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. Design considerations of switched reluctance motors with. When the rotor is out of alignment, the inductance is very low and the current also increase rapidly. The plc performs a pilike control strategy, giving the current. Variable reluctance motor vrm the variable reluctance motor is an evolution of the stepping motor and is generally designed for use in low power, open loop position and speed control systems where efficiency is not of prime importance. This is a 4phase machine with 4 stator pole pairs and 3 rotorpole pairs 86 motor. Switched reluctance motors science topic explore the latest questions and answers in switched reluctance motors, and find switched reluctance motors experts. Principle of operation of switched reluctance motor engineering essay. Simulation and testing of a switched reluctance motor by. The windings in the stator are wounded externally and slid on to the stator poles. Unlike a conventional synchronous motor, both the rotor and stator of a switched reluctance motor have salient poles. Reluctance motor technical seminar report annual year 2014, electrical and electronics department, sdmt, ujire574240 page 4 chapter 2 switched reluctance motor 2. The motor has a stator which is usually wound for three phases.
Variable reluctance motor brushless reluctance motor commutated reluctance motor 4. The structure of a switched reluctance motor is shown below. The article is devoted to the comparative research of performances of controlled drives with a synchronous reluctance motor synrm and with an induction motor im in a pump application. 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. In addition, a sixslot, tenpole 610 srm with a sixphase winding configuration under the twomode bipolar excitation is optimized by solving a. The rotor is basically a piece of laminated steel and its shape forms salient poles. 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. Switched reluctance motors srm have inherent advantages such as simple structure with non winding construction in rotor side, fail safe. Design and performance analysis of high speed switched.
Srm has simpler construction and, therefore, lower production costs, higher robustness and lower maintenance requirements as the im drives. Rotor design of linestart synchronous reluctance motor to. Anju and rajasekaran design and performance analysis of high speed switched reluctance motor drive for various industrial applications 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. The synchronous reluctance motor has no synchronous starting torque and runs up from stand still by induction action. Characteristics and work principles of switched reluctance. A new construction of switched reluctance motor improving magnetic field energy and torque production durmu uygun, caner akuner, mehmet yumurtaci bozok university, akdagmadeni technical vocational school of higher education electricity programme, akdagmadeni, 66300 yozgat, turkiye.
A new construction of switched reluctance motor improving. Because of inherent simplicity, robustness of construction and low cost. Motor runs at slip speed reluctance torque, trel reluctance torque, trel maximum reluctance torque, trelmax occurs at. Switched reluctance generators srg running the engine at variable speed and using power electronics to convert the variable frequency to a fixed voltage and frequency can allow more efficient operation of the genset. Reluctance motor subtypes include synchronous, variable, switched and variable stepping. Reluctance motor technical seminar report annual year 2014, electrical and electronics department, sdmt, ujire574240 page 2 is similar to that of any one of the singlephase induction motors. Except for the permanent split capacitor psc motor, all motors 1phase im are provided with a. Usually the number of stator and rotor poles is even. 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. Model of switched reluctance motor for utilization in. I hope that my designing deals with the application of a particular type of inverter for the variable reluctance motor drive.
Construction of switched reluctance motor variable. Switched reluctance motor srm, rotor position, sensorless method, flux linkage. Construction details of switched reluctance motor with six stator poles and four rotor poles can be explained by referring to figure 3. The so called synchronous reluctance motor has a different construction and functions slightly differently. The reluctance motor has basically two main parts called stator and rotor. Electric drives brushless dc and reluctance motors. It has simple mechanical construction and does not require permanent magnet for its operation. Apart from the working they have many advantages such as simple and low cost construction. It describes the comparison results and the performance. The stator has a laminated construction, made up of stampings. Sr motors require precise control to optimise the operating efficiency. Variable reluctance motors or steppers actually use rotors like those in figure below. And the control strategies commonly used in this srd are main.
