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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The operation of a Bijur Vibrator Regulator and Dynamo.

Identifier  ExFiles\Box 31\1\  Scan147
Date  14th November 1922 guessed
  
No. (3). Bijur Vibrator Regulator & Dynamo.

Vibrating metallic contacte in series with field winding, and shunted by a resistance. Field winding also shunted by another resistance. Single operating coil on voltage only in the first instance, but later a series coil has been added as shown dotted on the diagram. (For diagram see attached sheet).

There is a top speed limit to the operation of this regulator when the speed is high enough for the excitation with contacts open (and therefore resistance in series with field of dynamo) to produce the regulated voltage.
  
  


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