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Armature reaction in a D.C. motor is increased.
- a)When the armature current increase
- b)When the armature current decrease
- c)When the field current increase
- d)By interpoles
Correct answer is option 'A'. Can you explain this answer?
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Armature reaction in a D.C. motor is increased.a)When the armature cu...
In the armature, an electromotive force is created by the relative motion of the armature and the field. When the machine is used as a motor, this EMF opposes the armature current, and the armature converts electrical power to mechanical power in the form of torque, and transfers it via the shaft. When the machine is used as a generator, the armature EMF drives the armature current, and the shaft's movement is converted to electrical power. In an induction generator, these distinctions are blurred, since the generated power is drawn from the stator, which would normally be considered the field.
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A growler is used to check the armature for shorts, opens and grounds.
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Armature reaction in a D.C. motor is increased.a)When the armature cu...
Armature Reaction in a D.C. Motor
Armature reaction in a DC motor is the effect of the magnetic field produced by the armature current on the main magnetic field of the motor. This interaction can cause various changes in the motor's performance.
Effect of Armature Current on Armature Reaction
- When the armature current increases, the magnetic field produced by the armature current also increases. This leads to a stronger armature reaction in the motor.
- The increased armature reaction can distort the main magnetic field, causing changes in the motor's speed, torque, and efficiency.
- The increased armature reaction can also lead to a phenomenon known as commutation sparking, which can damage the motor's commutator and brushes.
Other Factors Affecting Armature Reaction
- The field current in a DC motor can also affect armature reaction. However, in this case, the question specifically asked about the effect of armature current.
- Interpoles are additional poles placed between the main poles of a DC motor to counteract the effects of armature reaction. While interpoles can help reduce armature reaction, they were not the focus of this question.
In conclusion, the armature reaction in a DC motor is increased when the armature current increases. It is important to understand and manage armature reaction to ensure the efficient and safe operation of the motor.
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Armature reaction in a D.C. motor is increased.a)When the armature current increaseb)When the armature current decreasec)When the field current increased)By interpolesCorrect answer is option 'A'. Can you explain this answer?
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