Whether it is a Space application or special process deep inside a semiconductor machine, motors and motion systems need unique features to perform in these environments.
Typical ranges down to 1E-7 are considered light vacuum, and lower levels down to 1E-9 or smaller are considered deep vacuum.
In some cases, major concerns are outgassing of materials, in other cases vacuum environments might expose issues with material degradation.
There is no convection cooling in vacuum environments. Therefore, most motor and motion systems need proper sizing and ratings to be vacuum compatible.
Sierramotion starts with material selection first. We relate the environmental requirements to motor specific materials.
The conditions change whether we are trying to protect the motor from the environment or if we are trying to protect the environment from the motor.
Engineer the system first then make the product. Let Sierramotion help you define, design and build the solution.
Can magnets operate in space?
It depends on the type of magnet, some magnets can survive, others will disintegrate
How do I calculate the motor rating in vacuum?
Smaller motors require higher derating than larger motors. Generally motors derate to 75% of their typical ratings.
If an enclosure is used how do I ensure it is hermetic?
A Helium leak test is generally used to verify laser welded enclosures are hermetic. Everything leaks, the leak rate is what is critical for hermeticity. Several standards are used for leak testing. Sierra Motion will guide you through the process and select the correct test.
What does it cost to have a custom motor designed for vacuum environments?
Non-recurring charges can be in the $5k-25k range depending on size and features. Expect to pay 25%-50% more than a traditional non-vacuum solution.
How much are motors derated when enclosed for deep vacuum?
Deep vacuum typically requires full hermetic enclosures around the motor parts. The results in a larger magnetic airgap and can reduce performance by 20%. This is independent of any thermal derating due to lack of convection in vacuum.