In-Vacuum Stepper Motors And Cryo Stepper Motors; Heating In Vacuum Environment - phytron LSS 26 Manual

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In-Vacuum Stepper Motors and Cryo Stepper Motors

Phytron VSS stepper motors for in-vacuum and Cryo applications are precision drives with
protection class IP20. According to the vacuum class, the motors are designed for different
temperature, pressure and radiation ranges, see section 10.1. Cryo stepper motors are
ultra high vacuum stepper motors for operation e.g. in liquid nitrogen or liquid helium.
In-vacuum and Cryo stepper motors are manufactured, cleaned, tested and packed with
great care and accuracy. A 3-stage package protects the stepper motor against contami-
nation, moisture and mechanical damage.
On opening the packaging, several precautions must be observed (section 3) to maintain
the defined stepper motor's specifications and functionality.
Fig. 1 : In-vacuum or Cryo stepper motor – rear view
The two most important rules for handling in-vacuum and Cryo step-
i
per motors:
- Do not touch the stepper motor with bare hands!
- Take care that no particles or moisture can get inside the motor
through the outgassing holes.

2.1 Heating in Vacuum Environment

Normally, the heat generated by a stepper motor in a vacuum is largely dissipated by con-
duction through the mounting surface; heat dissipation by convection and radiation are
negligible. To avoid overheating the motor, the maximum specified temperatures (sec-
tion10.1 ) must be taken into account when determining duty cycles for setting the peak,
run and stop (holding) current values.
MA 1203-A010 EN
Outgassing hole
Engraved
serial number
9
phytron