Pdf maximum torque per ampere control of interior permanent. Then, the shape and the orientation of the permanent magnets in the interior permanent magnet motor are optimized by the proposed procedure to decrease the loss and to increase the torque. Interior permanent magnet ipm synchronous motors possess special features for adjustablespeed operation which distinguish them from other classes of ac machines. An external stator means fewer permanent magnets but poor use of winding, whereas an external rotor is considered particularly. Fieldweakening performance of interior permanentmagnet. Pdf cogging torque reduction for interior permanent. Us8994304b2 method for controlling interior permanent.
Design of axialflux permanentmagnet lowspeed machines and performance comparison between radialflux and axialflux machines lappeenranta 2005 153 p. A design of interior permanent magnet synchronous motor for. Throughout the years hybrid electric vehicles hev require an electric motor which has high power density, high efficiency, and wide constant power operating region as well as low manufacturing cost. This paper describes a novel field weakening technology of ipmm interior permanent magnet motor for the extended torque control capability. Speed control of interior permanent magnet synchronous motor. Permanent magnets have not been used for electrical machines for a long time because the development of the permanent magnet materials was not mature until mid20th century. The amplifier has been fine tuned to the pm motor to reach optimum performance by its manufacturer. Because the efficiency of ipmsm is one of the important performance characteristic, the maximum torque per amperemtpa operating. Motivation of nedo projects rareearthfree electric motors are strongly demanded for mass production hevs and evs.
Cogging torque reduction of interior permanent magnet. Front motors in allwheel drive model 3 teslas are also induction motors. Interior permanent magnet synchronous motor ipmsm has been widely used in hybrid electric vehicles hevs since the high power density and e ciency. For ipm motors, on one hand, the magnetic bridges protect the permanent magnets from.
In this paper, a fractional slot concentrated winding interior permanent magnet synchronous motor pmsm with. The main design features and the results of tests carried out on a prototype of a 750 kw interior permanentmagnet ipm motor for ship propulsion are presented. The conventional reluctance approach is applied to the first two regions. Development and analysis of interior permanent magnet. Jan 31, 2017 servomotors are permanent magnet motors used for motion control applications. Loss minimization control of interior permanent magnet synchronous motor for electric vehicles lin li mechanical and electrical engineering college,jiaxing university,city of jiaxing, zhejiang province,china,email. These two ideas are segmented pm rotor and modi ed the rotor structure based on polearc ratio of ux barrier optimization. Interior permanentmagnet synchronous motors for adjustable. Interior permanent magnet synchronous motoripmsm have gained an increasing popularity in recent years for a variety of industrial applications, because of their high power density, high efficiency and possibility of flux weakening operation.
Nedo has started rare earthfree or half rare earth motor projects since 2008. Magnetic equivalent circuit model of interior permanent. They are robust high powerdensity machines capable of operating at high motor and inverter efficiencies over wide speed ranges, including considerable ranges of constantpower operation. These permanent magnets are included in the rotor assembly. Equivalent circuit analysis of interior permanent magnet. Interior permanent magnet synchronous motor ipmsm have gained an increasing popularity in recent years for a variety of industrial applications, because of their high power density, high efficiency and possibility of flux weakening operation. Like the more popular surface permanent magnet spm. With advantages like nearconstant power over a broad speed range and a magnet retaining design, ipm motors provide a. Loss minimization control of interior permanent magnet.
Permanent magnet dc motors are constructed out of a number of components. Abstractinterior permanentmagnet ipm synchronous motors possess special features for adjustablespeed operation which distinguish them from other. This paper investigates the influence of demagnetization. In recent years, however, the emerging hybrid vehicle market, and, to some extent rising rareearth magnet costs, have boosted demand for interior permanent magnet ipm motors. Pdf design and comparison of interior permanent magnet motor. Lappeenranta university of technology isbn 9522140295, isbn 9522140309 pdf, issn 14564491. Typically, in an interiorinternal permanentmagnet motor design, these motors are paired with a specific amplifier as part of a matched set to maximize performance. Powerflex 750series configuration with permanent magnet motors overview the powerflex 750series drives offer control of permanent magnet pm motors. The proposed method controls the magnitude of flux according to the speed and dc link voltage without losing the. Failure diagnosis for demagnetization in interior permanent. Permanentmagnet, reluctance, and induction motors compared it is possible to find superefficient highhorsepower motors but, at this point, many of. Interior permanent magnet synchronous machines show a good range of behaviours, which make these kinds of machines good candidates for an electromechanical energy conversion.
