Reduction of permanent magnet eddy current loss in interior permanent magnet synchronous motor according to rotor design optimization

Lee, Tae-Yong; Kim, Yong-Jae; Jung, Sang-Yong

doi:10.1109/icpe.2015.7168008

Cited by 6 publications

(5 citation statements)

References 16 publications

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“…The main origin of magnet losses are eddy currents; hysteresis losses can be neglected [16,17]. Since eddy current losses are proportional to the square of frequency [18], magnet losses have to be considered, especially in high-speed operation, as can be seen in Figure 3. Also, eddy current losses are temperature-dependent, and are lower at increased temperatures [17].…”

Section: Magnet Lossesmentioning

confidence: 99%

Power Density Increase in Permanent-Magnet Synchronous Machines Considering Active Thermal Control

Monissen,

Kusche,

Schröder

et al. 2023

Energies

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The power density of electric machines for future battery electric vehicles must be further increased to improve customer benefits. To this end, this paper compares two state-of-the art electrical traction machines and evaluates the potential for increasing the power density using a third, novel high-speed machine design. The analysis is performed using an electromagnetic finite element analysis, a thermal network with lumped parameters, and a coupled electromagnetic–thermal simulation. The simulations of the three machines evaluate the potential for increasing the power density and overload margins, as well as reducing material consumption. With regard to the active thermal control, the new design aims for reduced thermal capacities and increased loss density to optimize the thermal controllablity and overall performance. The thermal active control is analyzed in thermal transient simulations and electromagnetic simulations with different magnet temperatures. The results show that higher magnet temperatures benefit efficiency and reduce losses for low torque at high speeds. However, a colder magnet is needed for maximum torque at base speed. A maximum loss reduction of 24% is achieved with a 100 °C magnet-temperature difference at maximum speed and low torque.

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Section: Magnet Lossesmentioning

confidence: 99%

Power Density Increase in Permanent-Magnet Synchronous Machines Considering Active Thermal Control

Monissen,

Kusche,

Schröder

et al. 2023

Energies

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“…The segmentation of permanent magnets is a known and described in the literature [12,13,15,16,23] method of reducing losses in magnets. This applies to both circumferential and axial segmentation.…”

Section: Segmentation Of Permanent Magnetsmentioning

confidence: 99%

Archives of Electrical Engineering

Wolnik,

Opach,

Cyganik

et al. 2022

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Fractional slot PMSM motors enable high power density factors to be obtained provided that their electromagnetic circuit, appropriate mechanical structure and cooling system are properly designed, as well as when operating at a high frequency of power supply voltage (400-800 Hz) with high magnetic saturation and high current loads (approx. 12-15 A/mm 2 ). Such operating conditions, especially in the case of fractional slot motors, may be the reason for excessive rotor losses, mainly in the rotor yoke and permanent magnets. One of the conditions for obtaining high values of continuous power of the motor is the reduction of these losses. This paper presents selected design methods for limiting the value of rotor losses with simultaneous consideration of their influence on other motor parameters. The analysis was carried out for a PMSM motor with an external rotor weighting approx. 10 kg and a maximum power of 50 kW at a rotational speed of 4 800 rpm.

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“…However, the PM division reduces production rates and increases prices. There are also many studies on the reduction of the eddy current loss of a PM through shape design of the rotor and the PM [19][20][21]. In most studies, the eddy current loss of the PM was directly calculated using 3-D FEA or an analytical method.…”

Section: Of 15mentioning

confidence: 99%

Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

et al. 2020

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We designed and analyzed an interior permanent magnet synchronous motor (IPMSM) to prevent irreversible demagnetization of the permanent magnets (PMs). Irreversible demagnetization of NdFeB PMs mainly occurs due to high temperature, which should thus be minimized. Therefore, it is necessary to reduce the eddy current loss in the PM through optimal design. The shape of the rotor core was optimized using finite element analysis (FEA) and response surface methodology. Three-dimensional (3-D) FEA is required for accurate computation of the eddy current loss, but there is huge time, effort, and cost consumption. Therefore, a method is proposed for indirectly calculating the eddy current loss of PMs using 2-D FEA. A thermal equivalent circuit analysis was used to calculate the PM temperature of the optimized model. For the thermal analysis, the copper loss, core loss, and eddy current loss in PMs were estimated and applied as a heat source. Based on the results, we confirmed the stability of the optimum model in terms of the PM demagnetization.

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Reduction of permanent magnet eddy current loss in interior permanent magnet synchronous motor according to rotor design optimization

Cited by 6 publications

References 16 publications

Power Density Increase in Permanent-Magnet Synchronous Machines Considering Active Thermal Control

Power Density Increase in Permanent-Magnet Synchronous Machines Considering Active Thermal Control

Archives of Electrical Engineering

Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

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