초록 ▼

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 instantaneo

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.

대표청구항 ▼

A balancing machine for automatically determining the unbalance location of a rotating part and automatically stopping said part with the unbalance location in a predetermined position, comprising: a stationary frame; bearing means for rotatably supporting the rotating part to be balance on said sta

A balancing machine for automatically determining the unbalance location of a rotating part and automatically stopping said part with the unbalance location in a predetermined position, comprising: a stationary frame; bearing means for rotatably supporting the rotating part to be balance on said stationary frame; drive motor means for rotating the rotating part; transducer means disposed at said bearing means for sensing the rotary unbalance of the rotating part and for producing an electrical unbalance signal proportional to the rotary unbalance; speed control means connected to said drive motor means for controlling the nominal speed of rotation of the rotating part by said drive motor; speed calculation means connected to said transducer means for calculating the actual speed of rotation of the rotating part from said electrical unbalance signal; deceleration time calculation means connected to said transducer means and said speed calculation means for calculating the time to being to decelerate said rotating part at a predetermined deceleration rate to stop the rotating part with the unbalance location in a predetermined position, said deceleration time calculation means determining the deceleration time from said electrical unbalance signal and said calculated actual speed of rotation; and deceleration means connected to said deceleration time calculation means and said speed control means for decelerating said drive motor means at said predetermined deceleration rate starting at said time calculated to begin to decelerate the rotating part.