Brush­less DC mo­tors for use in vac­uum

DEMM Engineering & Manufacturing - - PRODUCT WATCH - reader-en­quiry #151003.

Maxon mo­tor have re­leased a Brush­less DC mo­tor suit­able for use in ul­tra-high vac­uum. The 22mm 24V brush­less DC mo­tor is unique in that it is an off-the-shelf so­lu­tion for an ap­pli­ca­tion that tra­di­tion­ally re-quires high lev­els of cus­tomi­sa­tion. The all stain­less steel con­struc­tion, SmCo mag­net based brush­less mo­tor fea­tures very low out­gassing and can be baked out at 240˚C. It is also vi­bra­tion tested to MIL-STD810F. Sci­en­tific and vac­uum ap­pli­ca­tions for DC mo­tors are ex­tremely var­ied. An ex­am­ple be­ing the Watt bal­ance, a ma­chine de­vel­oped to com­pare masses with elec­tri­cal val­ues in a vac­uum. Its pur­pose is to re­de­fine the mea­sure of a kilo­gram. In the past we have re­lied sim­ply on a known set of plat­inum-irid­ium weights that have var­ied with one another over time. The Watt bal­ance seeks to over­come this prob­lem us­ing Planck’s Con­stant to de­fine the kilo­gram in terms of volt­age and cur­rent. The vac­uum ca­pa­ble mo­tor has al­lowed sci­en­tists to build a three­axis ro­bot pro­vid­ing the nec­es­sary mass move­ments for the experiment.

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