How to Connect A DC Shunt Motor

D.C. Shunt motor-

The shunt winding of this motor is made of thin wire and more turns. Shunt winding has higher resistance due to thinner wire and more turns.

The shunt field winding of this motor is connected parallel to the armature and supply voltage. Due to this the flux of its shunt field winding is constant and the motor runs at the same speed at each load. Its starting torque is 1.5 times to 2 times the total torque.

Load current of this motor 

I_L = I_sh + I_a 

I_a = I_L-V_sh 

While I_sh = V / R_sh 

Here- 

V = shunt field winding voltage 
I_L = load current 
I_sh = current of shunt field 
R_sh = Resistance of shunt field 
Voltage drop in armature- I_aR_a Volt
E_b = V-I_aR_a 
I_a = (V-E_b) / R_a 

Power generated in the armature = E_b I_a Watt

Copper losses in armature = I_a²R_a 

Copper losses in shunt area = I_sh² R_sh

Use of shunt motor- 
The speed of the shunt motor is considered to be constant, so the use of this motor is lathe machine, fan, CNC. Used in laths and milling.