Book switched reluctance motor drives pdf download m. Ee2403 special electrical machines a course material on. Abstractthis paper deals with a novel design conception of switched reluctance motor srm for electrical vehicles as electrical mini truck. Other articles where reluctance motor is discussed. Reluctance motor subtypes include synchronous, variable, switched and. Thus finally the reluctance motor runs as a synchronous motor. Up to 94% efficiency, much more efficient than acim alternate current induction motormachine in all speed. Design of linear switched reluctance motor driver for. A stepping motor is a special case of a variable reluctance motor or a permanent magnet brushless dc motor. There is the similarities between the reluctance motor and brushless dc motor in terms of current, air gap waveforms. This motor works on the principle of variable reluctance. In terms of efficiency and power density, synchronous reluctance motors synrms represent a major step forward in sustainable electric motor technology. Pdf efficiency analysis of synchronous reluctance motors.
Synchronous reluctance motor ideal for pumphydraulic applications. It must also be taken into account that this work has been an msc final project and it is clear that. Ee2403 special electrical machines sce department of electrical and electronics engineering because there is no rotor copper loss. Synchronous reluctance machine design ii preface certainly this work will never be perfect, because the writer is taking his first steps towards the electrical engineering world. With asimmetrical magnetic system 3phase 124 srd 124 srm. Synchronous reluctance motor is designed for high power applications. The threephase synchronous reluctance motor synrm is presented as a possible alternative in allelectric ship applications. The stator of the single phase reluctance and induction motor are same. The analysis is performed to estimate the influence of the number of stator slots and nonmagnetic areas in the rotor.
A stepper motor is designed to make it suitable for open loop position and. It can broadly be classified into axially laminated and radially laminated. This design consists of segmented stator with toroid windings water cooled and the rotor has salient poles. Synchronous reluctance motorconstruction, working principle and types pnb. The results include a detailed comparative analysis of the performance values of various modes of the developed synchronous reluctance motor and the series induction motor of the same power made. Unit 1 synchronous reluctance motors constructional. The analysis is performed to estimate the influence of.
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. Stators magnetic fields synchronous motor brushless motor cylindrical structure field flux. It receives the significant response from industries in the last decade because of its simple structure, ruggedness. In this situation lack of perfect knowledge is normal. Construction of switched reluctance motor variable. The resistance of the rotor must be very small and the combined inertia of the rotor and the load should be small to run the motor as a synchronous motor. A novel concept of ribless synchronous reluctance motor for. The reluctance of the rotor to the stator flux path varies with the position of the rotor. The number of flux barriers per each pole ranges from 2 to 5 typically. Permanent magnet synchronous reluctance motor design.
With continued research, different topologies have emerged presenting less torque ripple, high efficiency, high. Switched reluctance motor srm is also known as variable reluctance motor. Characteristics and work principles of switched reluctance sr motor photo credit. The stator poles have concentrated winding rather than sinusoidal winding. A technological and smart solution for ever increasing demand for high efficiency and cost reduction. The dynamic angle control scheme is similar to power angle control in synchronous. Because they require a power electronic converter and controller to function, however, successful realization of. Instead, the magnetic principle of reluctance is utilized.
Reluctance motor a single phase synchronous reluctance motor is basically the same as the single cage type induction motor. The synchronous reluctance motor magnetic reluctance is the magnetic equivalent of the resistance in electrical. One form of reluctance motor is shown in cross section in the figure. Sr motor principle and related torque general equation. A synrm rotor has neither a conducting short circuit cage as with the im, nor permanent magnets, nor a field excitation winding. As the name suggests, a switching inverter is required for the operation of switched reluctance motor. This is a 4phase machine with 4 stator pole pairs and 3 rotorpole pairs 86 motor. Download book pdf energy efficiency in motor driven systems pp 101110 cite as. The structure of reluctance motor is same as that of salient pole synchronous machine as.
