Step Transductor for PM Hybrid Stepping Motor

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Abstract
In this paper an original implementation of the step transductor for PM hybrid stepping motor is presented. This implementation is based upon the measurement of the back emf voltage. The difficulties which arise are not due ananalogical circuits (with OP-AMP), but to the switching noises (spikes) found in the back emf voltage which has been measured. Tnise spikes have eliminated by means of some timer circuits. With this structure, the detent position sensing of the phases with an error less than 5% could be obtained. To decrease the number of IC's used, some timing functions can be implemented in software on a microcomputer-on-a-chip (e.g. 8746). The same microcomputer can be used also as a controller for the closed-loop stepping motor system.

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