A hybrid control study of bearingless induction motor. The purpose of this paper is to choose a new topology for bearingless fluxswitching slice motors, regarding the number of stator and rotor poles, with a combined winding set. The technology uses the same stator windingscoils and can use a standard variable speed drive for operation. The bearingless motor combined technical characteristics of motor and magnetic bearings. Load disturbance rejection control of a bearingless induction motor. The bearingless induction motor blim is a multivariable, nonlinear. Overview of bearingless induction motors topic of research paper. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust.
A 3 phase induction motor can be used for different applications with various speed and load requirements. Introduction i n recent years, there is an increasing interest in bearingless motors around the world. An identification method of suspension force and magnetic unbalance pull force parameters in buriedtype ipm bearingless motors. A control system for an electromagnetic rotary drive for bearingless motor generators comprises a winding configuration comprising a plurality of individual pole pairs through which phase current flows, each phase current producing both a lateral force and a torque. The bearingless induction motor bim integrates motor rotation and suspended function. The ac induction motor is the most used electrical motor in industrial applications worldwide. Bearingless motors were introduced in the early 1990 1. Sizes vary from fractional horsepower to several thousand horsepower used for such appli. The model of the motor may, but need not be an accurate representation of the construction of electric motor. A bearingless coaxial magnetic gearbox sciencedirect. The conventional im is used as a bearingless motor for artificiallift oil proposes, allowing a reduction in maintenance and operation costs. Displacement sensorless control for bearingless induction. Determination of the losses in induction machines due to harmonics pdf. This paper shows the analysis and study of a bearingless ac motor type divided winding for a conventional squirrel cage induction motor, im.
Based on this, the radial displacement sensorless control system of a bearingless induction motor is constructed. Ac induction motors are also the most common motors used in main powered home appliances. Diaplacement sensorless control strategy of bearingless. Electric energy and induction motors the level of prosperity of a community is related to its capability to produce goods and services. Digital control system design and analyses of a 3phase. At the same time, the reversibility of the mathematical model is analyzed.
Bearingless induction motors combining functions of both torque generation and noncontact magnetic suspension together have attracted more and. Second, the inverse model of 5degreeof free dom bearingless induction motor is identified using the regress capability for highdimensional nonlinear least. This paper attempts to solve this problem by using a combined analytical method and finite element analysis method fem. Shuttle plug threads may have light coat of oil or preservative. Speedsensorless vector control of a bearingless induction. Eccentricity detection is an important topic in motor fault diagnosis and bearingless motor controls.
Pdf overview of bearingless induction motors researchgate. In turn, a current is produced in the rotor bars and shorting ring and another magnetic field is. The threephase induction motor is the extensively used for various kinds of industrial drives. The electric energy generated purchased by consumers for different needs. A bearingless switchedreluctance motor for high specific power applications benjamin b. Sliding mode variable structure control of a bearingless. A bearingless induction motor system that uses standard windings is proposed. An induction motor or asynchronous motor is an ac electric motor in which the electric current. The derived model and the proposed controller design are verified by experiments with a hybrid hysteresis induction type bearingless motor. For motors falling outside this description, the more comprehensive model specifications below are recommended. Firstly, the l 1 norm of state variables is applied to the conventional exponential reaching law and an.
An accurate mathematical model of radial suspension force for the singlewinding bearingless induction motor is deduced based on the principle of radial suspension force in traditional bim. A key feature that distinguishes bearingless motor technology is that it combines both the motor and magnetic bearing in the same unit. A motor generator comprises a stator, a rotor supported for movement relative to the stator, and a control system. Pdf robust speed control of a bearingless ac motor type. The magnetic gearbox is a recent technology that offers many advantages over conventional mechanical gearboxes including reduced maintenance and improved reliability, lack of lubrication requirements, precise peak torque transmission, inherent overload protection, physically isolated input and output shafts, misalignment tolerance, and low acoustic noise. Simulation results have shown that when the presented displacement estimation method is adopted, quicker tracking speed and higher tracking accuracy of radial displacement can be obtained. Article information, pdf download for load disturbance rejection. Since there are two sets of windings wound on the stator of bearingless motor, two sets of power circuit hardware and controller are required.
The first commutatorfree single phase ac induction motor was invented by hungarian engineer otto blathy. The main difference in the structure of bearingless induction machines is in the rotor used. Model repair specifications for low voltage induction motors these model repair specifications are intended to cover routine repair and rewind of lowvoltage randomwound threephase ac squirrel cage induction motors. In order to improve the performance of the bearingless induction motor bim under large disturbances such as parameter variations and load disturbances, an adaptive variablerated sliding mode controller asmc is designed to obtain better performance of the speed regulation system. Article information, pdf download for neural network inverse system.
A bearingless induction bi motor with an outer rotor for flywheel energy storage systems is proposed due to the perceived advantages of simple rotor structure. The rotor is biased with a homopolar permanentmagnetic flux, on which 2pole flux can be superimposed to generate. Pdf analyses of a bearingless three phase induction machine. Induction motor 1 chapter 3 induction motor bee23 electrical machine power system 2 learning outcomes. Description quantity 1 5986560001 end cap assembly 151612 oring ports 2 1.
Modeling of bearingless permanent magnet synchronous motor. In 3, 4, bearingless motor optimization of permanent magnet and induction motors shows that with a combined winding, less than 2. It has a series of better characteristics than the conventional motor, such as no friction, no loss, no lubrication, longer service life, high speed and high precision. Model repair specifications for low voltage induction motors.
