New en­coder de­sign for brush­less flat mo­tor fur­ther re­duces length

DEMM Engineering & Manufacturing - - PRODUCT WATCH - www.demm.co.nz/reader-en­quiry #160206a

Flat brush­less DC mo­tors use maxon’s new mile en­coder tech­nol­ogy to even fur­ther re­duce mo­tor length. The first pic­ture shows what used to be a very el­e­gant so­lu­tion us­ing an alu­minium cover to con­tain the mo­tor’s ex­ter­nal ro­tor, also act­ing as a mount­ing. The dis­ad­van­tage is the mo­tor needs to be man­u­fac­tured with a cus­tom rear shaft, adding to cost and the en­coder (al­though low pro­file) adds to the length.

The new en­coder over­comes th­ese prob­lems as well as of in­creas­ing res­o­lu­tion. The se­cond pic­ture is the MILE en­coder, in­duc­tive based us­ing a high fre­quency al­ter­nat­ing field and a struc­tured cop­per disc to de­rive an­gle de­pen­dent in­for­ma­tion. This tech­nol­ogy is very ro­bust against magnetic and elec­tri­cal fields and con­tam­i­na­tion from harsh op­er­at­ing en­vi­ron­ments. The elec­tron­ics are all in­side the mo­tor be­tween the ro­tor and the sta­tor of the out­run­ner style brush­less f lat mo­tors, en­hanc­ing form fac­tor and mak­ing it suit­able for space-crit­i­cal mo­tor ap­pli­ca­tions in man­u­fac­tur­ing fields. Res­o­lu­tions avail­able up to 25,600qc.

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