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Provide high-quality and efficient servo motors

  • Working principle of servo motor

  • From:Intell motor  Times:2022-11-29
  • Servo mainly relies on pulses for positioning, which can be understood as follows. 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 angle of rotation. This corresponds to the pulses received by the servo motor, or is called a 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. This allows for precise control of the motor''s rotation, achieving precise positioning, which can reach 0.001mm. DC servo motors are divided into brushed and brushless motors. Brushless motors have low cost, simple structure, large starting torque, wide speed range, easy control, and require maintenance. However, they are easy to maintain (replacing carbon brushes), generate electromagnetic interference, and have environmental requirements. Therefore, it can be used in cost sensitive general industrial and civil applications. Brushless motors have small size, light weight, high output, fast response, high speed, small inertia, smooth rotation, and stable torque. The control is complex, 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, has high efficiency, operates at low temperatures, has minimal electromagnetic radiation, and has a long lifespan. It can be used in various environments. 2. AC servo motors are also brushless motors, divided into synchronous and asynchronous motors. Currently, synchronous motors are generally used in motion control, which have a large power range and can achieve high power. Large inertia, low rotational speed, and rapidly decreasing with increasing power. Therefore, it is suitable for applications that operate smoothly at low speeds. 3. The rotor inside the servo motor is a permanent magnet, and the U/V/W three-phase electricity controlled by the driver forms an electromagnetic field. The rotor rotates under the action of this magnetic field. At the same time, the motor''s built-in encoder feedbacks a signal to the driver, and the driver compares the feedback value with the target value to adjust the angle of rotor rotation. The accuracy of the servo motor is determined by the accuracy of the encoder (number of lines)
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