Non-repeatable run-out measuring instrument using encoder signal

Details Non-repeatable run-out measuring instrument using encoder signal Non-repeatable run-out measuring instrument using encoder signal

1993-04-08

1995-02-28

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324177, G01R 104

Patent

active

053941020

ABSTRACT:
The specification discloses an NRR (Non-Repeatable Run-out) measuring instrument for measuring the NRR of the rotating object motor to be measured without installation of a special attachment such as an encoder. In the NRR measuring instrument of the invention, encoder signals are obtained from back-electromotive forces developed at driving coils of the rotating object motor by removing spike noise thereof by LPF 30U, 30V, 30W and reformed by a wave shaping circuits 32U, 32V, 32W. The encoder signals together with digitized displacement signals generated by noncontact displacement measuring instrument 14 through A/D 28 are inputted to a CPU 34. In the CPU 34, sampled data are acquired from the digitized displacement signals being triggered by the encoder signals and the NRR is calculated based on the sampling data.

REFERENCES:
patent: 4784497 (1987-02-01), Katsumura
patent: 5200675 (1993-04-01), Woo
patent: 5231338 (1993-01-01), Bulgarelli et al.

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