Design of a Micro-stepping Motor Locked-Rotation Detection Chip

摘要

The locked-rotation of the energy meter's code-wheel-driven stepping motor could miss the counting of the used electricity. Therefore, we design a special chip to detect the locked-rotation condition of the code-wheel-driven stepping motor of an energy meter. On the basis of analyzing the pulse-signal-width of the stepping motor's detecting coils, we adopt the module interface integrated circuit in the chip to detect the pulse count for the locked-rotation. The simulated circuit, mainly the comparator, is to make digital exchange for the signal of the detecting coils. This kind of detecting principle allows more tolerance, about -23% and +45%, for the clock error in the detecting system. The detecting system can stably and reliably work in the energy meter in a long time. The chip, made with the 0.5um CMOS technique, has a lower cost compared with the plan to detect the locked-rotation with the microprocessor, and can be utilized in large quantities. The chip has passed the admittance test for the energy meter enterprises.