A Study on Measurement for Circular Runout of Giant D.C.Motor’s and Generator’s for Commutator

Giant D. C. motor and generator are widely used in steel plants, but circular runout of their commutator often causes harmful electric spark. In order to solve this problem the amount of circular runout should be precisely detected and measured. However, it is dfficult to attain by conventional measuring method.
In this paper, a new measuring system with a non-contacted edd-cur-rent transducer and a TP801 microprocessor is presented. It has good dynamic response and preciseness, data can be measured, processed and recorded simultaneously.
The measuring system consists of two parts: analogue measuring and data processing.
The function of the measuring system as well as the principle of software and hardware are discribed. The A/D coverting speed is also discussed.