Research on Permanent Magnet Constant Voltage Device for Vehicle
Firstly, the improved quadratic regression orthogonal design method is proposed. Secondly, the indoor physical experiment is carried out on the main affecting factors for the permanent magnet constant voltage device for vehicle application, and meanwhile, the corresponding output voltage and current mathematical model is established by means of the statistical analysis, mathematical model establishment. Finally, the influence mechanism of the different speed and frequency on the output voltage and current is analyzed. This research can provide an important basis for study of the permanent magnet constant voltage device.
Operating control of efficiently generating of induction motor for driving hybrid electric vehicle (HEV)
In this paper the principle of induction motor for driving HEV is analyzed when running in state of generator. Based on induction motor's equivalent circuit, it is concluded both the slip range when feeding back to storage battery and the optimum slip at peak generating efficiency. Generator can operate at peak efficiency in terms of the optimum slip controlling excitation current and frequency of induction motor. Optimum slip vector control system of induction motor for driving HEV is designed. The experiment results are satisfying. Analyzing and testing in this paper will provide theoretic and experimental support for optimum control of HEV.
Novel method for the determination of the methoxyl content in lignin by headspace gas chromatography.
The paper reports on a headspace gas chromatographic (HS-GC) method for the determination of methoxyl in lignin. The method involves the quantitive cleavage of methoxyl with hydroiodic acid (HI) to form methyl iodide in a closed headspace sample vial at 130 °C for 30 min. After HI has been added, the sample is neutralized by injecting a sodium hydroxide solution; the methyl iodide in the vial was determined by HS-GC using a flame ionization detector. The results showed that the method has an excellent measurement precision (RSD < 0.69%) and accuracy (RSD < 3.5%) for the quantification of methoxyl content in lignin. The present method is simple and accurate and can be used for the efficient determination of methoxy1 content in lignin and related materials.