Motor runs at slip speed reluctance torque, trel reluctance torque, trel maximum reluctance torque, trelmax occurs at. The advantages of sripm motor come from its hybrid nature of torque generation. In principle, the synchronous reluctance motor is similar. The reluctance motor has basically two main parts called stator and rotor. Synchronous reluctance motors synrms have become prominent since the rotor does not have any conductor or any permanent magnet. 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 very good overview of sensorless methods for determining the rotor position of switched reluctance motors is given in ray.
To achieve this a suitable theoretical model is essential, thus a simple but complete motor model is developed. The rotor is basically a piece of laminated steel and its shape forms. 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. Rotor design of linestart synchronous reluctance motor to improve starting performance seunghyoung ha1, jungpyo hong1, jiyoung lee1, hyuk nam2, gyuhong kang3 dept. Reluctance motor technical seminar report annual year 2014, electrical and electronics department, sdmt, ujire574240 page 1 chapter 1 introduction first time reluctance motors is mostly used by davidson as a traction drive for an electric. The operation of reluctance motor with diagram a media to. Synchronous reluctance motor is a true ac motor synchronous reluctance motors were developed to. 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. In terms of efficiency and power density, synchronous reluctance motors synrms represent a major step forward in sustainable electric motor technology. Switched reluctance motor for electric vehicles blog.
A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. Rotor design of linestart synchronous reluctance motor to. Sr motor principle and related torque general equation. The synchronous reluctance motor is an electrical rotating machine that converts the electrical power into mechanical power. 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. Reluctance motors operate on the principle that forces are established that tend to cause iron poles carrying a magnetic flux to align with each. Switched reluctance motors the structure of a switched reluctance motor is shown below. Pdf study of the synchronous reluctance motor design. Study of the synchronous reluctance motor design article pdf available in latvian journal of physics and technical sciences 534 september 2016 with 1,885 reads how we measure reads. The rotor has neither windings nor permanent magnets. The force tends to align the specimen of the material in such a. Theory of synchronous reluctance motor the synchronous reluctance motor is a threephase electric motor without permanent magnets and with a magnetically anisotropic rotor structure. Variable reluctance motors or steppers actually use rotors like those in figure below.
Pdf design of synchronous reluctance motor for hybrid. The stator poles have concentrated winding rather than sinusoidal winding. The switched reluctance motor srm is a type of stepper motor, an electric motor that runs by reluctance torque. Switched reluctance motor for electrical drives offor. The analysis is performed to estimate the influence of the number of stator slots and nonmagnetic areas in the rotor. The synchronous reluctance motor synrm has been studied. Synchronous reluctance motor intoduction concepts youtube. Apr 02, 2014 the torque ripple is an inherent drawback of switched reluctance motor drives. In order to understand the working of synchronous reluctance motor, when a piece of magnetic material is located in a magnetic field, a force acts on the material tending to bring it into the desert portion of the field.
With continued research, different topologies have emerged presenting less torque ripple, high efficiency, high. Torque is generated through the phenomenon of magnetic reluctance. 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. This greatly simplifies mechanical design as power does not have to be delivered to a moving part, but it complicates the. Electric drives brushless dc and reluctance motors. Switched reluctance motor srm the switched reluctance motor was designed for use in high power, high efficiency, variable speed drives. Unit 1 synchronous reluctance motors constructional.
Sr motors require precise control to optimise the operating efficiency. The paper deals with the design of a synchronous reluctance motor suited for hybrid electric vehicles. Permanent magnet synchronous reluctance motor design. The stampings are slotted on its periphery to carry the winding called stator winding. To develop positive torque, the currents in the phases of a srm must be to the rotor position. The structure of reluctance motor is same as that of salient pole synchronous machine as shown in fig. In practice, an ie5 motor has 20% less losses compared to an ie4 motor. 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 paper focuses on studying the externalrotor synchronous reluctance motor. Model the dynamics of switched reluctance motor simulink. This is a 4phase machine with 4 stator pole pairs and 3 rotorpole pairs 86 motor. In recent year pmsrm is experiencing a growing interest in variable speed applications. Synchronous reluctance motor is designed for high power applications. Jun 11, 2017 the operation of the synchronous induction motor is explored in this video. The operation of the synchronous induction motor is explored in this video.
