The best way to get your team to provide you with a rating is just being a good sponsor. Do everything you should be doing and always make yourself available for your team whenever they need it. Provide you team with timely updates and make sure your communication with them is consistent.
Never ask for someone on your team to rate you. You're more likely to get a negative rating by pestering your team members to give you a rating.
Positive ratings are not given, they are earned.