Understanding permanent magnet motor operation and optimized. Understanding permanent magnet motor operation and. This type of motor is used in the chevy bolt, the chevy volt, and the tesla model 3. Jun 03, 20 ipm is an interior permanent magnet with self sensing and gets efficiency comparable to pmsm at much lower cost. The exact design and materials vary with each type of motor and depend on the application and constraints, but several elements are common to most. The software tools utilised throughout this procedure are speed pcbdc and pcfea 7 for electromagnetic modelling, motor cad 8 for thermal modelling, autodesk inventor 9 for mechanical modelling.
The socalled interior permanent magnet ipm synchronous motor build with magnets displaced inside the rotor body represents an attractive solution for emerging applications, such as electric vehicles and domestic appliances. A short survey of significant as well as some incremental contributions in. A permanent magnet ac pmac motor is a synchronous motor, meaning that its rotor spins at the same speed as the motors internal rotating magnetic field. Modeling of the demagnetization fault are important in. The block uses the threephase input voltages to regulate the individual phase currents, allowing control of the motor torque or speed. However, in order to improve their accuracy in their torque responses, the cogging torque and torque ripple phenomena should be mitigated to obtain better performance of the machine. Modeling of interior permanent magnet synchronous motor. The permanent magnet volume is altered so as to mimic the effect of demagnetization. Nonlinear control of interior permanentmagnet synchronous motor. The main design features and the results of tests carried out on a prototype of a 750 kw interior permanent magnet ipm motor for ship propulsion are presented. Download fulltext pdf download fulltext pdf calculating the interior permanent magnet motor conference paper pdf available july 2003 with 542 reads.
Prior art date 20120612 legal status the legal status is an assumption. In this paper, the torque ripple of interior permanentmagnet synchronous motor ipmsm is reduced using combination of two separate ideas. Interior permanent magnet synchronous motor ipmsm adaptive genetic parameter estimation abstract interior permanent magnet synchronous motors ipmsms are receiving increased attention for high performance drive applications because of their high power density, high efficiency and flux weakening capability. The proposed method controls the magnitude of flux according to the speed and dc link voltage without losing the ability to regulate the command torque. Interior permanent magnet synchronous motor ipmsm, transient simulation technique and synchronous reference frame. A permanent magnet motor is a type of electric motor that uses permanent magnets rather than windings on its field. New field weakening technique for high saliency interior. Poleshoes are traditionally used to produce sinusoidal flux linkage and sinusoidal emf especially in the case of radial flux synchronous. The design of ac permanent magnet motors for electric. There are a few papers which studied losses in cw ipm machine 1416.
Modeling of interior permanent magnet synchronous motor using. In a permanent magnet synchronous motor where inductances vary as a function of rotor angle, the 2 phase dq equivalent circuit model is commonly used for simplicity and intuition. Typically, in an interior internal permanent magnet motor design, these motors are paired with a specific amplifier as part of a matched set to maximize performance. The interior pmsm block implements a threephase interior permanent magnet synchronous motor pmsm with sinusoidal back electromotive force. This paper improves an analytical model for interior permanentmagnet synchronous machine ipmsm by a magnetic equivalent circuit mec approach. Pdf traction motors play a critical role in electrified vehicles including electric, hybrid electric, and plugin hybrid electric vehicles. The interior pm controller block implements a torquebased, fieldoriented controller for an internal permanent magnet synchronous motor pmsm with an optional outerloop speed controller. Threephase interior permanent magnet synchronous motor. Position and current control of an interior permanentmagnet. Loss minimization control of interior permanent magnet synchronous motor for electric vehicles lin li mechanical and electrical engineering college,jiaxing university,city of jiaxing. Modern high efficiency interior permanent magnet ipm motor drives. Introduction pm synchronous motors are now very popular in a wide variety of industrial applications. Permanentmagnet, reluctance, and induction motors compared it is possible to find superefficient highhorsepower motors. In addition, the torque ripple is decreased due to the reluctance torque component.
With advantages like nearconstant power over a broad speed range and a magnet. We are an interior permanent magnet motor manufacturer our ipm motors transform vehicles and machines globally proud to be global based just outside exeter, devon uk reduced packaging constraints reduced cost of ownership ashwoods ipm motor bene. Servomotors are permanent magnet motors used for motion control applications. Pdf interior permanentmagnet motor for ship propulsion.
Sensorless vector control of ipm ensures better performance at low speeds, smoother operation, and position control possible. Extended torquespeed region sensorless control of interior. Threephase interior permanent magnet synchronous motor with. Other tesla models use traditional induction motors.
