Saints finished as runners-up in the Premiership last season and have strengthened their squad considerably this summer with the arrival of North as well as fellow British & Irish Lion Alex Corbisiero.
And North revealed that the chance to hunt silverware on the domestic stage was key in his move from the Scarlets to Franklin's Gardens.
"I haven't had a chance to win much with the Scarlets. That was one of the reasons I was keen to come to Northampton," said North.
"They have been in the hunt for the Premiership for a few years now and they have been in Europe.
"I am really happy to be here and I have come here to perform. The Premiership is seen in Wales as a forwards game. With Alex King coming in (as backs coach) we have a great chance to play some attacking rugby. We have a great back three here."