Environmental Engineering Reference
In-Depth Information
Table 7.31 Fifth and sixth Chinese rotary magnetic prototypes from Baotou Research Institute of
Rare Earths
Name and address of institute
Baotou Research Institute of Rare Earths. Add: No.36,
Huanghe Street, RE High-tech Zone, Baotou,
Inner Mongolia, P.R. China, 014030
Name of contact person/email
Jiaohong Huang/jiaohongh@sina.cn
Year of production
2009 - 2012
Type
Rotary
Maximum frequency
0.2 Hz
Maximum cooling power
60 W
Maximum temperature span
20 K
Type of AMR
Packed bed
MC material(s)
Gd, Gd
Tb spheres, 0.3
0.5 mm, 1,500 g
-
-
Type of magnets
Rotating permanent Nd Fe B, 1.4 T
A special feature of the AMRs was the fabrication of the Gd to make a regen-
erator. A block of Gd was cut with a 0.3-mm-thick wire to get 1-mm-thick plates
that were still attached to the base of the bulk. Then similar parallel cuts were made,
however, at 90
rst set. In this way, 11-mm-high pins (still
attached to the base) with a 1 mm 2 square cross-section were produced. After this a
0.5-mm epoxy plate was attached to the free surface of the pins. Then the Gd base
was cut using a spark-erosion technique. The free surface of the cut pins was also
covered with a 0.5-mm thick layer of epoxy. In this way, the rigid structure of the
Gd regenerator was obtained. The performance tests were carried out at an oper-
ating frequency of 0.5 Hz. The maximum no-load temperature span was 11 K.
°
in relation to the
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