Join 5,120,000 engineers with over 3,070,000 free cad files join the community. Introduction to basic notions on electric power 5 electric current conductor lines of force fig. The impact of the rotor slot number selection on the induction motors is investigated. Stator of a brushless dc motor from computer cooler fan. Rotor is usually made as squirrelcage, and it is inserted in stators hole. This two softwares will make any job of any oil and gas industry easy, stress free, manageable and up to date, efficiency is 100%. The stator rotor interaction is an important issue in turbomachinery design when the highest performances are targeted. The impact of the rotor slot number on the behaviour of. The rotating machine consists of three main components in stator such as the copper conductors, the stator core and the insulation.
The rotor will constantly be turning to align its magnetic field with that of the stator field. The electromagnetic forces acting between the rotor and stator when the rotor is eccentric with respect to the stator have been the point of interest and mathematical models have been developed almost through the whole history of the electrical machines. Pdf this paper presents a complex study of the performance developed by. For small blade heights, being the stator secondary flows more important, a more complex interaction is. The squirrel cage and the phase wound are the rotor types. Slip ring rotor construction is laminated and slotted. The rotor is a large magnet with poles constructed of steel lamination projecting out of the rotor s core. The university of manchester, school of chemical engineering and analytical sciences, manchester, m60 1qd, uk. Test every lead of the stator s connector and note the readings. Firstly, analytical equations will reveal the spatial harmonic index of the air gap magnetic flux density, connected to the geometrical features and the saturation of the induction motor. Threephase ac generator working electrical academia. The rotor core and the rotor winding are the rotor part. Pdf induction motor with outer rotor and ring stator winding for.
The variables of the induction machine during free acceleration or on noload are. Note the salient pole construction of the stator and the slotted rotor. As previously stated, the torque developed by the machine is a consequence of the magnetic. In mechanical terms, the rotor is the rotating part, and the stator is the stationary part of an. Demerdash, ieee lifefellow abstract in this paper, stator and rotor failures in squirrelcage induction machines are modeled using the magnetic equivalent. Typical induction motor rotors the magnetic field generated in the stator induces an emf in the rotor bars. Sizov, ieee student member, chiachou yeh, ieee member, nabeel a. Us10468929b2 rotor for a rotating electrical machine. A three phase induction motor mainly consists of two parts called as the stator and the rotor. The impact of different stator and rotor slot number combinations on iron losses of a threephase induction motor at noload. The rotor body is attached to the shaft in order to transmit the created torque from inside the motor to the driven application. If your rotor andor stator is damaged, broken, or worn down an electrical current cannot be made and your generator wont work properly. The poles are supplied by direct current or magnetized by permanent magnets.
Housed in the stator, the rotor and stator teeth can lock when they are in. In this chapter, the mathematical model of induction motor based on. The induction machine has two electrically active elements. Stator and rotor difference between stator and rotor the term, stator is derived from the word stationary. Workings of a brushed electric motor with a twopole rotor armature and permanent magnet stator. Rotor stator pumps explained by putzparts24 youtube.
Is your generator not producing power or is the battery not holding a charge. Because the number of stator poles is constant for a particular 3phase ac generator, the output frequency is regulated by controlling the speed of the rotor the rotating electromagnetic field. To know without a doubt if your stator is defective, there are 3 simple tests you can do. To overcome these difficulties, high performance vector control algorithms are developed which can decouple the stator phase currents by using only the measured stator current, flux and rotor speed. The difference in speed relative motion is necessary to maintain the torque. The rotating magnetic field is the rotor and the windings in which current is. Our rotors are available in alloy steel with hard chrome plating, which provides resistance to abrasion and wear. After cleaning the threads with alcohol, or other suitable solvent, apply a few drops of blue. Winding design, modeling, and control for polephase modulation induction motors article pdf available in ieee transactions on magnetics 492. Pdf the electromechanical characteristics of induction motors depend on the used stator and rotor slot combination. In a generator, the stator output current is induced to flow in the copper conductors as a reaction to the rotating magnetic field from the rotor. In turn, a current is produced in the rotor bars and shorting ring and another magnetic field is. Connect the other test lead to one of the stator excitation wires figure 3.
A rotor 14 for a rotating electrical machine is disclosed. The other differences between the stator and rotor are shown below in the comparison chart. Rotor lower left and stator upper right of an electric motor. The output voltage is taken from the rotor by the sli p rings and brushes. The permanent magnet pm flux linking the stator winding has effectively two or four pole flux pattern, which depends on the number of stator poles and independent of number of rotor poles. Pdf winding design, modeling, and control for polephase. Hi electricpete, from past experience only, there is no correlation that one could reference that i know of. In this animation we want to show you how a rotor stator pump works.
In understanding the above terminology, note the following. Physical structure and configuration of dc machines. Design and analysis of stator, rotor and blades of the. Operating error during offline manual regulator operation. The direction of the lines of force is given by the law of the screwdriver.
