System Design

Developing circuit for Bifurcated winding Induction machine:

To start with, Dymola library has Induction Machine. The differences in the topology was to bifurcate the stator into 2 part, 1 for space phasor excitation it was already available in the dymola library the modification was to make available 2nd part of bifurcated winding to connect the Load which is Space phasor for load. 

Challenges and failures during developing BWIG machine:

The Challenge was to create a space vector part for load in Stator. Earlier tried many things among them one was to redistribute the air gap of stator and make available space vector to load. Figure 4.3 Shows the space phasor distribution of normal induction machine where it consist space phasor stator and space phasor rotor. And a flange for rotation. Using this Space phasor distribution it has been modified by adding one more Space Phasor at Stator end. 

Figure 4.4 shows the space phasor distribution of BWIG where Stator distribution is divided into two part. 

They are: 

1. Space phasor for Excitation part. 

2. Space phasor for Load part. But this model is failed because it was unable to connect Main field flux with the bifurcated load part. And also the mutual inductance between the Excitation Inductance and Load end inductances was not able to Calculate or specify. 

Existing Induction Machine Circuit:

Figure 4.5 shows Existing Induction machine which has only Stator winding. The circuit of the Normal Induction Machine available in the Behavior Modellica. Where in the circuit we can figure out Stator and rotor parts and it also specifies the losses that is Stator core loss stray loss and mechanical losses. With the help of this circuit the BWIG circuit can be modelled and it is shown in the below section. 

Partial Induction Machine circuit:

Modification of Induction machine starts with available Partial Induction Machine figure 4.6 shows the circuit of partial Induction Machine. In this machine. only single stator part for Excitation exists.There are no Rotor part and Air gap.

Components connected to Partial Induction Machine to create BWIG circuit:

Figure 4.7 shows the Behavior Modelling Circuit for the BWIG. Which is modified from available Induction machine circuit in Behavior Modelling itself. The modification in the circuit of Bifurcation of Stator winding one is to supply Excitation voltage to the Induction machine and another is connected to the load which are represented in circuit as two parallel path through air gap inductance Lssigma. The mutual inductance of this is converted from phasor form to a b c that is 2-phase to 3-phase. The Stator core losses are considered at both side of the STATOR. The available rotor model is added to the circuit along with the air gap. It is been considered lossless machine circuit for simulation