Automatic digital dynamic balancing machine and method
US4868762A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1987 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Sep 14, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M1/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The balancing machine of the present invention automatically determines the position of unbalance in a rotating part and stops the rotating part with the unbalance position in a predetermined location. Sensors on the bearings holding the rotating part generate signals proportional to the instantaneous unbalance. These signals are filtered and digitized at a sampling rate synchronous with the motor driving the rotation. Two contiguous sets of samples, each set spanning several revolutions of the part, are stored. The X and Y components of the unbalance signal are calculated for each sample set and the actual rotation rate of the part is calculated from the assumed rate and any difference in the phase angle of the unbalance location between the first and second sample sets. These calculations are performed during a calculation interval of predetermined length which follows the sampling. Once this calculation interval has passed and the unbalance location has rotated to the predetermined location a predetermined deceleration of the rotating part is begun. The motor is controlled to decelerate at a predetermined rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.