and maintain different angles. When the
motor speed is definite, the gear will cause the potentiometer to rotate. When the voltage difference reduces to zero, the motor stops. Normally, the rotation
angle range is among 0-180 degrees.
Servomotor comes with many specifications. But all of them have three connection wires, distinguished by brown, red, orange colors(different brand may have
different color). Brown one is for GND, red one for power positive, orange one for signal Line.
The rotate angle of the servo motor is controlled by regulating the duty cycle of the PWM(Pulse-Width Modulation) signal. The standard cycle of the PWM signal
is 20ms（50Hz）. Theoretically, the width is distributed between 1ms-2ms, but in fact, it's between 0.5ms-2.5ms. The width corresponds the rotate angle from 0° to
180°. But note that for different brand motor, the same signal may have different rotate angle.
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