Assertion: motor's rotor | /r/HasProperty | constructed
Facets:
value: from electromagnets
type: OTHER
value: from either permanent magnets
type: OTHER
value: from copper or aluminium bars
type: OTHER
Source sentences:
text: The most popular AC motors use "squirrel cage" rotors which are constructed from copper or aluminium bars fixed between conducting end rings which provide the short circuit path for the currents induced in the bars.
text: The synchronous motor is similar to the induction motor in that it is a polyphase machine in which the stator produces a rotating field, however the rotor is constructed from either permanent magnets or electromagnets energised by direct current supplied through slip rings.