On the design of high-performance surface-mounted PM motors

Slemon, G.R.

doi:10.1109/28.273631

Cited by 71 publications

(53 citation statements)

References 4 publications

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“…Iron loss is one of important portion of losses in high speed applications [2][3][4][5]. Iron losses depend on the flux density waveform in different parts of the machine and there are many tools for iron loss calculation in the machines such as classical formulations [6][7], analytical solutions [8], magnetic equivalent circuit [9][10], and finite element (FE) solutions [11][12][13][14][15][16][17][18]. The difference in these methods is the way of calculating flux density in the motor and all of them then use common formulation for iron loss calculation.…”

Section: Introductionmentioning

confidence: 99%

Iron loss calculation and 3-D thermal analysis of Halbach array permanent magnet synchronous motor

Sadeghi¹,

Isfahani

Sedghisigarchi

2015

2015 International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles (ESARS)

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This paper presents the thermal analysis of a fivephase Halbach array permanent magnet synchronous machine. The iron loss is calculated using a hybrid analytical finite element method with segmenting the stator into six parts. The proposed method is compared with both conventional method and pure finite element method. The results show that the proposed technique is accurate whereas it is more simple and time efficient than pure finite element analysis. Higher harmonics losses are also taken into account in the presented technique. Joule losses including end winding loss and also permanent magnet eddy current loss are then calculated and used in a 3-D thermal analysis by finite element method. Thermal distribution and hot spots are determined and a water based cooling system is finally designed for the motor in the worst-case scenario to keep the magnet temperature in a safe range.

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Section: Introductionmentioning

confidence: 99%

Iron loss calculation and 3-D thermal analysis of Halbach array permanent magnet synchronous motor

Sadeghi¹,

Isfahani

Sedghisigarchi

2015

2015 International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles (ESARS)

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“…In the paper by G.R. Slemon [78] parameters of surface-mounted PM machines were correlated with respect to physical and technological constraints. The paper derived general approximate expressions for acceleration and torque limits.…”

Section: Speed Limits Of Pm Machinesmentioning

confidence: 99%

“…Using the simple form (3.73), the flux density in the eccentric rotor machine can be estimated as: 78) or using the permeance function f cm obtained from conformal mapping [108]:…”

Section: Unbalanced Magnetic Pull and Machine Stiffnessmentioning

confidence: 99%

Limits, Modeling and Design of High-Speed Permanent Magnet Machines

Borisavljevic¹

2013

Springer Theses

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“…In the following paragraphs, the influence of magnet mass in the design of fractional slot PMSM's is studied, taking into account the above mentioned aspects and design considerations of [4] and [14]. In addition, several modelling techniques exist, such as magnetic equivalent network based techniques [15], or exact analytical models for a surface PMSM [16].…”

mentioning

confidence: 99%

Influence of the Amount of Permanent-Magnet Material in Fractional-Slot Permanent-Magnet Synchronous Machines

Sergeant

Bossche

2014

IEEE Trans. Ind. Electron.

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Abstract-The efficiency of permanent magnet synchronous machines (PMSM) with outer rotor and concentrated windings is investigated as a function of the mass of magnets used, keeping the power, volume and mechanical air gap thickness constant. In order to be useful for electric vehicle motors and wind turbine generators, the efficiency is computed in a wide speed and torque range, including overload. For a given type and amount of magnets, the geometry of the machine and the efficiency map are computed by analytical models and finite element models, taken into account iron loss, copper loss, magnet loss and pulse width modulation loss. The models are validated by experiments. Furthermore, the demagnetization risk and torque ripple are studied as a function of the mass of magnets in the machine. The effect of the mass of magnets is investigated for several soft magnetic materials, several combinations of number of poles and number of stator slots, and for both rare earth (NdFeB) magnets and ferrite magnets. It is observed that the amount of permanent magnet material can vary in a wide range with a minor influence on the efficiency, torque density, and torque ripple and with a limited demagnetization risk. A lot of papers deal with rotor losses in the considered type of machines, and give methods to compute them. For example [6] gives a general method for several slot/pole configurations. Polinder [7] studies losses in the solid back iron of PMSM with fractional slot windings. Atallah presented an analytical model to compute magnet loss [8], and Ede proposed a computationally efficient 3D numerical method to compute the magnet loss [9]. IndexAn aspect of fractional-slot concentrated-winding PMSM's that is less investigated, is how much the amount of magnets can be reduced, and how this affects the global machine design and performance. As the price of rare earth magnets is high, PMSM's with small amount of magnets become interesting, on condition that their efficiency and torque density remain high. It is known that very powerful and light permanent magnet machines can be made when a lot of PM material can be used: for example the slotless brushless DC PMSM of [10] has two concentric rotors, both of them completely covered with a thick layer of NdFeB magnets in Halbach array. Alternatives are investigated to reduce the required amount of permanent magnets, or even to have motors without magnets [11]. Nevertheless, [12] compared caged induction, reluctance, and PM motor technologies for the more electric aircraft, concluding that three-phase permanent magnet machines may still be the favorite choice.Therefore, we investigate the impact of the amount of magnets and the magnetic material grade in the stator of the PMSM on the efficiency, keeping the machine volume and torque density constant. Here, we consider not only the efficiency at nominal speed N nom and torque T nom , but also the average efficiency in the speed range 0.25-1.50×N nom and torque range 0.25-1.50×T nom . A number of effects of reducing the amount ...

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On the design of high-performance surface-mounted PM motors

Cited by 71 publications

References 4 publications

Iron loss calculation and 3-D thermal analysis of Halbach array permanent magnet synchronous motor

Iron loss calculation and 3-D thermal analysis of Halbach array permanent magnet synchronous motor

Limits, Modeling and Design of High-Speed Permanent Magnet Machines

Influence of the Amount of Permanent-Magnet Material in Fractional-Slot Permanent-Magnet Synchronous Machines

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