Importance

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Abstract

A brushless DC motor-driven spindle assembly for a textile ring spinning frame wherein a shaft for rotatably supporting a bobbin for yarn collection is mounted for rotation about a central axis of rotation in a bolster section and, under certain conditions of operation, for rotation about axes which are incrementally angularly displaced from the central axis of rotation, and including rotor/stator position detecting elements comprising sensed elements mounted on the motor rotor for rotation therewith and sensing elements mounted in fixed position relative to the rotor and adjacent the path of movement of the sensed elements so as to maintain the same radial distance between the sensing elements and the sensed elements during incremental angular displacement of the axis of rotation of the shaft and motor rotor. In a preferred embodiment, the sensed elements may be a magnetic ring mounted on the rotor and having alternating North and South pole sections, and the sensing elements may be Hall effect sensors mounted in fixed position on a portion of the bolster section to correspondingly move with the incremental angular displacement of the rotational axis of the bobbin support shaft of the spindle assembly.

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First Claim