Series Motor

Series Motor

Figure 7.43 shows the connection diagram of a dc series motor. The speed for this motor is (refer to Eq. (7.48)).

 

Series Motor

Series Motor

Series Motor

These relationships are plotted in Figs 7.44(a) and (b). Saturation and armature reaction demagnetization both cause the flux/pole to increase (with respect to /a) at a rate slower than in the assumed linear relationship. Actual characteristics are plotted in dotted lines in Fig. 7.44(a) and (b).

 

Series Motor

It is easily observed that at no-load, the motor current and hence the flux/pole tends to zero and as a consequence (Eq. (7.58)), the motor speed tends to increase to

 

 

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