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).
Standard for defining the direction of rotation for electrical machines to avoid ambiguity.
| Identifier | ExFiles\Box 4\5\ 05-page093 | |
| Date | 10th November 1920 | |
| X430 10.11.20 ROTATION OF ELECTRICAL MACHINES. In order to avoid ambiguity we will always speak of rotations in the following manner :- A positive rotation is one which is clockwise (right-handed) when viewed on the driving end of the machine, i.e. anti-clockwise or mathematically positive when viewed on the commutator or contact breaker end of the machine. A negative rotation is one which is anti- clockwise (left-handed) when viewed on the driving end of the machine, i.e. clockwise or mathematically negative when viewed on the commutator or contact breaker end of the machine. Further, all diagrams must be as viewed from the commutator or contact breaker end. EPC. | ||