Iyakance na amfani da injin iska

Yawancin samfuran lantarki suna buƙatar rauni tare da murfin ƙarfe (an ƙirar waya don takaita) don ƙirƙirar injin shigowa {{0}
Misali, da yawa morlows, m motors, masu rotors, masu kawowa, m coils, masu juyawa, da sauransu {asar mitsi, da sauransu .}
A cikin masana'antar masana'anta, auduga yarn da firl yaro sau da yawa ana amfani da su sosai don iska da injunan talauci {{1}