There are two reasons for this
1. Because it is rotating - It will have friction and windage loses. Transformer has no moving parts
2. Because there is an air gap between stator and rotor - This increases the mmf and magnetizing current to push the magnetic flux overcoming the air gap reluctance. The additional mmf needs to be supplied from the input supply
Ansys customers with active commercial software licenses can access the
customer portal and submit support questions. You will need your active account number to register.