Conference paper pdf available september 2018 with. Pdf electromagnetic design of an interior permanent magnet. The difference in motor operation, as the name suggests, is the existence of permanent magnets. However, the primary drawback of ipmsm is the demagnetization phenomenon caused by the permanent magnets. Pdf axial flux interior permanent magnet synchronous.
Formulation is mainly for interior permanent magnet synchronous motors but can also be applied to surface permanent magnet motors. Because the efficiency of ipmsm is one of the important performance characteristic, the maximum torque per amperemtpa operating method has been. For these purposes, a new interior permanent magnet synchronous motor ipmsm with brushless field excitation bfe is designed and. Nonlinear control of interior permanent magnet synchronous motor. Powerflex 750series configuration with permanent magnet.
Interior permanentmagnet motor for ship propulsion, design and testing zarko damir epe 2009 barcelona isbn. History of high efficiency permanent magnet motor technology using nonrare earthferrites and rare earth ndbfe. Control engineering understanding permanent magnet motors. Download fulltext pdf download fulltext pdf calculating the interior permanentmagnet motor conference paper pdf available july 2003 with 542 reads.
A large majority of them are constructed with the permanent magnets mounted on the periphery of the rotor core. Did you know that the investment cost of a pump only accounts for 5% of the total cost of ownership. Position and current control of an interior permanent. Analytical calculation of d and qaxis inductance for. This paper investigates the diagnosis of very slight pm demagnetization. We are ashwoods electric motors vision a global innovator that respects no limits we are an interior permanent magnet motor manufacturer our ipm motors transform vehicles and machines globally proud to be. The principal reasons for choosing an ipm motor design over other available types of. On the other hand, they provide a path for the permanentmagnet leakage. They are robust high powerdensity machines capable of operating at high motor and inverter efficiencies over wide speed ranges, including considerable ranges of constant. The software tools utilised throughout this procedure are speed pcbdc and pcfea 7 for electromagnetic modelling, motorcad 8 for thermal modelling, autodesk inventor 9 for mechanical modelling. A new permanent magnet design for axial flux interior permanent magnet afipm motor is described in this paper. Over the last decade, there have been numerous progresses in the devel.
For decades, surface permanent magnet spm motors dominated the market for permanent magnet motors. Whats the difference between ac induction, permanent magnet. The powerflex 755 offers both surfacemounted permanent magnet spm and interior permanent magnet ipm motor control. A single representative rotor assembly with permanent. Fieldweakening performance of interior permanentmagnet motors wen l. Electromagnetic design of an interior permanent magnet motor for vehicle traction. Interior permanentmagnet ipm synchronous motors possess special features for adjustablespeed operation which distinguish them from other classes of ac machines. Whats the difference between ac induction, permanent. The internal torque control implements strategies for achieving maximum torque per ampere mtpa and weakening the magnetic flux. Brief introduction to the emergence of high efficiency interior permanent magnet ipm synchronous motors. Procedure for optimization of interior permanent magnet. Since a high degree of reliability is necessary for permanent magnet synchronous motors, the detection of a precursor for the demagnetization of permanent magnets is very important.
Index termsflux weakening, ipmsm, outer voltage regula tion loop. The proposed mec model consists of three major regions. Ipm is an interior permanent magnet with self sensing and gets efficiency comparable to pmsm at much lower cost. I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the requirements for the degree of doctor of philosophy, with a major in electrical. Permanent magnet motor operation the stator windings on a permanent magnet motor are similar to those shown in figure 1.
Characterization of interior permanent magnet synchronous motors. For decades, surface permanentmagnet spm motors dominated the market for permanent magnet motors. Interior permanent magnet synchronous motor ipmsm adaptive. Design space methodology and its application in interior. New field weakening technique for high saliency interior permanent magnet motor abstract. Soong, member, ieee, and nesimi ertugrul, member, ieee abstract this paper compares the fieldweakening performance under rated and overload conditions of synchronous reluctance and interior permanentmagnet motors against that of a baseline 2. Us8994304b2 us653,543 us2012653543a us8994304b2 us 8994304 b2 us8994304 b2 us 8994304b2 us 2012653543 a us2012653543 a us 2012653543a us 8994304 b2 us8994304 b2 us 8994304b2 authority us united states prior art keywords voltage circumflex over dq command. This document contains methodologies for the proper test and setup of pm motors with the powerflex 755 drive, using pm flux vector fv mode, and the powerflex 750series drives using ipm fv mode.
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