电机学电机学电机学 (20).ppt

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1、Electrical MachineryComposition of three-phase single-layer windings For single-layer winding,one coil side in each slot,and the number of coils is equal to half number of slots.III.Three-phase single-layer windings1.Structural diagram and developed diagram of single-layer winding4.2 Composition of

2、AC winding For example:the winding of a transformer is the three-phase single-layer equal-element windings,and the number of pole pairs p=2,the number of slots Z=24,parallel branch for each phase a=1,please try to draw the developed winding diagram.Solve:(1)calculate the parameters 2.Single-layer eq

3、ual-element winding III.Three-phase single-layer windings4.2 Composition of AC winding slotslot(2)slot number distribution of each phase belt Area of the first pair of magnetic polesPhase beltA1Z1B1X1C1Y1Slot number1,23,45,67,89,1011,12Area of the second pair of magnetic polesPhase beltA2Z2B2X2C2Y2S

4、lot number13,1415,1617,1819,2021,2223,244.2 Composition of AC windingIII.Three-phase single-layer windings2.Single-layer equal-element winding(3)Developed winding diagram 4.2 Composition of AC windingIII.Three-phase single-layer windings2.Single-layer equal-element winding When parallel branch numbe

5、r a=1,all the coil assemblies of phase A are connected in series according to the principle of EMF addition,that is,head end is connected to tail end.When parallel branch number a=2,the coil assemblies of A1 phase belt and X1 phase belt are connected in series according to EMF addition,that is,head

6、end is connected to tail end;the coil assemblies of A2 phase belt and X2 phase belt are connected in series according to EMF addition,that is,head end is connected to tail end;then the two branches are connected in parallel,that is head end to head end,tail end to tail end.4.2 Composition of AC winding 3.Terminal connection law of single layer winding(take phase A for instance)III.Three-phase single-layer windings4.2 Composition of AC winding 4.Concentric type winding(phase A)III.Three-phase single-layer windingsTHANKS FOR WATCHING!