Its stator winding which consists of a we provide threephase supply to threephase stator winding, and dc to the rotor winding. Reluctance motors an induction motor with a modified squirrelcage rotor. Proceedings of the 14th international middle east power systems conference mepcon10, cairo university, egypt, december 1921, 2010, paper id 290. Ee6703 unit 1 synchronous reluctance motors 1 prepared by. Pdf design of synchronous reluctance motor for hybrid. This method works well when using a 2dimensional magnetic equivalent circuit of a machine by omitting the step of calculating the inductance values which are required for the calculation of the reluctance torque. The synchronous reluctance motor is an attractive option for low torque applications requiring efficient operation. The reluctance motor is arguably the simplest synchronous motor of all, the rotor consisting simply of a set of laminations shaped so that it tends to align itself with the field produced by the stator. Magnetic reluctance in the daxis is large and in the qaxis is small. The synchronous reluctance motor synrm has been studied. Hence, the size of the motor is large as compared to synchronous motor. Engineering, aalto university as part of the motor design and electromechanics research.
In this paper, a comparative study between induction motor and synchronous reluctance motor is proposed. Optimum design parameters for synchronous reluctance motors. Automated design of rotor topology for synchronous. Second geometry the saturated space between the slot and the outer diameter of the stator has been modified. Over the past decade, developments in machine design methodology, highquality magnetic materials.
Synchronous reluctance motor intoduction concepts youtube. As a result, the sensorless drive systems can reduce costs and improve reliability. A study on the comparison of the synchronous reluctance motor with induction motor has been. Reluctance torque an overview sciencedirect topics. Synchronous machines 2 in this chapter, we concentrate on conventional synchronous machines whereas the brushless dc motors will be discussed later in a separate chapter. Optimum design parameters for synchronous reluctance. As it will be shown latter, in synchronous machines the term power angle is used to. Metamodels for optimum design of outerrotor synchronous. Based on this principle, a reluctance motor is different from any other electric machine such as synchronous or induction machine.
Controller design for synchronous reluctance motor drive systems with direct torque control 255 generates noise, and requires space. A 300 w motor is designed and a thermal model was prepared using lumped thermal networking method. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. Home introduction design model optimization simulation inverter study conclusions design goals. In order to obtain correct recommendations for optimal design of the studied synchronous reluctance motor, analytical relations of motor electromagnetic parameters and geometrical dimensions also known as metamodels have been synthesized.
The force tends to align the specimen of the material in such a. 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. Coupled with special rotor lamination design, these machines offer synchronous speed operation with a simple, low inertia rotating assembly construction. Lowther mcgill university, department of electrical and computer engineering, montreal, qc, canada. A segmentalrotor synchronous reluctance motor is used in a variablespeed drive with currentregulated pulsewidthmodulated pwm control. Rather than using a traditional 3phase configuration, i was interested in investigating a highphase order machine with each stator slot corresponding to an individually controlled phase. Pdf automated design of rotor topology for synchronous. The synchronous reluctance motor magnetic reluctance is the magnetic. Reluctance motor subtypes include synchronous, variable, switched and variable stepping. A synrm rotor has neither a conducting short circuit cage as with the im, nor permanent magnets, nor a field excitation winding. It is a threephase sixpole motor, with 4 barriers per pole. Synchronous reluctance motor for household applications.
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. Reluctance motors are subject to cogging, since the locked rotor torque varies with the rotor position, but the effect may be minimized by. Abstracta segmentalrotor synchronous reluctance motor is used in a variablespeed drive with currentregulated pwm control. There is a narrow connection ring in the fringe of the rotor and. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on. Based on the optimization results, a prototype has been built and tested. Design of a synchronous reluctance motor drive ieee. Since the converter fed srm does not need a starting cage, an optimized rotor for synchronous performance.
Practical basics of synchronous motors that every electrical. Pdf the paper focuses on studying the externalrotor synchronous reluctance motor. Synchronous reluctance motor srm has recently attracted the efforts of a number of researchers and is gaining favor as a possible alternative for ac drives 14. 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 analysis is performed to estimate the influence of the number of stator slots and nonmagnetic areas in the rotor. Synchronous machine structures stator and rotor the armature winding of a conventional synchronous machine is almost invariably on the stator and is usually a three phase winding. Detailed design, analysis, and optimization processes are applied to the synchronous reluctance motors considering efficiency, power density. Design of a synchronous reluctance motor with nonoverlapping fractionalslot concentrated windings christopher spargo member, ieee school of electrical and electronic engineering, newcastle university, united kingdom c. Unit 1 synchronous reluctance motors constructional. To calculate eddy current and hysteresis loss in the stator, i used the built in harmonic ac solver in femm 4. The stator is the same as that of the pm synchronous motor. The analysis is performed to estimate the influence of the number of stator slots and nonmagnetic areas in the rotor i.
