Junction Temperature Control System to Increase the Lifetime of IGBT-Power-Modules in Synchronous Motor Drives Without Affecting Torque and Speed

Load changes of electrical machines driven by inverters cause temperature swings of the semiconductor devices in IGBT modules of the inverters. These temperature swings limit the numbers of cycles to failure of the IGBTs. This paper presents a temperature control system which is paralleled to the st...

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Bibliographic Details
Published in:IEEE open journal of power electronics 2020-01, Vol.1, p.1-1
Main Authors: Woelfle, Julian, Nitzsche, Maximilian, Ruthardt, Johannes, Roth-Stielow, Joerg
Format: Article
Language:English
Subjects:
Artificially increased losses
Clamps
discontinuous modulation
extra loss creation
IGBT lifetime
Insulated gate bipolar transistors
junction temperature control
Junctions
Modulation
paralleled temper-ature control system
paralleled temperature control system
reactive current
reduction of temperature swing
Switches
Temperature control
variable switching frequency
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Summary:Load changes of electrical machines driven by inverters cause temperature swings of the semiconductor devices in IGBT modules of the inverters. These temperature swings limit the numbers of cycles to failure of the IGBTs. This paper presents a temperature control system which is paralleled to the standard torque control system. It reduces the magnitude of temperature swings of the semiconductor devices caused by load changes of an interior permanent magnet synchronous machine. The principle method is, to increase the temperature of the semiconductor devices of the IGBT-modules by creating higher power losses during low load conditions of the machine without affecting torque and speed. This reduces the magnitude of the load induced temperature swings and increases lifetime at the cost of increased power losses. Three variables have been identified that influence the power losses in inverter modules without necessarily affecting the out-put power of the permanent synchronous machine. These varia-bles are switching frequency of the inverter, length of the clamp-ing area when a discontinuous modulation is applied and the reactive component of the inverter current. The influence of each variable which regards to the losses in the IGBT-power-modules is explained and the related control methodology is described.
ISSN:2644-1314
2644-1314
DOI:10.1109/OJPEL.2020.3014443