The servo motor can control the speed, the position accuracy is very accurate, and the voltage signal can be converted into torque and speed to drive the control object. The rotor speed of the servo motor is controlled by the input signal, and can respond quickly, in the automatic control system, used as an actuator, and has the characteristics of small electromechanical time constant and high linearity, which can convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. It is divided into two categories: DC and AC servo motors, and its main feature is that there is no rotation phenomenon when the signal voltage is zero, and the speed decreases uniformly with the increase of torque.
Routine maintenance work of servo motors
(1) Since the output uses contactors, when the equipment is out of operation, the main contactor and other auxiliary contacts of the output cabinet should be checked frequently, and the dynamic and static contacts of each contactor should be carefully observed for arcing, burrs or surface oxidation and unevenness, and the corresponding dynamic and static contacts should be replaced if such problems are found, so as to ensure that their contacts are safe and reliable, and there will be no phase imbalance.
(2) Regularly inspect the inverter, clean and remove dust, focusing on the rectifier, inverter part and control cabinet, and remove the dust from the air inlet and upper air outlet of the inverter.
(3) During normal operation, the daily inspection of the inverter should be carefully done every day, and the inspection content mainly includes: whether the operation indication of the inverter is far away and whether it is accurate, and whether the operation mode and requirements meet the operating parameters of the inverter. Whether there is a report on whether the fan in the inverter cabinet is running normally, whether the reactor in the inverter cabinet is overheated or there is electromagnetic noise, whether there is vibration or abnormal sound in the inverter. If any of the above unusualness is found, it should be dealt with in a timely manner if conditions permit.
(4) During the overhaul (generally once every 4 years), the following inspections should be carried out: a comprehensive inspection of the rectifier and inverter, DC transmission and fast melting, and the capacitor should be replaced one by one if it is burned and replaced one by one, whether the capacitor is bubbling or deformed, if there is a rectifier and inverter part of the diode, G Ding O with a multimeter for electrical testing, determine its forward and reverse resistance value, to see whether the resistance value between the poles is normal, and whether the consistency of the same model of device is good, If necessary, replace the second and carefully check whether the terminal row of the control loop is aging and loose, and whether the connection of each connecting wire is firm.
Check whether the AC and DC busbars (including the incoming or output lines of the inverter) in the inverter are firmly installed, check whether the AC and DC busbars (including the inlet or output lines of the inverter) are deformed, corroded and oxidized, whether the screws at the busbar connections are loose, whether the fastening screws at the installation fixing points are loose, and whether the insulating sheet or insulating column for fixing is aging, cracked or deformed.
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