Hi,   
      
   I was wondering if you might be able to help me with the following question.   
      
   An electric drive operates in regenerative braking mode and has a regenerative   
   torque of -50Nm @ a speed of 4775rpm (500 rad/s.   
      
   The electric drive features a three-phase four-pole PMAC machine. This machine   
   can be modelled as Rs (per phase stator resistense = 0.01ohms), Ls (per phase   
   synchronous inductance = 0.1mH) and the machines per phase back emf in series.   
      
   The machine constant (k) is 0.07V/rad/s and the no load torque is 5Nm.   
      
   The phase current is vector controlled to be 180 degrees out of phase with the   
   back emf when in regenerative mode.   
      
   The battery has a no load voltage of 360V and an internal resistence of 0.1   
   ohms   
      
   The inverter is 97% efficient.   
      
   How would i get the: (i)per phase voltage and current output by the motor,   
   (ii) moter power factor and efficiency and (iii) battery current and battery   
   power.   
      
      
   any help you could give me would be greatly appreciated especially with how   
   the current being 180 degrees out of phase with the back emf would effect   
   things.   
      
   kind regards,   
   John   
      
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