Analytical design of a synchronous reluctance motor srm. The analysis is performed to estimate the influence of. There are no windings or permanent magnets on the rotor. The advantages of the synchronous reluctance motor ee. The synchronous reluctance motor is not self starting without the squirrel cage. It generates torque on the principle, that any unmagnetised magnetic material will try to align itself along the path of least magnetic reluctance path. Switched reluctance motor for electrical drives offor electrical drives electric power plants equipment vladimir kuzmichev mpeitu, orgres. Switched reluctance motor srm drives are simpler in construction compared to induction and synchronous machines.
Reluctance motor a single phase synchronous reluctance motor is basically the same as the single cage type induction motor. Synchronous reluctance motor electrical components. This paper investigates the influence of various electrical steel grades on the torque and efficiency of synchronous reluctance motors synrms. V zakharov and others published synchronous reluctance motor. One form of reluctance motor is shown in cross section in the figure. Here we will discuss construction and working principle of reluctance motor. 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. Pdf efficiency analysis of synchronous reluctance motors. The stator has a laminated construction, made up of stampings. 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. Their combination with power electronic controllers may yield an economical solution. Pdf the paper focuses on studying the externalrotor synchronous reluctance motor. A variable reluctance motor intended to move in discrete steps, stop, and start is a variable reluctance stepper motor.
Index items permanent magnet, synchronous reluctance motor design and finite element method. Switched reluctance motor drives electric equipment. The load inertia should be within the limits, for proper effectiveness. Oct 26, 2012 the threephase synchronous reluctance motor synrm is presented as a possible alternative in allelectric ship applications. Jan 06, 2016 switched reluctance motor drives the switched reluctance drive was developed in the 1980s to over advan tages in terms of eyciency, power per unit weight and volume, robustness and operational xexibility. Permanent magnet synchronous reluctance motor is one among the family of brushless ac machines. The basic features of this motor with regard to the other types of motors are shown. Synchronous reluctance motordrive package for machine. Unlike common dc motor types, power is delivered to windings in the stator case rather than the rotor.
If smooth rotation is the goal, there is an electronicdriven version of the switched reluctance motor. Jul 30, 2017 a reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. It can broadly be classified into axially laminated and radially laminated. We know about different types of synchronous motors, apart from all these motor works based on reluctance. The stator of the motor has the main and auxiliary winding. Reluctance motor subtypes include synchronous, variable, switched and variable stepping. Abb synchronous reluctance motors received the prestigious award automation award in germany. 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. Allows motor to motor comparison in the ie class level, even with advanced technology motors for vsd use. 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. The rotor is basically a piece of laminated steel and its shape forms salient poles.
During run up it behaves as an induction motor but as it approaches synchronous speed, the reluctance torque takes over and the motor locks into synchronous speed. The following figure shows the ideal waveforms phase a inductance and current in a 64 srm. Synchronous reluctance motor electric motor rotating machines. It is the motor driven by reluctance torque which is produced due to tendency of the salient rotor poles to align them. Before being produced the 1612 switched reluctance motor was optimised and calculated with a finite. If the rotating field of a large synchronous motor with salient poles is deenergized, it will still develop 10 or 15% of synchronous torque. A reluctance motor is a type of synchronous electric motor. The motor and its associated powerelectronic drive must be designed as an integrated package, and optimised for a particular speciwcation, e. 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 switched reluctance sr motors. 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. The first time the ie5 class has been officially defined. Define the characteristics of synchronous reluctance motor. The stator of the single phase reluctance and induction motor are same.
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