What is meant by reactance voltage?

  • An armature coil has certain self inductance.
  • When coil undergoes commutation, there is change in current (di) in that coil and the commutation takes certain time(dt).
  • Thus there is self-induced emf in a coil undergoing commutation given by L(di/dt).
  • This EMF induced in the coil undergoing commutation is called reactance voltage.