An increased number of armature coils increases the armature reaction.
#AC MOTOR WINDING THEORY SERIES#
Naturally, the armature of an ac series motor becomes unusually larger than the corresponding (dc series motor. (c) In order to obtain the required torque with low field flux, number of armature coils is increased. This is achieved by operating the iron at low flux densities (using increased pole area) and, therefore, at high permeabilities and by using a very short air gap. Hence, to reduce the reactance of the field winding, if possible, a low-frequency (as low as $\text$. Still, it is necessary to reduce the reactance of the field winding if the power factor is to be reasonably high. (b) The field flux cannot be reduced or neutralized drastically for the purpose of improving the power factor, for its presence is essential to produce the required torque. (a) Eddy-current loss is minimized by laminating the entire field structure.
![ac motor winding theory ac motor winding theory](https://ars.els-cdn.com/content/image/3-s2.0-B978008051958650010X-f07-14-9780080519586.jpg)
Design Considerations for an AC Series Motorįor operating the dc series motor satisfactorily on ac supply, the following modifications in the design are generally incorporated : If an ordinary dc series motor is connected to an ac supply, because of simultaneous reversal of field and armature currents, it will develop a unidirectional torque and as a result of this, its armature will rotate.
![ac motor winding theory ac motor winding theory](https://i.stack.imgur.com/AHLSv.png)
In this topic, you study AC Series Motor – Theory, Design, Characteristics, Disadvantages & Applications.ĪC Series Motor is a commutator-type motor which is able to work on both dc and single phase ac supply.