Yarn feeding device
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United States of America Patent
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Aug 1, 2006
Grant Date -
Mar 24, 2005
app pub date -
Sep 24, 2002
filing date -
Sep 24, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a yarn feeding device (F) for weaving or knitting machines whose winding element (W) is driven by an electric motor (M) controlled by an electronic speed control device (CU). According to the invention, the electric motor (M) is a synchronous motor, in particular, a permanent magnet (PM) motor with the speed control device (CU) provided for effecting a permanent vector control with the stator being sinusoidally acted upon. Continuously determined information pertaining to the relevant rotational position of the rotor (R) of the motor (M) is used in the speed control device (CU), which serves to perform permanent vector control, in order to adjust at least one predetermined rotational position (X1, X2) of the winding element (W).
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