Crosssection of the fourphase 86 poles switched reluctance motor srm. This paper describes a matlabsimulink environment to simulate a 64switched reluctance motor. Moreover, the lsrmhasasimplestructure thatissturdy, reliable,andlowcost. Abstractin this study, a buck converter and a driver has been designed for linear switched reluctance motor. If linear movement is required the proposed rotary linear motor will work similarly to a linear srm. Linear switched reluctance machines are the counterpart of the rotary switched reluctance machine srm, and now they have aroused great interest in the field of electrical machines and drives. They are attractive because they only have concentrate windings on the stator or translator, they are ruggedly constructed and they have low expected manufacturing costs and a high fault tolerance 1. Jan 28, 2019 this chapter deals with linear switched reluctance machines lsrms. Andrada, member, ieee abstractthis paper presents a detailed sensitivity analysis of the effect of several geometrical parameters on the performance of a doublesided linear switched reluctance motor lsrm. Keywords linear switched reluctance motor, fea, dsp i.
Analysis of performance of singlephase reluctance linear motor. Prototype model of maglev train using linear reluctance motor free download as powerpoint presentation. Reluctance torque an overview sciencedirect topics. Indeed, the position oscillations can harm some applications requiring high position precision. The paper describes the development of a novel, high performance, directdrive rotary linear motion system. Prototype model of maglev train using linear reluctance motor. Linear hybrid reluctance motor with high density force mdpi. In 7, four longitudinal lsrm configurations are presented and designed to operate as propulsion actuators in a vertical elevator prototype. The parameters like magnetic forces, magnetic flux.
Simulation of linear switched reluctance motor drives. Switching strategy of the inverter for synchronous reluctance motor some researchers proposed the switching strategies of the inverter for synchronous reluctance motors. On the motor, built according to the described motor design, the measurements of the moving force were performed in order to verify the calculated values. Abstractthis paper presents the application of linear switched reluctance motors lsrms to precision position control. Expired fee related, expires 20240827 application number us10726,420 other versions. Currently linear motion is achieved mostly by the combination of rotary motor and mechanical translators such as gears and belts. In this study, the working principles of a linear switched reluctance motor lsrm are demonstrated through the design and implementation of a linear switched reluctance motor with its appropriate control system.
However, because srm construction with doubly salient poles and its non linear magnetic characteristics, the problems of acoustic noise and torque ripple are more severe than these of other traditional motors. In this work we study a planner longitudinal linear switched reluctance motor with an active mover and a passive stator which is composed by four phases. Phase reluctance linear motor a thesis submitted to the graduate faculty of the louisiana state university and agricultural and mechanical college in partial fulfillment of the requirements for the degree of master of science in electrical engineering in the department of electrical engineering by subhadra devi ganti b. Nonlinear speed control of switched reluctance motor. Physical modeling of switched reluctance motors using modelica y. Pdf the switched reluctance motor has doublysalient pole structure which is mainly a reason for its magnetic saturation and non linear behaviour find, read and cite all the research. Physical modeling of switched reluctance motors using modelica. Simulation of a 64 switched reluctance motor based on. Upon the required direction of movement almost all the phases of a stator stack will be fed. The model is a doublesided construction where the primary member is surrounded by a set of. Owing to their frugal design, robust built and high force density, the linear switched reluctance motors lsrm has had significant stages of. Hybrid linear stepper motors operation and applications. Linear switched reluctance motor configuration and modelling the proposed actuator is a single sided linear switched reluctance motor composed by a toothed sliding part on a rail namely mover translator and a plurality of stator modules regularly distributed namely stator, figure 1.
Pdf design, modeling and analysis of linear switched. The invention consists on a linear switched reluctance electrical machine that may be operated indistinctly as a generator or a motor, with a series of characteristics that allow the optimization of the mass to power ratio, as well as the manufacturing cost. In energy method, it is necessary to calculate the. This study provide a presentation of modelling and proposes a study on open and closed loop controls for the studied motor. Pdf ropeless elevator with linear switched reluctance. Design of linear switched reluctance motor driver for. It generates torque through magnetic reluctance reluctance motor subtypes include synchronous, variable, switched and variable stepping. Application of linear switched reluctance motors to precision. Design of a modified structure linear switched reluctance. The motor windings are supplied by the current from the bridge power supply. Instantaneous thrust control of linear switched reluctance. The paper focuses on merely demonstrating the working principles of the lsrm, and consequently does not focus on a specific application.
