Mo­tors & drives

DEMM Engineering & Manufacturing - - CONTENTS -

Core­less DC mo­tors (iron­less mo­tors) and brush­less DC mo­tors (BLDC mo­tors) have many fea­tures over tra­di­tional mo­tor de­signs that make them more suit­able for ap­pli­ca­tions re­quir­ing highly dy­namic mo­tion con­trol.

They typ­i­cally have lower in­er­tia, higher ef­fi­cien­cies and ex­tremely long life spans. Ap­pli­ca­tions in­clude ro­bot­ics and life crit­i­cal med­i­cal de­vices. Pre­vi­ously, ap­pli­ca­tions that needed to use the peak per­for­mance ca­pa­bil­i­ties of mo­tors and in par­tic­u­lar for multi-axis con­trol, the sys­tem bot­tle­neck was of­ten the speed ca­pa­bil­i­ties of the mo­tion con­troller.

The new DC mo­tor po­si­tion con­troller from Maxon Mo­tor in­cor­po­rates the lat­est FPGA com­po­nen­try al­low­ing full use of the most dy­namic DC mo­tors avail­able.

The con­troller fea­tures the fastest con­trol cy­cles for path cal­cu­la­tions in so­phis­ti­cated multi axis co­or­di­nated move­ment ap­pli­ca­tions. It has an in­ter­nal cur­rent con­troller clock oper­a­tion of 100kHz and a com­mu­ni­ca­tion ro­ta­tion of 100μs with the EtherCAT mas­ter.

High res­o­lu­tion dis­trib­uted clocks can be sup­ported for a pow­er­ful so­lu­tion whereby co­or­di­nated servo axes can carry out mo­tion with ab­so­lute syn­chronic­ity. CAN over EtherCAT is sup­ported as well as cyclic syn­chro­nous path plan­ning with a closed loop PID over the net­work. The con­trollers pro­cess­ing ca­pa­bil­ity even al­lows si­nu­soidal com­mu­ta­tion of brush­less DC mo­tors up to speeds of 200,000rpm.

Al­most any cus­tomer pre­ferred feed­back to­pog­ra­phy is ac­cepted. This fur­ther opens the range of DC mo­tors that can be con­trolled, whether brushed or brush­less, in­clud­ing ab­so­lute, in­cre­men­tal, si­nu­soidal (sinecos) ana­logue in­cre­men­tal en­coders.

Even mul­ti­ple en­coders for dual loop mo­tor con­trol can be used, al­low­ing for ex­am­ple, a dig­i­tal in­cre­men­tal en­coder to be mounted to the DC mo­tor for ac­cu­rate ve­loc­ity con­trol and an ab­so­lute SSI en­coder mounted to the load for po­si­tion con­trol. Clos­ing dual loops in this fash­ion al­lows for ex­tremely ac­cu­rate con­trol of the po­si­tion around gear head back­lash or load and cou­pling elas­tic­ity.

With more than 20 years' ex­pe­ri­ence of mo­tion con­trol Maxon Mo­tor con­trollers have be­come syn­ony­mous with rep­u­ta­tion of safety by in­cor­po­rat­ing al­most ev­ery pro­tec­tion pos­si­ble.

An­other key fea­ture of high-end mo­tor con­trollers that is of­ten over­looked is the abil­ity to pro­tect users, loads, sen­si­tive equip­ment and the drive sys­tem it­self with ac­cu­rate cur­rent lim­it­ing cir­cuitry. A new graph­i­cal user in­ter­face has made in­stal­la­tion eas­ier than ever.

demm.co.nz/read­eren­quiry #M140526

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