The armature of a DC motor is laminated to reduce
A. hysteresis loss.
B. eddy current loss.
C. copper loss.
D. friction and windage loss.
Show Answer
Answer: B
Share your understanding of this question with the correct explanation.
The armature of a DC motor is laminated to reduce eddy current loss.
Eddy currents are circulating currents that are induced within the conducting material, in this case, the armature core, when it is exposed to changing magnetic fields. These eddy currents result in power loss through resistive heating, known as eddy current loss.
By laminating the armature core, it is divided into thin layers or laminations, with insulation between them. These laminations help to minimize the circulation of eddy currents by reducing the continuous paths for current flow. The thin layers with insulation between them effectively break up the conductive loops that would otherwise allow significant eddy currents to form.
Reducing the eddy current loss through lamination improves the overall efficiency of the DC motor by minimizing the power dissipated as heat in the armature core. This allows more of the electrical input power to be converted into mechanical output power.
Therefore, the correct answer is B: eddy current loss. The armature of a DC motor is laminated to reduce the eddy current loss and improve the motor’s overall efficiency.