Excitation (magnetic) Field coils are found in a vast array of electrical machines and so any attempt to categorise them in a readable manner is likely to exclude some obscure examples.
تستخدم الفضة في حالات نادرة.  شدة المجال المغناطيسي Field coils are found in a vast array of electrical machines and so any attempt to categorise them in a readable manner is likely to exclude some obscure examples.