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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Background Name Ford Motor Company Logo Industries served Automotive Geographic areas served Worldwide Headquarters U.S. Current CEO Alan R. Mulally Revenue $ 134.3 billion (2012) Profit $ 5‚665 billion (2012) Employees 164‚000 (2011) Main Competitors Bayerische Motoren Werke AG‚ Chrysler Group LLC‚ Daimler AG‚ General Motors Company‚ Honda Motor Company‚ Nissan Motor‚ Tata Motors‚ Ltd.‚ Toyota Motor Corporation‚ Volkswagen AG and many other automotive companies. Ford Motor Company is one of the
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Subject: Nissan Motor Corporation Key Issue: The key issue that lies within this case is ultimately the management style and structure of Nissan and its quality manufacturing issues combined with the fact that he CEO of Nissan will soon be the CEO of two operation giants in a foreign market with different variables and structures within them. In addition to the quality issues that Nissan has had in the production of several of its vehicles‚ Nissans support structure for the upper management
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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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Question 1 Which role should marketing managers play in helping to formulate business-level (SBU) strategies in a large diversified firm such as 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
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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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