High-Frequency Alternator 



303 



1000 revolutions per second, attempts were made to increase 

 its speed ; but these failed owing to the large power required 

 seriously overloading the motor. 



In order to find out why such a large increase o£ power 

 was necessary to drive the motor and alternator at higher 

 speeds, the power supplied to the motor-armature was measured. 

 At a motor speed of 800 revolutions per minute, which would 

 correspond, if the alternator were connected, with a speed of 

 its spindle of 567 revolutions per second, the power required 

 to drive each part was as follows, 



Table I. 



Watts. 

 63 



Motor alone, uo bicycle-wheels or alternator . . 



„ with one bicycle-wheel only Ill 



„ „ both bicycle-wheels bolted together. . . 162 



„ ,, „ and alternator ... . 532 



Curves III. — Between Speed and Power required to drive: — Motor 

 alone ; Motor and one Bicycle-wheel ; Motor and both Bicycle-wheels. 



600 Watts 



ftWS.PER 



00 MINUTE. 



SPEED OF MOTOR 



The power required to drive the motor alone and with one 

 or two wheels at higher speeds is given in Curves TIL, which 

 shows how very rapidly the power required to drive the 

 Bicycle-wheels increases with the speed even without the 