Permanent magnet linear synchronous motor the secondary part can be in a form of permanent magnet as shown in fig. The backlash of ballscrew would degrade the accuracy and the rigidity of the system. Finite element methods, force, linear motors, reluctance motors. This thesis investigates a novel topology in which a linear switched reluctance machine lsrm propulsion drive is incorporated in the magnetically levitated and guided vehicle. The lsrm is a new kind of linear traction motor that has been developed based on the study of the switched reluctance motor srm 3 and combines the advantages of the srm and the traditional linear motor 4. Bals abstractthis paper presents a novel modelica library for physical modeling of switched reluctance machines. The motors magnetic analysis was done as a 3 dimensional model. Sensitivity analysis of geometrical parameters on a double. The synchronous reluctance motor in the section, the synchronous reluctance motor is described. Practically it is an efficient combination of a usual rotational srm and a special linear srm having several rotor stacks in its mover. A brief analysis of a bearingless linear switched reluctance.
Index terms linear switched reluctance motor, linear. Control of linear switched reluctance motor for sliding door. Pdf modular linear transverse flux reluctance motors dan. This paper deals with the modelling and control of a single sided linear switched reluctance actuator. For, example, size 11 mean the mounting face of the motor is 1. Us8269378b2 switched reluctance linear motorgenerator. Tubular linear reluctance motor with open magnetic system when the plunger placed in the centre of the coil fig. From the proposed model, its dynamic behavior is described and discussed in detail. From its linear model to the non linear model, its dynamics is described and discussed in detail. Motor was controlled more accurate with linear incremental encoder by sensing acceleration and movement direction of door. The aspects related to the functioning in fault conditions are presented. However, linear motors are not necessarily straight.
Linear switched reluctance motor lsrm is a type of direct drive motors. This paper presents a position sensorless closed loop control of a switched reluctance linear motor. Magnetic circuit analysis of a linear switched reluctance. The rotor has salient poles and a cage so that it starts like an induction motor, and runs like a synchronous motor. Introducing linear switched reluctance motor with segmental translator as a new type of lsrm, performance principles and design criteria are presented for two various topologies of this motor. A rotarylinear switched reluctance motor for advanced. The model is based on lumped parameters and it takes into account the leakage pole flux and the end effects. The topology of power circuit is shown in figure 2. The paper describes a novel, high performance, directdriven rotary linear motion system. Unlike common brushed dc motor types, power is delivered to windings in the stator case rather than the rotor. The switched reluctance motor srm is an electric motor that runs by reluctance torque. The design and mathematical modeling of a linear switched reluctance motor suitable for ground transit applications is presented in this paper.
Application of linear switched reluctance motors to. In this way, the capability of the srm to produce the expected four times the specific output torque due to operation in high saturation region compared to an equivalent induction motor as special the attribute of the srm is demonstrated. Oct 31, 2020 linear induction motors and linear synchronous motors are widely used in the propulsion systems of these transports. Force ripple and jerk minimisation in double sided linear.
Design and implementation of a linear motor for multicar. Us8729745b2 multiplephase linear switched reluctance. Design and implementation of a small scale linear switched. Analytical design of a synchronous reluctance motor srm. The mover stack will be aligned upon the variable reluctance principle with that stator poles 4. The lumped parameter magnetic analysis proposed can be a useful tool for designing linear switched reluctance machines. The motor could not perform very accurate and high speed motion as expected. Linear switched reluctance motors lsrms with different machine configurations have been explored past in the literature 112. Modular linear transverse flux reluctance motors dancristian popa, vasile iancu, lorand szabo, department of electrical machines, technical university of clujnapoca ro400020 clujnapoca, romania. This configuration contain 8 translator pole and this similar to 86 8 stator and 6 rotor poles rsrm.