Sr motor principle and related torque general equation. Synchronousreluctance drive system drive technology. As the motor has no dc field excitation so the output of a reluctance motor is reduced. The purpose of this master thesis is therefore to design a high efficiency synchronous reluctance motor assisted with permanent magnets pmasynrm for pump applications and build a theoretical knowledge about how this machine works. Unlike a conventional synchronous motor, both the rotor and stator of a switched reluctance motor have salient poles. The stator has 30 slots, so each coil has a 180 degree pitch. Analytical design of a synchronous reluctance motor srm.
In recent year pmsrm is experiencing a growing interest in variable speed applications. Axial air gap motor it is another approach is to use laminations. 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. If the rotating field of a large synchronous motor with salient poles is deenergized, it will still develop 10 or 15% of synchronous torque. Synchronous motors are a doubly excited machine, i. The rotor of a reluctance motor is unexcited, therefore, the power factor is low as compared to the induction motor. Instead, the magnetic principle of reluctance is utilized. The design and simulation were carried out by using extensive finite element analysis with fcsmek. This doubly salient arrangement is very effective for electromagnetic energy conversion. Synchronous reluctance technology combines the performance of the permanent magnet motor with the simplicity and servicefriendliness of an induction. In order to have an efficient motor drive, performing of three steps in design of the overall drive is not avoidable.
Synchronous reluctance motordrive package for machine. V zakharov and others published synchronous reluctance motor. Variable speed drives lonna haataja, luha pyrhonen. Permanent magnet synchronous reluctance motor design. Although there are many different reluctance machine designs, the operating principle of all these machines are the same.
Abstracta segmentalrotor synchronous reluctance motor is used in a variable speed drive with currentregulated pwm control. To achieve this a suitable theoretical model is essential, thus a simple but complete motor model is developed. Recently, permanent magnet assisted pma synchronous reluctance motors synrm have been considered as a possible alternative motor drive for high performance applications. Study of the synchronous reluctance motor design in. These steps are design optimization of the motor, identification of the motor parameter and. A technological and smart solution for ever increasing demand for high efficiency and cost reduction. However, rotor position information is necessary 1, 2. The analysis is performed to estimate the influence of. Therefore, this dissertation first deals with the design optimization of the permanent magnet assisted synchronous reluctance motor pmasynrm. Synchronous reluctance motors process performance motors. Thus, unbalanced starting torque can be caused by depending on initial starting position. Synchronous reluctance machine synrm design diva portal.
Drives with synchronous reluctance technology are characterized by very high levels of efficiency, particularly at part load. Index items permanent magnet, synchronous reluctance motor design and finite element method. High performances design of a sixphase synchronous reluctance. A new design of synchronous reluctance motor with segmentshaped outer rotor is presented and investigated in this paper. Analytical method of torque calculation for interior. Design of a synchronous reluctance motor drive ieee xplore. In order to obtain correct recommendations for optimal design of the studied synchronous reluctance motor, analytical relations. Pdf study of the synchronous reluctance motor design. Design and optimisation of a linestart synchronous reluctance motor repository copy article. The machine starts as an induction motor until it approaches synchronous speed, when the rotor pulls in and locks to the rotating stator field.
Synchronous motors controlled by variablespeed drives are. The synchronous reluctance motor has no synchronous starting torque and runs. This reluctance torque action is discussed in chapter 10, which deals with stepping and switched reluctance motors. Design and comparative study of induction and synchronous. Reluctance motor designs have ratings that range from fractional horsepower a few watts to about 22 kw. Analytical design of a synchronous reluctance motor srm pag. Keywords flux barriers, motor design, synchronous motors, reluctance motors, finite. The paper deals with the design of a synchronous reluctance motor suited for hybrid electric vehicles. Aim and scope of the project the aim of the project is to design a real synchronous switched reluctance motor and analyze how the key parameters, some of which are great indicators of the good performance of the motor. For the sake of validation and tests of the design and optimization strategies for the syncrel, a commercial tefc threephase induction motor of equivalent size 3kw, 4 poles, 400v, 50 hz has been considered as reference. A singlephase linestart synchronous reluctance motor lssynrm has an unbalanced magnetic circuit due to flux barriers, and various shape or size of conductor bars. Permanent magnet assisted synchronous reluctance motor design and performance improvement a dissertation by peyman niazi submitted to the office of graduate studies of.
