Smith has a 5-3-0 record with Dallas this season, along with a 2.27 goals-against average and a .903 save percentage. The team said the move is for conditioning.
Lundqvist, who appeared in his fifth NHL game Thursday night against the New York Rangers, has scored eight goals in 25 games for Iowa this season.
Ellis has a 7-7-0 record for Iowa this season, with a 3.85 goals-against average and a .871 save percentage. He played his only NHL game with Dallas in a 4-3 win against Los Angeles in February 2004.