Siemens Spindle Motor Noise Troubleshooting: Complete Mechanical & Electrical Solutions
Mechanical Troubleshooting and Processing
Bearing problem
Phenomenon: The noise is accompanied by vibration, which may be due to bearing wear, insufficient lubrication or installation offset.
Treatment:
Disassemble the motor to check the status of the bearings, replace the damaged bearings and use the original grease; calibrate the coaxiality between the motor and the load.
Abnormal transmission parts
Coupling: Check the coupling for deformation or wear, replace the flexible coupling to absorb the vibration; Gear/belt: Remove foreign matter from the gear meshing, adjust the belt tension to the specified (usually 5-10N/mm²).
Mounting Hazards
Check whether the torque of motor base fixing bolts is up to standard (refer to Siemens manual, e.g. 1FK7 motor needs 20-25N-m); make sure the cooling fan blades are not deformed or scratching the housing.
Electrical and Parameter Adjustment
Drive parameter optimisation
Execute the one-key automatic optimisation function of SINAMICS drive, the system automatically matches the load inertia; if the noise persists, manually adjust the proportional gain of the speed ring (reduce the KP value by 20%-30%) and the frequency of the trap filter.
Encoder and Signal Processing
Check whether the shielding layer of encoder cable is complete, avoid parallel with the power line (spacing ≥ 10cm); if the alarm A01695 (encoder module replacement prompt), you need to execute the ‘Confirm Hardware Replacement’ through STARTER software and reload the parameters. and reload the parameters.
Power supply interference suppression
Detect the power supply voltage fluctuation range (allow ±10%), install voltage regulator or isolation transformer; use twisted shielded cable and single point grounding (grounding resistance ≤ 4Ω).
Environment and Load Adaptation
Resonance suppression
Set the frequency hopping function through the driver to avoid the resonance frequency band of the motor-load system (e.g. 100-200Hz); add damping devices (e.g. rubber shock pads) at the load end.
Load Matching
Check the load inertia ratio (recommended ≤ 3 times the motor inertia), when exceeding the standard, it is necessary to increase the speed reducer or replace the high-power motor; exclude mechanical jamming (manually rotate the load axis, torque ≤ 10% of the rated value).
Emergency treatment process
Immediate shutdown: if the abnormal noise is accompanied by smoke or violent vibration, cut off the power supply and contact professional maintenance; temporary load reduction: reduce the operating speed to 50% of the rated value, observe whether the abnormal noise disappears.