Magnetic Form of Heavy Rare-Earth Free Motor for Hybrid Electric Vehicle

Soma, Shingo; Shimizu, Haruhiko; Shirado, E.; Fujishiro, Satoshi

doi:10.4271/2017-01-1221

Cited by 13 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The research further showed the possibility of design either using sintered magnets or by means of the hot deformation process, which has made it possible to choose rare-earth-free products that have been on the market since 2017. (3) The application of this technology to electrification mobility can be expected to enable the realization of a reduction in magnet use and a reduction of supply and price risk. Beyond that, it may also lead to enhanced sustainability of rare earth resources.…”

Section: Summary/conclusionmentioning

confidence: 99%

“…(Figure. 2,3) Moreover, the selection of hot deformation processing made it possible to achieve a coercivity (Hcj) of 1500 kA/m, or higher without including heavy rare earths. If motors are designed with care regarding resistance to demagnetization, then this would contribute to the development of motors without the high cost risk and procurement risk of heavy rare earths.…”

Section: Introduction For Magnet Trendmentioning

confidence: 99%

“…The present research also addressed the magnetic flux barrier shape by creating a shape with a structure resistant to demagnetization in a way that would produce a motor that satisfies the specifications even without using heavy rare earths if a hot-deformed magnet is selected. (3)…”

Section: Introduction For Magnet Trendmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Form applying a C-Shaped Magnet for Hybrid Electric Vehicles

2022

Self Cite

View full text Add to dashboard Cite

Currently, electrification for vehicles such as battery electric vehicles (BEVs), plug in-hybrid electric vehicles (PHEVs), fuel cell electric vehicles (FCEVs), and hybrid electric vehicles (HEVs) has received considerable attention, owing to the urgent need to reduce CO2 emissions created from transportation and the energy dependency on crude oil. Honda has set a target whereby twothirds of total global sales should come from EVs by 2030. A traction motor is an essential component of electrified vehicles. Generally, interior permanent magnet synchronous motors (IPMSMs) are used as traction motors owing to their high torque and power density, high efficiency and ease of use. The design of rotors, which consist of magnets and electrical steel sheets, is important for IPMSMs because their average torque, efficiency, quietness, as well as cost depend on it. We have developed a novel rotor, which allows for a degree of freedom in the shape of the magnets. In the proposed rotor, first, the shape and position of the magnets are determined parametrically under manufacturing constraints. Then, the shape of the electrical steel sheet is determined by the ideal flux-line using maximized Lq-Ld. This involves combining q-axis flux and flux shape optimization for a practical design of the rotor. We also reduced torque ripple by considering the magnet position and dimple design. Rotors that are used in electrified vehicles are rotated at a maximum speed without gearing; therefore, the rotor must be designed by taking into consideration not only the magnetic forces but also the centrifugal ones. Therefore, we studied a mechanical simulation by optimizing magnetic performance while limiting maximum stress and displacement. We also developed a new production process for a C-shaped sintered and hot-deformed magnet.

show abstract

Section: Summary/conclusionmentioning

confidence: 99%

Section: Introduction For Magnet Trendmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic Form applying a C-Shaped Magnet for Hybrid Electric Vehicles

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Based on these results, we optimized compositions and hot-deformation conditions to enhance the coercivity by refining grains and promoting grain isolation magnetically and to improve the remanence by eliminating abnormally growth grain areas. Consequently, we successfully developed high performance hot-deformed magnets that had greater than 1600kA/m (20 kOe) of coercivity without any addition of HREEs, which are used for HEV traction motors [33]. However, further developments are required to respond to the new requirements for next-generation application designs from customers.…”

Section: Conclusion and Future Developmentmentioning

confidence: 99%

“…a) and (b) show the magnetic property map of Dy-free and Dy-saving hotdeformed Nd-Fe-B magnets measured at room temperature and 180 °C, respectively.Improvements to the microstructure, as discussed in Sections 4-1 and 4-2, lead to enhanced magnetic properties in this magnet. In particular, the coercivity of the HREEsfree hot-deformed Nd-Fe-B magnets exceeded 1600 kA/m, which have been used for traction motors in HEVs[33].…”

mentioning

confidence: 99%