calculation

[jerryyu]

how do you calculate how many revolutions a certain motor will make under a certain time frame and voltages? Or how do you calculate how much electricity will be produced from a dynamo under a certain amount of revolution? Or how much energy will be produced from an electric generator under (certain) motion?

 

I want to figure those things out but don't know how to start.

 

(sorry if I put this on the wrong post;it just seem more suitable than all the other one)

[Danijel Gorupec]

The answer to the first question depends on many things: motor construction/type, motor load... For example, number of revolutions of a brushed DC motor with permanent magnet is approx. proportional to the voltage supplied. On the other hand, the speed of an (non-loaded) asynchronous AC (cage) motor or a synchronous AC motor doesn't depent much on the voltage supplied, but on the frequency instead.

 

In the second two questoions you ask about energy... this is easy... The efficinecy of a modern dinamo/generator is quite high and therefore the produced electrical energy / power is just a bit less than the mechanical energy / power you put into.