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Search results “Torque ripple in induction motor”
Anticogging: Torque ripple suppression, modeling, and parameter selection
 
05:17
More information at: http://modlabupenn.org/anticogging/ Low cost brushless direct current motors are becoming more prevalent, especially from the hobby remote control community. These motors often have the required high-torque density; however, they also have significant torque ripple. This video and accompanying paper presents a low cost method for anticogging, the compensation of cogging torque.
Views: 12129 Modlab UPenn
Mod-09 Lec-29 Analysis of torque ripple in induction motor drives - I
 
57:53
Pulse width Modulation for Power Electronic Converters by Dr. G. Narayanan,Department of Electrical Engineering,IISc Bangalore.For more details on NPTEL visit http://nptel.ac.in
Views: 5148 nptelhrd
What is TORQUE RIPPLE? What does TORQUE RIPPLE mean? TORQUE RIPPLE meaning & explanation
 
01:05
What is TORQUE RIPPLE? What does TORQUE RIPPLE mean? TORQUE RIPPLE meaning - TORQUE RIPPLE definition - TORQUE RIPPLE explanation. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. Torque ripple is an effect seen in many electric motor designs, referring to a periodic increase or decrease in output torque as the motor shaft rotates. It is measured as the difference in maximum and minimum torque over one complete revolution, generally expressed as a percentage. A common example is "cogging torque" due to slight asymmetries in the magnetic field generated by the motor windings, which causes variations in the reluctance depending on the rotor position. This effect can be reduced by careful selection of the winding layout of the motor, or through the use of realtime controls to the power delivery.
Views: 439 The Audiopedia
Mod-09 Lec-30 Analysis of torque ripple in induction motor drives - II
 
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Pulse width Modulation for Power Electronic Converters by Dr. G. Narayanan,Department of Electrical Engineering,IISc Bangalore.For more details on NPTEL visit http://nptel.ac.in
Views: 3420 nptelhrd
Torque ripple reduction of a 15 phase pole phase modulated induction motor drive
 
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Generation of multilevel voltage profile for torque ripple reduction of a 15 phase pole phase modulated induction motor drive using two level inverter structure
Views: 472 UMESH B S Umesh
Torque ripple analysis on electrical machines
 
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The torque on the rotor of an electrical machine can be systematically decomposed into source components, such as to the stator-iron-to-rotor-iron or stator-current-to-rotor-magnet components. In this video we demonstrate the approach and show different force components acting on a rotating permanent magnet motor.
Views: 1561 TUT Electromagnetics
Cogging Torque Ripple Minimization via Position Based Characterization
 
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Cogging torque ripple minimization, also known as anticogging, is a software approach to making motors smoother. This video was presented at RSS 2014. More information can be found at http://modlabupenn.org/anticogging/.
Views: 3519 Modlab UPenn
What is COGGING TORQUE? What does COGGING TORQUE mean? COGGING TORQUE meaning & explanation
 
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What is COGGING TORQUE? What does COGGING TORQUE mean? COGGING TORQUE meaning - COGGING TORQUE definition - COGGING TORQUE explanation. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. Cogging torque of electrical motors is the torque due to the interaction between the permanent magnets of the rotor and the stator slots of a Permanent Magnet (PM) machine. It is also known as detent or 'no-current' torque. This torque is position dependent and its periodicity per revolution depends on the number of magnetic poles and the number of teeth on the stator. Cogging torque is an undesirable component for the operation of such a motor. It is especially prominent at lower speeds, with the symptom of jerkiness. Cogging torque results in torque as well as speed ripple; however, at high speed the motor moment of inertia filters out the effect of cogging torque. A summary of techniques used for reducing cogging torque: 1. Skewing stator stack or magnets. 2. Using fractional slots per pole. 3. Modulating drive current waveform. 4. Optimizing the magnet pole arc or width. Almost all the techniques used against to cogging torque also reduce the motor counter-electromotive force and so reduce the resultant running torque. A slotless and coreless permanent magnet motors does not have any cogging torque. Model railway motors usually have a 2-pole permanent magnet and 3, 5 or 7 poles on the armature to reduce cogging torque.
Views: 817 The Audiopedia
Production of Torque I
 
