Measuring and testing – Rotor unbalance – Dynamic
Patent
1993-06-11
1994-07-19
Williams, Hezron E.
Measuring and testing
Rotor unbalance
Dynamic
G01M 122
Patent
active
053298144
ABSTRACT:
The unbalance of a body (10) to be balanced is indicated in a polar co-ordinate system (52) on a screen (50) of a cathode ray tube (48) by means of a first visible mark (60). The body (10) to be balanced may be rotated by a drive motor (20) by means of a belt (22). A pulse generator (30), producing trains of pulses that are relatively phase displaced by a quarter of a period, is coupled to the drive motor (20). A computer (34) generates a position-indicating signal from the pulse trains, and a reference signal is produced by a reference mark on the body (10) to be balanced and obtained from a pick-up device (28). A position-indicating radial finger (68), which is a second visible mark and rotates on the screen (50) in phase locked manner with the body (10) to be balanced, is obtained from the position-indicating signal. When the position-indicating radial finger (68) coincides with the first visible mark (60), the unbalanced body (10) is positioned in the desired working position. It is possible to depict on the screen (50) angular positions of unbalance even though the rotation of the body (10) to be balanced is not phase-locked with the rotary drive by the motor (20), because, unlike the prior art which merely counts pulses, the respective ratios of the number of pulses generated by movement of the body (10) from the reference position thereof to sequential momentary positions thereof in relation to the number of pulses in a complete revolution of the rotating body (10) to be balanced is determined and used instead.
REFERENCES:
patent: 3835712 (1974-09-01), Muller
patent: 4046017 (1977-09-01), Hill
patent: 4160384 (1979-07-01), Guyot et al.
patent: 4214481 (1980-07-01), Reutlinger
patent: 4298948 (1981-11-01), Davis
patent: 4464934 (1984-08-01), Giers
patent: 4475393 (1984-10-01), Reutlinger
patent: 4868762 (1989-09-01), Grim et al.
patent: 5089969 (1992-02-01), Bradshaw et al.
Betz Jurgen
Heydt Peter
Kissinger Jurgen
Brock Michael J.
Dr. Reutlinger and Sohne GmbH & Co. KG
Williams Hezron E.
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