Equivalent circuit

This chapter introduces twoinductance, T and T', perphase equivalent circuits of the induction motor for explanation of the scalar control methods. The openloop, Constant Volts Hertz, and closedloop speed control methods are presented, and field weakening and compensation of sup and stator voltage drop are explained. Finally, scalar torque control, based on decomposition of the stator current into the fluxproducing and torqueproducing components, is described.
13p gaugau1905 09122015 9 0 Download

This chapter include contents: Introduction to Polyphase Induction Machines, currents and fluxes in Polyphase Induction Machines, induction – motor equivalent circuit, analysis of the equivalent circuit, torque and power by use of Thevenin’s theorem, parameter determination from no – load and blocked – rotor tests, effects of rotor resistance.
39p youcanletgo_04 17012016 7 1 Download

This chapter include all of the following content: Introduction to polyphase synchronous machines, synchronous – machine inductances and equivalent circuits, performance characteristics, effects of salient poles, power – angle characteristics of salient – pole machines, permanent – magnet ac motors.
62p youcanletgo_04 17012016 6 0 Download

For your electronics hobby entertainment; ENJOY! It is assumed that you have AT LEAST the equivalent of a Basic Electronics certificate for the electronics projects listed on this page. Other projects require more advanced electronics. A lot of these circuits assume the latter so I will no longer answer the tons of emails in regards to that. If you wish to learn more about electronics there is enough of that available on the internet. Circuits' Message Board Ask your questions here. Someone may answer them....
124p portalix 05042011 237 87 Download

Introduction 1 Ideal Diode 1 Semiconductor Materials 3 Energy Levels 6 Extrinsic Materials—n and pType 7 Semiconductor Diode 10 Resistance Levels 17 Diode Equivalent Circuits 24 Diode Specification Sheets 27 Transition and Diffusion Capacitance 31 Reverse Recovery Time 32 Semiconductor Diode Notation 32 Diode Testing 33 Zener Diodes 35 LightEmitting Diodes (LEDs) 38 Diode Arrays—Integrated Circuits 42 PSpice Windows 43
0p kid2kiss 02122012 71 21 Download

We show that a graph has an orientation under which every circuit of even length is clockwise odd if and only if the graph contains no subgraph which is, after the contraction of at most one circuit of odd length, an even subdivision of K2,3. In fact we give a more general characterisation of graphs that have an orientation under which every even circuit has a prescribed clockwise parity. Moreover we show that this characterisation has an equivalent analogue for signed graphs.
20p thulanh5 12092011 29 2 Download

Lecture Electric circuit theory: Circuit theorems presents the following content: Source transformation, linearity and superposition, Thévenin Equivalent Subcircuits, Norton Equivalent Subcircuits, maximum power transfer.
52p youcanletgo_04 17012016 8 0 Download

Lecture Electric circuit theory  Twoport networks presents the following content: Parameters, relationships between parameters, twoport network analysis, interconnection of networks, equivalent twoport networks of magnetically coupled circuits,...
93p youcanletgo_04 17012016 12 0 Download

Equivalent circuit device models are critical for the accurate design and modelling of RF components including transistors, diodes, resistors, capacitors and inductors. This chapter will begin with the bipolar transistor starting with the basic T and then the π model at low frequencies and then show how this can be extended for use at high frequencies. These models should be as simple as possible to enable a clear understanding of the operation of the circuit and allow easy analysis. They should then be extendible to include the parasitic components to enable accurate optimisation....
62p doroxon 16082010 180 67 Download

Electrical machines are almost entirely used in producing electricity, and there are very few electricityproducing processes where rotating machines are not used. In such processes, at least auxiliary motors are usually needed. In distributed energy systems, new machine types play a considerable role: for instance, the era of permanent magnet machines has now commenced. About half of all electricity produced globally is used in electric motors, and the share of accurately controlled motor drives applications is increasing.
531p nguyenthai_thinh 21032013 49 24 Download

Di®erent types of numbers ¯nd di®erent application in the physical world. Whole numbers work well for counting discrete objects, such as the number of resistors in a circuit. Integers are needed when negative equivalents of whole numbers are required. Irrational numbers are numbers that cannot be exactly expressed as the ratio of two integers, and the ratio of a perfect circle's circumference to its diameter (¼) is a good physical example of this.
371p ledung 13032009 90 22 Download

