AC Induction Motors (ACIM) have windings on the rotor but the rotor does not draw current from a physical connection. The rotor current is induced by a rotating stator field. Surrounded by the stator field, the induced rotor current results in a mechanical force moving the rotor (Faraday's law of induction)
An ACIM is classified as an asynchronous motor because the rotor's motion may not keep up with the stator field's rotation. The difference between the rotor and the stator field is called "slip"