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Until now, it is custom to discuss each electrical machine separately as if it had a unique existence. This presentation demonstrates that machines have many common features and introduces torque production in dc, synchronous and induction machines as interaction of two magneto-motive forces.
Views: 9817 Professor Essam Hamdi
Permanent Magnet Motor(no starting torque, no torque ripple, no cogging torque)
 
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This is PMG but can be AC motor We supply eletricity to test for motor. It is working with out other starting torque, no cogging torque and no torque ripple. It is very high efficiency.
Views: 8879 진준철
AC Motor Speed Torque
 
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General design B torque curve expalanation
Views: 31010 bkilbey
EMS Webinar: Minimizing cogging torque in a skewed stator BLDC motor
 
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Minimizing cogging torque in a skewed stator BLDC Motor Cogging torque is a result of the interaction between the rotor magnets and stator slotting. This unwanted component of the torque introduces ripple in the output torque, poses higher stress on the machine bearing and produces vibration. There are few methods that are used to achieve cogging torque reduction. They usually compromise motor performance in some way, leading very often to reduced winding EMF.
Views: 2581 EMWorksInc
Induction Motors, Part V:  Deriving the Speed-Torque Curve using SimPowerSystems, 12/12/2013
 
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(*links to two accompanying files below *) This is the fifth video on induction motors. It introduces the speed-torque curve of the squirrel cage induction motor (SCIM) and shows how it can be derived by using a SimPowerSystems model. The concept of pull-out torque and starting torques are discussed. the data is compiled into an MS Excel sheet and the resultant curve plotted. Link to the page that contains SimPowerSystems model and the Excel file: http://eacademic.ju.edu.jo/l.sharif/Material/Forms/AllItems.aspx?RootFolder=%2fl%2esharif%2fMaterial%2fElectrical%20Machines%20for%20Mechatronics%2f05%20Induction%20Motors&FolderCTID=&View=%7bA0E71073%2d59AD%2d4A99%2dACC6%2d800786A5413C%7d
Views: 10307 Lutfi Al-Sharif
Cogging Effect
 
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This is a Bedini/Cole type window motor before adding the coils. The rotor has 36 Neodymium magnets in a N-S-N-S-N-S 6 pole configeration. The block magnet is a ceramic two pole N-S. The interreaction between the two is called a Cogging effect. Works like large invisible gears.
Views: 67807 Glenn Pfortmiller
Torque ripple?
 
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Views: 565 imcmahon
Cogging effect in induction motor
 
05:37
https://youtu.be/nCQLGCaZ8uY अगर आप fitness और Body बनाने मे intrested है तो आप हमारे दूसरे channel को Subscribe करिये A squirrel cage Rotor main main main exhibit behaviour in starting for certain relationship between the number of pole the number of stator and rotor slots equal you are an integral multiple of rotor slots the variation of reluctance as a function of space will be quiet pronoused resulting in strong alignment force at the instant of starting. This force may create an alignment torque stronger than the accelerating torque. consequent failure of motor to start .this phenomena is known as cogging
Views: 9816 Himanshu Srivastava
Single Phase Induction Motor, How it works ?
 
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Help us to make future videos for you. Make LE's efforts sustainable. Please support us at Patreon.com ! https://www.patreon.com/LearnEngineering Working of Single phase induction motors is explained in this video with help of animation. When only single power phase is available, single phase motors are the natural choice out of wide variety of electric motors. In this video concept of double revolving field theory, main winding, auxiliary winding, and the way motor is made self start is explained in detailed way.
Views: 1170981 Learn Engineering
Design for Torque Ripple Minimization of BLDC Motor Using Direct Torque Control||BLDC motor projects
 
