On 02/19/2016 10:54 AM, Ralph Stirling wrote: > I'm very intrigued by these Inductosyns. I assume > the several hundred mA drive is an AC waveform. > What frequency is used? In general, whatever you want, but for the AD2S1200 chip I use in my converter board, it is 10KHz, sine wave. > Obviously an amplifier is > needed for the drive side. Do you also need an amp > on the sense side? For a transformer-type resolver, they generally have ratios between 1:2 and 2:1, so a little range of excitation levels gets you the required output. Inductosyns have such low turns coupling (the sense windings only cover a small fraction of the spar's winding) plus a big air gap, that the sensed signals are really weak. So, you have to add an amplifier to the sense side. > These appear to be two-phase > (quadrature). Aren't resolvers generally three-phase? > No, resolvers are unrolled control transformers, and are 2-phase (sine and cosine). Selsyns are 3-phase.
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