Choice of rotor diameter and performance of polyphase induction motors

Theodore Hoock
1911 Proceedings of the American Institute of Electrical Engineers  
The theoretical part of polyphase induction motor design has been treated thoroughly, analytically and graphically,* and there is very little left for further investigation. In consideration of the great importance of this type of motor very little has been said about the leading points in the practical design. In laying out a new line of induction motors it is desirable to have a rational method for determining the influence of the rotor diameter upon the performance rather than using the
more » ... than using the longer procedure of designing a number of motors under different as sumptions and comparing the final results. The performance is so rigidly interlinked with the mechanical dimensions and the windings that a theoretical design can easily be made which will show clearly the influence of the chosen constants upon the motor characteristic. The derived formulae in this paper are not intended to super sede the detailed design but they should be used for the first layout. On the other hand the designer will find the results of the cal culations very convenient for comparison and assistance in choosing the proper frame for certain guarantees to be met. It is undoubtedly of great use in the further development to analyze the design on a practical basis in order to find the limitations and the influence of the variables. It is fully demonstrated by tests that the D 2 li of standard speed motors is not limited by the temperature rise but by the
doi:10.1109/paiee.1911.6660587 fatcat:iotgctunp5e27fqbau525atrlu