phytron
MA 1313-A001 EN
23
7 Temperature Measuring (Motors with Temperature Sensor)
In vacuum environments, there is the danger of overheating the stepper motor because of
the lack of heat dissipation by ambient air. To avoid damages, use a motor with built-in
temperature sensor.
Phytron space stepper motors are mounted with thermocouple type K. Other options such
as Pt100 and Pt1000 or customised solutions are available.
The insulated temperature sensor is integrated in the motor windings. The response time
is very short, compared to temperature sensors mounted outside the motor housing. The
temperature is measured all the time, even if only one motor phase is powered at any one
time.
In case of cold redundant windings, both winding systems are fitted with a temperature
sensor.
7.1 Type K Thermal Element
With space stepper motors, Type K (NiCr-Ni) thermal elements in the temperature range
from
–270 to +1370 °C, accuracy class 1, are used.
Type K is a metal thermal element with nickel-based alloy conductors. Temperature rang-
es, accuracy and characteristics of thermal elements for industrial use are defined in the
IEC 584 standard (temperature measuring with thermal elements).
The accuracy of the applied thermal elements class 1 is:
–40 to +300 °C +/– 0.004 x t or +/– 1.5 °C
t = actual temperature, the higher value is valid.
i
CAUTION
– Possible damage!
Type K Thermal Element:
- The thermal element's leads are the same colour and insulated
with Kap
ton™ foil.
-
Check for correct polarity!
The minus pole is magnetic.
- Only connectors specified for K elements should be wired.
