The electric motor encoder in the drive processes external control signals to adjust the motor's operating state, enabling smooth starting, speed regulation, and braking through a precise control algorithm. By varying the duty cycle or analog value of the PWM signal, the motor's speed can be tailored for different applications. The electric motor encoder also protects against over-current, over-voltage, and under-voltage to safeguard against motor damage in abnormal conditions. In summary, the motor encoder controls motor operations, adjusts speed via PWM modulation, and ensures reliable performance across various applications.