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Why pole face are chamfered in dc machine?
in order to reduce armature reaction.
What are the effect of armature reaction in DC machine and how the armature reaction is minimise?
Armature reaction is the interaction between the magnetic flux produced by armature current and that of the main magnetic field in an electric motor or generator.
What are compensating winding?
compensating windings are used to overcome armature reaction
How do you reduce armature reaction?
By Using Interpoles (Auxillary Poles).......
What is armature reactions in a synchronous machine?
Armature reaction is the effect of armature flux on the flux generated by the fied windings.Cross magnetisation and Demagnetising are its consequences.
What is armature reaction in dc motor?
Armature reaction is effect of armature flux on main field flux. Basically there are two windings in a dc motor - Armature winding (on stator) and field winding (on rotor). When we excite the field winding, it produces a flux which links with the armature. This causes an emf and hence a current in the armature. This current in armature produces another flux which lags the main flux. This is referred to as armature reaction. It has two effects on the machine: 1. Demagnetising effect: It reduces the strength of the main flux. 2. Crossmagnetising effect: Its effect is that it bends/distortes the the main flux line along the conductor
How the effect of armature reaction can be minimized in dc machines?
The effect of armature reaction in DC machines can be minimized by using various techniques. One common method is to employ compensating windings, which are placed in the machine to counteract the armature's magnetic field and reduce distortion. Additionally, using interpoles (small auxiliary poles) helps maintain a uniform magnetic field by providing a corrective flux that counteracts armature reaction. Proper design and careful selection of materials can also enhance performance and minimize these effects.
What is the purpose of Inter-pole fitted in a DC generator?
to chancel the effect of the armature reaction.
Why are the compensating winding used in dc motor?
compensating winding is used for equal load sharing of two generators running in parallel. while interpole winding is used to minimise the effect of armature reaction by supporting the main field.
What is armature reaction in dc machines?
Armature reaction is the phenomenon in DC machines where the magnetic field produced by the current flowing in the armature windings interacts with the main magnetic field produced by the field windings. This interaction can distort the main magnetic field, causing changes in the machine's performance such as voltage regulation and torque production. Measures such as interpoles or compensating windings are used to counteract the effects of armature reaction in DC machines.
What is mean by armature reaction?
armature reaction means when load is added to the armature then current is passed through armature conductors then in armature creates flux. It is demagnetize and cross magnetize the main field flux. in other ward it is effect of armature field on main field.
What is the use of interpoles in dc machine?
Interpoles are similar to the main field poles and located on the yoke between the main field poles. They have windings in series with the armature winding. Interpoles have the function of reducing the armature reaction effect in the commutating zone. They eliminate the need to shift the brush assembly.
