Switchedreluctance sr motor concept has been known since 1838. But the lack of semiconductors to rapidly switch current on and off and a limited supply of engineers with the technical knowledge. If the rotating field of a large synchronous motor with salient poles is deenergized, it will still develop 10 or 15% of synchronous torque. Design of a synchronous reluctance motor assisted with. Each synchronous reluctance motor drive package combines proven stator technology, an innovative magnetfree rotor design, a bestinclass industrial drive and advanced software to offer a complete, optimized solution. Synchronous reluctance ev motor avoids rare earths drives. Although the motor is rated at 75 kw, it can produce instantaneous power up to 125 kw, and torque up to 250 nm. 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.
Especially in comparison with conventional asynchronous technology, a synchronousreluctance drive system enables a very high level of efficiency in full and partial. Aircraft electric general electric motor design and construction discussion switched reluctance motor srm synchronous reluctance motor synrm thread tools nov 06, 2016, 08. Synchronous reluctance motors are increasingly being used in a wide range of. Stepper motor with center taps on twophase windings. Up to 94% efficiency, much more efficient than acim alternate current induction motor machine in all speed. Home introduction design model optimization simulation inverter study conclusions design goals. The authors examined the differences in motor characteristics based on how the magnets were embedded. Reluctance motor subtypes include synchronous, variable, switched and variable stepping. Up to 94% efficiency, much more efficient than acim alternate current induction motormachine in all speed. Design, optimisation and implementation of lowvoltage. Simulation is key to design of highefficiency, lowcost. The design of these motors combines the performance advantages of synchronous motors with the simplicity and ease of maintenance of an induction platform without permanent magnets. T he synchronous reluctance motor works better at lower loads 50% th a n induction motors and pm motors. The high efficiency of the synchronous reluctance drive system, consisting of simotics sd motors and sinamics s120 frequency converters, translates into a short payback period and quick roi, in addition to minimal operating costs and high energy efficiency.
In this research work, development of methods, algorithms, and software for the design of the synchronous reluctance motors synrm for. Keywords flux barriers, motor design, synchronous motors, reluctance motors. 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. 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 paper deals with the design of a synchronous reluctance motor suited for hybrid electric vehicles. Reluktance motors employ the magentic reluctance principle the natural attraction of an electromagnet to iron. Synchronousswitched reluctance motorgenerators srm have great potential for many applications which require rugged construction and high reliability at low cost such as wind turbine generators or tractive drive motors.
Torque, phase fluxlinkage and voltage, eddy current, and hysteresis losses were calculated using femm 4. Synchronous reluctance ev motor avoids rare earths. 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. Therefore, this dissertation first deals with the design optimization of the permanent magnet assisted synchronous reluctance motor pmasynrm. S ynchronous reluctance motor s work over a wider speed range. The figure shows the equivalent electrical circuit for the stator windings.
Synchronous reluctance motor synrm electromagnetic design. The block supports a second rotor axis definition for which rotor mechanical angle is defined as the angle between the aphase magnetic axis and the. We design each motor to its application so there is no compromise. Especially in comparison with conventional asynchronous technology, a synchronous reluctance drive system enables a very high level of efficiency in full and partial. A synchronousreluctance drive system operates at an astonishing level of energy efficiency and additionally offers greater power reserves than a comparable asynchronous drive. Design methodologyapproach a 24slot fourpole synchronous reluctance machine with overlapping windings and asymmetric fluxbarrier in the rotor is, first, described and designed by finite. 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 synchronous reluctance motor design. The new electric vehicle ev motor has been designed and built in prototype form by ricardo as part of a collaborative research and development project, rapidsr rapid design and development of a switched reluctance traction motor. Synchronous reluctance motors synrms are an alternative solution in lowcost applications due to some advantages in terms of manufacturing simplicity. Design of synchronous reluctance machines for automotive.
