Sen­sors not needed for DC mo­tor con­troller

DEMM Engineering & Manufacturing - - MOTORS, DRIVES AND TRANSMISSIONS -

Maxon Mo­tor’s new brush­less DC mo­tor con­troller packs a punch de­spite its tiny di­men­sions of only 43mm x 11mm.

The firm’s servo con­troller range just re­ceived a new model that fea­tures an OEM plug-in style form fac­tor for easy in­te­gra­tion into new equip­ment.

Sup­port­ing the ex­ist­ing con­trollers, that re­quire the mo­tor to have a min­i­mum of three hall sen­sors to op­er­ate, this new mo­tor con­troller can be used with brush­less mo­tors that are not fit­ted with ei­ther hall sen­sors or an en­coder.

De­spite this lack of ‘feed­back’ from the mo­tor, the smart con­troller is still able to pro­vide a closed loop speed con­trol be­tween the mo­tor and con­trol unit.

12 Amp of peak cur­rent is avail­able for up to 30 sec­onds on top of a con­tin­u­ous cur­rent rat­ing of 4 Amp. The volt­age level ex­cepted is any­thing be­tween 10 and 50 VDC, which is par­tic­u­larly help­ful in mo­tor con­trol ap­pli­ca­tions with rapid de­cel­er­a­tion rates, and high lev­els of back fed en­ergy.

The mo­tor con­troller is pro­tected against wind­ing short cir­cuits, volt­age spikes, and over tem­per­a­ture con­di­tions.

It is also able to self-limit the amount of cur­rent the mo­tor is al­lowed to draw from the mo­tor con­trol unit, which al­lows a mo­tor to be driven to stall with­out burn­ing out.

There is a large amount of I/O that can be set up with the free soft­ware pack­age.

demm.co.nz/reader-en­quiry #D140221

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