New from austriamicrosystems is the AS5311, a Hall-effect linear magnetic encoder offering sub-micron resolution. For linear motion sensing, a multipole magnetic strip is used and for rotary motion sensing, the magnetic strip is replaced by a multipole magnetic ring. For applications like this, an incremental output with a resolution of 10 bits per pole pair and a travelling speed up to 650 mm per second is available. Using for example, a multipole magnetic ring with a diameter of 41,7 mm, a resolution of 16 bits can be achieved. In conjunction with a 2 mm pole-pair magnetic strip, the AS5311 provides a 1,95 micrometre resolution signal at its incremental output and a 488 nanometre resolution signal at its serial output.
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