Does anybody have knowledge about Resolver in Vibration

[scot30]

Hy all,

I have a problem with a Resolver (angle measurement device) during vibration testing. Had anybody any experience in testing resolvers? The problem was that during high vibrations (10g and 50-1000Hz) the Resolver failed, whilst the cosine output changed the amplitude very fast to a high value, but the sine output stayed at the right value....
Please help me.

Thanx

 

[ajenkins]

FWIW,

Have you checked the wiring? IME, problems like this are often caused by a poor soldering job or an intermittent wire (broken but still contacting while in a low-stress environment) During the ten years I worked for NASA, I experienced enough of these at the hands of sloppy technicians that it became the first thing I check when there's vibration or shock involved.

aj

 

[ajenkins]

Oh, forgot one other possibility worth investigating. There is also the potential for wire shorting. High-vibe/shock environments MAY result in insulation damage to wiring. The result of that damage is of obvious concern.

Once upon a time I had a power distribution module fabricated. During fabrication, the technician tucked a bundle of wires up and behind a threaded insert used for attaching the module lid, presumably in liue of using a sticky-pad hold-down or similar to fasten the wire-bundle. About six months later, the power-distribution module unexpectedly failed (technically, a DC/DC converter onboard went into over-current protection mode and ceased to put out voltage, causing the attached computer system to experience momentary power-loss and resultant reset). When found, three of the aforementioned wires had frayed through, due to repeated rubbing against the threaded-insert, and the wires had proximity and orientation which led me to a conclusion of intermittent chassis contact.

aj