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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General Motor? Visit the company’s South African website at http://www.gmsa.co.za and use the information obtainable from it to formulate your answer. At the business unit level the strategic issues of General Motors are both practical co-ordination of operating units and about developing and sustaining a competitive advantage for the cars and industry that they provide. The marketing manager’s role is to formulate and implement strategies that deal with the positioning: General Motors has to find
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investments is high‚ increasing to 5.86%. | 2.0 | Liquidity Ratio (Cash) increased to 0.98 | 3.0 | Inventory Turnover is high‚ increasing to 13.2. | 1.0 | Working Capital improved to $23.55. | 3.0 | Target EPS for 2011 of 1.89 was achieved. | 2.0 | Ford reported a 6.8 percent sales increase in December 2010 | 4.0 | | 15.0 | Industry Strength | The growth potential is very high most especially for the existence of small cars like Focus. | 5.0 | Profit potential is high due to the needs of
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Yamaha Motor Objectives In an effort to satisfy its loyal customers‚ Yamaha Motor Philippines‚ Inc. launches its service campaign‚ dubbed as the "Yamaha At Ur Service". Our campaign’s objectives are as follows: 1. To provide periodic and preventive maintenance to Yamaha customers‚ in order to lengthen the motorcycle’s life‚ as well as to make it safer for road use. 2. Promote YAMALUBE to Yamaha motorcycle owners. Changing the motorcycle lifestyle in the Philippines is one
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defined in a myriad of ways. I define "influence" in terms of direct change in the concrete circumstances of individual lives. It would be hard to identify anyone whose influence has been both more widespread and more beneficial than Henry Ford’s. Ford didn’t invent modern industry. He didn’t invent interchangeable parts or the assembly line. But he combined these elements in a way that revolutionized the meaning of manufacturing. And he did so deliberately. Ford’s genius was to make cars simple
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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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General Motors Corporation S B Davenport University I often wonder if in 1982 when R.E olds first converted his father’s naval and industrial engine factory into the Olds Motor Vehicle Company to build horseless carriages‚ did he know he was making way to for the largest full-line vehicle manufacturer and marketer (General Motors Corporation. 2011). The beginning of General Motors (GM) Corporation all begin from the minds of just a four innovative engineers and good businessman. When R.E.
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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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