To develop positive torque, the currents in the phases of a srm must be to the rotor position. Pdf efficiency analysis of synchronous reluctance motors. The construction of 86 8 stator poles, 6 rotor poles poles srm is shown in fig. The basic construction of switched reluctance motor is shown in the figure. Optim, switched reluctance motor, sensorless speed control, estimation of rotor position. The stator and rotor in a sr motor have salient poles. The stator of the single phase reluctance and induction motor are same. This paper presents the design procedure for three phase switched reluctance motor srm with two different cases case1. National institute of technology rourkela certificate this is to certify that the thesis entitled direct torque control of switched reluctance motor drives submitted by amalendu dash. A reluctance motor torque is produced due to the tendency of the rotor to align itself in the minimum reluctance position, when the speed of the motor is close to the synchronous speed.
Pdf abstractthis paper is performed to develop a new 86 pole switched reluctance motor srm in order to improve the magnetic field. Introduction the applications of srm drive have been increased in years due to its simple construction. Switched reluctance sr motor is a brushless ac motor. This means, the rotor always tries to align along the lowest reluctance path. The stator of the motor has the main and auxiliary winding. The switched reluctance motor srm is an old member of the electric machines family. Rotor design of linestart synchronous reluctance motor to improve starting performance seunghyoung ha1, jungpyo hong1, jiyoung lee1, hyuk nam2, gyuhong kang3 dept. 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. It is a single phase motor and its rotor is made of ferromagnetic material with non magnetic support over the shaft. A new switched reluctance motor configuration is proposed, in which the windings are arranged to encourage short magnetic flux paths within the motor. In the light of above it is a competitive motor variable speed dc motor and variable speed 3 phase cage induction motor. Switched reluctance motor srm is also known as variable reluctance motor. Switched reluctance motor for electrical drives offor. This motor works on the principle of variable reluctance.
In the simulation results, how the rotor minimizes the reluctance position during excitation in a magnetic circuit is presented in this work. Reluctance motors operate on the principle that forces are established that tend to cause iron poles carrying a magnetic flux to align with each. Oct, 2014 switched reluctance motors science topic explore the latest questions and answers in switched reluctance motors, and find switched reluctance motors experts. In many papers, switched reluctance motor srm is mentioned as a viable alternative for an electric car drive 3, 7, 8, 9. Ee2403 special electrical machines sce department of electrical and electronics engineering because there is no rotor copper loss. It is demonstrated that short flux paths significantly reduce the mmf required to establish the bfield pattern in a motor. They have rotor and stator poles with no windings on the rotor and the concentrated windings on the stator. Unlike common dc motor types, power is delivered to windings in the stator case rather than the rotor. Ee2403 special electrical machines a course material on.
The rotor has neither windings nor permanent magnets. One form of reluctance motor is shown in cross section in the figure. For the test drive, we selected the fluxcurrent method. Since the variable reluctance motor has a high torque with the inertia ratio normal when compared with other motors. Characteristics and work principles of switched reluctance sr motor photo credit. 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. Jun 16, 2016 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. Switched reluctance motor for electrical drives offor electrical drives electric power plants equipment vladimir kuzmichev mpeitu, orgres. It is a single phase motor and its rotor is made of ferromagnetic material with non magnetic support over the shaft hysteresis motor construction. Torque ripple minimization in switched reluctance motor. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. To achieve this a suitable theoretical model is essential, thus a simple but complete motor model is developed. The stator poles have concentrated winding rather than sinusoidal winding. Simulation and testing of a switched reluctance motor by matlab simulink and dspace saman abbasian department of energy and environment faculty of electric power engineering chalmers university of technology the main objective of this thesis is to build and test a srm drive system to provide a research platform.
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. Model of switched reluctance motor for utilization in sensorless control of electric drive pavel brandstetter1, martin kuchar1 and petr krna1 1vsb technical university of ostrava, department of electronics, czech republic abstract. Pdf this paper presents a design and development of 86 switched reluctance motor for small electric vehicle using analytical method. Pdf fuzzy logic control of a switched reluctance motor.
