If you have an old DC motor and are adding an SCR drive, what should you do with the interpoles?

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When incorporating an SCR (Silicon Controlled Rectifier) drive into an old DC motor system, it is advisable to leave the interpoles alone. Interpoles are small coils placed between the main poles of a DC motor, used to improve the commutation process by generating a field that counteracts the armature reaction, thus reducing sparking at the brushes.

In the context of an SCR drive, the motor will operate with controlled voltage and current, making it less susceptible to issues related to armature reaction that interpoles address. Since SCR drives are designed to provide smooth control and modify the motor's performance without drastically affecting the commutation behavior, the existing interpoles can remain as they are. They will not hinder the functionality of the SCR drive, nor will they need to be altered or removed, as their role in aiding commutation becomes less critical with the enhanced control of the SCR system.

Ultimately, leaving the interpoles intact allows for a straightforward integration of the SCR drive while ensuring that any residual benefits from the interpoles are still retained without introducing unnecessary complexity.

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