磁悬浮列车牵引系统课件.ppt

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1、磁悬浮列车牵引系统磁悬浮列车牵引系统Maglev Traction System2Content1.Overview of Maglev2.Fundamentals3.Traction system and subsystems4.Shanghai Maglev3BackgroundlChangesIncrease of populationUrbanizationQuality of lifelProblems ofAir servicesAutomobilesConventional trains4MaglevlMagnetic levitation trainlLevitated and

2、 propelled using electromagnetismGuidewayArmElevated track5HistorylFirst patent by Hermann Kemper of Germany in 1934lQuickening period of the 1960slMaturity of the 1970s 1980slTest period of the 1990slPractical public service in 2003lMain research done by Germany and Japan6ComparisonMaglevWheel-on-R

3、ailNoise60 65 dB75 80 dBSafetyNo derailment and slippingDerails from a minor defectMaintenance Very littlePeriodicGrade80100/10003050/1000Curve30 m in radius150 m in radiusOperating speedUp to 500 km/hBelow 300 km/h7CharacteristicslNot suitable for freightlLess susceptible for icy conditionslEnviron

4、ment friendlylGood acceleration and decelerationlDifficult for switching or branching offlExpensive for constructionlDangerous when electricity supply is interrupted8Content1.Overview of Maglev2.Fundamentals3.Traction system and subsystems4.Shanghai Maglev9MagnetismlMagnetism arises from moving char

5、geslMeasurementMagnetic induction IineMagnetic flux densityMagnetic flux10Electromagnetism(I)lRight-hand screw rule(Amperes rule)11Electromagnetism(II)lFaradays law of inductionlLenzs lawAn induced electromotive force(EMF)always gives rise to a current whose magnetic field opposes the original chang

6、e in magnetic flux12Electromagnetism(III)lRight-hand rulelLeft-hand rule13Electrical engineeringFunctionTypical CircuitRectifierAC-DCBridge rectifierInverterDC-ACPWM inverterChopperDC-DCBuck/boost circuitTransformerAC-AC -VFDAC-ACRectifier+Filter+Inverter14Content1.Overview of Maglev2.Fundamentals3.

7、Traction system and subsystems4.Shanghai Maglev15SubsystemslLevitationlGuidancelPropulsionlBrakinglEnergy supply16EDSlElectrodynamic suspensionlCharacteristicsMagnetic repulsive forceAir gap about 100 mmSuitable for high-speed operationCannot levitate below 100 km/hNeed rubber tires17One typelClassi

8、ficationPermanent Magnet(PM)Superconducting Magnet(SCM)18Another type19EMSlElectromagnetic suspensionlCharacteristicsMagnetic attraction forceAir gap about 10 mmNeed precise controlEasier than EDS technicallyCan levitate in zero or low speeds(backup battery)Coils on the guideway20ClassificationlInte

9、grated typelSeparated type21DevelopmentlUse superconducting magnet instead of conventional electromagnetlPermanent magnets are partly used with electromagnets22GuidancelMechanical guide wheellZero magnetic flux guidancelMagnetic forceRepulsive forceAttraction force23Magnetic forcelAttraction forcelR

10、epulsive force24PropulsionlMagnetic forcelLinear motor25AC asynchronous motor26AC synchronous motor27Linear motor28LIMlLinear induction motor29LP/SPlLong Primary/Short Primary30LSMlLinear synchronous motor31ClassificationlField locationLong PrimaryShort PrimarylMagnetic fieldPermanent MagnetElectrom

11、agnet with iron-coreSuperconducting magnet with air-core32BrakinglMethodSwap the poles of electromagnetSwap the phase sequence of primary wire loopslStrategyDecrease the number of railway stationsRegenerative braking and eddy current braking as primary brakingOil braking as secondary braking33Hybrid

12、 brakinglAbove a certain speed(usually 520 km/h)Regenerative brakingEddy current brakinglBelow a certain speedOil brakingHigh-friction skids(backup)34Energy Collection lOn-board batteries:insufficientlElectric power supply from ground side to supportLevitationPropulsionOn-board electrical equipmentB

13、attery recharging35ClassificationlLow-medium speed operationMechanical contact such as a pantographSP type maglev used in this situationlHigh speed operationLinear generator36Linear generator37Energy infrastructureTransformerRectifierFilterInverterLoadTransformer38Content1.Overview of Maglev2.Fundam

14、entals3.Traction system and subsystems4.Shanghai MaglevOverviewShanghai maglevTransit typeMagnetic levitationBegan operationJanuary 1,2004Number of lines1Number of stations 2Length30.5 kmMax operational speed431 km/h TechnologyShanghai maglevLevitationEMSPropulsionLP-LSMGuidanceMagnetic repulsive fo

15、rceAir gapAbout 10 mmPrimary brakingTrack eddy current brake(5 km/h)Secondary braking Regenerating brake(5 km/h)Oil brake(5 km/h)High-friction skids Electric power supplyComparisonHSST(Japan)MLU(Japan)LevitationEMSEDSPropulsionSP-LIMLP-LSMAir gap812 mm80 150 mmMax speed100 km/h581 km/hGuidanceIntegratedIntegratedServiceLow-medium speed,short distanceHigh speed,long distanceEnd