When servicing spindle motors, in addition to an excellent knowledge of bearings (their operation, run-out, preload, lubrication, temperature loads, radial and axial forces, etc.), it is essential to know how to dynamically and finely balance the rotor of the motor. The preparation of the spindle motor components themselves is extremely important.

Tolerances are measured in thousandths of a millimetre for all motor types. The work therefore requires more precise and sophisticated handling, and special equipment, as conventional micrometers are not precise enough to measure. The force and pressure gauges for bearing preload must also be suitable and calibrated, and require a significant financial investment.

At Matris, we have all the necessary equipment and know-how to provide a quality service in the shortest possible time.

Each spindle motor is also tested on completion to check bearing performance, motor temperature behaviour and winding. At the end of the service procedure, we always hand over the documentation recording all the measurements, as well as the fine and dynamic balancing reports.

Classic spindle motor servicing includes:

  • visual inspection,
  • disassembling the motor,
  • fault identification,
  • measurement of tolerances of all adjacent and abutting surfaces,
  • checking power electrical connections,
  • checking the electrical signal connections,
  • encoder/sensor test,
  • encoder/sensor setting,
  • resistance measurement with the Schleich MTC2,
  • cleaning of components,
  • an overview of the components,
  • bearing seat measurements,
  • changing bearings,
  • static balancing of the rotor,
  • bearing preload,
  • servicing the forced cooling fan,
  • assembly,
  • fine balancing of the spindle,
  • motor testing,
  • Bearing break-in (5 hours),
  • Final report.