4. DC machines

#### 4.1. Introduction

The graphical user interface for three-phase transformer is shown in Figure 10.

Figure 11.

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Figure 9. Single-phase transformer performance.

Figure 10. Graphical user interface for three-phase transformer.

Here, the user has to choose the type of connection. An example of calculation is shown in

This chapter discusses the types of DC machines with implementation of graphical user interface and plotting the torque speed characteristics and terminal characteristic for each DC machine [5].

In DC machines, the armature or loops of the rotor can be connected in many ways to the segments of the commutators. The rotor output voltage and the number of parallel current paths are affected by these several ways of connection [2, 5].

In any given machine, the voltage induced in EA depends on three factors:


The voltage of the real machine armature is given by

$$E\_A = \frac{\text{ZP}}{2\pi a} \phi\\\omega\_m = \frac{\text{ZP}}{2\pi a} \phi \frac{2\pi}{60} n\_m \tag{28}$$

In any DC machine, the torque depends on three factors:


The torque on the armature of a real machine is

$$T\_{\rm ind} = \frac{\rm ZP}{2\pi a} \phi I\_A \tag{29}$$
