This chapter introduces two-inductance, T and T', per-phase equivalent circuits of the induction motor for explanation of the scalar control meth-ods. The open-loop, Constant Volts Hertz, and closed-loop 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 flux-producing and torque-producing components, is described.
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.
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.
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....
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.
Lecture Electric circuit theory: Circuit theorems presents the following content: Source transformation, linearity and superposition, Thévenin Equivalent Subcircuits, Norton Equivalent Subcircuits, maximum power transfer.
Lecture Electric circuit theory - Two-port networks presents the following content: Parameters, relationships between parameters, two-port network analysis, interconnection of networks, equivalent two-port networks of magnetically coupled circuits,...
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....
Electrical machines are almost entirely used in producing electricity, and there are very few
electricity-producing 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
About half of all electricity produced globally is used in electric motors, and the share of
accurately controlled motor drives applications is increasing.
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.
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 current-voltage characteristics.
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 current-voltage 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).
Chapter 8, Solution 1. (a) At t = 0-, the circuit has reached steady state so that the equivalent circuit is shown in Figure (a).
+ vL 10 H (b) v −
10 µF −
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,...
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 LG-Nortel....
• Ac current gain = độ lợi dòng ac • Ac emitter resistance = điện trở ac ở cực phát • Ac equivalent circuit = mạch tương đương ac • Base-biased 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...
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.
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.
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...
The conducting polymer poly(5-hydroxy-1,4-naphthoquinone-co-5-hydroxy-3-acetic acid-1,4- 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.