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We are providing a Final year IEEE project solution & Implementation with in short time. If anyone need a Details Please Contact us Mail: [email protected] Phone: 09842339884, 09688177392 Watch this also: https://www.youtube.com/channel/UCDv0caOoT8VJjnrb4WC22aw Engineering Project Consultancy, IEEE Projects for M.Tech, IEEE Projects for BE,IEEE Software Projects, IEEE Projects in Bangalore, IEEE Projects Diploma, IEEE Embedded Projects, IEEE NS2 Projects, IEEE Cloud Computing Projects, Image Processing Projects, Project Consultants in Bangalore, Project Management Consultants, Electrical Consultants, Project Report Consultants, Project Consultants For Electronics, College Project Consultants, Project Consultants For MCA, Education Consultants For PHD, Microsoft Project Consultants, Project Consultants For M Phil, Consultants Renewable Energy Project, Engineering Project Consultants, Project Consultants For M.Tech, BE Project Education Consultants, Engineering Consultants, Mechanical Engineering Project Consultants, Computer Software Project Management Consultants, Project Consultants For Electrical, Project Report Science, Project Consultants For Computer, ME Project Education Consultants, Computer Programming Consultants, Project Consultants For Bsc, Computer Consultants, Mechanical Consultants, BCA live projects institutes in Bangalore, B.Tech live projects institutes in Bangalore,MCA Live Final Year Projects Institutes in Bangalore,M.Tech Final Year Projects Institutes in Bangalore,B.E Final Year Projects Institutes in Bangalore , M.E Final Year Projects Institutes in Bangalore,Live Projects,Academic Projects, IEEE Projects, Final year Diploma, B.E, M.Tech,M.S BCA, MCA Do it yourself projects, project assistance with project report and PPT, Real time projects, Academic project guidance Bengaluru,projects at Bangalore, Bangalore at projects,Vlsi projects at Bangalore, Matlab projects at Bangalore, power electronics projects at Bangalore,ns2 projects at Bangalore,ns3 project at Bangalore, Engineering Project Consultants bangalore, Engineering projects jobs Bangalore, Academic Project Guidance for Electronics, Free Synopsis, Latest project synopsiss ,recent ieee projects ,recent engineering projects ,innovative projects. ieee matlab ac to dc projects,ieee matlab dc to dc projects,ieee matlab pid projects,ieee matlab PI projects,ieee matlab fuzzy controller projects,ieee matlab ANFIS projects,ieee fuzzy logic projects,ieee projects converters projects,ieee projects inverter projects,ieee matlab sepic converter projects,ieee matlab buck converter projects,ieee matlab cuk converter,ieee matlab fuzzy logic projects,ieee matlab multilevel converter projects,ieee matlab 14 bus projects,ieee matlab genetic algorithm projects,ieee matlab 7 bus projects,ieee matlab nine bus projects,ieee matlab switching capacitor projects,ieee matlab renewable energy projects,ieee matlab grid based projects,ieee matlab smart grid projects, ieee matlab inverter projects,ieee matlab cascaded projects,ieee matlab recent projects||Speed Control of BLDC Motor Drive under Direct Torque Control Scheme with Modified Integrator||Brushless DC Motor, Direct Torque Control, Space Vector Pulse-width Modulation, Torque ripple||sub-block to calculate the Current and Flux||simulation model of Direct torque control based BLDC||Direct torque control||torque ripple minimization of BLDC motor||Brushless DC (BLDC) motor, Direct TorqueControl (DTC), permanent magnet motor, PI Controller, fast dynamic response||Block schematic of DTC based speed control of BLOC motor Drive
Exploring cogging torque
 
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Having a quick look at cogging torque, measuring it and looking at it's effects at speed
Views: 612 SiieeFPV
Switched reluctance motor-switched reluctance motor operation-working of switched reluctance motor
 
