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Insulated gate bipolar transistor (IGBT) junction temperature monitoring is crucial for IGBT reliability assessment and health management. However, most traditional methods are involved with calibrating current, which increases the complexity of the practical application. In this article, an IGBT junction temperature monitoring method current calibration free based on the narrow pulse injection is proposed. A narrow pulse is injected in the expected current, which allows temperature monitoring at a fixed current value, thus avoiding the current calibration. Besides, the voltage overshoot of the narrow pulse has a linear relationship with IGBT junction temperature. The dependence of narrow pulse voltage overshoot on junction temperature is analyzed in detail. The setup of narrow pulse injection is introduced. The experiments are conducted, and the feasibility of the proposed method is verified. Moreover, considering a typical permanent magnet synchronous motor as the load, the effect of a narrow pulse on load is analyzed. The analysis results indicate that the influence of narrow pulse injection is tiny for a motor load. The IGBT junction temperature monitoring method based on the narrow pulse injection has the advantages of no current calibration and high monitoring resolution and flexibility.

Permanent magnet assisted reluctance (PMAREL) machine possesses a promising application prospect in the aircraft starter/generator (S/G) system. This article presents a high-performance generation control strategy for a dual-three-phase (DTP) PMAREL S/G system. By studying the DTP machine models in the synchronous frame, a generation control framework suited for the DTP PMAREL machine is provided, which consists of a current-control inner loop and a voltage-control outer loop. For the current control, the negative effects of the magnetic saturation on the conventional current-control method are studied. To eliminate the negative effects of the magnetic saturation and to achieve good high-speed control performance, an improved flux-loop-based internal-model-control current-control method is proposed. The performance and robustness of the proposed method are analyzed. For the voltage control, the load power feedforward technique is adopted to improve the dynamic performance of the generation control. Based on a prototype of DTP PMAREL S/G system, experiments are conducted and the results verify the correctness of the analysis and the effectiveness of the proposed method.