What are the reasons for the vibration of the servo electric batch? Let's take a look at it.
1. Vibration caused by mechanical structure is divided into the following two conditions:
(1) No-load chattering:
① The motor has a weak foundation, poor rigidity or not tightly fixed.
②The blades of the electric fan are damaged, destroying the mechanical balance of the rotor.
③The crankshaft is bent or cracked. It can be solved by tightening screws, replacing electric fan blades, and replacing crankshafts.
(2) If the vibration occurs after loading, it is generally caused by the fault of the transmission device, and the following defects can be judged:
①Unbalanced rolling of belt wheel or coupling.
②The center line of the coupling is inconsistent, so that the motor does not coincide with the driven mechanical axis.
③Unbalanced drive belt joints. It can be solved by proofreading the transmission device to balance it.
2. Vibration caused by faults of the servo system's compensation board and servo amplifier:
The sudden power failure during the motor movement causes a lot of vibration, which is related to the incorrect setting of the BRK terminal of the servo amplifier and the setting parameters. The acceleration and deceleration time constant can be increased, and the PLC can be used to slowly start or stop the motor so that it does not vibrate.
3. Vibration caused by the speed loop problem:
The speed loop integral gain, speed loop proportional gain, acceleration response gain and other parameters are incorrect. The greater the gain, the greater the speed, the greater the inertial force, the smaller the error, and the easier it is to produce vibrations. Setting a small gain can maintain the speed response, and it is not easy to produce vibration.
4. Vibration caused by load inertia:
Problems with the guide rail and screw lead to an increase in load inertia. The rolling inertia of the guide rail and the lead screw has a great influence on the rigidity of the servo motor transmission system. Under fixed gain, the larger the rolling inertia and the greater the rigidity, the more likely it is to cause the motor to vibrate; the smaller the rolling inertia, the lower the rigidity, and the less likely the motor to vibrate. . The rolling inertia and load inertia can be reduced by replacing the guide rails and screw rods with smaller diameters so that the motor does not vibrate.
5. Vibration caused by electrical parts:
(1) The brake is not turned on, which is caused by factors such as instability of the reaction voltage. Check whether the brake is turned on, control the zero servo function by adding the encoder vector, and select the torque reduction method to output a certain torque to solve the chatter. If the response voltage is abnormal, first check whether the oscillation period is related to the speed. If it is, check whether the connection between the main shaft and the main shaft motor is faulty, whether the main shaft and the pulse generator installed at the end of the AC main shaft motor are damaged, etc. If it is irrelevant, You should check whether the printed circuit board is faulty, and you need to check the circuit board or readjust it.
(2) The sudden vibration of the motor during operation is mostly caused by the lack of phase. The focus should be on whether the fuse melt is blown, whether the switch is well touched, and whether there is electricity in each phase of the power grid.
