Question

Question 1 (a) Briefly explain the construction and operation of a DC Shunt motor.

Answer 1

The shunt dc motor is similar construction as comparison to dc motor. The shunt motor has the same Dc motor structure; stator, rotor (armature) & commutator.
The shunt field installation is done with several turns on the coil and those times are made with a thin wire, and the shunt surfing size is very small and cannot be carried at the moment too much.
The armature can support a high current because it has a high gauge wire, this high speed passes through the call storage area when starting the car or when running at low speed.

Circuit Diagram

The shunt winding is parallel with armature winding. The value of shunt winding resistance is very high so very low current flow through it

Ish la 11 + Shunt Field Rsh ER V LOAD Armature

working Principle

The operating principle of DC Shunt Motor is that, when the DC motor is turned on, then Direct current moves across the stator and rotor. This current flow will produce two fields namely pole and armature.
In the air space between the armature pieces and the field, there are two magnetic fields, and they will respond to each joint by opening the armature.
The commutator transmits the direction of the current armature flow to normal locations. The armature field is therefore rotated by a constant pole field, continuing to rotate the armature within the same direction.

The back emf generated in the motor

Eb = (PφNZ) / 60A V

Where P = no. of poles

Φ= Flux for each pole within Wb

N = Motor’s speed in RPM

Z = No. of armature conductors

A = No. of parallel conductor

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