Air-Barrier Width Prediction of Interior Permanent Magnet Motor for Electric Vehicle Considering Fatigue Failure by Centrifugal Force

Kim, Sungjin; Jung, Sang-Yong; Kim, Yong-Jae

doi:10.5370/jeet.2015.10.3.952

Cited by 6 publications

(4 citation statements)

References 16 publications

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“…N ti represents the number of cycles until failure for the corresponding stress cycle, and n ti represents the number of times the stress cycles occur in the transient stress cycle. Damage from the pulsating stress cycle is also calculated using the same approach as shown in (5). Here, D p represents the damage due to the pulsating cycle, n p represents the number of times the pulsating cycles to be repeated to attain the equivalent damage, and N p represents the number of cycles until failure for the pulsating stress cycle.…”

Section: Equivalent Damage Calculation For Constant Amplitude Load Cyclementioning

confidence: 99%

“…However, an increase in the motor's maximum speed might have an undesirable effect on the rotor's structural integrity because the stresses on the rotor increase quadratically with rotor speed. It might lead to a conflicting performance between the structural and electromagnetic requirements for the design of the rotor bridges and air flux barriers [5]. A thinner bridge improves the torque performance but also increases the stress.…”

Section: Introductionmentioning

confidence: 99%

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Rotor Fatigue Life Calculation Using Constant-Amplitude Load Cycles for an Interior Permanent Magnet Synchronous Motor

Kumar Sahu,

Haddad,

Al-Ani

et al. 2024

IEEE Access

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Interior Permanent Magnet Synchronous Motors (IPMSM) are widely used as traction motors today because they can deliver high torque at low speeds, and high efficiency at low-and medium-speed ranges. Air flux barriers and bridges of an IPMSM have contradictory electromagnetic and structural requirements. The rotor undergoes a fluctuating load due to varying speeds in a drive cycle. Designing the rotor with the yield strength as a design criterion might not be sufficient. Fatigue life should be evaluated considering the mean value and amplitude of the fluctuating load profile, and the acceptance criteria should be derived based on field operations. This paper proposes a constant amplitude load cycle as an accelerated fatigue analysis approach for an IPMSM rotor and presents a fatigue analysis workflow considering the thermal and mechanical loads. It also presents the loads and boundary conditions for rotor stress analysis and the effect of elastic and elastic-plastic material properties on stress calculation.

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Section: Equivalent Damage Calculation For Constant Amplitude Load Cyclementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rotor Fatigue Life Calculation Using Constant-Amplitude Load Cycles for an Interior Permanent Magnet Synchronous Motor

Kumar Sahu,

Haddad,

Al-Ani

et al. 2024

IEEE Access

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show abstract

“…However, a higher motor speed can also have a damaging effect on the IPMSM rotor because the centrifugal load is quadratically proportional to the speed. An IPMSM usually requires a thinner rotor bridge to improve torque performance, but it leads to an increase in stress at the rotor bridges [4]. The rotor is also affected by electromagnetic, thermal, and other mechanical loads.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Rotor Fatigue of an Interior Permanent Magnet Synchronous Motor

Sahu,

Haddad,

Al-Ani

et al. 2024

Machines

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Interior permanent magnet synchronous motors (IPMSMs) are extensively used as traction motors today because of their exceptional torque, power density, and wide, constant power operating range. Under real-world usage, an IPMSM rotor undergoes varying electromagnetic, thermal, and mechanical loads. Under such conditions, fatigue life-based design criteria should be used over stress-based design criteria to ensure the structural integrity of the rotor. Moreover, the driving dynamics can change the rotor temperature continuously, which affects the electromagnetic, mechanical, and fatigue properties of the rotor material. This paper proposes a robust thermomechanical rotor fatigue simulation workflow considering significant loads acting on an IPMSM rotor and the temperature variation throughout a drive cycle. It discusses an accelerated fatigue life estimation approach based on the peak valley extraction method to reduce the simulation time significantly for the stress and fatigue analysis. Then, it presents a method for a stress-life curve generation for variable loading. It also presents a sensitivity study with a median S-N curve, and a 90% reliability and 95% confidence (R90C95) S-N curve.

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“…Moreover, improving the power density of the electric motor would appear to increase the overall efficiency of the vehicle because the weight of the electric motor weight is more important than that of conventional vehicles [5]- [7].…”

Section: Introductionmentioning

confidence: 99%

Range Extension of Light-Duty Electric Vehicle Improving Efficiency and Power Density of IPMSM Considering Driving Cycle

Dong-min¹,

Jung²,

Lim³

et al. 2016

The Transactions of The Korean Institute of Electrical Engineer

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-Recently, the trend of zero emissions has increased in automotive engineering because of environmental problems and regulations. Therefore, the development of battery electric vehicles (EVs), hybrid/plug-in hybrid electric vehicles (HEVs/PHEVs), and fuel cell electric vehicles (FCEVs) has been mainstreamed. In particular, for light-duty electric vehicles, improvement in electric motor performance is directly linked to driving range and driving performance. In this paper, using an improved design for the interior permanent magnet synchronous motor (IPMSM), the EV driving range for the light-duty EV was extended. In the electromagnetic design process, a 2D finite element method (FEM) was used. Furthermore, to consider mechanical stress, ANSYS Workbench was adopted. To conduct a vehicle simulation, the vehicle was modeled to include an electric motor model, energy storage model, and regenerative braking. From these results, using the advanced vehicle simulator (ADVISOR) based on MATLAB Simulink, a vehicle simulation was performed, and the effects of the improved design were described.

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Air-Barrier Width Prediction of Interior Permanent Magnet Motor for Electric Vehicle Considering Fatigue Failure by Centrifugal Force

Cited by 6 publications

References 16 publications

Rotor Fatigue Life Calculation Using Constant-Amplitude Load Cycles for an Interior Permanent Magnet Synchronous Motor

Rotor Fatigue Life Calculation Using Constant-Amplitude Load Cycles for an Interior Permanent Magnet Synchronous Motor

Thermomechanical Rotor Fatigue of an Interior Permanent Magnet Synchronous Motor

Range Extension of Light-Duty Electric Vehicle Improving Efficiency and Power Density of IPMSM Considering Driving Cycle

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