Assertion: rotor's field | /r/CapableOf | alternate reverse polarity
Facets:
value: in synchronism
type: TEMPORAL
Source sentences:
text: A universal motor can operate well on AC because the current in both the field and the armature coils (and hence the resultant magnetic fields) will alternate (reverse polarity) in synchronism, and hence the resulting mechanical force will occur in a constant direction of rotation.