XPost: rec.crafts.metalworking   
   From: dhky@shaw.ca   
      
   On 19/11/2013 4:29 PM, Lloyd E. Sponenburgh wrote:   
   > Induction motors - that are designed to be motors - make lousy generators,   
   > regardless of how well 'tuned' their capacitive excitations circuits are,   
   > if they're used for any varying loads, or - for the most part - on any   
   > inductive loads.   
   >   
   > They're about useless for anything but purely resistive loads like   
   > incandescent lights or resistive-limited battery charging.   
   >   
   > Lloyd   
   >   
   In proper circumstances they work well- such situations would be similar   
   to the Scottish application where advantage can be taken of small   
   streams, using a turbine and induction motor. The motor can be run up as   
   a motor-then the turbine gates are opened(or in reverse order). No   
   synchronizing or voltage control needed. In such a  remote application,   
   it is simpler and cheaper than a synchronous machine.   
   True- they must have a source of excitation and need to draw reactive   
   from the grid or grid + capacitors and in the latter case varying loads   
   are a problem. They cannot supply reactive to any load, nor can they   
   (without some other source of reactive) operate if the grid connection   
   goes down.   
      
      
   --   
   Don Kelly   
   remove the cross to reply   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)