Method and device for measuring the repeatable and non-repeatable runout of rotating components of a spindle motor

A device for measuring a repeatable runout and a non-repeatable runout of a rotating component of a spindle motor, comprising:

• at least one probe located in close proximity to an outer perimeter of the rotating component of the spindle motor, said at least one probe being configured to measure changes in a distance between said probe and an outer perimeter of the rotating component depending on an angle of rotation and to generate a first test signal and a second test signal based on said measured changes in said distance;
• means for recording said first test signal;
• an electromechanical actuator supporting said at least one probe, said electromechanical actuator being configured to adjust the distance between the probe and the outer perimeter of the rotating component depending on said recorded first test signal;
• and
• an evaluation unit storing said first and said second test signals and determining the repeatable runout and the non-repeatable runout from the stored test signals.

A device for measuring a repeatable runout and a non-repeatable runout of a rotating component of a spindle motor, comprising:

• a first probe, configured to generate a first test signal depending on changes in a distance between said first probe and said rotating component of said spindle motor;
• an electromechanical actuator supporting a non-repeatable runout probe, said electromechanical actuator being configured to adjust the distance between said non-repeatable runout probe and the rotating component depending on said first test signal, said non-repeatable runout probe being configured to generate a second test signal;
• and
• means for determining the repeatable runout from said first test signal and the non-repeatable runout from said second test signal,
• wherein said non-repeatable runout probe is one of said first probe and a second probe.