low limiting control 中文意思是什麼
low limiting control
解釋
低頻疲勞試驗機-
This paper mainly focuses on the noise limiting by means of the direct sequence spread spectrum ( dsss ) and the analysis of the transmission performance of the plc and some digital modulation technology. the contents of the paper is as follows : 1 ) the technical feasibility is proved after simulating noise limiting principle of dsss by means of systemview, the simulation software ; 2 ) a kind of band pass filter ( bpf ) is realized according to the requirement of filter and the principle of butterworth approximation, which satisfies the index of performance of dsss. 3 ) the low voltage plc system includes the sc1128, the specific modulation / demodulation ic, the bpf filter and other circuit components, furthermore, the control function of system is realized by means of the personal computer and the microcontroller
本課題在對低壓電力線的傳輸特性和數字調制技術進行分析的基礎上，將通信理論中的直接序列擴頻技術（ dsss ）用於解決低壓電力線通信的干擾問題，主要研究內容如下： （ 1 ）用通信模擬軟體systemview對dsss技術的通信和抗干擾原理進行模擬分析，分別對時域和頻域下採用dsss技術前後接收信號的頻譜進行分析，驗證dsss技術在本系統中的可行性； （ 2 ）由dsss技術對濾波系統的要求，根據濾波理論分析了巴特沃思型濾波器的逼近原理並設計了合適的濾波電路； （ 3 ）用調制解調晶元sc1128和自行設計的濾波器加之輔助外圍電路，構造出低壓電力線載波通信系統，並採用atmel公司的單片機設計了接收和發射電路的微控制器； （ 4 ）分別對採取抗干擾措施前後輸入和輸出信號進行對比實驗，並對結果進行分析，驗證了dsss技術對干擾信號的抑制作用。 -
Abstract : the system composed of intelligent control modules for three - phase induction motors is introduced in this paper. this module can conduct starting, reverse braking, and reverse conrtol with current limiting resistance. besides, it can also detect low voltage, overload, and open circuit of 1 or 2 phases, and do protection according to the detection. it especially fits to the controlling of motors which often do starting, braking and reversing
文摘:介紹了一種智能三相電機控制模塊組成的系統，能在串電阻（電抗）起動、反接制動和換向控制的基礎上進行欠壓檢測、過載檢測、斷相檢測及電機故障保護.尤其適用於起動、制動和換向控制頻繁的電機控制場合 -
With the development of the electronic technology, the higher requirements of power supply are raised including high efficiency, high power density, low emi and rapid dynamic response. a hysteresis - band instantaneous current control pwm technique is popularly used because of its simplicity of implementation, fast current control response, and inherent peak current limiting capability
隨著電子技術的發展，用電設備對電源要求不斷提高，開關電源正向著效率高、功率密度大、可靠性高、電磁干擾低、無噪聲、維護方便的方向發展。 -
It provides steady lifting with low noise, and is equipped with lifting brackets, anti - fall supporting protection, stopping protection against wire fracture, limiting device for maximum load, control device for maximum lifting height and fixing device for the turning angle of the bracket arm
升降平穩、噪音低，並設有舉升托架、防跌落支承保險、鋼索斷裂制動保險；最大負荷限定裝置和托臂回轉角度鎖定裝置。 -
Solid states fault current limiting ( ssfcl ) technology is a new fault current limiting technology. the faculty in zhejiang university have provided a novel bridge type solid state short circuit fault current limiter. it has many advantages : ( 1 ) the topologies is simple and it ' s easy to realize ; ( 2 ) the control and application mode is flexible ; ( 3 ) it has low wastage
固態限流技術（ ssfcl ）是一種新型限流技術，近年來，浙江大學電氣學院有關研究人員提出了一種全新的固態短路限流技術，新型固態限流器具有結構簡單、應用靈活、限流性能好、損耗小等特點。
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