(a) Consider the motion control system that is shown by the block diagram in Figure P6.37.
(i) Giving examples of typical situations, explain the meaning of the block represented as "Load" in this system.
(ii) Indicate the advantages and shortcomings of moving the motion sensors from the motor shaft to the load response point, as indicated by the broken lines in the figure.
(b) Indicate, giving reasons, what type of sensors you will recommend for the following applications:
(i) In a soft drink bottling line, for online detection of improperly fitted metal caps on glass bottles
(ii) In a paper processing plant, to simultaneously measure both the diameter and eccentricity of rolls of newsprint
(iii) To measure the dynamic force transmitted from a robot to its support structure, during operation
(iv) In a plywood manufacturing machine, for online measurement of the thickness of plywood
(v) In a food canning plant, to detect defective cans (with damage to flange, side seam, etc.)
(vi) To read codes on food packages
Figure P6.37