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Switched reluctance motor- The switched reluctance motor (SRM) is a type of stepper motor, an electric motor that runs by reluctance torque. Unlike common DC motor types, power is delivered to windings in the stator (case) rather than the rotor. This greatly simplifies mechanical design as power does not have to be delivered to a moving part, but it complicates the electrical design as some sort of switching system needs to be used to deliver power to the different windings. With modern electronic devices, precisely timed switching is not a problem, and the SRM is a popular design for modern stepper motors. Its main drawback is torque ripple. However, controller technology that limits torque ripple at low speeds has been demonstrated.[1] An alternate use of the same mechanical design is as a generator when driven mechanically, and the load is switched to the coils in sequence to synchronize the current flow with the rotation. Such generators can be run at much higher speeds than conventional types as the armature can be made as one piece of magnetisable material, a simple slotted cylinder.[2] In this case use of the abbreviation SRM is extended to mean Switched Reluctance Machine, although SRG, Switched Reluctance Generator is also used. A topology that is both motor and generator is useful for starting the prime mover, as it saves a dedicated starter motor. Operating principle- The SRM has wound field coils as in a DC motor for the stator windings. The rotor however has no magnets or coils attached. It is a solid salient-pole rotor (having projecting magnetic poles) made of soft magnetic material (often laminated-steel). When power is applied to the stator windings, the rotor's magnetic reluctance creates a force that attempts to align the rotor pole with the nearest stator pole. In order to maintain rotation, an electronic control system switches on the windings of successive stator poles in sequence so that the magnetic field of the stator "leads" the rotor pole, pulling it forward. Rather than using a troublesome high-maintenance mechanical commutator to switch the winding current as in traditional motors, the switched-reluctance motor uses an electronic position sensor to determine the angle of the rotor shaft and solid state electronics to switch the stator windings, which also offers the opportunity for dynamic control of pulse timing and shaping. This differs from the apparently similar induction motor which also has windings that are energised in a rotating phased sequence, in that the magnetization of the rotor is static (a salient pole that is made 'North' remains so as the motor rotates) while an induction motor has slip, and rotates at slightly less than synchronous speed. This absence of slip makes it possible to know the rotor position exactly, and the motor can be stepped arbitrarily slowly. switched reluctance motor, switched reluctance motor working animation, switched reluctance motor animation, switched reluctance motor working principle, switched reluctance motor youtube, switched reluctance motor basics, switched reluctance motor how it works, switched reluctance motor learn engineering, switched reluctance motor operation, working of switched reluctance motor, switched reluctance motor video, switched reluctance motor working -~-~~-~~~-~~-~- Please watch: "Introduction of Instrument Transformers | Instrument Transformers" https://www.youtube.com/watch?v=lWUljK0YLsY -~-~~-~~~-~~-~-
DIRECT TORQUE CONTROL OF INDUCTION MOTOR USING SPACE VECTOR MODULATION (SVM) 2ND PPT
 
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DIRECT TORQUE CONTROL OF INDUCTION MOTOR USING SPACE VECTOR MODULATION (SVM)
Views: 2744 Vinod Kumar
Harmonics in Generated EMF [Year - 3]
 
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Watch this video to learn about the causes of distortion in EMF generated by an alternator and about harmonics and its source. Department: Electrical Engineering Subject: Electrical Machines - III Year: 3
Views: 16132 Mobile Tutor
DIRECT TORQUE CONTROL OF INDUCTION MOTOR USING SVPWM
 
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Direct torque control (DTC) is one of the most excellent control strategies of torque control in induction motor. The aim is to control effectively the torque and flux. Torque control of an induction motor (IM) based on DTC strategy will be developed and a comprehensive study will be made in this project. Direct torque control is the first technology to control the real motor control variables of torque and flux. This method makes the rotor more accurate and fast control, high dynamic speed response and simple to control. The reference value can be calculated using the flux and torque estimation and also motor parameters.With the Joint progress of the power electronics and numerical electronics it is possible today to deal with the axis control with variable speed in low power applications. With these technological projections, various command approaches have been developed by the scientific community to master in real time, the flux and the torque of the electrical machines, the direct torque control (DTC) scheme being one of the most recent steps in this direction. This scheme provides excellent properties of regulation without rotational speed feedback. In this control scheme the electromagnetic torque and stator flux magnitude are estimated with only stator voltages and currents and this estimation does not depend on motor parameters except for the stator resistance.
Views: 15268 Vinod Kumar
stepper motor 3.3Hz torque ripple
 
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stepper motor torque ripple sympathetic to the 3.3Hz mount frequency
Views: 722 astrolopitec
magnetic cogging
 
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I discovered something simple: the magnetic center with permanent magnets is off ! This is one of the reasons my mendocino starts cogging at a certain frequency. I don't know this for other than cylindrical magnets but it can explain my problem with the mendocino. maybe someone knows more about this? please let me know.
Views: 7412 sMartcreations2010
BLDC cogging torque
 
