In case of DC motors Speed ∝ Back emf(Eb)/flux(φ)
The field winding in shunt motor is connected in parallel to the armature winding and the supply.
If we assume that the supply voltage is constant then flux also becomes constant.
At the rated speed the back emf also becomes nearly constant if the load is same.
Hence the speed of the shunt motor can be assumed ALMOST constant under normal running conditions .
The motor speed drops slowly with increasing torque value.same applies with the load current.
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