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The 19‐electron VCoSb compounds are actually composites of an off‐stoichiometric half‐Heusler phase and impurities. Here the compositional adjustment is systematically studied in V1−xCoSb to obtain single‐phase V0.955CoSb. Hall measurements suggest that such a V vacancy, as well as Ti doping, can optimize the carrier concentration, which decreases from ≈11.3 × 1021 cm−3 for VCoSb to ≈6.3 × 1021 cm...
Se‐doped Mg3.2Sb1.5Bi0.5‐based thermoelectric materials are revisited in this study. An increased ZT value ≈1.4 at about 723 K is obtained in Mg3.2Sb1.5Bi0.49Se0.01 with optimized carrier concentration ≈1.9 × 1019 cm−3. Based on this composition, Co and Mn are incorporated for the manipulation of the carrier scattering mechanism, which are beneficial to the dramatically enhanced electrical conductivity...
The inherent highly nonlinearity of switched reluctance motor not only makes it difficult to eliminate torque ripple with conventional average torque control techniques, but also restricts its application in the high-performance servo systems. A novel control strategy combing direct instantaneous torque control with the torque sharing function control is proposed in this paper. In order to track the...
In this paper, a transient characteristic measuring system for switched reluctance motor (SRM) based on virtual instrument technology and the multi-function data acquisition card PCI-6250 is developed. Firstly, the system hardware is built up. The transient data including phase current and voltage, rotor angle position are collected by the data acquisition card, and transmitted to a computer by PCIBUS...
Direct instantaneous torque control (DITC) method of the switched reluctance motor (SRM) is studied in this paper. Modeling and simulations of the DITC system have been conducted with MATLAB/Simulink. The simulation results accurately reflect the actual operation states of SRM. It is verified that DITC method can effectively reduce the torque ripple of SRM.
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