Rotary device with matched expansion ceramic bearings

Details Rotary device with matched expansion ceramic bearings Rotary device with matched expansion ceramic bearings

H - Electricity

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H01F 7/08 (2006.01) G01R 1/00 (2006.01) H01F 7/14 (2006.01) H02K 5/16 (2006.01) H02K 7/08 (2006.01) H02K 33/00 (2006.01) H02K 35/00 (2006.01) H02K 26/00 (2006.01)

Patent

CA 2397062

A high precision torque motor, including a partial rotation drive suitable for use in a galvanometer scanner, where the rotor (2) is supported within the stator (1) and housing assembly on all ceramic ball bearings (5, 6), including inner and outer races and bearing balls. The ceramic ball bearing assemblies and all structural support elements have substantially equal coefficients of expansion through the use of matched expansion, nickel-iron alloy for the rotor shaft, stator, housing and other structural components which contact, locate, and support the inner and outer bearing races. The non-conductive bearings permit exclusion of any grounding conductor strap as between the rotor shaft and the housing.

Ce moteur à couple haute précision comporte une commande rotation partielle se prêtant à une utilisation dans un scanneur à galvanomètre, le rotor (2) étant monté dans le stator (1) et dans un ensemble carter et étant soutenu par tous les roulements à billes (5, 6) céramique comportant des bagues intérieures et extérieures ainsi que des billes. Ces ensembles roulement à billes céramique ainsi que tous les éléments structuraux de support ont des coefficients d'expansion sensiblement égaux dans la mesure où cette expansion est adaptée. L'arbre rotor, le stator, le carter et d'autres composants structuraux qui entrent en contact avec les bagues de roulement intérieures et extérieures, les positionnement et les soutiennent sont faits d'un alliage fer au nickel. Ces roulements non conducteurs évitent d'avoir recours à une bande de conducteur de terre entre l'arbre rotor et le carter.

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