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new experiments https://www.youtube.com/playlist?list=PLGAApvX09JYpDTTxzb9WJnsZ6pIKEoGI9 this video shows the open loop control of BLDC, (sensors was not used) DDS was used to generate rotation of "virtual" rotor, then this angle with constant power was used in inverse Park transformation, after that SVPWM was used to generate stator currents. two different constant power was applied, 20% at begging, and 100% at 0:20 with 20% of power cogging-torque was visible, with 100% it is not visible, but the motor is heated BLDC cogging torque is the pulsating torque component produced by the variation of the air-gap permeance or reluctance of the stator teeth and slots above the magnets as the rotor rotates. No stator excitation is involved in cogging torque production. More info about this construction in description for this video https://www.youtube.com/watch?v=HtvWJJolB9s&list=PLGAApvX09JYpDTTxzb9WJnsZ6pIKEoGI9&index=8 New successful results with cogging compensation on this video (and newer) https://www.youtube.com/watch?v=hLeS3XZbM8A&index=3&list=PLGAApvX09JYpDTTxzb9WJnsZ6pIKEoGI9
Views: 7041 linvinus
Cogging torque
 
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Views: 2344 prosimrnd
Empathy: innovative configuration of permanent magnet electrical motor
 
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EMPATHY is an innovative configuration of permanent magnet electrical motor, based on the evolution of the FSPM (Flux Switching Permanent Magnet) architecture, enabling to limit torque ripple which traditionally affects such a configuration, being also characterized by high efficiency and high power and torque value.
Views: 8624 LaborSrl
Induction Motor vs Synchronous Motor│ Difference between Synchronous and Induction Motor│
 
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Induction Motor vs Synchronous Motor│ Difference between Synchronous and Induction Motor│ Hi everybody, today I will share about induction motor vs synchronous motor. AC motors can be divided into two main categories - (i) Synchronous motor and (ii) Asynchronous motor. An asynchronous motor is popularly called as Induction motor. Both the types are quite different from each other. Major differences between a synchronous motor and an induction motor are discussed below. More videos:- DC Motor vs Stepper Motor - Difference between DC Motor and Stepper Motor https://www.youtube.com/watch?v=VnWnkYrHTIc Types of DC Motors - Classification of DC Motors https://www.youtube.com/watch?v=uth3248pzqM More information about the DC motor, so visit us our web site www.learningengnr.com Please visit my site: www.learningengnr.com/ Please visit our Blog: https://learningengineering1994.blogspot.com/ Connect with me in my social page: https://www.facebook.com/Learning.Engring/ Subscribe my youtube channel: https://www.youtube.com/c/learningengineering/ Find us On Pinterest: https://www.pinterest.com/konok13/learning-engineering/ Find us On Google+: https://plus.google.com/u/0/+LearningEngineering Find us On Twitter: https://twitter.com/konokkamruzzam Find us On Linkedin : https://www.linkedin.com/in/konok-kamruzzaman-135169137/
Views: 390843 Learning Engineering
Synchronisation of electric motor in start
 
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The video shows two components of the torque in start. The first component is the torque created by the stator to the rotor steel core, and the other component is torque between the stator and the rotor cage.
What Is Cogging In Motor?
 
00:30
"What Is Cogging In Motor? Watch more videos for more knowledge What Is Cogging In Motor? - YouTube https://www.youtube.com/watch/8YOu_Czv4HA Cogging and Crawling of Induction Motor - YouTube https://www.youtube.com/watch/kPO6nr_Snfw Cogging Effect - YouTube https://www.youtube.com/watch/568Qe5JQs-0 Cogging Crawling effect in a 3-Phase Induction ... https://www.youtube.com/watch/pYa5VOaQHyo Crawling and Cogging of Induction Motor YouTube ... https://www.youtube.com/watch/HjpUFKCQi0A What Is Cogging And Crawling Of An Induction ... https://www.youtube.com/watch/yAKU6MAcwWw Crowling and Cogging of induction motor in hindi ... https://www.youtube.com/watch/LCK063edDSQ Cogging effect in induction motor - YouTube https://www.youtube.com/watch/I6pcW-ZELyQ Crawing and Cogging in Induction Motor - YouTube https://www.youtube.com/watch/QvHVBwlfxaw Cogging torque - YouTube https://www.youtube.com/watch/yT04YrPViwE What is COGGING TORQUE? What does COGGING ... https://www.youtube.com/watch/PqMOVrwInqM What Is Cogging In Induction Motor? - YouTube https://www.youtube.com/watch/2uL_EfPsTDI Cogging Effect - YouTube https://www.youtube.com/watch/_QLkJ2Kh5cI Cogging | Magnetic Locking || Latest Update 2018 ... https://www.youtube.com/watch/kkZmSFxFZhU What is meant by Crawling in the Induction Motor ... https://www.youtube.com/watch/dLotJ2xRPis What Is Crawling In An Induction Motor? - YouTube https://www.youtube.com/watch/FGiGAO5w1BM Crawling and Cogging in induction motor and ... https://www.youtube.com/watch/tHEFodq8dqM Zero Cogging Slotless Motor Design - InFranor ... https://www.youtube.com/watch/dWlu61XEcQs Vibrac Torque Inspector 2 - Motor Cogging Torque ... https://www.youtube.com/watch/JZFDfbvZiE4 Infamous X5 Motor Cogging. - YouTube https://www.youtube.com/watch/qI46Y0HIuaM"
Views: 95 Ask Question II
PART3: SIMULATION DIRECT TORQUE AND FLUX CONTROL OF INDUCTION MOTOR/ĐIỀU KHIỂN TRỰC TIẾP MOMEN DTC
 
