Studying different types of power converters fed switched. Smcs switched reluctance motor is changing the game. The stepper motor which includes some of the features of the modern switched reluctance motor was invented and patented in the 1920s in aberdeen by c. Linear switched reluctance motor lsrm drives are investigated and proved as an alternative actuator for vertical linear transportation applications such as a linear elevator.
It generates torque through magnetic reluctance reluctance motor subtypes include synchronous, variable, switched and variable stepping. Researchers from oak ridge national laboratory ornl found that the smart motor was on average 4% more efficient than a premium motor combined with a vfd, and cost about half as much. Switched reluctance motor is finding massive application in various fields due to its high performance when combined together with the power electronics. Smc designed a mechanically leaner, switched reluctance motor and developed intelligent software to control it, making the motor inherently more efficient and reliable. Smart motors integrate an innovative electric motor design with a programmable variablefrequency drive vfd. Torque per unit volume equations are obtained for each of the motor, related to quantities such as magnetic flux density and electric loading and the speed performances are. For their operation the excitation unit which is controlled in accordance with. Motor runs at slip speed reluctance torque, trel reluctance torque, trel maximum reluctance torque, trelmax occurs at. A mathematical and fem design of novel axial field switched. Industrial interest in switched reluctance motor srm drives has varied since 1850s. In the light of above it is a competitive motor variable speed dc motor and variable speed 3 phase cage induction motor. You benefit from proven reliability and excellent figures of merit along with.
The early attempts faced serious limitations on account of inadequate switches and poor electromagnetic and mechanical design. Variable reluctance motors or steppers actually use rotors like those in figure below. Switched reluctance motor srm inverter design with the. The absent of permanent magnet, inherent fault tolerance. 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. Switched reluctance generators in contrast to wellknown conventional generators switched reluctance generator srg have toothed stator and rotor, and have neither windings nor permanent magnets in the rotor.
This paper presents a design and development of 86 switched reluctance motor for small electric vehicle using analytical method. However, in 1980 the foundation for the sr motor and its practical design may be reckoned with prof. The hrsr motor is purportedly more efficient than induction motors for all motor speeds and is inherently variable speed. This thesis presents a design method for a switched reluctance sr motor to optimise torque production for two types of 3 phase 64 poles srm and 86 poles srm designs.
A onetenth scaled prototype elevator focused on a home elevator with lsrms is designed and extensive experimental correlation is presented for the first time. In this article novel axial field switched reluctance motor afsrm design is presented which intend to improve the output torque by single flux path distribution. Switched reluctance motor modes of operation converter. Switched reluctance motor srm the switched reluctance motor srm is a type of motor doubly salient with phase coils mounted around diametrically opposite stator poles. A simple application of this principle is the refrigerator magnet, which is held in place by reluctance force. The reluctance motor is a type of synchronous machine.
It describes the comparison results and the performance. Pdf systematic design procedure of switched reluctance motors. Switched reluctance motors are electrically commutated ac machines and are also known as variable reluctance motors. The switched reluctance motor drives have several advantages, e. Set to 64 default to specify a threephase 64 motor set to 86 to specify a fourphase 86 motor set to 108 to specify a fivephase 108 motor set to 64 60 kw preset model, 86 75 kw preset model, or 108 10 kw preset model to use a predetermined specific model of a switched reluctance motor. The companys patented and awardwinning system has been tested in labs and the field and found to boost efficiencyreducing hvac energy use by up to 50% when compared to. With continued research, different topologies have emerged presenting less torque ripple, high efficiency, high. Research on torque ripple control of switched reluctance motor. A new skewedrotorpole switched reluctance motor design. Charged evs a closer look at switched reluctance motors. The concept of switched reluctance motor srm was established in 1838 but the motor could not realize its full potential until the modern era of power electronics and computer aided electromagnetic design. Design of a faulttolerant 6phase switched reluctance motor for electric powerassisted steering systems. In switched reluctance motor applications both energy and cost efficiency play integral roles. Some disadvantages are torque ripple and high noise.
Switched reluctance motor srm is gaining much interest in industrial applications such as wind energy systems and electric vehicles due to its simple and rugged construction, high. Download switched reluctance motor drives modeling simulation analysis design and applications easily in pdf format for free. Optimal design of switched reluctance motors semantic scholar. The paper also introduced why the asymmetric bridge converter type is the best one especially for high speeds. If smooth rotation is the goal, there is an electronicdriven version of the switched reluctance motor. In references 1 8 authors indicates the design of exterior rotor and analyzing the design with the finite element. Pdf comparison of switched reluctance motor and double stator. The concept of sr motor can be traced back to 1838, of the locomotive era 2. The simulation results are made by matlabsimulink package. A variable reluctance motor intended to move in discrete steps, stop, and start is a variable reluctance stepper motor. As such, research has blossomed during the last decade, and the srm and variable drive systems using srms are receiving considerable attention from industry. The switched reluctance machine srm is the least expensive electrical machine to produce, yet one of the most reliable. Electric drives brushless dc ac and reluctance motors.
