Balancing system for e.g. crankshaft - uses difference between two phase reference signals to compensate misalignment between spindle and rotor

摘要

The system allows the rotor to be held in, or rotated into, a position at which balancing is permissible without it having to be aligned with the spindle of the balancing machine. The positions at which the rotor can be balanced are scanned to provide reference signals for determining the angular positions of the rotor imbalance. A phase reference is obtained from the phase reference signal and the required balancing position and the rotor is rotated into the respective permissible balancing position in dependence on the detected imbalance. A second phase reference signal is obtained from the rotation of the spindle with the phase difference between the two phase difference signals used to control the rotation of the rotor into the balancing position.