Announcement

Collapse
No announcement yet.

Resolvers.. Still a viable with current technology..

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Resolvers.. Still a viable with current technology..

    Working on getting a 70's vintage nc lathe running I have also been playing with resolvers. Granted there are comercial solutions that work better (pico and mesa)

    Last edited by skunkworks; 12-06-2021, 01:20 PM.

  • #2
    part 2

    Comment


    • #3
      Resolvers I have are from aviation and designed for 400hz AC.

      Comment


      • #4
        These are rated at 400hz also. They seem to work good at 2khz.

        Originally posted by RB211 View Post
        Resolvers I have are from aviation and designed for 400hz AC.

        Comment


        • #5
          But you must feed them that signal. There exists resolver motors and others. So apparently you can drive something 1:1 electrically.

          Comment


          • #6
            Analog Devices makes resolver to digital ICs. Not too expensive and handles excitation and A to D. They even have simulated quadrature encoder outputs: https://www.analog.com/en/products/ad2s1210.html

            Comment


            • #7
              Resolvers were used in early CNC M/C's but as mentioned they have inertia and also require excitation etc.
              The modern replacement is the quadrature encoder used with the direct photo-LED sine wave output before it is squared up as in the typical quadrature versions.
              The co-tangent calculation is the same result as the resolvers were.
              .I recall the first optical quadrature encoders/scales that had an incandescent lamp for use in the read head, every time you replaced the bulb, the resulting sine wave phasing had to be done with a scope using a Lissajous figure to set the 90deg offset. !!

              Comment

              Working...
              X