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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).
Technical description and diagram of the 'Newtons' voltage regulator, with comparisons to other types.

Identifier  ExFiles\Box 166\2\  img256
Date  15th April 1941
  
To Ev.{Ivan Evernden - coachwork} from Rm{William Robotham - Chief Engineer}/RC.{R. Childs}

"NEWTONS" VOLTAGE REGULATOR.

DIAGRAM LABELS:
ELECTRO MAGNET
FROG SPRING
CARBON DISCS THREADED ON PORCELAIN ROD.
CARBON WASHER INSULATED FROM FRAME.
PORCELAIN TUBE
ARMATURE
EXCITING COIL

MAIN TEXT:
The Newton voltage regulator is a carbon pile regulator.

The action is to control the strength of field of a generator by introducing a variable resistance in series with the field of the generator, and so weakening the field strength.

The variation of the resistance is obtained by means of a carbon pile. The change of pressure on the carbon pile is controlled by a frog-spring working against the magnetic attraction of an electro-magnet.

The Newton unit consists of two piles operated by two electro-magnets; the carbon piles are electrically connected in series with each other and the generator field.

The strength of one magnet is controlled by a voltage coil connected across the terminals of the generator, while the other is controlled by a current coil in series with the load. Thus, the regulation depends on both the voltage of the generator and the current in the circuit. (Our own regulator is current compensated).

The operation of such a unit is very smooth and reliable, but the design makes it rather bulky.

There are no contacts to pit or get out of adjustment.

Newtons are going to try and produce a small unit suitable for automobile work. We will keep in touch with them and test one out when it is ready. This will not be done for some time, since they are very busy on aero work.

Our present single contact type Lucas regulator, although not so ideal as the above in its action, is proving very reliable and is, at the same time, small and economical.

Rm{William Robotham - Chief Engineer}/RC.{R. Childs}
  
  


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