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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Types of DC Motors and DC Generators MOTORS – convert electrical energy to mechanical energy Motors and generators are the most frequent used electrical machines. ❖ Generators action can take place when and only when‚ there is a relative motion between conducting wires and magnetic lines of force. ❖ Electric motor is in operation when it is supplied with electrical energy and develops torque‚ that is‚ a tendency to produce rotation. ❖ In DC generator‚ the armature winding is mechanically
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DC Motor Drive Basics - Part 4: Chopper-fed dc motor drives Austin Hughes 11/11/2008 2:51 PM EST [Part 1 begins with an overview of the operation of thyristor-fed DC motor drives. Part 2 continues with a look at converter output impedance‚ four-quadrant operation‚ single- and double-converter reversing drives and power factor and supply effects. Part 3 examines the operation of a standard dc drive system with speed and current control.] CHOPPER-FED D.C. MOTOR DRIVES If the source of supply
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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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control the use of electrical power to equipment‚ usually a motor. As the name implies‚ starters “start” motors. They can also stop them‚ reverse them‚ accelerate them‚ and protect them. Starters are made from two building blocks‚ contactors and overload protection: • Contactors control the electric current to the motor. Their function is to repeatedly establish and interrupt an electrical power circuit. • Overload Protection protects motors from drawing too much current and overheating‚ from literally
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How Stepper Motors Work Stepper motors consist of a permanent magnet rota ng sha ‚ called the rotor‚ and electromagnets on the sta onary por on that surrounds the motor‚ called the stator. Figure 1 illustrates one complete rota on of a stepper motor. At posi on 1‚ we can see that the rotor is beginning at the upper electromagnet‚ which is currently ac ve (has voltage applied to it). To move the rotor clockwise (CW)‚ the upper electromagnet is deac vated and the right electromagnet is ac vated‚ causing
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MOTOR TEMPERATURE RATINGS A frequently misunderstood subject related to electric motors is insulation class and temperature ratings. This paper tries to describe‚ in basic terms‚ the temperature relationships that are meaningful in standard AC induction motors. Some of the same information can be applied to DC motors but DC motors are more specialized and some of the ratings are slightly different. Perhaps the best way to start is to define the commonly used terms. MOTOR SURFACE TEMPERATURES
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for the purpose of lightening and power the field of electric motors especially the AC type has shown a remarkable development in all prospects all over the world. As a result of the technological advancements the engineers throughout the world tried their best of best to come out with the most energy efficient and safe machines particularly‚ in the context of electric motors. In this report we will confine our discussion up to electric motors‚ their construction‚ operations‚ applications‚ performance
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angle of the shaft. This source of information about the shaft of the motor is called “feed-back” because it sends back information from the controlled actuator to the controller. 1.2 METHODOLOGY: LASER BASED SPEED SENSOR The methodology of our project is shown in the block diagram in fig 1.1 . LCD DISPLAY MOTOR DRIVER MOTOR INPUTS MCU MOTOR CONTROLLER Fig 1.1: Block Diagram of DC Motor Speed Control 1. INPUTS: User defined or user desirable speed
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CASE ANALYSIS - DOMINION MOTORS MARKETING PROGRAM DESIGN Under the Guidance of Dr. Waheed Presented by: RohithDesikan(95) SiddhantKejriwal(109) SalilSrivastava(99) Swati Hasija(116) NikunjShah(105) Vishal Godara(127) Case Introduction The case‚ presented by Professor E. Raymond Corey‚ presents to the potential threat to a company‚ Dominion Motors‚ by a report brought up by John Bridges‚ a big name in the whole Oil Production domain. DMC was a
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