Servo mainly relies on pulses for positioning. Basically, it can be understood that when a servo motor receives one pulse, it will rotate the corresponding angle of one pulse to achieve displacement. Because the servo motor itself has the function of emitting pulses, it will emit a corresponding number of pulses for each rotation angle. This corresponds to the pulses received by the servo motor, or is called a closed loop, The system will know how many pulses are sent to the servo motor and how many pulses are received back at the same time, so that it can accurately control the rotation of the motor and achieve precise positioning, which can reach 0.001mm. DC servo motors are divided into brush and brushless motors. Brushed DC servo motor - The motor has low cost, simple structure, large starting torque, wide speed range, easy control, and requires maintenance. However, maintenance is convenient (replacing carbon brushes), which can generate electromagnetic interference and have environmental requirements. Therefore, it can be used in cost sensitive general industrial and civil applications. Brushless DC servo motor - The motor has small size, light weight, high output, fast response, high speed, small inertia, smooth rotation, and stable torque. It is easy to achieve intelligence, and its electronic commutation method is flexible, which can be square wave commutation or sine wave commutation. The motor is maintenance free and does not have carbon brush loss. It has high efficiency, low operating temperature, low noise, low electromagnetic radiation, long service life, and can be used in various environments
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