976 HEIDENHAIN Technical Manual MANUALplus 620
Second-order temperature model of the motor
P: Heat output of the three phases
KTY: KTY temperature sensor in the winding
C
th1
: Thermal capacity of the winding
C
th2
: Thermal capacity of the housing
R
th1
: Thermal resistance winding/housing
R
th2
: Thermal resistance housing/coolant
T
th1
= R
th1
· C
th1
T
th2
= R
th2
· C
th2
Compatibility Old motor tables are also usable in newer software versions. If the columns/
parameters in the temperature models are missing, however, it is of course
impossible to calculate a second-order temperature model.
In such a case the entries F-DC, T-DC, F-AC, T-AC are used for a first-order
temperature model. If this model, too, has no entries (entries "0"), the default
values of the above temperature models apply.
R
th1
R
th2
KTY
C
th1
C
th2
P
T
th1
T
th2
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