The Clean Motors from HaydonKerk Motion Solutions (Waterbury, CT) are designed to limit contaminants and outgassing in vacuum environments. The motors operate in vacuum down to 10-9 Torr.
The motors are constructed of non-volatile materials, cleaned using ultrasonic equipment, and vacuum-baked at high temperature to extract contaminants. The motors have stainless steel bearings, Teflon wires, and high-temperature windings.
For more info, contact http://info.hotims.com/22908-306