為了提高直接轉矩控制（DTC）系統定子磁鏈估計精度，降低電流、電壓測量的隨機誤差，提出了一種基于擴展卡爾曼濾波（EKF）實現異步電機轉子位置和速度估計的方法。擴展卡爾曼濾波器是建立在基于旋轉坐標系下由定子電流、電壓、轉子轉速和其它電機參量所構成的電機模型上，將定子電流、定子磁鏈、轉速和轉子角位置作為狀態變量，定子電壓為輸入變量，定子電流為輸出變量，通過對磁鏈和轉速的閉環控制提高定子磁鏈的估計精度，實現了異步電機的無速度傳感器直接轉矩控制策略，仿真結果驗證了該方法的可行性,提高了直接轉矩的控制性能。 Abstract: In order to improve the Direct Torque Control（DTC） system of stator flux estimation accuracy and reduce the current， voltage measurement of random error， a novel method to estimate the speed and rotor position of asynchronous motor based on Extended Kalman filter was introduced. EKF was based on d-p axis motor and other motor parameters （state vector: stator current， stator flux linkage， rotor angular speed and position； input: stator voltage； output: staror current). EKF was designed for stator flux and rotor speed estimation in close-loop control. It can improve the estimated accuracy of stator flux. It is possible to estimate the speed and rotor position and implement asynchronous motor drives without position and speed sensors. The simulation results show it is efficient and improves the control performance.
上傳時間： 2015-01-02
上傳用戶：qingdou
Abstract: Many modern industrial, medical, and commercial applications require temperature measurements in the Extended temperature rangewith accuracies of ±0.3°C or better, performed with reasonable cost and often with low power consumption. This article explains how platinumresistance temperature detectors (PRTDs) can perform measurements over wide temperature ranges of -200°C to +850°C, with absolute accuracyand repeatability better than ±0.3°C, when used with modern processors capable of resolving nonlinear mathematical equation quickly and costeffectively. This article is the second installment of a series on PRTDs. For the first installment, please read application note 4875, "High-Accuracy Temperature Measurements Call for Platinum Resistance Temperature Detectors (PRTDs) and Precision Delta-Sigma ADCs."
上傳時間： 2013-11-06
上傳用戶：WMC_geophy
The high defi nition multimedia interface (HDMI) is fastbecoming the de facto standard for passing digitalaudio and video data in home entertainment systems.This standard includes an I2C type bus called a displaydata channel (DDC) that is used to pass Extended digitalinterface data (EDID) from the sinkdevice (such as adigital TV) to the source device (such as a digital A/Vreceiver). EDID includes vital information on the digitaldata formats that the sink device can accept. The HDMIspecifi cation requires that devices have less than 50pFof input capacitance on their DDC bus lines, which canbe very diffi cult to meet. The LTC®4300A’s capacitancebuffering feature allows devices to pass the HDMI DDCinput capacitance compliance test with ease.
上傳時間： 2013-11-21
上傳用戶：tian126vip
ISA總線概述 ISA總線: (Industry Standard Architecture:工業標準體系結構）是IBM公司為PC/AT電腦而制定的總線標準，為16位體系結構，只能支持16位的I/O設備，數據傳輸率大約是16MB/S。也稱為AT標準。開始時PC機面向個人及辦公室，定義了8位的ISA總線結構，對外公開，成為標準（ISO ISA標準）。第三方開發出許多ISA擴充板卡，推動了PC機的發展。1984年推出IBM-PC/AT系統，ISA從8位擴充到16位，地址線從20條擴充到24條。1988年，康柏、HP、NEC等9個廠商協同把ISA擴展到32位，即EISA總線(Extended ISA)。
上傳時間： 2013-10-16
上傳用戶：dajin