As it approaches synchronous speed, the reluctance torque is sufficient to pull the rotor into. This helps to explain the principle of operation of the stepper motors. The stator construction is laminated and assembled in a single stack. The operation of reluctance motor with diagram blogger. This paper presents the use of fuzzy logic control flc for switched reluctance motor srm speed. A very good overview of sensorless methods for determining the rotor position of switched reluctance motors is given in ray. Switched reluctance motor srm is an energy converter that converts an electrical energy to mechanical energy in motoring operation and viceversa in generating operation. As the name suggests, a switching inverter is required for the operation of switched reluctance motor. The srm has the lowest construction cost of any industrial electric motor because of its simple structure citation needed. The major reasons for srm are robustness, high efficiency, low cost, high speed, simple structure, easy to maintain, high controllability, high torque to inertia ratio, simple power converter circuits with reduced number of switches and smaller dimension of the motor in comparison to the other motors.
There are no windings or permanent magnets on the rotor. The switched reluctance motor srm is an electric motor which operates on reluctance torque. The following figure shows the ideal waveforms phase a inductance and current in a 64 srm. The stampings are slotted on its periphery to carry the winding called stator winding. Design of switched reluctance motor with exterior and. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on. The load inertia should be within the limits, for proper effectiveness. A stepper motor is designed to make it suitable for open loop position and. With advanced fuel or diesel engines and variable speed technology. Pdf systematic design procedure of switched reluctance motors. The switched reluctance motor srm is a form of stepper motor that uses fewer poles. This doubly salient arrangement is very effective for electromagnetic energy conversion.
The stator has six salient poles with concentrated exciting windings around each one of them. Basically its kind of a stepper motor which rotates through a step angle when. Jun 16, 2018 switched reluctance motor srm is also known as variable reluctance motor. Before being produced the 1612 switched reluctance motor was optimised and calculated with a finite. This doublysalient arrangement is very effective for electromagnetic energy conversion. The paper deals with a model of a switched reluctance motor srm that can be used for the. Reluctance motor a single phase synchronous reluctance motor is basically the same as the single cage type induction motor.
Short flux path motor configurations have been modelled extensively using electromagnetic finite element analysis. We know about different types of synchronous motors, apart from all these motor works based on reluctance. If smooth rotation is the goal, there is an electronicdriven version of the switched reluctance motor. Switched reluctance motors the structure of a switched reluctance motor is shown below. A variable reluctance motor intended to move in discrete steps, stop, and start is a variable reluctance stepper motor. Construction its a doublysalient, singly excited, independent stator exited motor the stator. Principle of operation of switched reluctance motor. This greatly simplifies mechanical design as power does not have to be delivered to a moving part, but it complicates the. Geometrical design equations and practical challenges are investigated. Switched reluctance motor construction and working.
It works on the same principle as for stepper motor. Model the dynamics of switched reluctance motor simulink. The srm has a single rotor construction, essentially made of stacks of iron. The drive with srm is becoming a very strong competitor to the drives with im. Sr motor principle and related torque general equation. Introduction srm can be classified on the basis of the nature of motion. The switched reluctance motor srm is a type of stepper motor, an electric motor that runs by reluctance torque. Pdf design of switched reluctance motor with exterior. The operation of reluctance motor with diagram a media to. Pdf a new construction of switched reluctance motor improving. 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. Switched reluctance motor srm inverter design with the drv8343q1.
The switched reluctance motor srm has both salient pole stator and rotor like a variable reluctance stepper motor. Pdf switched reluctance motor drives devendra tandel. Hysteresis motor is defined as a synchronous motor that is having cylindrical rotor and works on hysteresis losses induced in the rotor of hardened steel with high retentivity. Its simple structure, ruggedness and inexpensive manufacturing.