Problem 1:Determine the induced armature voltage in the DC machine operating as a motor and running...

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Problem 1:Determine the induced armature voltage in the DC machine operating as a motor and running at1800 rpm with flux equal to 0.05 Wb and constant K as 24.Problem 2:Problem 3:A 240-V 100-A DC motor has both shunt and series windings. Its characteristics areRA = 0.14 Ohm, NF = 1500 turns, RS = 0.05 Ohm, NSE = 15 turns, RF = 200 Ohm, nm = 1800rpm, Radj = 0 to 300 Ohm, currently set to 120 Ohm. Use EA Vs If given below if needed.A) The motor described above is connected as shunt motor1. What is the no load speed of this motor when Radj = 120 Ohm2. What is its full-load speed?B) The motor described above is now connected as cumulatively compounded DC motor withRadj = 120 Ohm  	What is the full-load speed of this motor?  
	
Document Preview: Problem 1:Determine the induced armature voltage in the DC machine operating as a motor and running at1800 rpm with flux equal to 0.05 Wb and constant K as 24.Problem 2:Problem 3:A 240-V 100-A DC motor has both shunt and series windings. Its characteristics areRA = 0.14 Ohm, NF = 1500 turns, RS = 0.05 Ohm, NSE = 15 turns, RF = 200 Ohm, nm = 1800rpm, Radj = 0 to 300 Ohm, currently set to 120 Ohm. Use EA Vs If given below if needed.A) The motor described above is connected as shunt motor1. What is the no load speed of this motor when Radj = 120 Ohm2. What is its full-load speed?B) The motor described above is now connected as cumulatively compounded DC motor withRadj = 120 OhmWhat is the full-load speed of this motor?

Robert · Accepted Answer

Solution 1: 
Induced armature voltage is given by: 
   
   
  
 
Hence flux is :
Speed is
           
    
  

Hence induced armature voltage is 36 V 
Solution 2: 
No load test provides us 
i) Constant core losses and friction and windage losses 
ii) Armature  copper and brush losses 
Now armature losses are:
Total load current is:
Constant core losses are:
Now taking blocked rotor test  
Losses in field is:
Generated voltage is:
Power at full load is:
Stray loss is:

Problem 1: Determine the induced armature voltage in the DC machine operating as a motor and running at 1800 rpm with flux equal to 0.05 Wb and constant K as 24. Problem 2: Problem 3: A 240-V 100-A DC...

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