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Dc Motor Calculations Pdf Download
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Click,,,on,,,any,,,of,,,the,,,subheadings,,,to,,,jump,,,to,,,that,,,particular,,,subsection.,,,Draw,,a,,straight,,line,,from,,the,,left,,origin,,of,,the,,graph,,(zero,,torque,,and,,zero,,current),,to,,the,,stall,,current,,on,,the,,right,,vertical,,axis,,(stall,,torque,,and,,stall,,current).,,Motor,,thermal,,resistances,,for,,small,,DC,,motors,,are,,usually,,specified,,with,,the,,motor,,suspended,,in,,free,,air.,,Torque,,,And,,,Efficiency,,,Vs.,,,The,,,,motor,,,,constant,,,,is,,,,a,,,,function,,,,of,,,,the,,,,coil,,,,design,,,,and,,,,the,,,,strength,,,,and,,,,direction,,,,of,,,,the,,,,flux,,,,lines,,,,in,,,,the,,,,air,,,,gap.,,,,In,,,,this,,,,application:,,,,input,,,,power,,,,=,,,,9,,,,volts,,,,x,,,,0.203,,,,A,,,,=,,,,1.82Watts,,,,Since,,,,efficiency,,,,is,,,,simply,,,,power,,,,out,,,,divided,,,,by,,,,power,,,,in,,,,,the,,,,efficiency,,,,in,,,,this,,,,application,,,,is:,,,,efficiency,,,,=,,,,1.18,,,,Watts,,,,/,,,,1.82,,,,Watts,,,,=,,,,0.65,,,,=,,,,65%,,,,Thermal,,,,Calculations,,,,A,,,,current,,,,I,,,,flowing,,,,through,,,,a,,,,resistance,,,,R,,,,results,,,,in,,,,a,,,,power,,,,loss,,,,as,,,,heat,,,,of,,,,I2R.,,,,
Below,,,we,,,have,,,provided,,,some,,,important,,,formulas,,,and,,,calculation,,,details,,,to,,,determine,,,mechanical,,,power,,,requirements,,,of,,,a,,,DC,,,motor,,,,to,,,calculate,,,torque,,,,and,,,for,,,determining,,,the,,,steady,,,state,,,temperature,,,increase,,,of,,,a,,,motor.,,,The,,case-to-ambient,,thermal,,resistance,,can,,be,,decreased,,significantly,,by,,the,,addition,,of,,heat,,sinks.,,Scale,,the,,axes,,based,,on,,the,,measurements,,in,,step,,1.,,Turning,,our,,attention,,to,,torque,,T,,,we,,know,,that,,the,,mechanical,,power,,P,,is,,given,,by,,the,,expression,,P,,=,,nT/9.55,,(3.5),,where,,n,,is,,the,,speed,,of,,rotation.,,The,,mechanical,,power,,of,,the,,motor,,is,,therefore,,exactly,,equal,,to,,the,,product,,of,,the,,cemf,,multiplied,,by,,the,,armature,,current,,P,,=,,EoI,,(5.5),,where,,P,,=,,mechanical,,power,,developed,,by,,the,,motor,,[W],,Eo,,=,,induced,,voltage,,in,,the,,armature,,(cemf),,[V],,/,,=,,total,,current,,supplied,,to,,the,,armature,,[A],,2.,,In,,,,practice,,,,,this,,,,would,,,,cause,,,,the,,,,fuses,,,,to,,,,blow,,,,or,,,,the,,,,circuit-breakers,,,,to,,,,trip.,,,,A,,,sample,,,table,,,of,,,calculations,,,for,,,motor,,,M2232U12G,,,is,,,shown,,,in,,,Table,,,1.,,,However,,,,,for,,,,special,,,,applications,,,,such,,,,as,,,,in,,,,steel,,,,mills,,,,,mines,,,,,and,,,,electric,,,,trains,,,,,it,,,,is,,,,sometimes,,,,advantageous,,,,to,,,,transform,,,,the,,,,alternating,,,,current,,,,into,,,,direct,,,,current,,,,in,,,,order,,,,to,,,,use,,,,dc,,,,motors.,,,,
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by Randmakal on 2016-09-01 05:47:00
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