This study deals with a new design and implementation of a synrm so as to operate at lowvoltage level produced by solar panels without using any boostconverter. It generates torque on the principle, that any unmagnetised magnetic material will try to align itself along the path of least magnetic reluctance path. Modelling and control of synchronous reluctance motor 637489 ppt. Ricardo develops nextgeneration electric vehicle motor. Deliver high power at low cost using reluctance machines. Abb synchronous reluctance motor and drive package. 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. Reluktance motors employ the magentic reluctance principle the natural attraction of an electromagnet to. Designmethodologyapproach a 24slot fourpole synchronous reluctance machine with overlapping windings and asymmetric fluxbarrier in the rotor is. The synchronous reluctance motor is an attractive option for low torque applications requiring efficient operation. Recently, permanent magnet assisted pmasynchronous reluctance motors synrm have been considered as a possible alternative motor drive for high performance applications. A 2pole synchronous reluctance motor is shown in figure 2. This paper describes the high performance motor design of an interior permanent magnet synchronous motor ipm motor for electric vehicles. 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.
A technological and smart solution for ever increasing demand for high efficiency and cost reduction. Various key points in the rotor design of a low cost pmasynrm are introduced and their effects are studied. Motor analysis support tool, electric machine design toolkit, of ansys maxwell, performs in full automatic an efficiency map computation and speedtorque characteristic of a pm motor and realizes significant efficiency in development time by the function of displaying an efficiency map graph. Synchronous reluctance motors are increasingly being used in a wide range of industrial applications because of their unique combination of high efficiency, high power density and low manufacturing costs. The motor cad therm module is the industrystandard tool for thermal analysis of electric machines, with over 20 years of inbuilt experience. Reluctance motors can deliver high power density at low cost, making them. The machine design employs single tooth wound coils with short end windings and high fill factor, which facilitates the machines high torque density and efficiency. Sep 25, 2012 abb synchronous reluctance motor and drive package combines conventional stator technology, a new magnetfree rotor design and a topoftheline industrial drive together with new software. Permanentmagnetassisted synchronous reluctance motor. In order to have an efficient motor drive, performing of three steps in design of the overall drive is not avoidable.
Synchronousreluctance drive system drive technology topics. Rotor design of linestart synchronous reluctance motor to. The load inertia should be within the limits, for proper effectiveness. Synchronous reluctance motordrive package for machine. To achieve this a suitable theoretical model is essential, thus a simple but complete motor model is developed. Switched reluctance motor srm synchronous reluctance. A 4inch of standard frame size is chosen for as a submersible. Reluctance motors maccon develops and supplies both switched reluctance sr as well as synchronous reluctance syr motors.
You are supposed to design a synchronous reluctance motror for the bmw i3, which is a fullelectric car with a hybridsynchronous motor. Motorcad therm allows designers to calculate the temperature of the motor components in steadystate and transient operating conditions, enabling accurate modelling of thermal behaviour within seconds of calculation. T he highe s t performance torqu e density motor to date appears to be the mercedes benz i3 traction motor. You are supposed to design a synchronous reluctance motror for the bmw i3, which is a fullelectric car with a hybrid synchronous motor. Each synchronous reluctance motordrive package combines proven stator technology, an innovative magnetfree rotor design, a bestinclass industrial drive and advanced software to offer a complete, optimized solution. Jun 28, 2017 synchronous switched reluctance motor generators srm have great potential for many applications which require rugged construction and high reliability at low cost such as wind turbine generators or tractive drive motors. Maccon develops and supplies both switched reluctance sr as well as synchronous reluctance syr motors. Analytical design of a synchronous reluctance motor srm pag. Thus, unbalanced starting torque can be caused by depending on initial starting position. The motorcad therm module is the industrystandard tool for thermal analysis of electric machines, with over 20 years of inbuilt experience. About 97% of the life cycle costs account for the energy costs for motors. Synchronous reluctance motor ideal for pumphydraulic applications.
Mar 10, 2015 this tutorial is intended to show you how to model a reluctance motor and calculate the magnetic field and current in the stranded coils. Synchronous reluctance machine with sinusoidal flux. A reluctance motor is a type of electric motor that induces nonpermanent magnetic poles on the ferromagnetic rotor. Switched reluctance machine multiphase four or fivephase switched reluctance machine srm synchronous reluctance machine. For the axes convention shown, when rotor mechanical angle. Rotor design of linestart synchronous reluctance motor to improve starting performance seunghyoung ha1, jungpyo hong1, jiyoung lee1, hyuk nam2, gyuhong kang3 dept. In synchronous reluctance motor, the excitation winding does not exist. Analytical design of a synchronous reluctance motor srm. Design and optimisation of a linestart synchronous. Syre is a matlaboctave code developed to design synchronous reluctance machines. Stepper motor suitable for whole, half and microstepping representation. Permanent magnet assisted synchronous reluctance motor.
