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In this video you will find the resolution of an example of a DC motor with series excitation. The interest of this type of assembly compared to other excitations such as separate or shunt is that the flux is not constant but variable depending on the load and therefore the induced supply current which is the same as the excitation current hence the obligation to place a rheostat in series in the circuit to limit the starting current. You will learn to calculate this very important current to avoid damaging your machine when starting. In addition you will calculate the electromotive force of the motor, the absorbed power, the power dissipated by the Joule effect, the useful power and torque and the efficiency. Do not hesitate to leave me your opinion in the comments. • Video N° 426 Solving exercise motor... / @fmecat1103