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).
Letter to Messrs Royce Ltd detailing conclusions from Mr. Bentley's visit regarding the design of electro-motors.
| Identifier | Morton\M7\ img010 | |
| Date | 12th August 1912 | |
| Copy for Mr Bentley Westwood, Beacon Road West, Crowborough, Sussex, 12th August 1912. Messrs Royce Ld., Trafford Park, Manchester. Dear Sirs, With reference to Mr Bentley's stay here, the following conclusions were arrived at during his visit. Standard electro-motors of moderate size and speed are best made 4 pole inter-pole type, and for economy of space & weight the yoke to be of octagon form the extremity of which is turned inwards so that the holes to receive the bearings can be drilled & tapped right through the steel. The magnet limbs of both the main magnets and the inter poles can be cast solid with the yoke. The pole shoes which are laminated on the main magnets and solid on the inter poles would in each case be secured by long bolts passing through the length of the magnets. The drilling of these long holes presents some extra work which is well justified by the advantage of seeing whether the magnet limb is sound, and it meets Admiralty standard requirements and has many other substantial advantages. Referring to the insulation of the armature and | ||