Inductosyn has a major cost advantage over Accupins. It is a copper film bonded
to a steel backplate. It is a photo etch process like a circuit board.
The slider is the same process with a thin foil protection over it. The slider
provides sine and cosine, and the scale reads displacement. They use a varnish
to protect the copper left after the etching.
Scott
On Tuesday, January 25, 2022, 11:55:13 PM CST, Lawrence Glaister
<[email protected]> wrote:
Very cool Sam. It looks like the pin rail may be reproducible, but do
you have any idea what the coil pickup structure is? Probably 3 coils...
excitation, and the 2 quadrature phase or possibly many coils on a 1."
spacing. The concept is very interesting if we could reproduce sensors
like this at a reasonable cost. A similar product was call inductosyn I
believe.
https://www.maccon.com/rotary-linear-encoders/magnetic-encoders/inductosyn.html
http://what-when-how.com/electric-motors/linear-and-rotary-inductosyns-electric-motors/
I have seen a similar sensor that used ball bearings in a tube.
http://www.newall.com/technology/ this seems to show a good cutaway view.
One idea I had was to try and use a ground ball screw as the sensor rail
with magnetic pickups on several of the threads. Thus the rod providing
the positioning would also provide position feedback of the nut (sensor
coils ride on the nut). A slightly different idea (and probably less
precise) is to use a rack as the sensor.
With optical encoders being so cheap these days, its probably just an
academic interest, but any ideas you have on the pickup coil design
would be very interesting.
cheers
Lawrence VE7IT
Nanoose Bay BC, Canada
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