Comments on: Resolvers ain’t dead

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By: Tero

Tero — Mon, 25 Mar 2013 21:20:43 +0000

Not sure if excitation signal plays that large role. At least resolver output seems to follow input waveform shape regardless whether input is sinusoidal or square. More important factors are the synchronized sampling point and software compensations of mismatching amplitude of secondaries.

Meanwhile, I got lead time for enclosures: 5 weeks. That may be quite accurate estimation of availability of the first drives!

By: lubchi

lubchi — Thu, 21 Mar 2013 23:17:41 +0000

Hi!
The resolution and the precision of the resolver depends on the quality of the excitation signal (it’s nothing more than a rotating transformer). A resolution of up to 16 bit is possible, but it’s not the effective precision. Anyway 12 bit is an achievable precision especially using a good sigma/delta ADC.
The advance of this cheap and robust position sensor is that it’s a single turn absolute encoder – if it has only one pole pair, i.e. one period per revolution.
The inaccuracy comes mostly from the possible eccentricity between the rotor and stator which results in a nonlinearity inside the revolution. As well as because af precise synchronization of the sample time to the excitation frequency. is needed.
If a RDC is used, you can calculate with a precision of the positioning loop about 11-12 bit, which is enough for the most of the machining tools using screw drives.
A better explanation could be found here http://www.optoresolver.com/help/tutorials/resolver_v_encoder.htm

By: Tero

Tero — Wed, 20 Mar 2013 19:49:27 +0000

Precision depends of RDC specs and resolver quality. With Argon I expect to see about 12 bits resolution (abt 1/4000 of revolution), but there will be a post about that once I have chance to test it. Anyway they should be definitely suitable for machine tools.

No production date yet confirmed but PCB assembly shouldn’t take longer than ~1 month. I don’t have estimate of enclosures yet.

By: Johann

Johann — Tue, 19 Mar 2013 08:58:01 +0000

hi Tero
what is the accuracy of this type of encoder ?
Can be used for the control of axis machine tools ?

ps: Have you news of the production of the first ARGON ?

Greetings