In this study, an electromagnetic design of double sided linear switched reluctance motor lsrm is presented. This thesis investigates a novel topology in which a linear switched reluctance machine lsrm propulsion drive is incorporated in. One phase winding of the motor is composed by two coils placed on the opposite stator poles. Nonlinear digital simulation models of switched reluctance. Pressurized air is supplied between the primary and secondary circuits of the reluctance type linear motor to maintain an air gap between them. The machine has several air gaps, crossed by a single magnetic flux, in which the magnetic force is obtained. Design and analysis of a double sided linear switched reluctance. The primary circuit of a linear motor is permanently fitted to a wall of a building while its secondary circuit is fitted in conjunction with the elevator car and moves with the elevator car. In addition, a simpler controller based on pid regulator is employed to upgrade the.
A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. Although srm motors have been used for this application 12, an iron core is required. Index termslinear and rotational switched reluctance drives, propulsion, torque and efficiency. Reluctance motors can deliver high power density at low cost, making them attractive for many. For example, shi and toliyat proposed a vector control of a fivephase synchronous reluctance motor with space vector pulse width modulation for minimum switching losses 24. The linear switched reluctance motors lsrms have many benefits such as simple structure, low cost, comparatively high force. The proposed simulation model is intended as a useful and reliable tool for the computeraided design of any reluctance linear motor. Itisalsoadaptabletoharsh environments and can be controlled easily in terms of position and velocity. Improvements in the mechanical structure of the linear. Introduction in modern manufacturing industry, linear motion systems that are capable of high precision and high speed are especially required. 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. Position measurement and control of a thin and compact linear. Parts of the switched synchronous reluctance motor srm the srm is constituted by the rotor and the stator.
On the control of a rotarylinear switched reluctance motor. To simulate the translation motion, obligatory three. In this chapter, first, a mathematical model is presented, and then a procedure for the design of this kind of machines is proposed. Physical modeling of switched reluctance motors using. The aim of the proposed control is to damp the position of the studied motor. Pressurized air is supplied between the primary and secondary circuits of the reluctance type linear motor. Half step position sensorless control of a linear switched reluctance motor based on back emf k.
A linear switched reluctance motor comprises a movable coil bracket including first and second coil assemblies. This greatly simplifies mechanical design as power does not have to be delivered to a moving part, but it complicates the electrical design as. Lsrm controlled by pic 18f452 microcontroller was used to drive automatic door. One of the setbacks in the lsrm family is the presence of high force ripple. Simulation of a 64 switched reluctance motor based on matlab. This paper is devoted to the simulation of the whole lsrm drive, including the linear motor, the power converter and the control. Jan 01, 2019 in contrast, linear switched reluctance motors lsrms are free from the problems caused by pms. The proposed switched reluctance rotary linear motor practically combines three identical rotating motors with a linear one.
Linear switched reluctance motor lsrm drives are investigated and proved as an alternative actuator for vertical linear transportation applications such as a linear elevator. Linear switched reluctance motor lsrm presented in this paper contains only linear motion guide, siliconsteel plate and coil. The linear switched reluctance motor lsrm enjoys all the advantages of rotary switched reluctance machines including a simple and rugged structure, absence of magnetic material and windings on translator, high reliability, and appropriate performance over a wide range of speeds. Moreover, they can induce the linear switched reluctance motor to. It aims to replace the traditional rotary linear machines as a higher performance and lower cost alternative. Linear switched reluctance motors lsrms are an alternative to linear induction motors or permanent magnet synchronous motors. Schematic of the iron core in this paper, a new approach in maximum inductance calculation is proposed based on energy method. In order to deal with the nonlinear characteristics of switched reluctance drives, an analytical approximation function is applied when building a motor model. In this letter, based on a structural decoupling design for the mover, a bearingless linear switched reluctance motor is proposed to simplify the levitation force control. Synchronous motors are more suitable for this application, and in many cases either switched reluctance motors srm or permanent magnet synchronous motors pmsm have been used.