Volume 320, issue 20, october 2008, pages e891e895. The slots of the rotor contains the rotor conductor or rotor winding. The rotor 14 comprises a plurality of poles 24, each of the poles comprising a plurality of damper slots 30 for damper bars 32. The mathematical models can be applied in analytical calculations or numerical analysis. Since 60 hertz is a standard frequency throughout the united states and canada, the following list gives the synchronous rotor speeds for 3phase ac. Magnetic equivalent circuit modeling of induction machines. With the use of the rotating magnetic field from the stator, the rotor is able to produce torque. Different characters mark the interaction process in highpressure or lowpressure turbines depending both on the blade height and on the reynolds number. The reading of each combination should be the same test leads 12, 23, and 31. The stator is the stationary part of the induction motor, and the rotor is the rotating part.
The rotor and stator are separated by an air gap which allows free rotation of the rotor. Design and analysis of stator, rotor and blades of axial flow compressor issn. The stator is the stationary part of a rotary system, found in electric generators, electric motors. N and s designate polarities on the inside axis faces of the magnets. The copper is a conduit for the stator winding current. In electrical engineering, electric machine is a general term for machines using electromagnetic. The rotor and stator together forms the so called active parts of the motor. A reading of infinity or high resistance indicates an opening in the excitation winding. Production management software this may sound like a broad technical word in laymans term but trust me, it isnt. Objectives the first program objective has been to obtain a detailed set of heat transfer coefficients along the midspan of a stator and a rotor in a rotating turbine stage fig. Pdf the impact of different stator and rotor slot number.
Stator definition is a stationary part in a machine in or about which a rotor revolves. The significant difference between the rotor and the stator is that the rotor is the rotating part of the motor whereas the stator is the stationary part of the motor. Magnetic equivalent circuit modeling of induction machines under stator and rotor fault conditions gennadi y. The stator then is the stationary part of the ac motor. Installing the stator and rotor after removing the old stator and rotor, offer the new stator so the output wires end up on the outside and in the 2 oclock position on triples the wire should be on the inside in the 11 oclock, position. The rotor is designed for use with a machine having a stator 12 with a plurality of stator slots 22 for accommodating stator windings 18. The construction of the stator is similar to the threephase synchronous motor, and the construction of rotor is different for the different machine. Pdf gearless generator with magnets on the stator for. Slip ring rotor construction is very much likely to the stator. Manufacturing diecast rotors can raise several problems, due to the fact that rotors must be free from asymmetries. Free 3d model of winding tools are available on rewinding one phase motor.
The rotating part of the motor is known as the rotor. Relative motion is necessary to induce the emf into the rotor to maintain the rotor s magnetic field. The 3phase set of currents, each of equal magnitude and with a phase difference of 120o, flow in the stator windings and generate a rotating. One slip ring is attached to each end of the rotating loop. The computer program was written to help explore the effects of rotor to stator rub on rotor vibrational responses. Direct current motor rotor, startor a representative dc machine was depicted in figure 0 above, with the magnetic poles clearly identified, for both the stator and the rotor figure 1 is a photograph of the same type of machine. Ac motor stator ac motor rotor university of alabama. Introduction to doublyfed induction generator for wind.
The impact of different stator and rotor slot number. In addition, the rotor circuit models the generated. The rotor, acting as the armature, rotates in the field, cutting the lines of force and producing the desired output voltage. The stator winding dc resistance of a threephase induction motor is measured by connecting a dc voltage source across two stator terminals. The production management software was created by rotors n stators. The computer program is composed of two major sub rograms. It also consists of a group of electromagnets arranged around a cylinder, with the poles facing toward the stator poles. The rotor leakage reactance, l r, and the rotor resistance r r. Emulsification in rotorstator mixers emulsion formation. I am still a beginner in this program and didnt get more into the groove. It is made up of a number of stampings, which are slotted to receive the windings fig. The armature with a threephase winding is on the stator where voltage is induced. Using advanced manufacturing technology with modern production techniques like finite machining, we maintain the rotor profile plating to ensure the design performance is always achieved.
The rotor is a moving component of an electromagnetic system in the electric motor, electric. The stator can be designed to handle various voltages, frequencies and outputs and a varying number of poles. When running, the rotor always rotates slower than the magnetic field or no torque. The slots of the rotor contains the rotor conductor or rotor. Rotor measurement and comparator tools the nov rotor measurement and comparator tools have been designed as a simple and accurate way to measure the rotor dimensions of downhole motors. Introduction to doublyfed induction generator for wind power applications 261 like the stator circuit, the rotor circuit also has two parasitic elements. The rotor is located inside the stator and is mounted on the ac motors shaft. Slip will keep the rotor s field slightly behind the stator s field.
Then, six motors with different rotor slot numbers are simulated and studied with fem. In normal operation, the stator is excited by alternating voltage. Ac motor basic stator and rotor operation diagrams. Direct current dc, from an external exciter or from a diode bridge mounted.
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