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Low Outgassing Stepper Motors for Cleanroom Applications

Vacuum-rated stepper motors are often a necessary requirement when working in a cleanroom environment. Similar to their use in the industrial and aerospace vacuum environments, you’ll need to consider outgassing contamination as a major challenge. Outgassing occurs when gasses and particles that are trapped inside paints, coatings, and greases, are released into the environment and introduce unwanted contaminants. Vacuum rated stepper motors must be designed using low-outgassing materials in order to minimize the outgassing problem, which makes it ideal for cleanroom environments too.

Vacuum compatible motors, such as our 211 Series (NEMA 11), 4118 Series (NEMA 17), and 5718 Series (NEMA 23) motors, manage outgassing through our proprietary motor assembly process designed specifically for vacuum motors. By using low-outgassing materials during the manufacturing process, our products also reduce the number of contaminants that are able to enter the system.

We’ve compared our vacuum compatible motors against major competitive devices in a positive flow chamber that measured outgassing levels. Our vacuum compatible motors repeatedly outperform the competition. Contact us for specific information.

The following motors are available as vacuum rated:

211 Series
NEMA 111.8° Step AngleUp to 16.9 oz-in (0.12 N-m) Holding Torque
4118 Series
NEMA 171.8° Step AngleUp to 124.6 oz-in (0.88 N-m) Holding Torque
5718 Series
NEMA 231.8° Step AngleUp to 294.5 oz-in (2.08 N-m) Holding Torque

Vacuum Applications

Vacuum Chambers

Vacuum rated motors are often used in vacuum chambers for testing and manufacturing purposes.

Space flight

Specifically designed to be used in satellites and space craft, applications for our vacuum rated motors range from communication antennas to vehicle controls. We are an AS9100C registered manufacturer, and each motor is manufactured to meet the strict aerospace guidelines.

Proprietary Motor Assembly Process

In order to create the cleanest motor on the market, we’ve created our own motor assembly process and put the results to the test—against a known competitor’s motor. To do so, we placed our motor into a positive flow chamber (N2 Gas flow 1mm/1min) and measured its outgassing levels over a 72 hour period at a temperature of 125°C. Then we took the following measurements:

  • Total Mass Loss Percentage (%TML)—The larger the percentage, the more contaminated the specimen.
  • Total Mass Loss (ug/motor)—This is the weight of the mass that was evaporated into the chamber from the specimen. The larger the number, the more contaminated the specimen.

The Result

Sample% Total Mass Loss (TML)Mass Loss (ug/motor)
Lin Engineering0.00829.000

The Lin Engineering vacuum rated motor lost far less mass than the competitor’s motor, proving the cleanliness of the system. Our cleaning process in 375% cleaner than the competition.