電勢梯度 的英文怎麼說
中文拼音 [diànshìtīdù]
電勢梯度
英文
electric potential gradient-
Secondly, the effects of the crest width of the back - emf waveform to the torque ripple in the 120 ? conduction mode are analyzed, among which the effects of the advance commutation angle to the torque ripple are quantificationally analyzed for the bldcm drives whose back - emf waveform crest width is less than 120 ?,
其次分析了120導通方式下反電動勢平頂寬度對轉矩脈動的影響,對于平頂寬度小於120電角的非理想梯形波反電動勢,定量分析了換相超前角對換相轉矩脈動的影響。For the bldcm which has a general crest width of the back - emf waveform, two kinds of torque ripple conditions when drived by sine - wave current as well as by square - wave current are deduced based on the mathematical models. in addition, a comparison is carried out between these two conditions, which indicates that sinusoidal current driving is more favorable to minimizing the torque ripple when the crest width of the back - emf waveform is less than a certain value
闡述了抑制齒槽轉矩措施對反電動勢波形的影響,利用無刷直流電機的數學模型推導並比較了任意平頂寬度梯形波反電動勢在正弦波和矩形波兩種電流驅動下的電磁轉矩脈動情況,得出在梯形波平頂寬度減小到一定數值后採用正弦電流驅動更有利於減小電磁轉矩脈動。An understanding of electrical emission of concrete may lead to hi practical application such as nondestructive testing of concrete. ( s ) according to nonequilibrium thermodynamics, a mathematical model on the relationship between strain gradient and electric potential gradient is presented
( 5 )依據非平衡態熱力學建立了混凝土中應變梯度和電勢梯度、應變梯此漢理卜人學附士學位論文度和電場強度等力電關系的數學模型。This paper fully analyzed and discussed the progressive process of hydropower plant operation mode, the development process and trend of cscs ; simply introduced the regulations and demands of no operator on duty in hydropower plant ; analyzed all kinds of demand of cscs to implement no operator on duty ; in allusion to the running actualities of the operation management mode, analyzed the difficulties to implement no operator on duty in gehp ; put forward the reforming items for devices and equipment maintenance and demands of reforming of cscs to implement no operator on duty in gehp ; advanced a new concept and idea : " computer operator " and " computer operator director " ; and set up a new operation management mode - no operator on duty in gehp that is appropriate to three gorges cascade dispatch center ( tgcdc )
本文全面分析論述了水電廠運行值班方式進步的過程和計算機監控系統的發展及其趨勢;簡要介紹了水電廠無人值班的規定和要求;分析了實行無人值班對計算機監控系統的各項要求;針對運行值班方式的現狀,分析了二江電廠實現無人值班的難點;提出了實現無人值班需配套進行的設備改造項目和適應無人值班的設備維護管理模式;重點分析了二江電廠實現無人值班對計算機監控系統改造的要求,提出了「電腦值班員」和「電腦值長」的概念和思路。建立了二江電廠在三峽梯調聯合調度模式下的無人值班管理新模式。The non - ideal bemf waveform of bldcm is often caused by two facts. one is that the platform width of bemf waveform is less than 120 ; the other is the cogging harmonics existed in the bemf waveform
非理想反電動勢波形的無刷直流電機有兩種情況,一種是反電動勢的梯形波的平頂寬度小於120 ;一種是由於磁場分佈受齒槽的影響,反電動勢存在齒諧波,使其波形發生畸變。To guarantee the validity and speediness insimulation, the back - emf is generated using piecewise linear curves. in the double loop of control system, a pi controller is adopted in the speed loop and a hysteresis current controller is adopted in the current loop
為保證模擬快速性和有效性,模型採用分段線性法生成梯形波反電動勢,系統採用雙閉環控制:速度環採用pi控制,電流環採用滯環電流控制。Possible geometrical structures and relative stability of semiconductor microclusters ganpn ( n = 1 - 5 ) are studied by using density functional calculations with generalized gradient approximation ( b3lyp ). for the most stable isomers of ganpn ( n = 1 - 4 ) clusters, the electronic structures, vibrational properties, dipole moments, polarizability and ionization potential are analyzed using hf, mp2, cisd and b3lyp methods with different basis sets
用梯度修正的密度泛函方法( b3lyp 6 - 31g )優化了ga _ np _ n ( n = 1 - 5 )團簇的可能幾何構型,計算了各穩定構型的的振動光譜,並用不同方法( hf 、 mp2 、 cisd等)研究了各穩定構型的電子結構、電離勢、偶極矩和極化率等性質。分享友人