A novel design conception of switched reluctance motor for. Motor runs at slip speed reluctance torque, trel reluctance torque, trel maximum reluctance torque, trelmax occurs at. In addition, many studies have been carried out to enhance the performance of these motors as potential alternative to ac asynchronous and synchronous. The coils wound around diametrically opposite poles are connected in series and the three phases are energized from a d. Due to the simple motor construction, an srm requires a. 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.
It has wound field coils of a dc motor for its stator windings and has no coils or magnets on its rotor. The advantages of the synchronous reluctance motor ee. Due to simple and rugged motor construction, low weight, potentially low production cost, undemanding cooling, excellent torquespeed characteristics, high torque density, high operating efficiency, and inherent fault tolerance, switched reluctance motor srm drives are. Principle of operation of switched reluctance motor. In the last years, the switched reluctance machines srms have been the subject of significant developments. We know about different types of synchronous motors, apart from all these motor works based on reluctance. The reluctance motor is a type of synchronous machine.
Abb drives synchronous reluctance motordrive package for machine builders 3 acs850 drive features sate torque off sto as standard removable memory unit runs any motor type including synchronous reluctance motors excellent control performance sensorless synchronous motor control provides precise speed control. A switched reluctance motor is also known as a variable reluctance motor. The switched reluctance machine srm is the least expensive electrical machine to produce, yet one of the most reliable. Basically its kind of a stepper motor which rotates through a step angle when. The variable reluctance motor is based on the principle that an unrestrained piece of iron will move to complete a magnetic flux path with minimum reluctance, the magnetic analog of electrical resistance synchronous reluctance. The switched reluctance motor srm is an electric motor which operates on reluctance torque. Reluctance motor technical seminar report annual year 2014, electrical and electronics department, sdmt, ujire574240 page 4 chapter 2 switched reluctance motor 2.
This means, the rotor always tries to align along the lowest reluctance path. However, due to mechanical, as well as operational reasons, permanent magnets in synchronous machines are restricted to those with ratings much lower than large turbinedriven generators, which is the subject of this book. 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. Mathematical analysis consider an elementary reluctance motor as shown in the fig. The construction of the reluctance motor is shown in the fig. Krishnan written the book namely switched reluctance motor drives author r.
International journal of information and electronics engineering, vol. Anju and rajasekaran design and performance analysis of high speed switched reluctance motor drive for various industrial applications fig. The sr motor produces torque through the magnetic attraction which occurs between stator electromagnets and a corresponding set of salient poles formed on a simple rotor made only of ferromagnetic material. This doublysalient arrangement is very effective for electromagnetic energy conversion. If the rotating field of a large synchronous motor with salient poles is deenergized, it will still develop 10 or 15% of synchronous torque. The rotor structure of synchronous reluctance machines synrel is conventionally retained mechanically by iron ribs. Control methods of the switched reluctance motor in.
Rotor design of linestart synchronous reluctance motor to improve starting performance seunghyoung ha1, jungpyo hong1, jiyoung lee1, hyuk nam2, gyuhong kang3 dept. To achieve this a suitable theoretical model is essential, thus a simple but complete motor model is developed. Switched reluctance motor for electrical drives offor. The synchronous reluctance motor has no synchronous starting torque and runs up from stand still by induction action. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. Basically the synchronous reluctance motor is a true ac rotating field machine, requiring a balanced polyphase sinusoidal supply into a distributed winding, which for all intents and purposes is identical to that of the induction machine of the same power rating. Characteristics and work principles of switched reluctance. As such, research has blossomed during the last decade, and the srm and variable drive systems using srms are receiving considerable attention from industry. Reluctance motors operate on the principle that forces are established that tend to cause iron poles carrying a magnetic flux to align with each. Synchronous motors controlled by variablespeed drives are. Electric drives brushless dc ac and reluctance motors. Usually the number of stator and rotor poles is even. The srm has the lowest construction cost of any industrial electric motor because of its simple structure citation needed. Although introduced over a century ago, electric motors continue to experience bursts of innovation and recent years have seen remarkable progress in electric motor efficiency improvements.