pcie基本概念及其工作原理介紹：PCI Express®（或稱PCIe®），是一項高性能、高帶寬，此標準由互連外圍設備專業組（PCI-SIG）制 訂，用于替代PCI、PCI Extended (PCI-X)等基于總線的通訊體系架構以及圖形加速端口（AGP）。 轉向PCIe主要是為了實現顯著增強系統吞吐量、擴容性和靈活性的目標，同時還要降低制造成本，而這 些都是基于總線的傳統互連標準所達不到的。PCI Express標準在設計時著眼于未來，并且能夠繼續演 進，從而為系統提供更大的吞吐量。第一代PCIe規定的吞吐量是每秒2.5千兆比特（Gbps），第二代規 定的吞吐量是5.0 Gbps，而最近公布PCIe 3.0標準已經支持8.0 Gbps的吞吐量。在PCIe標準繼續充分利 用最新技術來提供不斷加大的吞吐量的同時，采用分層協議也便于PCI向PCIe的演進，并保持了與現有 PCI應用的驅動程序軟件兼容性。 雖然最初的目標是計算機擴展卡以及圖形卡，但PCIe目前也廣泛適用于涵蓋更廣的應用門類，包括網絡 組建、通信、存儲、工業電子設備和消費類電子產品。 本白皮書的目的在于幫助讀者進一步了解PCI Express以及成功PCIe成功應用。 PCI Express基本工作原理 拓撲結構 本節介紹了PCIe協議的基本工作原理以及當今系統中實現和支持PCIe協議所需要的各個組成部分。本節 的目標在于提供PCIe的相關工作知識，并未涉及到PCIe協議的具體復雜性。 PCIe的優勢就在于降低了復雜度所帶來的成本。PCIe屬于一種基于數據包的串行連接協議，它的復雜度 估計在PCI并行總線的10倍以上。之所以有這樣的復雜度，部分是由于對以千兆級的速度進行并行至串 行的數據轉換的需要，部分是由于向基于數據包實現方案的轉移。 PCIe保留了PCI的基本載入-存儲體系架構，包括支持以前由PCI-X標準加入的分割事務處理特性。此 外，PCIe引入了一系列低階消息傳遞基元來管理鏈路（例如鏈路級流量控制），以仿真傳統并行總線的 邊帶信號，并用于提供更高水平的健壯性和功能性。此規格定義了許多既支持當今需要又支持未來擴展 的特性，同時還保持了與PCI軟件驅動程序的兼容性。PCI Express的先進特性包括：自主功率管理； 先進錯誤報告；通過端對端循環冗余校驗（ECRC）實現的端對端可靠性，支持熱插拔；以及服務質量（QoS）流量分級。
上傳時間： 2013-11-29
上傳用戶：zw380105939
ngrep strives to provide most of GNU grep s common features, applying them to the network layer. ngrep is a pcap-aware tool that will allow you to specify Extended regular or hexadecimal expressions to match against data payloads of packets. It currently recognizes TCP, UDP and ICMP across Ethernet, PPP, SLIP, FDDI, Token Ring and null interfaces, and understands bpf filter logic in the same fashion as more common packet sniffing tools, such as tcpdump and snoop.
標簽： applying features network strives
上傳時間： 2014-01-15
上傳用戶：bcjtao
The JDOM build system is based on Jakarta Ant, which is a Java building tool originally developed for the Jakarta Tomcat project but now used in many other Apache projects and Extended by many developers.
標簽： originally developed building Jakarta
上傳時間： 2014-01-19
上傳用戶：xg262122
自適應(Adaptive)神經網絡源程序 The adaptive Neural Network Library is a collection of blocks that implement several Adaptive Neural Networks featuring different adaptation algorithms.~..~ There are 11 blocks that implement basically these 5 kinds of neural networks: 1) Adaptive Linear Network (ADALINE) 2) Multilayer Layer Perceptron with Extended Backpropagation algorithm (EBPA) 3) Radial Basis Functions (RBF) Networks 4) RBF Networks with Extended Minimal Resource Allocating algorithm (EMRAN) 5) RBF and Piecewise Linear Networks with Dynamic Cell Structure (DCS) algorithm A simulink example regarding the approximation of a scalar nonlinear function of 4 variables
標簽： collection implement Adaptive adaptive
上傳時間： 2015-04-09
上傳用戶：ywqaxiwang
小弟最近學習VC++，整理了一下VC++中控件的Extended Window Style以及Window Style，里面有詳細說明
標簽： VC
上傳時間： 2015-04-16
上傳用戶：yxgi5
項目描述: Trickster Streaming Server is a pure Perl MP3 streaming server with a simple Web interface that allows you to manipulate and browse the queue. The queue management API is done in a fairly simple UNIX manner, and can be easily Extended. Trickster Streaming Server是一個具有簡單 Web接口的純 Perl MP3流服務器，它讓你操作并瀏覽隊列。這個隊列管理 API 用一種相當簡單的UNIX方式來做，并能被容易的擴展。
標簽： Trickster Streaming interface streaming
上傳時間： 2013-12-13
上傳用戶：lz4v4
