Purpose of a interpole
The main purpose of an interpole in an electrical machine, such as a DC motor, is to improve its performance and efficiency. An interpole is a small electromagnet placed in between the main poles of the machine. When the machine is in operation, the interpole produces a magnetic field that helps to reduce the armature reaction.
Armature reaction is a phenomenon that occurs in DC motors and generators when the current flowing through the armature produces a magnetic field that interacts with the main magnetic field of the machine. This can cause distortion of the magnetic field and produce a variety of negative effects on the machine's performance, such as reduced efficiency, increased heat generation, and even mechanical stress.
The interpole produces a magnetic field that is opposite in direction to the armature field, which helps to neutralize the armature reaction and maintain a more stable magnetic field. This results in smoother operation, increased efficiency, and improved performance of the DC motor or generator.
In summary, an interpole serves the important purpose of reducing armature reaction and improving the performance and efficiency of DC motors and generators.