Observing the Permanent-Magnet Temperature of Synchronous Motors Based on Electrical Fundamental Wave Model Quantities

Estimating the magnet temperature of permanent-magnet synchronous motors on a model basis is the key for both the highest device utilization and preventing irreversible demagnetization. Using an exact flux linkage observer in the fundamental wave domain is an elegant way to indirectly retrieve the m...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2017-05, Vol.64 (5), p.3921-3929
Main Authors: Wallscheid, Oliver, Specht, Andreas, Bocker, Joachim
Format: Article
Language:English
Subjects:
Air gaps
Magnetic domains
Magnetomechanical effects
Observers
Permanent magnet motors
Permanent magnets
permanent-magnet (PM) machines
Saturation magnetization
Signal injection
state estimation
Synchronous motors
temperature
Temperature measurement
Temperature sensors
Thermal expansion
thermal stresses
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Summary:Estimating the magnet temperature of permanent-magnet synchronous motors on a model basis is the key for both the highest device utilization and preventing irreversible demagnetization. Using an exact flux linkage observer in the fundamental wave domain is an elegant way to indirectly retrieve the magnet temperature without requiring any additional sensors or signal injection. This contribution addresses several important issues for the real-world applicability of a permanent magnet temperature observer: thermal expansion affecting the radial air gap thickness, operation at low speeds or even standstill, and estimating the fundamental content of the motor's terminal voltage within one switching cycle. The proposed observer is comprehensively validated in the entire electrical and thermal operation range achieving a satisfying worst case error less than 10 K.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2017.2652363