How to deal with such problem when servo motor meets in work

How to deal with such problem when servo motor meets in work

(1) Motor channeling: in the feed appears channeling phenomenon, speed measurement signal is unstable, such as encoder cracks; Poor contact of wiring terminals, such as loose screws, etc. When channeling occurs in the reversing moment from the positive direction and the opposite direction, it is generally due to the reverse clearance of the feed transmission chain or the gain of the servo drive is too large;

(2) Motor creep: most of it occurs in the acceleration section of starting or at low speed feed, which is generally caused by the poor lubrication of the feed transmission chain, low gain of the servo system and excessive external load. In particular, attention should be paid to the coupling of servo motor and ball screw, due to the loose connection or the coupling itself defects, such as cracks, resulting in the rotation of ball screw and servo motor is not synchronous, so that the feed movement is fast and slow; 

(3) Motor vibration: when the machine tool is running at high speed, there may be vibration, and then there will be overcurrent alarm. The machine tool vibration problem generally belongs to the speed problem, so we should look for the speed loop problem;

(4) Motor torque reduction: when the servo motor is running at high speed from the rated lock-rotor torque, it is found that the torque will suddenly decrease, which is caused by the heat dissipation damage of the motor winding and the heating of the mechanical part. At high speed, the temperature rise of the motor increases. Therefore, the load of the motor must be checked before the correct use of the servo motor;

(5) Motor position error: When the servo shaft movement exceeds the position tolerance range (KNDSD100 factory standard setting PA17:400, position error detection range), the servo drive will appear “4″ position error alarm. The main reasons are: the tolerance range of the system is small; Improper gain setting of servo system; Position detection device is contaminated; The accumulated error of the feed transmission chain is too large;

(6) The motor does not rotate: in addition to connecting the pulse + direction signal from the CNC system to the servo driver, there are also enable control signals, which are generally DC+ 24V relay coil voltage. Servo motor does not rotate, the commonly used diagnosis methods are: check whether the CNC system has pulse signal output; Check whether the enable signal is connected; The LCD screen is used to observe whether the input/output state of the system meets the starting condition of the feed shaft. Confirm that the servo motor with electromagnetic brake has been opened; The drive is faulty. Servo motor failure; Servo motor and ball screw coupling coupling failure or key off.