To find Langsdorf’s original text legally, consider:
For three-phase currents ( i_a = I_m \cos(\omega t) ), ( i_b = I_m \cos(\omega t - 120^\circ) ), ( i_c = I_m \cos(\omega t - 240^\circ) ) in windings spaced ( 120^\circ ) apart, the resultant magnetomotive force (MMF) is: [ F(\phi, t) = \frac32 F_\textmax \cos(\omega t - \phi) ] where ( \phi ) is the spatial angle. This represents a wave traveling at angular velocity ( \omega ). Theory-alternating-current-machines-alexander-langsdorf-pdf
The textbook is designed to provide a comprehensive discussion of physical relations before diving into mathematical analysis via vector diagrams and complex algebra. Principles of alternating current machinery - djm.cc To find Langsdorf’s original text legally, consider: For
Langsdorf provides a comprehensive mathematical derivation of the induction motor. To find Langsdorf’s original text legally