Table of Contents - sitrain.us

1 Table of ,. ,. ,. of AC of AC : . ,.inertia,.speed,.. ,.slip,.. ,. ,. ,.. ,.torque,.. ,.IEC,. ,. of Electricity of AC of ,. ,. ,.. ,.Rosslyn,.. ,.Northbrook,. MotorsAC ,. AC induction motors,. ,.conveyor,. ,. ,. Electrical Manufacturers Association (NEMA).. ,. ,.. ,. NEMA ,. above NEMA Electrotechnical Commission (IEC). ,. ,. ,. ,. ,.however,. and ,. ,.gravity,. ,. ,. ,. LB20 LB10 LBIf. ,. LB10 LB5 LB7If. ,. LB10 ,. ( ). ( )..=. ,. (lb-ft). (lb-in).. ,.if.. ,. footTorque (t) = 10 lb-ftForce = 10 ,. ,. feetTorque (t) = 20 lb-ftForce = 10 pounds ,. ,. (m/s)..Therefore,. ,. MotionAngular (Rotational) (RPM).

2 ,. ,. of RotationDirection ofRotationRotional ( ).. ,. ,. ,. RPM20 RPMA cceleration20 RPM10 of (lb-ft2). ,. ,. ,. ,.however,. ,. ,. ,. ,. ,. ,..newton-meter,.. ,. (ft-lb),.where..pound. ,. ,. , ,. ,. (HP).. ,.speed,. in HP =Torque in lb-ft x Speed in RPM5252 Horsepower and ,. (kW).. ,.. 1 .. ,. ,.. 2AC motor ConstructionThree-phase AC induction ,.rotor,.stator,. ,. Core ,. Lamination 3 Stator Windings Partially ,. ,. ,. Windings Completed 4 Rotor cage ,.conductor cast copper rotor Premium efficiency ,. View of RotorConductor BarEnd RingShaftSteel Laminations ( ). ( ).. GapPartially Assembled.

3 ,. ,. Bracket(Bearing Housing)RotorStatorCooling FanFrame (Yoke)BearingEnd Bracket(Bearing Housing)Cutaway View of motor 6 Review 2 .. :.. ,. ,. ,. ,. Lines of ,. of flux,. ,. ,. ,. ,. ,. Filings on PaperMagnetic Lines of Flux Unlike Poles ,. ,. Poles ,. ,. ,.unlike poles poles ,. ,. produces a magnetic fieldAn increased current produces a stronger magnetic fieldLeft-Hand Rule for rule for ,. ,. ( ),. ( ),. Flow Away From YouCauses Counterclockwise Magnetic FluxElectron Flow Towards YouCauses Clockwise Magnetic ,. ,. VoltageAir CoreAdding an Iron core,. CoreDC VoltageNumber of DC Voltage5 TurnsDC Voltage10 TurnsChanging.

4 ,. ,. ,. ,. ,. ,. ,. ,. ,. ,. ,. ,. ,. ,. ,. ,. ,. ,. 1 Time 2 Time ,. ,. ,. ,. ,. ,. ,.however,. ,. ,. ,. PositionNew PositionReview 3 .. ,.. a Rotating Magnetic Coil ,. ,. ,. ,. ,. ,. ,. ,.. ,. ,. ,. CoreMotor Windings25 Stator Power . ,.B . ,.. Phase ATo Phase APhase APhase CPhase B0+ ,. ,.B ,..are. 20 . ,.B2,. 20 . 20 . ,. Stator ,. ,.B .. ,. ,.B .. ,.. ,.B .. Magnetic FieldMagnetic Lines of FluxCurrent Flow in the Positive DirectionCurrent Flow at ZeroCurrent Flow in the Negative DirectionStartCABA1B2C1A2B1C2 NSNSTime .. ,.. Flow in the Positive DirectionCurrent Flow at ZeroCurrent Flow in the Negative DirectionStartCABA1B2C1A2B1C2 NSNS60o60o1A1B2C1A2B1C2 NSNSTime.

5 ,..Current Flow in the Positive DirectionCurrent Flow at ZeroCurrent Flow in the Negative DirectionStartCABA1B2A2B1C2 NSNS60o1A1B2C1A2B1C2 SNS120o260oC1A1B2C1A2B1C2 NNSS2 360 ,.. speed (NS). (F),. of motor poles (P).. ,. ,. RotationPermanent ,. ,. ,. ,. ,. ,. ,. ,. ,. Conductor BarStatorRotorMagnetic Field of Coil ,. ,. ,. (emf). ,. ,.. ,.. ,. ,. ,. ,. ,. ,. ,. Slip =x 100NS - ,. speed (NS).of. speed (NR). ,..4%.% Slip = % Slip = 1800 - 17751800x 100 Wound Rotor rotor ,. ,. RingBrushWound RotorExternal Variable ResistorsSynchronous ,. ,. ,. ,. DCPower SupplySlip RingBrushRotor ,. 4 .. ,. ,. ,. ( ).three-phase.

