Chapter (9) Single-Phase Motors Introduction As the name suggests‚ these motors are used on single-phase supply. Singlephase motors are the most familiar of all electric motors because they are extensively used in home appliances‚ shops‚ offices etc. It is true that singlephase motors are less efficient substitute for 3-phase motors but 3-phase power is normally not available except in large commercial and industrial establishments. Since electric power was originally generated and distributed
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Three-phase induction machines account for the great majority of applications that call for motors with power ratings over 5 hp. They are used to power pumps‚ fans‚ compressors‚ and grinders‚ and in other industrial applications. Rotating Stator Field. The stator of a three-phase induction machine contains a set of windings to which three-phase electrical power is applied. The stator field can be visualized as a set of north and south poles rotating around the circumference of the stator. (North
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3 Three-Phase A.C. Circuits Learning Outcomes This chapter introduces the concepts and principles of the three-phase electrical supply‚ and the corresponding circuits. On completion you should be able to: 1 Describe the reasons for‚ and the generation of the three-phase supply. 2 Distinguish between star (3 and 4-wire) and delta connections. 3 State the relative advantages of three-phase systems compared with single-phase-systems. 4 Solve three-phase circuits in terms of phase and line quantities
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bigger vehicle will. A car with a manual transmission is better for an electric car since cars with electric motors do not necessarily need a transmission. A manual car uses a controller rather than a transmission to make the car run backwards and forwards. In addition‚ an automatic transmission will waste too much of your car’s energy. The car you choose should also have enough room for an electric battery. You will want to be able to access the battery easily for any maintenance. You will
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The Cross Field Theory of Single Phase Induction Motor The cross field theory of single phase induction motors looks at the induction motor from a totally different point of view. This theory is connected with the voltages & currents that the stationary stator magnetic field can induce in the bars of the rotor when the rotor is moving. Consider a single phase induction motor with a rotor which has been brought up to speed by some external method. Such a motor. Voltages are induced in the bars of
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Torques Introduction During this lab you will become more familiar with the concepts of torque. The purpose of this lab is to determine if the rotational equilibrium condition‚ Στ = 0‚ holds experimentally. Equipment Meter stick (1) - no metal ends Fulcrum (1) Clamps (4) Weight Hanger (1) Mass Set (1) Digital Scale (1) Theory For a body to be in static equilibrium‚ two conditions have to be met: ΣF = 0 and Στ = 0 where F is force and τ is torque. (The torque is the force times the lever arm
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1. INTRODUCTION 1.1) INTRODUCTION OF 3 PHASE INDUCTION MOTOR: The three phase induction motors are used in many industrial applications due to their reliability‚ low cost and high performance. Whereas this popular ac motor performance is affected by following type of faults. 1. ELECTRICALLY RELATED FAULTS (33%): The faults under this classification are single phasing‚ over/under voltage‚ overload over temperature. 2. MECHANICAL RELATED FAULTS (32%): The rotor winding failure‚ stator winding failure
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How the efficiency of induction motor is measured? S. Corino E. Romero L.F. Mantilla Department of Electrical Engineering and Energy E.T.S.I.I. y T. Universidad de Cantabria Avda de Los Castros‚ 39005 Santander (Spain) phone:+34 942 201381‚ fax:+34 942 201381‚ e-mail: mantillf@unican.es Abstract The efficiency is of paramount importance nowadays due to increasing electrical energy demand‚ increasing awareness of environmental problems as greenhouse effects and increasing fossil fuel prices
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Enough is enough The United States for the past 100 years has been a forward presence around the world. America’s foreign policy has had many successful missions providing humanitarian aid to countries suffering from natural disasters and inhabitable living conditions. America is also first to respond to countries that are on the brink of war‚ providing military assistance and assets to help spread democracy around the world. But at what cost is America willing to go to‚ to help these countries
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Analysis Torque is the ability of force to change the rotational motion of a particle. It is also called the moment of force. It is always specified with regard to the axis of rotation. On the experiment the axis of rotation serves as the model balance. This means that as much as torque is directly proportional with the force applied on a particle‚ it is also dependent on the perpendicular distance of the applied force to the axis of rotation. On the first activity we need to determine
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