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The delay of the commutation occurs due base cause of emf induced due to
- a)self inductance, mutual inductance
- b)self inductance
- c)mutual inductance
- d)leakage inductance
Correct answer is option 'A'. Can you explain this answer?
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The delay of the commutation occurs due base cause of emf induced due ...
The commutation in dc machines is delayed because of the emf induced in the coils and the mutual interaction of the field with neighbour coils.
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The delay of the commutation occurs due base cause of emf induced due ...
The Cause of Delay in Commutation
The delay in commutation in electrical circuits occurs due to the base cause of electromotive force (EMF) induced. This EMF is induced primarily due to two factors - self-inductance and mutual inductance.
1. Self-Inductance:
Self-inductance is the property of an electrical circuit or component to oppose any change in the current flowing through it. When a current flows through a coil or an inductive component, it creates a magnetic field around it. This magnetic field induces an EMF in the same coil or component, which opposes the change in the current. This self-induced EMF is known as back EMF.
During commutation, when the current in a DC machine is reversed, the back EMF due to self-inductance opposes this change. This back EMF tends to maintain the current in the same direction, which hinders the reversal of current. This opposition from self-inductance leads to a delay in commutation.
2. Mutual Inductance:
Mutual inductance is the property of two inductive components or circuits to influence each other's magnetic fields. In electrical machines, mutual inductance occurs between the armature winding and the field winding. When the current in the armature winding is reversed, it induces an EMF in the field winding due to mutual inductance.
Similar to self-inductance, this induced EMF opposes the change in current direction, causing a delay in commutation. The mutual inductance between the armature and field windings plays a significant role in the delay of commutation.
Conclusion:
In conclusion, the delay in commutation occurs primarily due to the base cause of EMF induced. This EMF is induced due to both self-inductance and mutual inductance. Self-inductance creates a back EMF that opposes the reversal of current, while mutual inductance induces an opposing EMF in the field winding. These factors contribute to the delay in commutation, which is a crucial aspect of DC machines and electrical circuits.
The delay in commutation in electrical circuits occurs due to the base cause of electromotive force (EMF) induced. This EMF is induced primarily due to two factors - self-inductance and mutual inductance.
1. Self-Inductance:
Self-inductance is the property of an electrical circuit or component to oppose any change in the current flowing through it. When a current flows through a coil or an inductive component, it creates a magnetic field around it. This magnetic field induces an EMF in the same coil or component, which opposes the change in the current. This self-induced EMF is known as back EMF.
During commutation, when the current in a DC machine is reversed, the back EMF due to self-inductance opposes this change. This back EMF tends to maintain the current in the same direction, which hinders the reversal of current. This opposition from self-inductance leads to a delay in commutation.
2. Mutual Inductance:
Mutual inductance is the property of two inductive components or circuits to influence each other's magnetic fields. In electrical machines, mutual inductance occurs between the armature winding and the field winding. When the current in the armature winding is reversed, it induces an EMF in the field winding due to mutual inductance.
Similar to self-inductance, this induced EMF opposes the change in current direction, causing a delay in commutation. The mutual inductance between the armature and field windings plays a significant role in the delay of commutation.
Conclusion:
In conclusion, the delay in commutation occurs primarily due to the base cause of EMF induced. This EMF is induced due to both self-inductance and mutual inductance. Self-inductance creates a back EMF that opposes the reversal of current, while mutual inductance induces an opposing EMF in the field winding. These factors contribute to the delay in commutation, which is a crucial aspect of DC machines and electrical circuits.
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