TY - JOUR
T1 - Investigation on magnetic torque of multi-polarly micro rotor using shape-magnetic-anisotropy
AU - Yamashita, F.
AU - Nishimura, S.
AU - Menjo, N.
AU - Kobayashi, O.
AU - Nakano, M.
AU - Fukunaga, H.
AU - Ishiyama, K.
N1 - Funding Information:
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO), under Project P07026 of Japan.
PY - 2010/6
Y1 - 2010/6
N2 - A double pole pair milli-size rotor with 1 mm in outer diameter and 0.3 mm in inner diameter was fabricated from an isotropic laminated film magnet with a non-magnetic material. Permeance coefficient distribution together with static magnetic field of the film were also estimated by using 3-D and 2-D finite element model, and the average permeance coefficient, B/μoH, could be estimated as 18.7. A torque of the isotropic film magnet with the remanence value of approximately 1 T was measured under the different field strength, and a relative torque and relative torque constant, dT/dH-gradient, of the above-mentioned magnet with the double pole pair increased by 172 % and 152 %, respectively, compared with those of an anisotropic bulk magnet with a single pole pair whose remanence value was approximately 1.3 T. It was found that use of isotropic laminated film magnet is effective in obtaining a micro multi-polarly magnetized rotor with highly dense torque.
AB - A double pole pair milli-size rotor with 1 mm in outer diameter and 0.3 mm in inner diameter was fabricated from an isotropic laminated film magnet with a non-magnetic material. Permeance coefficient distribution together with static magnetic field of the film were also estimated by using 3-D and 2-D finite element model, and the average permeance coefficient, B/μoH, could be estimated as 18.7. A torque of the isotropic film magnet with the remanence value of approximately 1 T was measured under the different field strength, and a relative torque and relative torque constant, dT/dH-gradient, of the above-mentioned magnet with the double pole pair increased by 172 % and 152 %, respectively, compared with those of an anisotropic bulk magnet with a single pole pair whose remanence value was approximately 1.3 T. It was found that use of isotropic laminated film magnet is effective in obtaining a micro multi-polarly magnetized rotor with highly dense torque.
KW - Isotropic film magnet
KW - Laminated film magnet
KW - MEMS motor
KW - Micro DC brushless motor
KW - Micro multi-polarly magnetized rotor
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U2 - 10.1109/TMAG.2010.2041051
DO - 10.1109/TMAG.2010.2041051
M3 - Article
AN - SCOPUS:77952808419
SN - 0018-9464
VL - 46
SP - 2012
EP - 2015
JO - IEEE Transactions on Magnetics
JF - IEEE Transactions on Magnetics
IS - 6
M1 - 5467532
ER -