Pr-Fe-Co-Ti-B-Si系ボンド磁石の磁気特性並びにこれらボンド磁石ロータを用いたブラシレスモータの試作

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Melt-spun ribbons of Pr_xFe_<91.5-x-y-z>Co_8Ti_yB_zSi_<0.5> (x=9.0-11.0, y=0.5-2.0, z=7.5-11.5) alloys were prepared by the single roller liquid rapid-quenching method, and the effects of composition, substrate surface velocity and annealing condition on the magnetic properties were studied. The optimum preparation conditions and some of the properties were as follows: composition: Pr_<10>Fe_<69.5>Co_8Ti_<1.5>B_<10.5>Si_<0.5>; substrate surface velocity: 10.0 m/s; annealing condition: 650℃ for 0 min in Ar atmosphere; magnetic properties: (BH)_<max>=119.9 kJ/m^3, H_<cJ>=-1004.0 kA/m, H_<cB>=559.3 kA/m, J_r=0.87 T, recoil ratio=29.0 %, H_k/H_<cJ>×100=33.0 %, α(J_r)_<ave>=-0.047 %/℃, α(H_<cJ>)=-0.430 %/℃ and T_c = 393℃. From TEM observation, the average particle size of this ribbon was found to be about 16 nm. Compression-molded isotropic bonded magnets were prepared by using Pr_<10>Fe_<69.5>Co_8Ti_<1.5>B_<10.5>Si_<0.5> ribbons annealed at 650℃ for 0 min. Their magnetic and physical properties were (BH)_<max>=80.2 kJ/m^3, H_<cJ>=953.1 kA/m, H_<cB>=461.9 kA/m, J_r=0.69 T, H_k/H_<cJ>×100=32.8 %, irreversible loss=-2.12 % (at 125℃), and density=6.29 Mg/m^3. In comparison with properties of the brushless motor using Pr_<10>Fe_<69.5>Co_8Ti_<1.5>B_<10.5>Si_<0.5> and Nd_<8.1>Fe_<81.8>Ti_<3.1>Zr_<1.6>B_<5.4> sheet magnet rotors, it was found that the motor using Pr_<10>Fe_<69.5>Co_8Ti_<1.5>B_<10.5>Si_<0.5> sheet magnet rotor was improved 40% at torque, and the consumption current of about 20% was little.

Pr-Fe-Co-Ti-B-Si系ボンド磁石の磁気特性並びにこれらボンド磁石ロータを用いたブラシレスモータの試作

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