

APPENDIX B 



DATA CONCERNING SYNCHRONOUS MOTORS OF AMERICAN 



MANUFACTURE 



THE Tables A and B, given herein below, contain data charac- 

 teristic of good American practice in the manufacture of synchro- 

 nous motors. In comparing these data with those characteristic 

 of good European practice, as given in Part I, on page 5, due allow- 

 ance should be made for the rating conditions in the two cases. 

 Thus, the normal frequency is 60 for the American motors, and 

 40 for the European motors; and the kilovolt-amperes per horse- 

 power are 746 in America and 736 in Europe. The power-factor 

 assumed as a basis for rating is equal to unity for American motors. 

 It is presumably the same, though not stated, for European motors. 



TABLE A SINGLE-PHASE AND THREE-PHASE SYNCHRONOUS 

 MOTORS OF AMERICAN MANUFACTURE 



* Self-excited. 



t Separately excited. 



J Has direct-connected exciter. 



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