Edgerton Lab Notebook T-1, Page 04:
October 13, 1927
- Page start date:
- October 13, 1927
- Content type:
- diagram,notes
- Transcription:
- 10-13-27
Speed Control by the Thyratron Tube.
A mercury arc rectifier is made by the General Electric Co which has grids around the anodes. This rectifier is called the thyratron. The sketch shows the general layout of the tube.
The circuit shown below was devised to control speed of the D.C. motor by varying its field current.
[Circuit diagram with annotations as listed below]
Tuned for 60 cyc.
A tuned circuit is put on the alternator. This is a parallel circuit of inductance and capacitance and is tuned for 60 cycles.
A current transformer is put in the line going to the tuned circuit. Its secondary is connected in series with the primary of the grid potential transformer.
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The whole scheme of control is to sift the phase relation between the grid potential and the anode potential. These are shown on a vector diagram. To the grid potential is added a potential which depends upon the frequency. This comes from the C.T. in the tuned circuit
- Keywords:
- anode; cathode; circuit; General electric; mercury; phase; schematic; sketches; speed control; thyratron; transformer
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