In this chapter, we will ﬁnd out how to get the most solar energy out of the sun by considering the time, the altitude angle, the radiation and the photovoltaic (PV) materials. A simple PV model helps to understand the mechanism of energy conversion  solar to electricity. We will further use a simple equivalent circuit to represent a PV cell to investigate its currentvoltage characteristics.
14p vanthang122141 13052011 66 18 Download

In this chapter, we will discuss a more accurate equivalent circuit for a PV cell. This circuit helps us to have better prediction and understanding of PV cell currentvoltage characteristics as well as at diﬀerent types of load connected to the PV panel, which is made up of an array of PV cells. Later in this chapter we will discuss the concept of maximum power point tracker (MPPT).
18p vanthang122141 13052011 59 14 Download

Chapter 8, Solution 1. (a) At t = 0, the circuit has reached steady state so that the equivalent circuit is shown in Figure (a). 6Ω VS + − 6Ω + 6Ω + vL 10 H (b) v − 10 µF − (a) i(0) = 12/6 = 2A, v(0) = 12V At t = 0+, i(0+) = i(0) = 2A, v(0+) = v(0) = 12V (b) For t 0, we have the equivalent circuit shown in Figure (b). vL = Ldi/dt or di/dt = vL/L Applying KVL at t = 0+, we obtain, vL(0+) – v(0+) + 10i(0+) = 0 vL(0+) – 12 + 20 = 0,...
61p longmontran 15012010 53 11 Download

Before connecting the ARIA SOHO to the telephone network, you may be required to notify your local serving telephone company of your intention to use "customer provided equipment". You may further be required to provide any or all of the following information: PSTN line Telephone numbers to be connected to the system Model name Local regulatory agency registration number Ringer equivalence Registered jack The required regulatory agency registration number is available from your local representative of LGNortel....
66p thaudiennhe 25112010 51 10 Download

• Ac current gain = độ lợi dòng ac • Ac emitter resistance = điện trở ac ở cực phát • Ac equivalent circuit = mạch tương đương ac • Basebiased amplifier = mạch khuếch đại được phân cực nền ề • Bypass capacitor = tụ vòng qua, rẽ mạch, bỏ qua • CB amplifier= mạch KĐ B chung p ạ g • CC amplifier= mạch KĐ C chung Từ Vựng (2) • • • • • • CE amplifier= mạch KĐ E chung Coupling capacitor = tụ ghép DC current gain = độ lợi dò DC t i l i dòng...
39p vankent 13072010 79 8 Download

The 2N4393 is operated as a Miller integrator. The high Yfs of the 2N4393 (over 12,000 mmhos @ 5 mA) yields a stage gain of about 60. Since the equivalent capacitance looking into the gate is C times gain and the gate source resistance can be as high as 10 MX, time constants as long as a minute can be achieved.
14p vankent 13072010 52 6 Download

There is a basic law in thermodynamics; the law of conservation of energy, which states that energy may neither be created nor destroyed just can be transformed. Nature is an expert using this physics fundamental law favouring life and evolution of species all around the planet, it can be said that we are accustomed to live under this law that we do not pay attention to its existence and how it influence our lives.
262p nhatkyvodanh 05092012 41 7 Download

Flux and Voltage Induction Machines 6.1 Description 6.2 Concept of Operation 6.3 Torque Development 6.4 Operation of the Induction Machine near Synchronous Speed 6.5 Leakage Inductances and their Effects 6.6 Operating characteristics 6.7 Starting of Induction Motors 6.8 Multiple pole pairs Synchronous Machines and Drives 7.1 Design and Principle of Operation 7.1.1 Wound Rotor Carrying DC 7.1.2 Permanent Magnet Rotor 7.2 Equivalent Circuit 7.3 Operation of the Machine Connected to a Bus of Constant Voltage and Frequency 7.4 Operation from a Source of Variable Frequency and Voltage...
132p nunongnuna 01042013 28 5 Download

The conducting polymer poly(5hydroxy1,4naphthoquinoneco5hydroxy3acetic acid1,4 naphthoquinone) with electroactive quinone group was investigated by Electrochemical Impedance Spectroscopy (EIS) in aqueous medium. The evaluations of parameters of equivalent circuit in term of applied potential were considered. The simulated EIS data presented a good agreement with the results obtained by other electrochemical methods.
5p uocvong03 24092015 11 2 Download