CONSTRUCTIONAL DETAILS OF A DC MACHINE
In this section, we will be talking about the main parts
used in dc machines.
- · An armature consisting of a number of conductors suitably placed and connected so as to form a closed loop. Generally armatures are the rotating part of a machine and is termed as rotor.An armature is a cylindrical body rotating in space between the north and south pole comprising of slots,teeth,core and windings inside slots.
- · A field system to produce the required magnetic field.It is usually the stationary part in a machine and is termed as stator. It consist of pole body,pole shoe and field windings.
- · The stator and rotor are separated by a small air gap which forms the main criteria for determining the efficiency of a machine.
- · A commutator consisting of a large number of segments which are well insulated from each other.
- · Commutating poles or interpoles which are inter-posed between the main poles to ensure sparkless operation of the brushes at the commutator under the loaded conditions of machines.
- · Yoke which acts as a mechanical support and as a path for the magnetic flux to flow.
- · Brushes to collect the current from the rotating commutator or to lead current towards it in case of dc motor.
- · Bearing-to support the rotating parts and to allow smooth motion with little friction .
- · Arrangement of cooling-To keep the machine protected from heating up.
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