Why does my fan motor hum?

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It could be anything from lose motor base bolt to an imbalance of the blades themselves. Check the blade screws first.

Here is a page which has an answer to this question, "Why does my ceiling fan make a humming noise (http://www.ceiling-fans-n-more.com/ceiling-fan-general-troubleshooting-and-FAQ.php#6)?" One of the questions answered on that page is regarding humming noises. There are a few things you can check on your ceiling fan to determine where the humming noise is coming from. Going through blade balancing checks may also be a good idea.