Experiments with a universal motor in shunt connection

The experiment P3.5.3.3 takes a look at the so-called universal motor, in which the stator and rotor fields are electrically excited. The stator and rotor coils are connected in series (“serieswound”) or in parallel (“shunt-wound”) to a common voltage source. This motor can be driven both with DC and AC voltage, as the torque acting on the rotor remains unchanged when the polarity is reversed. The torque curve M(f) is recorded for both circuits. The experiment shows that the speed of the shuntwound motor is less dependent on the load than that of the series-wound motor.