By the analysis of Euler\'s three earlier papers on the calculus of variations and that of his mistake on the fundamental principle,and the comparison with Euler\'s and his pioneers\' solutions,the refinement of Euler\'s two core achievements,i.e., fundamental equation and isoperimetric rule,is explained.

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First, the paper reviews the development and research of AC transfer speed system, introduces the different control strategy of transfer speed system for asynchronous motor, and discusses the basic principle of vector control system for asynchronous motor in detail,including the mathematics model and coordinate transformation of asynchronous motor, the fundamental equation of vector control, the estimation method of rotor flux, the system structure of vector control etc. Then, the paper lays stress on the fundamental principle, control algorithm and realization method in TMS320LF2407 of space vector pulse width modulation technology.

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Furthermore, guaranteeing the participance of the parties and the public, strengthening the dependency of the parties of the jurisdiction, and securing the realization of the principle of publicity, by the way of substantiation the process of trial. As a fundamental principle in trial, the principle of concentration definitely influences the hearing structure and the instance structure greatly, while substantiating the process of trial.

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the fundamental principle of sensible environmentalism：理智環(huán)境保護(hù)論的基本原理

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fundamental matrix：某礎(chǔ)矩陣

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信仰自由-The freedom to worship God in one's own way | 理論精透-Is the most fundamental principle one may reach. | 33 凡各教徒-Apostles of the world!