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Dear everybody! If you find this channel useful, please support the channel by sending money back to my paypal account [email protected] Thank you very much.
Views: 2911 vn Journal
Induction Motors Part 2
 
01:06:40
This is the second part of my induction motors lecture.
Views: 766 Frank Ferrese
Zero Cogging Slotless Motor Design - InFranor XtraFors Prime PF00
 
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A slottles motor design will have new zero torque ripple. i.e. no variation in torque over electrical cycle position. I was able to tune to an incredible +/-1 count following error at speed. Wow! Besides an increase in torque density this Infranor XtraFors Prime motor can hit incredibly high speed of up to 30krpm without filing the magnets off. I also found that they use Quantum Devices encoders that offer 1250 line SIN COS with our 4096 *4 interpolation that's 20,480,000 counts/rev... great for tracking space objects.
Views: 292 Dean Crumlish
Harmonics and Torque Ripple Minimization using L-C Filter for Brushless DC Motors.wmv
 
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Harmonics and Torque Ripple Minimization using L-C Filter for Brushless DC Motors
Views: 2006 VERILOG COURSE TEAM
PART2: SIMULATION DIRECT TORQUE AND FLUX CONTROL OF INDUCTION MOTOR/ĐIỀU KHIỂN TRỰC TIẾP MOMEN DTC
 
11:59
Dear everybody! If you find this channel useful, please support the channel by sending money back to my paypal account [email protected] Thank you very much.
Views: 3654 vn Journal
PART5: SIMULATION DIRECT TORQUE AND FLUX CONTROL OF INDUCTION MOTOR/ĐIỀU KHIỂN TRỰC TIẾP MOMEN DTC
 
18:09
Dear everybody! If you find this channel useful, please support the channel by sending money back to my paypal account [email protected] Thank you very much.
Views: 4686 vn Journal
Switched Reluctance Motor Drives - Short Course
 
05:18
receive an introduction to SRM motors, their classifications and the following: analysis design applications Designed for engineers specializing in drives technology and the end users who utilize the many aspects of its application. Limited seats available. Visit www.vtrc.vt.edu/motordrives to reserve your seat.
Views: 271 VTRC
Motor Drive Applications
 
03:04
In this video is an example of a 48 V, 10 A 3-phase GaN Inverter reference design from Texas Instruments using an LMG5200. A GaN solution has better thermal profiles where heat sinks can be eliminated and lower inductance reduces size and weight. Also reduced losses and torque ripple results in a more precise motor control. This reference design has an incredible efficiency rating of 98.5%!
Views: 751 EPC Corporation
What is SWITCHED RELUCTANCE MOTOR? What does SWITCHED RELUCTANCE MOTOR mean?
 
