1000 



Voltaic Electricity. Section 7: Induction Currents. 



No. 62 896- 



62898. 1:4. 



62 899. 1 : 4. 



Alternating and Three-phase Current. 



Universal Dynamos for generating Direct Current, Alternating and Three-phase Current: see 

 pp. 992 and 994. 



62,896. Alternating and Three-phase Current Machine after Weinhold, Figure (W. D. 

 Fig. 578); can be used as a generator for single and three-phase current; as a Synchronous 

 Motor or as an Asynchronous Motor (Induction Motor) for Alternating or Three-phase 

 Current 



The Machine can easily be taken apart and a 4-pole rotor inserted for excitation with Direct 

 Current (for using the machine as a generator or synchronous motor for mono-phase or three-phase 

 current); or a short-circuited rotor can be inserted (for using the machine as an asynchronous motor 

 for mono-phase or three-phase current). 



This Machine is excellently adapted for demonstrating the mode of action of the model machinas 

 actually used in practice, as its construction is in accordance with that of such machines. 



Lantern Slides for explaining the connections and method of working of this small machine: 

 gee No. 62,901. 



62.897. Driving Device for hand drive, for above 



As a driving motor for above we can recommend No. 51,972 or 51,973, p. 998 

 (cf. the illustration). 



62.898. Model of a Three-phase Motor, after Weinhold, Figure (W. D. Fig. 595) . . . 



This Model is used for studying the behaviour of a three-phase motor when various types of 

 rotor are inserted. The model can be operated with machine No. 62,896 as used as a three-phase 

 dynamo. Supplied with the model are a squirrel-cage rotor composed of laminated iron sheets and 

 provided with copper bars; also a copperless rotor of sheet iron with paper layers between, and held 

 together with four brass rivets; a solid wrought iron rotor and a hollow drum composed of sheet iron. 



62.899. Reversing Switch for above, Figure (W. D. Fig. 599), to enable the model to be 



used also as a mono-phase motor 0. 16. 



62.900. Polarisation Battery for starting or driving Motor No. 62,898 with mono-phase A. C. 

 (W. D. p. 928) 



Cl. 4709, 

 5558, 55S7. 



