July 2013 6.11 Monitoring functions 917
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
R
th1
R
th2
KTY
C
th1
C
th2
P
T
th1
T
th2
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