http://www.usa.canon.com/cusa/semiconductor/products/dcmicro_motors/brushless_motors?pageKeyCode=writeReviewPage
Brushless Motors
Overview
Canon's brushless motors are compact in size
and provide high output power. Two types are offered;
an outer rotor type with high rotational stability and
an inner rotor type with quick response. Inner rotor types
can be equipped with reduction gears and encoders. Various
custom options can be incorporated to fit your applications.