Will it work?

It will turn the generator.  The generator still produces less energy than input to the motor.  The spring coupling at the end of the day is just a coupling.  It has no effect on the amount of energy it takes to turn the generator under load, nor the amount of energy that the motor draws in order to turn a given load.

Quote from: MarkE on July 23, 2014, 02:22:12 AM
It will turn the generator.  The generator still produces less energy than input to the motor.  The spring coupling at the end of the day is just a coupling.  It has no effect on the amount of energy it takes to turn the generator under load, nor the amount of energy that the motor draws in order to turn a given load.

What about mechanical advantage with same speed?  Where and why it will be lost?
Input power at the motor flange will be 2∏NT₁ and output power at the generator flange will be 2∏NT₂    and  T₂ will be far more greater than T₁ because of mechanical advantage. 
Since both are rotating at same speed the time of energy input and output also remain the same hence there should be a net gain in energy also.      Power, which is energy per second  also  gets  magnified.   

Quote from: vineet_kiran on July 23, 2014, 04:11:51 AM


What about mechanical advantage with same speed?  Where and why it will be lost?
Input power at the motor flange will be 2∏NT₁ and output power at the generator flange will be 2∏NT₂    and  T₂ will be far more greater than T₁ because of mechanical advantage. 
Since both are rotating at same speed the time of energy input and output also remain the same hence there should be a net gain in energy also.      Power, which is energy per second  also  gets  magnified.   

The generator is less than 100% efficient.  The motor is less than 100% efficient.  The spring coupling is less than 100% efficient.  The only energy available to the generator is frm the motor through the spring coupling.  Storing up some energy in the spring by winding it up does nothing to produce energy, or improve efficiency. 

Quote from: MarkE on July 23, 2014, 05:42:10 AM
The generator is less than 100% efficient.  The motor is less than 100% efficient.  The spring coupling is less than 100% efficient.  The only energy available to the generator is frm the motor through the spring coupling.  Storing up some energy in the spring by winding it up does nothing to produce energy, or improve efficiency.

You are totally mistaken. 

I am not using the energy of spring.  I am rotating a larger diameter pulley by a small diameter pulley with same speed to get mechanical  advantage ensuring that the mechanical advantage is not lost in time as in the case of normal pulley arrangement.

Efficency of generator or motor doesnot come into picture here at all.