converts electrical energy into mechanical energy. Mechanical Input Electrical input ELECTRICAL MACHINES Generator ELECTRICAL MACHINES Motor Electrical Output Mechanical output If current caring conductor is placed in magnetic field then a force is generated on current caring conductor. F = BIL. Sinθ If all three B and L are Perpendicular to each other‚ then F = BIL If a conductor is moving in magnetic field then an EMF is generated in a conductor . E = BVL.
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frequency ac supply to a dc supply by using a rectifier. The dc supply is then converted to a variable-frequency ac supply‚ which can maintain a constant air-gap flux in the motor by an inverter. 2.3 Synchronous speed When the balanced three-phase currents flow through three-phase stator windings of the motor‚ a rotating magnetic field or magnetic motive force (mmf) is produced. The speed of the rotating mmf is called the synchronous speed and it depends on the supply frequency and the number of the
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Ammeters are employed for measuring current in a circuit and connected in series with the circuit. As ammeter is connected in series‚ the voltage drop across ammeter terminals should be as low as possible. This requires that the resistance of the ammeter should be as low as possible. The current coil of Ammeter has low current carrying capacity whereas the current to be measured may be quite high. For this reason a low resistance is connected in parallel to the current coil. b) VOLTMETER Voltmeters
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graphical work. 7. This paper may be retained by the candidate. ELEC4240/9240 - Power Electronics 1 See over for Question 1 QUESTION 1 The input current drawn for an ac source line connected to a power converter is indicated in figure Q1‚ together with the ac input voltage of the line to neutral of the supply. The current waveform is flat-topped quasi-square of amplitude 150A. The ac source voltage is given by v = Vmax sin ω t where Vmax is 340 V‚ ω = 2π f ‚ where f is the supply
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5V Simple Power Supply for Digital Circuits Summary of circuit features • Brief description of operation: Gives out well regulated +5V output‚ output current capability of 100 mA • Circuit protection: Built-in overheating protection shuts down output when regulator IC gets too hot • Circuit complexity: Very simple and easy to build • Circuit performance: Very stable +5V output voltage‚ reliable operation • Availability of components: Easy to get‚ uses only very common basic
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School of Electrical and Electronic Engineering First Year Laboratory Semester 2 Module: Energy Transport and Conversion Code: EEEN10027 Lecturer: Dr Schofield Experiment: 3-Phase power system investigations Aims • • • To introduce 3-phase power systems as a common method to transmit electrical power over long and short distances. To investigate the effects of 3-phase loads on electrical power systems To investigate the differences between DELTA and STAR connections
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CIRCUITS I: ELECTRIC CURRENT 1. What do you predict for the rankings of the brightness of bulbs A‚ B‚ and C in Figure 2-1? A>B>C A being the brightest 2. How do you predict that changing the direction of the current by reversing the connections to the battery in Figure 2-1 would change the rankings in (1)? I don’t think it will change at all. The brightness should be the same in diagram b and diagram a it should also stay the same. 3. How will you compare the currents in the circuits
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across the 200V mains. Find the values of resistance that should be connected across the first bulb‚ so that each bulb may get proper current at the proper voltage. (a) Compare electric circuit and magnetic circuit by their similarities and dissimilarities. (b) Derive an expression for the energy stored in an inductor of self inductance ‘L’ henry carrying the current of ‘I’ amperes. OR (b) A mild steel ring of 30 cm mean circumference has a cross-sectional area of 6 cm2 and has a winding of 500 turns
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Advanced Modulation Techniques for Power Converters by Ali Mehrizi-Sani A Thesis submitted to the Faculty of Graduate Studies of The University of Manitoba in partial fulfilment of the requirements of the degree of Master of Science Department of Electrical and Computer Engineering University of Manitoba Winnipeg‚ Manitoba Copyright c 2007 by Ali Mehrizi-Sani Acknowledgement Submission of this thesis marks a milestone in my academic career. After 18 years of schooling‚ there
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Representation of Sinusoidal Signal by a Phasor and Solution of Current in R-L-C Series Circuits Version 2 EE IIT‚ Kharagpur In the last lesson‚ two points were described: 1. How a sinusoidal voltage waveform (ac) is generated? 2. How the average and rms values of the periodic voltage or current waveforms‚ are computed? Some examples are also described there. In this lesson‚ the representation of sinusoidal (ac) voltage/current signals by a phasor is first explained. The polar/Cartesian (rectangular)
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