Time: 20:00
Important one liner (Construction of DC Machine)
- The stator frame supports the machine and houses the field windings.
- Field poles produce the magnetic field required for operation.
- Pole cores are laminated to minimize eddy current losses.
- Field windings are wound around pole cores to generate a uniform flux.
- The armature core carries the armature conductors and provides a path for flux.
- Armature windings are placed in slots on the armature core for EMF induction.
- The commutator converts AC induced in the armature into DC output.
- Commutator segments are insulated by mica to prevent short circuits.
- Brushes maintain sliding electrical contact with the commutator.
- Brush holders ensure correct brush pressure and alignment.
- The shaft transmits mechanical power from the armature to external load.
- Bearings support the rotating shaft and reduce friction.
- End shields cover the ends of the machine and protect internal parts.
- Yoke provides mechanical support and carries magnetic flux return.
- Insulation materials prevent electrical breakdown between components.
- Cooling ducts remove heat generated during operation.
- Ventilation fans improve airflow and maintain temperature.
- Terminal board connects external supply to field and armature winding.
- Commutating poles reduce sparking at the brushes during commutation.
- Interpoles are placed between main poles for smoother commutation.
- DC machines are classified as shunt, series, or compound based on winding connections.
- Laminations are insulated stacks to reduce hysteresis losses.
- Neutral plane placement affects brush positioning and commutation quality.
Keywords: Construction of DC machine, DC motor parts, armature winding, commutator design, field winding structure, DC machine lamination, interpole function, commutating pole, DC generator components, yoke in DC machine, brush holder assembly, neutral plane adjustment, DC machine cooling, DC machine classification