Magnetic rotary encoder system.

摘要

A magnetic rotary encoder system includes a magnetoresistive sensor (10) having a magnetoresistive element array (R1-R6) which is selectively connected to accommodate a number of different diameter encoder wheels (12) each wheel of which contains a different number of pieces of magnetic information recorded at corresponding different wavelengths. A sensing and conditioning circuit (30) is coupled to the magnetoresistive sensor and detects changes in resistance of the magnetoresistive elements when a magnetic field produced by a magnetic pole causes the magnetoresistive resistance to drop. Ouput signals are provided in quadrature to increase the resolution of the system.