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How Hall Effect Encoders Work

Mar 27, 2017

Hall effect encoders use magnetic phased arrays that contain hall sensor elements arranged in a pattern to match a magnetic wheel. A signal is produced as the sensor passes over the magnetic field which is then interpolated to the desired resolution. This magnetic phased array technology is now available in an IC Chip which integrates both the sensor and the processor in the same chip which considerably decreases the chip count and pc board complexity for a robust, compact, easily manufacturable component. Magnetic Hall Phased Array technology represents the leading edge magnetic encoder technology today.

Diagram: Inside a magnetic hall effect encoder, a Hall-array sensor averages the signal over multiple detectors to deliver robust, high-resolution performance that is insensitive to misalignment, shock, and vibration.

The innovation of phased array technology has dramatically improved optical encoder technology. Similarly, magnetic phased array systems have benefited in the same way increasing resolution, compactness and reliability of magnetic encoder systems. Their designs spread data capture across multiple detectors, averaging out errors and increasing sensitivity.