A brushless servo motor requires no point of electrical or mechanical contact between the source voltage and the rotating component of the motor. Because brushless servo motors have no point of electromechanical contact they are virtually maintenance free, and motor life is limited only by the life of the rotor bearings. Additionally, because there is very low or no electromagnetic interference (EMI) or radio frequency interference (RFI), brushless servo motors can be utilized in sensitive or explosive environments. Most are available with or without feedback devices. With sizes ranging from less than 1" diameter to over 4" diameter and speeds as high as 25,000 rpm, brushless servo motors are a good selection in many demanding, high speed applications.