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Extracting structure functions of power devices in induction motor drives

Aliyu, Attahir Murtala; Castellazzi, Alberto


Attahir Murtala Aliyu

Alberto Castellazzi


This paper proposes the extraction of structure function from power devices on-board induction motor drives. It puts forward the issues and methodology related to on-board measurement of the cooling curve and derivation of the structure function during idle times in induction motor drives for maintenance purposes. The structure function uses the thermal resistances and capacitances in the Cauer form to identify changes in the device structure. The advantage of the structure function is that it does not only reveal the value but also the location of the thermal resistance and capacitance in the heat flow path. The novelty in this work is the methodology used to achieve the measurement of the cooling curve and the derivation of the structure function despite issues related to freewheeling current due to energy stored as a result of motor inductance.


Aliyu, A. M., & Castellazzi, A. (2016). Extracting structure functions of power devices in induction motor drives.

Conference Name 22nd International Workshop on Thermal Investigations of ICs and Systems (THERMINIC 2016)
End Date Sep 23, 2016
Acceptance Date Jul 15, 2016
Publication Date Sep 22, 2016
Deposit Date Feb 8, 2017
Publicly Available Date Feb 8, 2017
Peer Reviewed Peer Reviewed
Keywords Temperature measurement, Current measurement, Heating, Voltage measurement, Temperature sensors, Thermal resistance, Switches
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