"When encouraging students to find your subject matter interesting, use cues to show students the appeal of the subject matter." A good resource to understand intrinsic and extrinsic motivation.
"Larry Ferlazzo discusses practical classroom strategies to reinforce four qualities that have been identified as critical to helping students motivate themselves: autonomy, competence, relatedness, and relevance." These are strategies you can incorporate now into your classroom.
"So I have been trying to wean myself from the practice of using grades to motivate student learning." What not to do to motivate students.
These ideas don't really seem to be based on latest learning research.