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“‚ holes which direct the magnetic flux along the so-called direct axis. Typical pole numbers are 4 and 6. As the rotor is operating at synchronous speed and there
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consists of a stationary member called stator and a rotating member called rotor. However the induction motor differs from a dc machine in the following aspects. 1. Laminated stator 2. Absence of commutator 3. Uniform and small air gap 4. Practically almost constant speed The AC induction motor comprises two electromagnetic parts: • • Stationary part called the stator Rotating part called the rotor The stator and the rotor are each made up of • • An electric circuit‚ usually made of insulated
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Since the shaft of the motor moves only the number of degrees that it was designed for when each pulse is delivered‚ you can control the pulses that are sent and control the positioning and speed. The rotor of the motor produces torque from the interaction between the magnetic field in the stator and rotor. The strength of the magnetic fields is proportional to the amount of current sent to the stator and the number of turns in the windings. The stepper motor uses the theory of operation for magnets
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leading to the calculation of fields and currents in the rotor sheet and propulsion and levitation forces. Such problem can be tackled by vector potential or stream function approach. The present paper adopts the second approach. A second order partial differential equation has been formulated for calculation of stream function or current density in the rotor sheet. As the end effects have not been considered in the direction of width of the rotor sheet‚ the said formulation merges to a second order
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sketches and plots the requirement of tail rotor in a conventional single rotor helicopter. Describe the rotor transmission mechanism. [8+8] D L 2. (a) Discuss the aerodynamics of an airplane propeller and a ducted fan/rotor used for forward motion of a Hovercraft. R O (b) Provide the principal details of a Hovercraft in as far as its forward and hovering motion is concerned. [8+8] 3. A helicopter weighs 30‚000N and has a single rotor of 16m diameter. Using momentum theory estimate
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It must also be able to adjust the angle of the rotor blades with each revolution of the hub. The adjustability is provided by a device called the swash plate assembly‚ as shown in this photograph: The swash plate assembly has two primary roles: Under the direction of the collective control‚ the swash plate assembly can change the angle of both blades simultaneously. Doing this increases or decreases the lift that the main rotor supplies to the vehicle‚ allowing the helicopter to gain
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Steckerboard (Playboard) and rotors Steckerboard (Playboard): -Plug connections using a wire - A/C‚ B/R‚ Q/P‚ Z/L etc. Rotors: -26 rotational positions A-Z‚ or 01-26 (26 contacts that were wired in different ways for each rotor) - setting the 3 wheels in a certain position was the code for encrypting a message. Using The Enigma • Each enigma machine had to have the 3 rotors set in the same position in order to encode and decode message. In order to do this: 1) set up rotors to the specified wheel
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When the turning gear is engaged to / disengaged from the torbine generator rotor; iii) The reason why during turbine runup the turning gear mo- tor continues running for some time after the turning gear has disengaged from the turbine genemtor rotor; iv) The reason why during turbine rundown the turning gear motor is started up some time before the turning gear is actually needed to rotate the turbine generator rotor. c) For each of the operating states listed below‚ descnbe the ad-
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three-phase AC motors which run at synchronous speed‚ without slip. (In an induction motor the rotor must have some “slip”. The rotor speed must be less than‚ or lag behind‚ that of the rotating stator flux in order for current to be induced into the rotor. If an induction motor rotor were to achieve synchronous speed‚ no lines of force would cut through the rotor‚ so no current would be induced in the rotor and no torque would be developed.) Synchronous motors have the following characteristics: •
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A REPORT ON ASSEMBLY OF THE HIGH PRESSURE MODULE OF STEAM TURBINE BY APOORV MOHAN SHRIVASTAV UNDER THE GUIDANCE OF Shri. Jagarnath Orav Senior Manager (IMM) BHARAT HEAVY ELECTRICALS LIMITED‚ BHOPAL (MADHYA PRADESH) MANIPAL INSTITUTE OF TECHNOLOGY (A Constituent College of Manipal University) MANIPAL – 576104‚ KARNATAKA‚ INDIA CERTIFICATE This is to certify that this project report carried out by Mr. APOORV MOHAN SHRIVASTAV‚ student of B.E. AUTOMOBILE ENGINEERING‚ of MANIPAL
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