The text that was researched and compiled contains explanations of the motor parts, theory about electromagnetism and how current is used to. In this paper, the key points in the design of synchronous reluctance motors are first evidenced and discussed, that is, the choice of rotor type, the statorrotor joint design, and the. The rotor cores are laminated in the rotor shaft direction. There will also be a brief explanation to what is the purpose of the part that is described. 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. 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. To save computation time, rather than calculating the ac losses for each simulation in the optimization, i solved for the losses in a simplified geometry a simple tube with 50 mm od, and 42 mm id, the same dimensions as the stator back iron over the entire space of frequencies and. Permanentmagnet, reluctance, and induction motors compared it is possible to find superefficient highhorsepower motors but, at this point, many of. The project is centered on the design of synchronous reluctance motors and study on how this motor can be used for household applications. The ipm ac brushless machines are synchronous motors with high poles the switched reluctance motor is a synchronous machine with high poles the reluctance synchronous motor is sort of in between, although it is a synchronous machine the pole number can be 4, 6 or 8 for traction. The finiteelements method, is used to an accurate evaluation of magnetic field distribution in motors, any perturbation in this field would indicate a fault presence 6, taking different simulations of electrical motors. Rotor design of linestart synchronous reluctance motor to.
Take a conventional, proven stator technology and a innovative rotor design. Design of a synchronous reluctance motor assisted with. Synchronousreluctance drive system drive technology topics. The paper presents the design of a 4 poles, 20 nm, 400 v, 50 hz synchronous reluctance motor with four fluxbarriers. Several researchers have studied the rotor estimating technique to realize a sensorless drive. The lowspeed torque capability is compared with that of an induction motor, a switched reluctance motor, and a brushless dc pm motor of identical. The motor has good efficiency and low losses with good torque characteristics. Home technical articles practical basics of synchronous motors that every electrical engineer should know construction like the asynchronous motor, the synchronous motor consists of a stator and a rotor separated by the air gap. Ee2403 special electrical machines a course material on.
Thermal analysis of induction and synchronous reluctance. This paper presents a rotor design of a lssynrm to improve. The synchronous reluctance motor is one of highest efficiency and lowest cost motors through the optimal design methods 3,4. Dsp based simulator for speed control of the synchronous. A reluctance motor is a type of synchronous electric motor. This book offers an essential compendium on the analysis and design of synchronous motors for variablespeed applications. The rediscovery of synchronous reluctance and ferrite. Controller design for synchronous reluctance motor drive. Permanent magnet synchronous reluctance motor is one among the family of brushless ac machines. The paper focuses on studying the externalrotor synchronous reluctance motor.
The lowspeed torque capability is compared with that of an induction motor, a switched reluctance motor, and a brushless dc pm motor of identical size and copper weight. These steps are design optimization of the motor, identification of the motor parameter and implementation of an advanced control system to ensure optimum operation. Jun 11, 2017 the operation of the synchronous induction motor is explored in this video. Automated design of rotor topology for synchronous reluctance machines considering motor control strategies m. Up to 94% efficiency, much more efficient than acim alternate current induction motor machine in all speed. Focusing on synchronous reluctance and ferrite permanentmagnet pm synchronous reluctance machines, it provides a broad perspective on threephase machines for variable speed applications, a field currently dominated by asynchronous machines and rareearth pm synchronous. Design and optimisation of a linestart synchronous. As an integrated drive system, the reluctance motor and inverter are carefully coordinated and enable a particularly economical operation. Synchronous reluctance motor ideal for pumphydraulic applications.
Synchronous reluctance motor electric motor rotating machines. Permanent magnet assisted synchronous reluctance motor. Design of a synchronous reluctance motor drive abstract. Then combine them with a bestinclass industrial drive loaded with new, purposedesigned software.