Design of a Low-Torque-Ripple Fractional-Slot Interior Permanent-Magnet Motor

Alberti, Luigi; Barcaro, Massimo; Bianchi, Nicola

doi:10.1109/tia.2013.2285954

Cited by 69 publications

(26 citation statements)

References 19 publications

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“…Another way of cancellation of a specific current linkage harmonic in a TC-PMSM is usage of multi-layer (> 2) windings as it is done in [17]. However, the winding construction becomes much more complicated as number of interconnections between winding coils increases.…”

Section: A Cogging Torquementioning

confidence: 99%

Torque ripple reduction in double-layer 18/16 TC-PMSMs by adjusting teeth widths to minimize local saturation

Ponomarev

Petrov

Pyrhönen

2014

2014 International Conference on Electrical Machines (ICEM)

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The saturation in the stator teeth of an 18-slots 16-poles TC-PMSM with sinusoidal current supply caused by the interaction of armature reaction fluxes and rotor-PM-produced fluxes is studied. It is found that under load some teeth are saturated deeper than others. An increase in the width of these teeth reduces the oversaturation, which locally prevents the decrease in the inductance and back-EMF, and, consequently, reduces the torque ripple in the machine. The proposed technique can also be applied to other types of TC-PMSMs.

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Section: A Cogging Torquementioning

confidence: 99%

Torque ripple reduction in double-layer 18/16 TC-PMSMs by adjusting teeth widths to minimize local saturation

Ponomarev

Petrov

Pyrhönen

2014

2014 International Conference on Electrical Machines (ICEM)

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“…The saliency ratio is defined in [8] as the ratio of the negative sequence amplitude over the positive sequence amplitude. The saliency ratio equation is as in (13) [8], [9]. The saliency ratio is thus a parameter greater than zero that allows the machine saliency to be characterised on a per unit scale.…”

Section: Saliency Ratio and Saliency Shiftmentioning

confidence: 99%

“…The specifications of this machine are summarised in Table I as drive 1. The saliency ratio and saliency shift of this machine are calculated with JMAG at various operating points on the maximum torque per ampere current angle curve with equations (12) and (13). The saliency ratio and saliency shift of the RSM is also measured to verify the FE results.…”

Section: Saliency Performance Of a Hev Rsm Drivementioning

confidence: 99%

“…Skewing of the FI-PM machine on the other hand can increase manufacturing complexity. An alternative method of torque ripple reduction is proposed in [12] and [13] where the rotor of a RSM, a PM assisted RSM and an IPM machine are designed asymmetric to the reduce torque ripple. This rotor design is referred to as a butterfly rotor in [12].…”

Section: Introductionmentioning

confidence: 99%

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Saliency performance investigation of synchronous machines for position sensorless controlled EV drives

Villet

Prins

Vorster

et al. 2013

2013 IEEE International Symposium on Sensorless Control for Electrical Drives and Predictive Control of Electrical Drives and P

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In this paper a per unit scale saliency-and saliency shift equation are used to predict the saliency based position sensorless control performance of synchronous machines for EV drives by means of a finite element package. These equations are used in a comparative study of various types of synchronous machines. The machine drives investigated and compared are a reluctance synchronous machine (RSM) hybrid EV drive and two variable gear RSM EV drives. Also included in the investigation are two field intensified permanent magnet (FI-PM) EV drives with asymmetric rotors, one FI-PM machine with a symmetric rotor and one field weakening interior permanent magnet drive. The saliency shift of the different FI-PM machine rotor topologies are also investigated. Closed loop saliency based position sensorless control shows startup torque capabilities of up to 304 Nm of a 32 kW 6-pole RSM. The RSM EV machine is used to investigate possible design modifications to improve on the saliency ratio and shift of synchronous machines. Index Terms-Position sensorless control, EV drives. NOMENCLATURE AND DEFINITIONS Symbols: u, i, ψ Voltage current and flux linkage r, L Resistance and inductance T m , Θ Mechanical torque and inertia T ripple Torque ripple f Machine frequency φ Current angle θ r , ω r Rotor-angle and speed θ e , ω e Electrical-rotor angle and speed Δ, Σ Difference and sum Indices: s, r Stator and rotor α, β Stator fixed cartesian axes d, q Rotor fixed direct and quadrature axes c Carrier frequencyScalar values are written in normal letters, e.g. R or τ , vector values are written in small bold letters, e.g. i or ψ. Subscripts describe the location of the physical quantity, e.g. r s is the stator resistance. Superscripts specify the reference frame of the quantity, e.g. i r s is the stator current vector in the rotor reference frame. Estimated quantities are indicted with a hat, e.g.θ e . Small signal values are represented with δ.

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“…Using this method, they successfully decreased the cogging torque to be less than 1%. Another approach involved using a multilayer structure for stator windings and changing the rotor geometry (Alberti et al, 2014). The authors reported a torque ripple lower than 1.5% at full load.…”

Section: Introductionmentioning

confidence: 99%

Edge-rounded Magnet Poles for Reducing the Torque Ripple on a Radial Flux Inset Permanent Magnet Generator

Handini

Setiabudy²,

Gunawan³

et al. 2018

IJTech

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This study reports a novel strategy for minimizing torque ripple in a radial flux inset permanent magnet (RFIPM) generator by using a geometric modification of the magnet poles. We simulate the design of three different types of edge-rounded magnet (ERM) poles using finite element method magnetics (FEMM) software for a 16 poles and 24 slots RFIPM generator. We found that the edge-rounding of magnet poles significantly lowered the torque ripple of the generator with a reduction of about 74% (torque ripple of 7.76%). In addition, the modified RFIPM generator exhibited enhanced flux density uniformity in the air-gap of the generator (up to ~ 48.8%), leading to a smoother line of flux density.

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Design of a Low-Torque-Ripple Fractional-Slot Interior Permanent-Magnet Motor

Cited by 69 publications

References 19 publications

Torque ripple reduction in double-layer 18/16 TC-PMSMs by adjusting teeth widths to minimize local saturation

Torque ripple reduction in double-layer 18/16 TC-PMSMs by adjusting teeth widths to minimize local saturation

Saliency performance investigation of synchronous machines for position sensorless controlled EV drives

Edge-rounded Magnet Poles for Reducing the Torque Ripple on a Radial Flux Inset Permanent Magnet Generator

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