I have a hampton bay ceiling fan with a remote.all three fan speeds are slow and there is a humming coming from the motor. The light fixture seems to be fine. Is the fan motor bad?

Does the fan have pull chains?

I concur. Is it a remote fan? If not, bad capacitor. If so, bad receiver.

Ceiling fan capactors - troubleshooting and resources - Ceiling Fans N More (http://www.ceiling-fans-n-more.com/ceiling-fan-capacitors.php)