Recently, permanent magnet assisted pma synchronous reluctance motors synrm have been considered as a possible alternative motor drive for high performance applications. Design and optimisation of a linestart synchronous reluctance motor repository copy article. What are the applications of synchronous reluctance motor. The synchronous reluctance machine block represents a synchronous reluctance machine synrm with sinusoidal flux distribution. The prototype synchronous reluctance motor developed by a uk consortium since the rapidsr project started in 2012, it has been researching the design of nextgeneration electric motors that avoid the costly, and potentially difficulttosource, rareearth elements that are usually needed for highpower permanent magnets.
Evaluating motor geometries and configurations at system design allows efficient development with less rework. Synchronous reluctance machine with sinusoidal flux distribution. 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. Motor cad therm allows designers to calculate the temperature of the motor components in steadystate and transient operating conditions, enabling accurate modelling of thermal behaviour within seconds of calculation. The stator of the motor has the main and auxiliary winding. Home introduction design model optimization simulation inverter study conclusions finite element model. Provide precise motor positioning using stepper motors and stepper motor drivers. Reluctance motor a single phase synchronous reluctance motor is basically the same as the single cage type induction motor.
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. Switched reluctance sr motor concept has been known since 1838. Synchronous reluctance machine create the future design contest. This paper presents a rotor design of a lssynrm to improve. The stator has 30 slots, so each coil has a 180 degree pitch. The basis for the d q equations for a synchronous reluctance machine can be obtained. Synchronous reluctance motors synrms are an alternative.
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. Synchronousreluctance drive system drive technology. Pdf design of synchronous reluctance motor for hybrid. For this comparison, they set conditions so that the volume of magnets remained constant, and they. Abb synchronous reluctance motor and drive package combines conventional stator technology, a new magnetfree rotor design and a topoftheline industrial drive together with new software. The rotor of a reluctance motor is a squirrel cage with some rotor teeth removed in the certain places to provide the. It is usually assumed that windings of pmsrm are ributed sinusoidally. A synchronous reluctance drive system operates at an astonishing level of energy efficiency and additionally offers greater power reserves than a comparable asynchronous drive. 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. Finite element approach has been utilized to show the effects of these parameters on the. Design of a synchronous reluctance motor with nonoverlapping. Coupled with special rotor lamination design, these machines offer synchronous speed operation with a simple, low inertia rotating assembly construction. 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 designs are simulated using the latest software, prototyped and then tested using our range of dynamometers in combination with application specific testing in the customer application.
In order to have an efficient motor drive, performing of three steps. Motor design considerations and test results of an. The paper presents the design of a 4 poles, 20 nm, 400 v, 50 hz synchronous reluctance motor with four fluxbarriers. Abb synchronous reluctance motor and drive package technology. 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. Sr motor principle and related torque general equation. The diagram shows the motor construction with a single polepair on the rotor. The stator of the single phase reluctance and induction motor are same.
To calculate eddy current and hysteresis loss in the stator, i used the built in harmonic ac solver in femm 4. Whether designing an electric motor for an electric vehicle that needs to be small, efficient and quiet, or for an industrial application where size and sound are not of major concern, it is critical to simulate electric motors early in the design process. Synchronous reluctance motors process performance motors. Abstract this paper presents the detailed design and finite element study of a synchronous reluctance machine with a nonoverlapping fractional slot concentrated windings. Abb presented its range of synrm ultrapremium ie5 synchronous reluctance motors, designed to meet the needs of companies wishing to improve their energy efficiency and reduce co2 emissions. This tutorial is intended to show you how to model a reluctance motor and calculate the magnetic field and current in the stranded coils. Jmag accurately obtains electromagnetic and magnetostrictive forces, computes generated vibrations based on these forces, and further, obtains sound pressure distributions in surrounding areas. Widespread use of srms is limited because of magnetic circuit reluctance patterns that contribute to cogging torque. For the motor model, i simply used automatic meshing. The motor in this example has 4 phase and each phase has 2.
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