[{"data":1,"prerenderedAt":183},["ShallowReactive",2],{"\u002Fen\u002Fglossary\u002Fcoreless-motor":3},{"id":4,"title":5,"alternateName":6,"body":7,"description":173,"extension":174,"keywords":175,"meta":176,"navigation":177,"path":178,"seo":179,"stem":180,"updated":181,"__hash__":182},"glossary\u002Fglossary\u002Fen\u002Fcoreless-motor.md","Coreless Motor","空心杯电机",{"type":8,"value":9,"toc":167},"minimark",[10,15,32,37,45,73,76,80,150],[11,12,14],"h1",{"id":13},"what-is-a-coreless-motor","What Is a Coreless Motor?",[16,17,18,19,23,24,27,28,31],"p",{},"A ",[20,21,22],"strong",{},"coreless motor"," (ironless motor) uses a ",[20,25,26],{},"self-supporting cup-shaped winding without an iron core"," as its rotor — the copper cylinder itself spins in the magnetic field. Removing the iron eliminates iron losses and cogging torque, cuts rotor inertia by roughly an order of magnitude versus an iron-core motor of the same size, and pushes the electrical time constant ",[20,29,30],{},"below 1 ms"," for very fast start-stop response.",[33,34,36],"h2",{"id":35},"why-dexterous-hands-use-coreless-motors","Why Dexterous Hands Use Coreless Motors",[16,38,18,39,44],{},[40,41,43],"a",{"href":42},"\u002Fen\u002Fglossary\u002Fdexterous-hand","dexterous hand"," finger has only 10–20 mm of diameter to work with, yet must grasp at high frequency:",[46,47,48,55,61,67],"ul",{},[49,50,51,54],"li",{},[20,52,53],{},"Compact",": a 4–16 mm coreless motor plus a micro planetary gearbox or leadscrew drives one finger;",[49,56,57,60],{},[20,58,59],{},"Low inertia, fast response",": finger open\u002Fclose cycles of several Hz are achievable;",[49,62,63,66],{},[20,64,65],{},"No cogging",": smooth grasp force, better fingertip force control;",[49,68,69,72],{},[20,70,71],{},"Efficient",": typically 70%–90%, important with the limited heat dissipation inside a palm.",[16,74,75],{},"The trade-off: the cup winding dissipates heat poorly and tolerates little overload — continuous torque sits in the mN·m range, so a high gear ratio is mandatory for usable grip force.",[33,77,79],{"id":78},"coreless-vs-frameless-torque-motor-division-of-labor","Coreless vs. Frameless Torque Motor: Division of Labor",[81,82,83,102],"table",{},[84,85,86],"thead",{},[87,88,89,93,96],"tr",{},[90,91,92],"th",{},"Dimension",[90,94,95],{},"Coreless motor",[90,97,98],{},[40,99,101],{"href":100},"\u002Fen\u002Fglossary\u002Fframeless-torque-motor","Frameless torque motor",[103,104,105,117,128,139],"tbody",{},[87,106,107,111,114],{},[108,109,110],"td",{},"Rotor",[108,112,113],{},"Ironless cup winding",[108,115,116],{},"Iron-core stator\u002Frotor kit",[87,118,119,122,125],{},[108,120,121],{},"Typical diameter",[108,123,124],{},"4–40 mm",[108,126,127],{},"40–120 mm",[87,129,130,133,136],{},[108,131,132],{},"Torque scale",[108,134,135],{},"mN·m (needs high ratio)",[108,137,138],{},"N·m (low ratio suffices)",[87,140,141,144,147],{},[108,142,143],{},"Typical location",[108,145,146],{},"Fingers, micro actuators",[108,148,149],{},"Arm\u002Fleg joint actuators",[16,151,152,153,156,157,161,162,166],{},"One-line split: ",[20,154,155],{},"coreless for fingers, frameless torque motors for arm and leg joints",". BXI's ",[40,158,160],{"href":159},"\u002Fen\u002Fmotors\u002Fadvanced-motors","85\u002F70\u002F50-series joint actuators"," take the frameless-motor-plus-planetary ",[40,163,165],{"href":164},"\u002Fen\u002Fglossary\u002Fquasi-direct-drive","quasi-direct-drive"," route for high-torque limbs, complementing coreless-driven hands at the end effector.",{"title":168,"searchDepth":169,"depth":169,"links":170},"",2,[171,172],{"id":35,"depth":169,"text":36},{"id":78,"depth":169,"text":79},"A coreless motor uses an ironless cup winding for low inertia, low cogging, and fast response in dexterous hands and other compact precision drives.","md","coreless motor, ironless motor, coreless motor dexterous hand, coreless vs frameless motor, low inertia motor",{},true,"\u002Fglossary\u002Fen\u002Fcoreless-motor",{"title":5,"description":173},"glossary\u002Fen\u002Fcoreless-motor",null,"e0EHSclkEwdKjY17rtR8FkYZzFMBRsPJGnY5r-DSWqw",1785156467100]