Numerically controlled drive device with device for detecting operating anomalies intended for detecting accidental collisions and method of detecting operating anomalies for this device
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United States of America Patent
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Dec 18, 2007
Grant Date -
Oct 27, 2005
app pub date -
Apr 25, 2005
filing date -
Apr 27, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A drive device for a load (18a) comprises a device for detecting accidental collisions with a motor (14a), a first, respectively a second position sensor (15a, 16a) disposed upstream, respectively downstream of a transmission assembly (12a) providing first and second values of position. A calculation unit (20) makes it possible to calculate an error signal (d) corresponding to the difference of these position values. Ways to discriminate are devised so as to analyze the successive error signals as a function of the path (x.sub.R) traversed by the load in a spatial reference frame (x.sub.R, d). Filters with rectangular spatial window or with exponential spatial window are particularly adapted for discriminating between errors due to an accidental collision and those due to other causes attributable to normal operation. One thus obtains particularly reliable and sensitive collision detection with a very low detection threshold.
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