The speed of an asynchronous motor rotating field and thus its rotor speed depends on the number of pairs of poles in the stator field .the rotor speeds n are lower than the table values by the amount of the relevant slip speed ns. Motors are designed with up to three stators windings‚ which have different number of pairs of poles. They can therefore run at up to pairs of poles. They can be in any desired ratio to one another. A pole-changing switch is used to changing poles for the desires speed
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GROUP 4 JULY 26‚ 2013 EE 4101 ENGR. KENNETH F. FAJILAN Reluctance Motor Introduction A reluctance motor is a type of electric motor that induces non-permanent magnetic poles on the ferromagnetic rotor. Torque is generated through the phenomenon of magnetic reluctance. There are various types of reluctance motor: Synchronous reluctance Synchronous reluctance motors have an equal number of stator and rotor poles. The projections on the rotor are arranged to introduce internal flux “barriers“
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TATA MOTORS I. INTRODUCTION Tata Group is an Indian multinational company headquartered MUMBAI‚ MAHARASHTRA‚ INDIA. Tata group business is spread across 7 sectors their main sector being steels. Their empire is spread across 6 continents and has its presence in 80 nations. The combined market capitalization of all the 31 listed Tata companies was $89.88 billion as of March 2012.Tata group gets its major revenue from overseas market contributing 58%. Tata Motors Limited is an Indian multinational
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AC Motors vs DC Motors DC Motors Prof. Dr. M. Zahurul Haq zahurul@me.buet.ac.bd http://teacher.buet.ac.bd/zahurul/ Department of Mechanical Engineering Bangladesh University of Engineering & Technology e316.eps ME 475: Mechatronics AC motors are smaller in size‚ reliable and less costly. AC motors run at fixed speed set by the line frequency. Easy speed‚ torque & direction controls in DC motors. DC motors are generally operate at lower voltages which makes these easier to interface with control
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ELECTRIC MOTOR CONTROLS Once the proper motor is selected‚ understanding the many various control devices available and their uses and limitations becomes an important part related to reliable operation and protection of the motor and the personnel using the motor. Motor Control Topics There are four major motor control topics or categories to consider. Each of these has several subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor control equipment can accomplish
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Answer 1: Porter’s five forces analysis suggest that the market in which Dunkin Donuts and Starbucks operate is competitive. According to his force Industry competition‚ the rivalry in between the coffee stores is fierce. Where Starbucks open stores across the street from the other coffee shops‚ McDonalds have started giving coffee for a dollar‚ any size. Other local coffee shops are also there which provide a variety of coffee and people are getting used to it. So the competition is not only amongst
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J.K. Rowling: Harry Potter and the Philosopher’s Stone How has J.K. Rowling taken the elements of the traditional school story and adapted them so as to create a work of popular modern appeal? The typical school story is “Tom Brown’s Schooldays” by Thomas Hughes‚ which was published in 1857. The novel is set in a real life boarding school‚ Rugby‚ and the headmaster is a real historical figure‚ Dr. Thomas Arnold‚ who is famous for introducing the concept of “muscular Christianity”. The hero
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Problem Definition John Bridges‚ the chief electrical engineer of Hamilton Oil Company‚ has concluded through motor testing that DMC competitors Spartan Motors and the Universal Motor Company of Canada offer the first and second choice motors on the market‚ respectively. DMC’s position as the third choice could prove quite detrimental to its market share because Hamilton is the largest active oil company in Canada‚ operating over 30% of producing wells‚ and Bridges is extremely influential in
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SISTEMAS DC Motors Catedrático: Ing. Gustavo Mendoza Leal Alumno: Alfredo Valdés Cárdenas Introduction A DC motor is a type of electrical machine that converts direct current into mechanical power by means of a magnetic field. DC motors are widely used in field applications because of their many advantages over AC motors such as speed control‚ high starting torque‚ quick starting‚ stopping‚ reverse and acceleration and free from harmonics found in AC. Applications of DC motors include but
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ultrasonic motor INTRODUCTION All of us know that motor is a machine which produces or imparts motion‚ or in detail it is an arrangement of coils and magnets that converts electric energy into mechanical energy and ultrasonic motors are the next generation motors. In 1980‚the world’s first ultrasonic motor was invented which utilizes the piezoelectric effect in the ultrasonic frequency range to provide its motive force resulting in a motor with unusually good low speed‚ high torque
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