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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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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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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information from http://www.researchandmarkets.com/reports/554957/ Tata Motors Limited - SWOT Analysis Description: The Tata Motors Limited - SWOT Analysis company profile is the essential source for top-level company data and information. Tata Motors Limited - SWOT Analysis examines the company’s key business structure and operations‚ history and products‚ and provides summary analysis of its key revenue lines and strategy. Tata Motors (or the company) is one of the leading automotive vehicle manufacturing
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Charcot-Marie-Tooth disease (CMT) also known as Hereditary Motor Sensory Neuropathy (HMSN) is a genetic heterogeneous disorder with a common clinical phenotype. It’s the most common inherited neuromuscular disease‚ with there being 200‚000 cases in the EU (Pareyson and Marchesi‚ 2009). CMT is a group of diseases that affect the periphery nerves in the body‚ motor and sensory nerves are affected however in some rare cases only the motor nerves are affected; distal hereditary motor neuropathy (dHMN)
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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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SWOT analysis of General Motors This is a General Motors Company SWOT analysis for 2013. For more information on how to do SWOT analysis please refer to our article. Company background General Motors Company (GM) is a corporate that designs‚ builds and sells cars and trucks. Name Industries served Geographic areas served Headquarters Current CEO Revenue Profit Employees Main Competitors General Motors Company Automotive Worldwide U.S. Daniel Akerson $ 152.3 billion (2012) $ 4.9 billion (2012)
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