Pdf reluctance force magnetic suspension characteristics. Pdf on sep 30, 2014, luciano p s junior and others published robust speed control of a bearingless ac motor type divided. A motor rating of 10 horse power, 415 volts with 1440 rpm and 4pole is selected for design problem and an equivalent circuit model is developed to find out the various. Neural network inverse system decoupling control strategy of blim. Homopolar bearingless slice motor in temple design conferences. Bearingless induction motors combining functions of both torque generation and noncontact magnetic suspension together have attracted more and more. This work is introducing the designing of new three phase squirrel cage induction motor with an objective of getting good efficiency. Integrated solutions that leverage the motor s magnetic field to create magnetic bearing forces on the shaft eliminate the need for radial bearings and source of friction, energy losses and oil migration. Designing of three phase squirrel cage induction motor for. This controller can maintain rotor flux orientation of bearingless induction motor bim driven by indirect. It has a series of better characteristics than the conventional motor, such as no friction, no loss, no lubrication, longer service life, high speed and high precision running.
Development of a high speed solid rotor asynchronous drive fed. The reactive powerbased model reference adaptive controller mrac is presented in this paper in detail to estimate rotor resistance online. Eccentricity detection of a sixphase induction motor with hfi. Keywords bearingless induction motor, fractional order, sliding mode. Eaton charlynn vis 45 series bearingless motors parts and repair manual cmolotm006e march 2008 3 vis bearingless motors 45 series parts list ref. Firstly, the l 1 norm of state variables is applied to the conventional exponential. In the process of motor rotation, the vibration caused by the rotor mass eccentricity seriously affects the dynamic characteristics and safety operation of system. The theory used in the work was collected by studying literature on how electrical motors work, and by simplifying the. Converts the windings current in the xy coordinate system to e q d coordinate system, as shown in equation 9. Motion and temperature heat control are paramount in energy. Eaton charlynn vis bearingless motors cmolotm003e march 2008 5 vis bearingless motors 30 series reassembly 7. At the end of the lecture, student should be able to. Rotor mass eccentricity vibration compensation control in.
Other motors that are included are 1phase induction motors, permanent synchronous motors and synchronous reluctance motors. Bearingless motors lcm linz center of mechatronics. So rotor mass eccentricity vibration compensation control on rotating machine has great significance, especially for the high speed bearing less induction motor bim. The bearingless induction motor is a new type of motor with high performance that utilizes the maxwell force generated by the two sets of windings in the stator of the motor to suspend the rotor 15. A bearingless induction motor bim is a new type of motor with noncontact rotor suspension and negligible friction loss. Perform an analysis on induction machines which is the most rugged and the most. Induction motors are the commonest type of motor and account for a very large proportion of heavy duty motors. Bearingless induction motor is a complex system of inductances, so in order to model this system we must formulate the equilibrium equations of electrical and mechanical. Choi national aeronautics and space administration glenn research center cleveland, ohio 445 mark siebert university of toledo toledo, ohio 43606 a 128 switchedreluctance motor ref. Bearingless slice drives feature a magneticallysuspended rotor disk. Rewinding of motors pdf the information in this report and the good practice guide to maintain motor efficiency part 2 was. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext.
Analysis and study of a bearingless ac motor type divided. One major imperfection of this motor is that its performance highly depends on the rotor slot width. Install one shuttle valve threaded internal hex plug with oring. This paper overviews the key technologies of the bearingless induction motors. The derived mathematical model provides an effective basis for loopshaping control design for the reluctance forcebased magnetic suspension systems in bearingless motors. Typical induction motor rotors the magnetic field generated in the stator induces an emf in the rotor bars. Bearingless induction motors combining functions of both torque generation and noncontact magnetic suspension together have attracted more and more attention in the past decades due to their. Relationship between reference and current vectors. Design of a bearingless outer rotor induction motor.
The rotor and stator are separated by an air gap which allows free rotation of the rotor. Study on radial suspension force of single winding. Because of the incomparable advantages of the small size, low cost, no friction and high power, and low energy consumption, the wide application and important. On a bearingless linear motor capable of selfmagnetic levitation wooyeon kim1, seungjong kim1, jongmin lee 1, sungchong chung2 and sang jo kim3 1energy mechanics research center, kist, 391 hawolgok, seongbukgu, seoul, 6791, korea. Analysis of rotor slot width influence on a bearingless. Understand the principle and the nature of single phase and 3 phase induction machines. How an induction motor works by equations and physics.
A bearingless switchedreluctance motor for high specific. But producing goods and services is strongly related to the use of energy in an intelligent way. Research on levitationrotation starting control system of bearingless induction motor 257. Based on a digital signal processor complementary metaloxide semiconductor chip, the digital control hardware and software systems are analyzed and designed. How an induction motor works by equations and physics introduction. Due to the similarity of structure between electric motors 4, 5 and magnetic bearings 6, a bearingless motor combine the functions of a motor.
In this paper, the calculation and regulation of the motor rotational speed, correction and. It can simultaneously implemented electromagnet torque control and suspension control all in the motor. The bearingless slice motor levitates and rotates a ringshaped rotor made of a semihard magnetic material. Iron free disc type eightpole pmbm with inner threephase stator and. In this study, a novel method is proposed for eccentricity detection of a sixphase motor based on highfrequency injection hfi. Bearingless induction motors combining functions of both torque generation and noncontact magnetic suspension together have attracted more and more attention in the past decades due to their definite advantages of compactness, simple structure, less maintenance, no wear particles, high rotational speed, and so forth. Optimal design of the bearingless induction motor for. Additionally, the selected motor topology is optimized with finite element method fem simulations to improve the performance.
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