Treść książki
Przejdź do opcji czytnikaPrzejdź do nawigacjiPrzejdź do informacjiPrzejdź do stopki
3.ACinductionmachine-transformer...........................................127
3.1.Idlestateoftransformer..................................................129
3.2.Theloadconditionoftransformer..........................................130
3.3.Thesimplifiedequivalentschemeandvectordiagramfortransformer’sshortcircuit..133
3.4.Powerandefficiencyoftransformer........................................134
3.5.Thethree-phasetransformer..............................................135
RotatingElectricMachines......................................................136
1.ACInductionMotor........................................................136
1.1.Constructionof3-phaseACinductionmotor.................................136
1.2.Principlesofoperation...................................................139
1.3.ThetransformationratioofACinductionmotor...............................141
1.4.Rotorandstatorcurrents.................................................142
1.5.TherotatingtorqueofACinductionmotor-electromagnetictorque..............143
1.5.1.Electromagnetictorque.............................................143
1.5.2.Rotatingtorque...................................................144
1.6.Dependenceofelectromagnetictorqueonstatorsupplyingvoltage................146
1.7.Maximumvalueofelectromagnetictorque...................................147
1.8.Electromagnetictorqueanditsmaximalvaluequotient.........................148
1.9.Standardtorque-speed-slipcurves..........................................148
1.10.Single-phaseACinductionmotor..........................................150
1.11.Slipringmotor........................................................151
1.12.BasicsofACinductionmotor’storque-speedcontrol..........................151
1.13.Discussionoftorque-slipandtorque-speedcurvesfor2-quarterACinductionmotor
operation.............................................................154
2.DirectCurrent(DC)Motor...................................................157
2.1.DCmotorbasics.......................................................157
2.2.DCmotorbasicvoltage/torqueequations....................................161
2.3.ThegeneratingmodeofDCmotor.........................................165
2.4.MainmechanicalcharacteristicsofDCmotors................................167
2.4.1.Self-excitedDCmotor..............................................167
2.4.2.SeriesDCmotor..................................................169
2.5.Torque/speedcontrolofDCmotor.........................................171
2.6.SeparatelyexcitedDCmotordynamicanalysis...............................175
3.ConventionalSynchronousMachine............................................178
3.1.Synchronousmotor.....................................................179
3.2.Startingsynchronousmotorpoweredbyagrid-machinesynchronization..........181
3.3.Thepowerfactor.......................................................182
3.4.PMsynchronousMotor..................................................183
3.4.1.OperatingPrinciplesandConstructionEvolution.........................183
3.4.2.Convertercircuits..................................................186
3.5.PMbrushlessDCmotor(BLDC)..........................................190
3.6.Automotivealternators..................................................192
References...................................................................195
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