Measuring and testing – Rotor unbalance – Dynamic
Patent
1991-11-06
1993-05-11
Chapman, John E.
Measuring and testing
Rotor unbalance
Dynamic
G01M 122
Patent
active
052091163
ABSTRACT:
The present invention relates to an unbalance point positioning method and an apparatus therefor, which carry out a positioning operation with high precision and within a short time by using, as a trigger, an unbalance phase signal due to revolution of an unbalance point of a measured object, and effecting deceleration control through feedback control with a voltage corresponding to a rotational frequency of the measured object.
The apparatus includes means for rotating the object at a high speed and for determining the amount as well as the angular position of the unbalance of the object. Once the angular position is determined, this information is used to trigger a predetermined deceleration signal, which smoothly and continuously decelerates the measured object until the object is stopped with the unbalance point at a preselected position. A gradual deceleration curve, generated using a resistor and capacitor circuit, is used to minimize slippage between the rotating object and the drive mechanism. In order to further reduce the slippage between the rotating object and the drive mechanism while smoothly stopping the object, a feedback signal based on the actual rotation speed of the object is subtracted from the predetermined deceleration signal so that a negligible amount of slippage is achieved.
REFERENCES:
patent: 3017773 (1962-01-01), Lash et al.
patent: 4419894 (1983-12-01), Matumoto
patent: 4741210 (1988-05-01), Maus
patent: 4868762 (1989-09-01), Grim et al.
patent: 4980621 (1990-12-01), Muller
Chapman John E.
Denshi Seiki Kogyo Kabushiki Kaisha
Greigg Edwin E.
Greigg Ronald E.
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