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3.1. Motor selection
3.1.1.
Altitude derating
From 0 to 1000 m : no derating
1000 to 4000 m:
1000 to 4000 m:
3.1.2.
Temperature derating
3.1.2.1.
The maximal temperature for natural cooling is 40°C. But, it is possible to increase a
little bit the ambient temperature above 40°C, with a torque reduction. The following
formula gives an indicative about the torque derating at low speed. But in any case
refer to PARKER technical department to know the exact values
At low speed the torque derating is given by the following formula for an ambient
temperature > 40°C.
Torque
_
derating
At high speed, the calculation is more complex, and the derating is
much more important.
Please refer to PARKER to know the precise data of Torque derating
according to ambient temperature at high speed for a specific motor.
Illustration:
Only for example given for the NK620EAR :
105
Torque Derating vs. ambient temperature
100
95
90
85
80
75
25
30
3. TECHNICAL DATA
torque derating of 5% for each step of 1000 m for water cooled
torque derating of 10% for each step of 1000 m for air cooled
Natural cooled motor
(
145
C
[%]
100
*
35
40
12 - PVD 3664_GB_NK-November 2016.Docx
Ambient
_
temperatur
e
105
C
Torque derating at low speed [%]
Torque derating at high speed [%]
45
50
C
)
Ambient temperature [°C]
55
60
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