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Additional resources for Practical Electric Motor Handbook
Example text
Reversing the rotation of a series motor cannot be brought about by simply reversing the polarity of the applied voltage. Doing so will reverse the current flow in both armature and field and the net result will be that torque will continue to be exerted in the same direction. Keversing current flow in either the armature or in the series field winding will do the trick. It may not always be convenient to get at the two leads of the series winding. Obligingly, motor manufacturers make two-winding series motors.
Field current source ==,. =. / Shunt field winding Very small AC voltage monitored across field - winding despite loading of motor ,p L. Oscilloscope Fig. 2 Simple set-up to disprove transformer relationship between armature and field winding. Despite the fact that the armature carries alternating current and is physically close to the field poles, it does not act as a transformer primary with the field winding as secondary. Thus, in the above set-up, very little AC voltage is monitored across the field winding.
Most important, however, are the insights to be derived from an understanding of its operation, see Fig. 1. As with most electric motors, this dynamo is either a motor or a generator depending upon whether the input power is electrical, or mechanical. In either case as with nearly all other machines motor and generator action also occur simultaneously. A significant difference from other motors is that the disc-type armature carries only DC; in other motors, whether DC or AC, the armature has alternating current in it and for this reason, no commutator is needed.