06:34
✪✪✪✪✪ WORK FROM HOME! Looking for US WORKERS for simple Internet data entry JOBS. $15-20 per hour. SIGN UP here - http://jobs.theaudiopedia.com ✪✪✪✪✪ ✪✪✪✪✪ The Audiopedia Android application, INSTALL NOW - https://play.google.com/store/apps/details?id=com.wTheAudiopedia_8069473 ✪✪✪✪✪ What is SWITCHED RELUCTANCE MOTOR? What does SWITCHED RELUCTANCE MOTOR mean? SWITCHED RELUCTANCE MOTOR definition - SWITCHED RELUCTANCE MOTOR explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. The switched reluctance motor (SRM) is a type of a stepper motor, an electric motor that runs by reluctance torque. Unlike common DC motor types, power is delivered to windings in the stator (case) rather than the rotor. This greatly simplifies mechanical design as power does not have to be delivered to a moving part, but it complicates the electrical design as some sort of switching system needs to be used to deliver power to the different windings. With modern electronic devices, precisely timed switching is not a problem, and the SRM is a popular design for modern stepper motors. Its main drawback is torque ripple. An alternate use of the same mechanical design is as a generator when driven mechanically, and the load is switched to the coils in sequence to synchronize the current flow with the rotation. Such generators can be run at much higher speeds than conventional types as the armature can be made as one piece of magnetisable material, a simple slotted cylinder. In this case use of the abbreviation SRM is extended to mean Switched Reluctance Machine, although SRG, Switched Reluctance Generator is also used. A topology that is both motor and generator is useful for starting the prime mover, as it saves a dedicated starter motor. The SRM has wound field coils as in a DC motor for the stator windings. The rotor however has no magnets or coils attached. It is a solid salient-pole rotor (having projecting magnetic poles) made of soft magnetic material (often laminated-steel). When power is applied to the stator windings, the rotor's magnetic reluctance creates a force that attempts to align the rotor pole with the nearest stator pole. In order to maintain rotation, an electronic control system switches on the windings of successive stator poles in sequence so that the magnetic field of the stator "leads" the rotor pole, pulling it forward. Rather than using a troublesome high-maintenance mechanical commutator to switch the winding current as in traditional motors, the switched-reluctance motor uses an electronic position sensor to determine the angle of the rotor shaft and solid state electronics to switch the stator windings, which also offers the opportunity for dynamic control of pulse timing and shaping. This differs from the apparently similar induction motor which also has windings that are energised in a rotating phased sequence, in that the magnetization of the rotor is static (a salient pole that is made 'North' remains so as the motor rotates) while an induction motor has slip, and rotates at slightly less than synchronous speed. This absence of slip makes it possible to know the rotor position exactly, and the motor can be stepped arbitrarily slowly. If the poles A0 and A1 are energised then the rotor will align itself with these poles. Once this has occurred it is possible for the stator poles to be de-energised before the stator poles of B0 and B1 are energized. The rotor is now positioned at the stator poles b. This sequence continues through c before arriving back at the start. This sequence can also be reversed to achieve motion in the opposite direction. This sequence can be found to be unstable while in operation, under high load, or high acceleration or deceleration, a step can be missed, and the rotor jumps to wrong angle, perhaps going back one instead of forward three. A much more stable system can be found by using the following "quadrature" sequence. First, stator poles A0 and A1 are energized. Then stator poles of B0 and B1 are energized which pulls the rotor so that it is aligned in between the stator poles of A and B. Following this the stator poles of A are de-energized and the rotor continues on to be aligned with the stator poles of B, this sequence continues through BC, C and CA before a full rotation has occurred. This sequence can also be reversed to achieve motion in the opposite direction. As at any time two coils are energised, and there are more steps between positions with identical magnetisation, so the onset of missed steps occurs at higher speeds or loads.
Views: 14864 The Audiopedia
Lecture   34 Induction Motor Drives
 
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Lecture Series on Industrial Automation and Control by Prof. S. Mukhopadhyay, Dept.of Electrical Engineering, IIT Kharagpur
PART1: SIMULATION DIRECT TORQUE AND FLUX CONTROL OF INDUCTION MOTOR/ĐIỀU KHIỂN TRỰC TIẾP MOMEN DTC
 
12:49
Dear everybody! If you find this channel useful, please support the channel by sending money back to my paypal account [email protected] Thank you very much.
Views: 3495 vn Journal
IEEE 2017-2018 POWER ELECTRONICS COMMUTATION TORQUE RIPPLE REDUCTION IN BLDC MOTOR USING MODIFIED SE
 
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