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Servo motor refers to the motor that controls the operation of mechanical components in a servo system. The servo motor can control the speed and position very precisely, converting the voltage signal into torque and speed to drive the control object. Servo motor rotor speed is controlled by the input signal, and can respond quickly, in the automatic control system, used as an executive component, can be received into the motor shaft angular displacement or angular speed output. Servo motors are divided into DC and AC servo motors. Stepper motor and servo motor are both motion control products, but there are some differences in performance and application.Different control accuracy
The step angle of the two-phase hybrid stepper motor is generally 1.8°, 0.9°, and the step angle of the five-phase hybrid stepper motor is generally 0.72°, 0.36°. The control accuracy of the servo motor is guaranteed by the rotary encoder at the back of the motor shaft.Different low frequency characteristics
Stepper motors are prone to low-frequency vibration at low speeds. The vibration frequency is related to the load condition and the performance of the stepper driver. It is generally considered that the vibration frequency is half of the no-load take-off frequency of the stepper motor. When stepper motors work at low speeds, damping technology should be used to overcome low-frequency vibration phenomena, such as adding a damper to the stepper motor, or using subdivision technology on the stepper driver. Servo motor runs very smoothly and there is no vibration even at low speed.Different moment frequency characteristics
The output torque of a stepper motor decreases with the increase of the speed, and will drop sharply at a higher speed, so its maximum working speed is generally 300-600RPM. The servo motor has a constant torque output, it can output a rated torque within its rated speed (generally 2000RPM or 3000RPM), and a constant power output above the rated speed.Different operating performance
Stepper motor control is open loop control. If the starting frequency is too high or the load is too large, it is easy to lose steps or stall. When the speed is too high, it is easy to overshoot. Therefore, to ensure its control accuracy, increase and decrease speed problems should be handled well. The servo drive system is a closed-loop control. The driver can directly sample the feedback signal of the servo motor encoder. The position loop and the speed loop are formed inside. Therefore, the servo motor will not lose steps or overshoot, and the control performance is more reliable.Different speed response performance
It takes 200 to 400 milliseconds for a stepper motor to accelerate from a standstill to a working speed. The acceleration performance of the servo motor is better, it can be used in control situations that require fast start and stop.Servo Motor Applications
Machinery industry: CNC punching machines, bending machines, robots, PLC program controllers, various types of automobile testing equipment, assembly equipment, welding equipment.
Printing industry: printing machine, offset printing machine, laser phototypesetting, proofing equipment, automatic punching machine, inkjet printing machine; folding machine, paper cutter, sewing machine, binding machine, automatic Corrugated cardboard (box) production line, automatic paper feeding and gluing machine, shaftless high-speed offset printing machine, etc.
Medical industry: monitor, B-ultrasound, CT control box, electrocardiogram (electroencephalogram) tester, X-ray machine, slicer, hemodialysis machine, temperature controller, etc.
Food industry: sterilization machine, labeling machine, sealing machine, packaging machine, coffee machine, etc.