Very small and extremely fast electric motor - 90,000 rpm

Very small DC motor from a toy or servo.

2 volts 50,000 rpm

4 volt 90,000 rpm

Hi. You can buy this micro electric motor 66000 Rpm at 3,7volt. When the volts is higher the rpm rises until the motor burn. 6 volt gives you about 99000 rpm. See this Link http://www.ebay.com/itm/DC-3-7V-66000RPM-4-x-12mm-Wired-Micro-Coreless-Motor-for-Helicopter-Model-Toy-/291157828040?pt=LH_DefaultDomain_3&hash=item43ca5be1c8