Linear switched reluctance motor control with pic18f452. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Linear switch reluctance motors lsrms have the same advantages as other linear motors. Uses soft magnet rotor that is magnetized by the application of current in the stator coils 3. Us6305501b1 elevator reluctance linear motor drive. Design of transverse flux linear switched reluctance motor. Mbarek emc 2 l 1 sin2 x vi c 9 emd 2 l 1 sin2 x 3 2vi d 10 f a x, f b x, f c x and f d x are the forces generatedbyexcitationofthephasesa,b,canddrespectively. All simulations are completely documented through the paper by their block diagrams and.
Pdf linear switched reluctance motor design and performance. Assessment of linear switched reluctance motors design. Austin hughes, bill drury, in electric motors and drives fifth edition, 2019. The motor is based on the variable reluctance principle. Control of linear switched reluctance motor for sliding. This mover is designed to exhibit two decoupling features, one feature is that the levitation field and the armature field is decoupled by separating the levitation part and.
Half step position sensorless control of a linear switched. Index terms linear and rotational switched reluctance drives, propulsion, torque and efficiency. A linear motor was proposed in 8 that is based on an lsrm. Characteristically, a linear motors active section has ends, whereas more conventional motors are arranged as a continuous loop. The different variants of the modular variable reluctance linear motors in discussion eliminate several disadvantages of both the classical hybrid stepper motors and linear switched reluctance machines 7. Using a smooth laminated armature assembly, with a ferromagnetic doublehelix stator shaft, provides an economical radial pole linear reluctance motor requiring no external armature bearings. Each of the first and second coil assemblies further comprises a plurality of coils separately wound around a plurality of motor coil cores, each of the coils being configured to receive a sinusoidal current at a different phase from other coils comprised in the same coil assembly. Pdf linear synchronous reluctance motors lsrelms are becoming an attractive alternative for linear induction motors lims, linear synchronous. Pdf this paper introduces a design procedure as well as an experimental and analytical investigation for linear switched reluctance motor lsrm. Magnetic circuit analysis of a linear switched reluctance motor. Controller design for synchronous reluctance motor drive. Pdf linear synchronous reluctance motor a comprehensive. They are an attractive alternative to linear induction and linear synchronous machines due to lack of windings on either the stator or translator structure.
However, because of the simple construction with lower manufacturing and maintenance cost, linear switched reluctance motors lsrms are widely researched for use in such applications. The stator shaft has a doublehelical screw tooth pattern cut into its surface. It can be used in precise two degrees of freedom motion control systems, as pick and place equipment, robotics, instrumentation, automotive applications, etc. Linear switched reluctance motor lsrm is one of the linear motors that can be used in such drives.
A linear motor is an electric motor that has had its stator and rotor unrolled thus instead of producing a torque it produces a linear force along its length. Design and control of a ropeless elevator with linear. Linear switched reluctance motor lsrm drives are investigated and proved in this study as an alternative actuator for vertical linear transportation applications such as a linear elevator. Linear switched reluctance motor as a high efficiency. This paper presents the realization and design of a linear switched reluctance motor lsrm with a new stator structure. Design and experimental verification of linear switched.
The torque ripple is an inherent drawback of switched reluctance motor drives. Pdf ropeless elevator with linear switched reluctance motor. Design and analysis of ei core structured transverse ux. Spaces between screw threads are preferably filled with low permeability material. The analysis was conducted in two dimensions using. Pdf linear synchronous reluctance motora comprehensive. Design, modeling and analysis of linear switched reluctance. There is an increasing interest in direct drive systems with continual development of power electronics and control strategies.
The motor is based on the variable reluctance principle 5. Us6305501b1 elevator reluctance linear motor drive system. A new linear switched reluctance motor with maglev effect. The linear reluctance motors were considered under both ac and dc supply. Ee 3410 electric power electromechanical energy conversion.
A onetenthscaled prototype elevator that is focused on a home elevator with lsrms is designed, and extensive experimental correlation is presented for the first time in this paper. In this case the motor is called synchronous linear motor. Design, modeling and analysis of linear switched reluctance motor for ground transit applications doi. However, application of these motors is limited because of their force ripple. A 3d boundary integral equation is applied to a model of a short primary linear reluctance motor. Design of a high speed linear switched reluctance motor lsrm is presented in 6.
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