Resolver/synchro feedback support in the next FW

I have been testing a resolver feedback couple of days now for Argon and it seems promising already! It’s working very well in the prototype code and it provides position resolution of 8192 counts per revolution.

As resolver is analog sensor, it’s sensitive to noise sources such as unshielded motor leads but this doesn’t seem to be huge problem. Motor will make some hissing sound but otherwise it “feels” just like encoder. However unlike incremental encoders, resolver is absolute position sensor (meaning that the instantly drive knows absolute motor angle, not just the amount turned from the beginning of measure). The benefit of this is elimination of the need of Hall sensors and/or phasing during drive power-on initialization.

3 thoughts on “Resolver/synchro feedback support in the next FW

  1. hi tero
    when you talk about 8192 pulse per revolution for maximum resolusion
    this is reported for a single encoder A or B, or counting the number of signals after decoding quadrature x4

    example: for a Heidenhain encoder 1000 ppr
    there are 1000 pulse turns on the signal A and 1000 for B
    with quadrature decoding software count is multiplied by 4
    This position gives 4000 rpm

    the 8192 counts it is befor or after quadrature decoding ?

  2. 8192 is “counts per revolution” so it equals the real resolution after 4x if it would be an encoder.

    8192 is based on analog noise limit. It could be much higher as well but it would not provide any real benefit due to analog signal noise.

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