USB manipulation using mobile phone
Don't use USB.  Anything you do with USB will require a processor of some kind, and complicated software on the phone - if it can be done at all 

Do it the easy way.

Your phone certainly has an alarm clock.

Plug an earphone plug into the phone, and use an analog circuit on the earphone output to turn on the motor.

Something like this circuit:



Leave off U2, the microphone, and the associated parts.  

Connect the earphone output of your phone to C6 and ground.

When the alarm clock on the phone rings, the alarm tone will activate the circuit and turn on the motor.  A second alarm tone will turn the motor off.

You'll probably have to try out various alarm tones to find one that triggers reliably.  You may also have to try it with different volume settings.



There are simpler circuits.  That's one I found by searching for "sound activated switch."

You'll probably want to use a relay to switch the motor.

You can leave out