Edgerton Lab Notebook T-1, Page 49:
October 02, 1930
- Page start date:
- October 02, 1930
- Content type:
- diagram,notes
- Transcription:
- Speed Regulation of A-C Motors by means of controlled Rectifiers
The motor used is a wound motor induction motor. The winding on both sides of the gap are to be polyphase. One winding will be fed by alternating current (polyphase) and thus set up a rotating field. The other winding if fed with d-c will cause the motion to run synchronously. The d-c is in one winding only.
[diagram]
The full wave rectifiers as shown in the sketch (A, B, C) are able to supply d-c to each of the phases. There is no limit to the number of phases.
Now if the phases are fed in rotation at a corresponding speed with respect to the rotor. This field will lead to stay in step with the rotating field due to the winding on the other side of the gap. The rotor will run at a speed which corresponds to the sum of the frequency of the supply and the frequency of field transfer or it will run at a frequency which corresponds to the difference of these frequencies.
By this means the rotor can be made to operate at speeds both above and below the synchronous.
- Keywords:
- A-C motor; polyphase; speed regulation; synchronous
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