A DC motor is a mechanically commutated electric motor powered from direct current (DC). The stator is stationary in space by definition and therefore so is its current. The current in the rotor is switched by the commutator to also be stationary in space. This is how the relative angle between the stator and rotor magnetic flux is maintained near 90 degrees‚ which generates the maximum torque. DC motors have a rotating armature winding but non-rotating armature magnetic field and a static field
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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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INTRODUCTION Tesla Motors is a global enterprise specializing in the design‚ production‚ and marketing of electric powered vehicles founded in 2003 by the young businessman‚ Elon Musk. Elon is well known for co-founding paypal‚ and now he amazes the world again with his incredible vision of Tesla Motors‚ and being the main product architect. Tesla Motors appeals to the environmentally friendly market‚ by currently being the only company to sell a zero-emission sports car. Tesla’s fundamental
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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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Conquerors by Henry Treece 1933 ‘Conquerors’ written in 1933 by Henry Treece is a poem about the horrors of the aftermath of war in the point of view of a victorious soldier. Throughout the text the persona is a soldier as there is a sense a teamwork shown by the author’s use of “we” or “not one amongst us” eliminating one’s individuality. Also the last sentence implies that they are away from home as they are thinking about it rather than looking at it. By saying “No one told us victory was like
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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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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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http://www.gm.com/company/about-gm http://www.samples-help.org.uk/mission-statements/general-motors-vision-statement.htm http://www.inc.com/resources/startup/articles/20050201/missionstatement.html http://en.wikipedia.org/wiki/History_of_General_Motors#Corporate_restructuring http://www.scribd.com/doc/23232458/GM-Competitive-Advantage-and-Market-Analysis-PDF William Pelfrey (2006) “Billy‚ Alfred and General Motors” New York‚ NY. AMACON
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