6 ( ). in Mexico by SIEMENS USRNEMA PREMIUM Source (VOLTS) and Current (AMPS).. Speed ( ) ,. ,. (HERTZ). ,..4%.. ,. Slip = % Slip = 1800 - 17751800x 10035 Service ,..0,. ,. ,. ,.. 5%. insulation ,.B,.F, ..C.( 04 .F).. ,. ,. 0 . temperature . ,.. 5,.add. 0 .. 55 . 0 . motor (A,.B,.C,. ). ,. ,. ,. ,. nominal Policy Act of 1992 (EPAct). ,. ,. Independence and Security Act of 2007 (EISA). 9,.20 NEMA Premium Efficient Ultra Efficient cast copper rotor motor CharacteristicsStandard motor ,.A,.B,.C,. ,. ,. Curve ,. B ,. ,. ,. ,. B ,. ,. ,.pumps,. ,. ,. ,. =Torque (in lb-ft) x Speed (in RPM)5252 Torque (in lb-ft) =HP x 5252 Speed (in RPM)=30 x 52521765= lb-ft3 Starting torque, rotor torque.

7 ,. ,. 50%. ,. ,.that lb-ftPull-up ,. ,. ,. ,. 7 . lb-ftPull-up TorqueBreakdown TorqueStarting TorqueFull-load Torque39 Full-Load 00%. ,.frequency,. ,..9%. lb-ftPull-up TorqueBreakdown TorqueFull-load TorqueSlip .. ,. ,. ,. ,. Torque Load 1 Variable Torque Load 2 Constant Torque Load 1 Constant Torque Load 240 Starting Current current,. rotor current,.isFull-Load ,.frequency,. ,. A motor NEMA A ,. ,. C C ,. ,. ,. ,. ,.240%. lb-ft174 lb-ftBreakdown TorqueNEMA D motor design D 0%. ,. 3%.. lb-ftSlip 8%42 Review 5.. ,. ,. ,. 0%. ,. 0%. ,. ,. ,. ,. ,. ,. 0%.

8 ,. ,. ,. ,. ,. ,. Motors and AC per Hertz (V/Hz). per hertz (V/Hz) ,. ,. ,.. V/HZ= V/Hz230 V60 Hz460 V60 HzConstant Torque ,.however,. ( ).. torque ,. ,. ,. ,. ,. ,.flux,. ,. horsepower in HP =Torque in lb-ft x Speed in ,. ,. ,. Voltage ,.itFrequency 50%. ,. ,. 50%.torque,. 50%. ,. ,. 50%. ,. ,. a addition,. ,. ,. Distance Between and the ,. ,. ,. ( ). ( ). Factor on AC . ,.the.. Motors to the Characteristics ,. ,.. Load ,. ,. = Force x ,.. ,. ,. ,. ,.stall,. ,. torque lb-ft120 lb-ftMotorCentrifugal Pump5 ,. Down ,. 6 .. ,. ,. ,. ,..B.. 1 Load 2 Load 4 Load 3 Motor53 motor .

9 ,. :. Drip Proof (ODP). drip proof (ODP) 5 . ,. ,. Enclosed . ,. (TENV). enclosed non-ventilated (TENV). ,. ,. ,.dust,. ,. Enclosed Fan Cooled. enclosed fan-cooled (TEFC) (TEFC) ,. ,.moist,. Fan55 Explosion Proof (XP) ,.mining,.foundry,. ,. ,. ,. ,. proof (XP) ,.however,. ,. Electrical Code . !!ATTENTIONWARNING!WarningHazardous (Classified). specify or suggest the type of classification,. user s Electrical Code I and II I II and ,. ,.Class I, Groups A through II, Groups E, F, and ,. IClass IIClass IIIG roups A-DGroups E-GFlammable LintGas or Vapor Flammable Dust or FibersExamples:Examples:Examples:Gasolin eCoke DustTextilesAcetoneGrain DustSaw DustHydrogen56 MountingNEMA motor .

10 ,. ,. ,. ,. ,. ,. horsepower ,.4 ,. horsepower ,. ,. ,.a..inches.( 4..4).. ,. IEC ,. Positions floor mounting ,.. Position(Standard)F-2 PositionConduit ,. W-1 Assembly C-1 Assembly C-2 Assembly W-2 Assembly W-3 Assembly W-4 Assembly W-5 Assembly W-6 Assembly W-7 Assembly W-8 Mounting ,. ,. Bolt 7 .. 5 . Siemens AC Induction ,. ,. Purpose NEMA Purpose NEMA ,. ,. ,.pump,.fan,.compressor,. (TEFC). ,.NEMA Premium ,. Savings with NEMA Efficiency Motors ,. ,. ,. ( motor . ). %. $ $ = P + x HP x T x R EC = motor lifecycle costP = initial purchase = HP to kilowatt conversion factorHP = motor full-load horsepowerT = estimated motor lifetime in hoursR = utility kilowatt-hour rateE = efficiency expressed as a decimal valueC = $675 + x 20 HP x 60,000 Hrs.