Switched reluctance motor for electrical drives offor electrical drives electric power plants equipment vladimir kuzmichev mpeitu, orgres. The reluctance motor has basically two main parts called stator and rotor. Synchronous motor power developed by a synchronous motor alternative expression for power developed various conditions of maxima salient pole synchronous motor power developed by a salient pole synchronous motor effects of excitation on armature current and power factor constantpower lines construction of vcurves. Pdf study of the synchronous reluctance motor design. Synchronous reluctance motordrive package for machine. Because of inherent simplicity, robustness of construction and low cost. The srm has the lowest construction cost of any industrial electric motor. A new construction of switched reluctance motor improving. Sequential switching figure below of the stator phases moves the rotor from one position to the next. Although permanent magnet motors are the first that come to mind when we talk about motion control, the high price of rareearth magnets has driven oems to consider other solutions like switchedreluctance sr motors. The rotor has neither windings nor permanent magnets. Here is a view of a synrm synchronous reluctance motor in order to understand the working principle of such motor, you should realise that the synrm rotor has neither a conducting short circuit cageas the im doesnor permanent magnets or field. The first rotating magnetic field synchronous motor was introduced in literature already from 1923 kostko 1923, douglas 1956, cruickshank 1966, elantably 1985 1.
The switched reluctance motor is an old member of the electric machine family. It works on the same principle as for stepper motor. The rediscovery of synchronous reluctance and ferrite permanent magnet motors. Switched reluctance motors srm have inherent advantages such as simple structure with non winding construction in. Construction of srm the physical appearance of a switched reluctance motor is similar to that of other rotating motors ac and dc induction motor, dc motor etc. Unlike a conventional synchronous motor, both the rotor. Due to variable air gap between stator and rotor, when rotor rotates, reluctance between stator and rotor also changes. The switched reluctance motor srm is a form of stepper motor that uses fewer poles. Analytical design of a synchronous reluctance motor srm. The rotor of a reluctance motor is a squirrel cage with some rotor teeth removed in the certain places to provide the desired number of. The stampings are slotted on its periphery to carry the winding called stator winding. Pdf the paper focuses on studying the externalrotor synchronous reluctance motor. Switched reluctance motors the structure of a switched reluctance motor is shown below. Pdf the volatilities in the permanent magnet price have raised interest.
The construction of 86 8 stator poles, 6 rotor poles poles srm is shown in fig. Common uses include applications where the rotor must be held stationary for long periods, and in potentially explosive environments such as mining because it operates without a. Abb synchronous reluctance motor and drive package. Synchronous reluctance motor intoduction concepts youtube. The rotor structure is supported by thin magnetic iron bridges.
Pdf books download book switched reluctance motor drives by r. The theory used in the work was collected by studying literature on how electrical motors work, and by simplifying the explanations to suit the intended reader. For our discussion, 4 pole rotor constructi6n is elected. Thus the dc machine controller can be used to control the switched reluctance motor for low cost and as well as for high volume applications. What are the applications of synchronous reluctance motor. Switched reluctance motor construction and working.
So rotor has 4 salient poles without any exciting winding as shown in the fig. Reluctance is a function of rotor position in a variable reluctance motor. The stator of the motor has the main and auxiliary winding. Rotor design of linestart synchronous reluctance motor to. Here we will discuss construction and working principle of reluctance motor. The basic features of this motor with regard to the other types of motors are shown. The paper focuses on studying the externalrotor synchronous reluctance motor. This paper covers reluctance machine theoretical background, rotor. Reluctance torque an overview sciencedirect topics. The structure of the motor and specifically the structure of its rotor are analyzed, while the basic operating principles are presented and references on commonly used control. It is usually assumed that windings of pmsrm are ributed sinusoidally. Permanent magnet assisted synchronous reluctance motor.
706 403 1512 1250 1466 1251 1020 253 44 673 1557 476 1590 1154 1432 847 208 354 222 1373 81 134 1435 9 1054 538 1109 1304 214 148 686 651 122 267 692