NDLI: Stator Temperature Estimation of Direct-Torque-Controlled Induction Machines via Active Flux or Torque Injection

Content Provider	IEEE Xplore Digital Library
Author	Lijun He Siwei Cheng Yi Du Harley, R.G. Habetler, T.G.
Copyright Year	1986
Abstract	This paper proposes two thermal monitoring methods for induction machines with direct torque control (DTC). The stator resistance Rs is used as a direct indicator of average winding temperature and is estimated via a dc current offset in the stator winding. In a DTC drive system, the major challenge is how to excite the dc current offset via the only existing flux and torque control loops. The quantitative relationship between the desired dc current offset and the corresponding changes in flux linkage and torque is derived, and this shows that the dc current offset can be achieved either by superimposing flux linkage bias command [ ΔΨ_sα,ref ΔΨ _sβ,ref ] in the flux control loop (method 1) or torque ripple command ΔT_em,ref in the torque control loop (method 2), both shown in Fig. 1. Simulation results confirm the analytical analysis of the two proposed methods; while the experimental data prove that both methods achieve accurate temperature estimation under various operating conditions. The proposed simple and efficient signal-injection-based temperature estimation technique is particularly advantageous since it eliminates the need for embedded temperature sensors, requires no hardware change to conventional DTC drive systems, and has a minimal impact on the induction machine's normal operation.
Sponsorship	IEEE Power Electronics Society
Starting Page	888
Ending Page	899
Page Count	12
File Size	5187944
File Format	PDF
ISSN	08858993
Volume Number	30
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stator windings Couplings Torque Rotors Estimation Resistance temperature estimation Direct torque control (DTC) induction machines (IM) signal injection stator resistance estimation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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