Design of switched reluctance motors and development of a. Introduction ths iappcoiailtn noet desbecirs the degsin o af sensoelrss. International journal of information and electronics engineering, vol. Unlike common brushed dc motor types, power is delivered to windings in the stator case rather than the rotor. Characteristics and work principles of switched reluctance sr motor photo credit. Model the dynamics of switched reluctance motor simulink. Switched reluctance motor srm controller and driver. Commutating switched reluctance motors with pmac 3 phase referencing as a synchronous motor, the phase position information for an sr motor must have an absolute reference. Using the software package magnet analysis of switched reluctance motor is carried out in order to obtain the performance characteristics. Sr motors require precise control to optimise the operating efficiency. When you use these presets, you do not need to specify the parameters in the.
Switchedreluctance sr motor concept has been known since 1838. This paper presents the design procedure for three phase switched reluctance motor srm with two different cases case1. There are numerous softwares available for the modelling of. Pdf linear switched reluctance motor design and performance. Simulation and testing of a switched reluctance motor by. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. Fem analysis, shape optimization, switched reluctance motor, torque. Pdf design of switched reluctance motor with exterior. Synchronous reluctance machine design 1 1 introduction the purpose of this report is to present information necessary for developing a suitable synchronous reluctance motor synrm rotor geometry design procedure.
Design and control of a ropeless elevator with linear. Reluctance torque is the torque generated because the motor is moving to a position where the reluctance seen by the armature flux is declining. To achieve this a suitable theoretical model is essential, thus a simple but complete motor model is developed. Switched reluctance motors srm are seeing a resurgence as motor manufacturers improve their performance, reliability, efficiency, and cost as. But the lack of semiconductors to rapidly switch current on and off and a limited supply of engineers with the technical knowledge. There are no windings or permanent magnets on the rotor. Their structure is similar to that of stepper motors, but switched reluctance motors have fewer magnetic poles. The goal of this project was to evaluate a high rotor pole switched reluctance hrsr motor system for use as a condenser fan motor for commercial refrigeration systems.
The rotor is basically a piece of laminated steel and its shape forms salient poles. Magnetfree and winding free nature of the rotor, attracts fame for switched reluctance motor, the same reasons results in the reduction of cost and ease of construction. Simulation and testing of a switched reluctance motor by matlab simulink and dspace master of science thesis in electric power engineering saman abbasian department of energy and environment faculty of electric power engineering chalmers university. These converters are rdump, cdump, cdump with freewheeling transistor, asymmetric, series, and parallel type. The recent surge of activity since the 1980s has spurred university and industrial research and product development in the u. The pc master software referenced in this document is also known as free master software.
A fourphase 86 pole and 75 kw switched reluctance motor drive based on 32bit digital signal processor tms320f2812 is designed. Characteristics and work principles of switched reluctance. These steps are design optimization of the motor, identification of the motor parameter and implementation of an advanced control system to ensure optimum operation. Because the reluctance along the path of the magnet flux is minimized when the magnet is as close as possible to in contact with the. In this book, motor design facto rs are not considered and detailed characteristics of each control method are introduced in ord er to give the advanced knowledge about torque control method in srm drive. Design of switched reluctance motor with exterior and.
Design, power electronics and torque control of switched reluctance machines. This does not mean that an absolute position sensor must be used. Pdf design of a switched reluctance motor in ansys. Design of linear switched reluctance motor driver for automatic door application m.
Top quality motor control and motor drive solutions from infineons wide portfolio are the ideal choice. The motion equation of switched reluctance motor is. Switched reluctance motor drives for hybrid electric. Evaluation of high rotor pole switched reluctance motors.
It has wound field coils of a dc motor for its stator windings and has no coils or magnets on its rotor. The modular motor concept originally came out as a response to. Design of linear switched reluctance motor driver for. Reluctance torque an overview sciencedirect topics. A new skewedrotorpole switched reluctance motor design 239 some potential advantages for the proposed new srm are listed as below. This thesis presents a design method for a switched reluctance sr motor to optimise torque production for two types of 3 phase 64 poles srm and 86 poles. The switched reluctance motor srm is a type of stepper motor, an electric motor that runs by reluctance torque. Therefore, this dissertation first deals with the design optimization of the permanent magnet assisted synchronous reluctance motor pmasynrm. It was called the doublysalient reluctance motor and the layout is shown in fig. It can be seen that the changes of j, tl and b all affect the. Simple reluctance machine with one phase and two poles on both the stator and rotor. Besides, they have not introduced any matching with the conventional design approaches used in classical machine design. Switched reluctance motors are mainly used in traction, industrial and automotive pumps and home appliances vacuum cleaners and certain washing machines. Pdf this paper introduces a design procedure as well as an experimental and analytical investigation for linear switched reluctance motor lsrm.
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