Permanent magnets and rotating electrical machines
A technology of permanent magnets and atoms, applied in the direction of circuits, magnetic objects, magnetic materials, etc., can solve problems such as the reduction of squareness ratio
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no. 1 approach
[0019] The permanent magnet of this embodiment will be described below.
[0020]
[0021] The permanent magnet of the present embodiment has composition formula: (R 1-x A x ) p Fe q m r Cu t co 100-p-q-r-t (wherein, A is at least one element selected from Ce, Pr, and Nd, R is at least one element selected from rare earth elements other than the A element, and M is at least one element selected from Zr, Ti, and Hf elements, x is a number satisfying 0.02≤x≤0.2, p is a number satisfying 10.5≤p≤12.4 atomic%, q is a number satisfying 28≤q≤40 atomic%, r is satisfying 0.88≤r≤4.3 atomic% , and t is a composition represented by a number satisfying 3.5≤t≤13.5 atomic %).
[0022] A in the above composition formula is an element that contributes to the improvement of magnetization. As the element A, for example, at least one element selected from cerium (Ce), praseodymium (Pr), and neodymium (Nd) may be mentioned. Element A has an effective magnetic moment higher than that of S...
no. 2 approach
[0076] The permanent magnet of the first embodiment can be used in rotating electric machines such as various electric motors and generators. In addition, it can also be used as a fixed magnet or a variable magnet of a variable magnetic flux motor or a variable magnetic flux generator. By using the permanent magnet of the first embodiment, various motors or generators are configured. In the case where the permanent magnet of the first embodiment is used in a variable magnetic flux motor, for example, Japanese Patent Laid-Open No. 2008-29148 or Japanese Patent Laid-Open No. 2008-43172 can be used in the configuration or drive system of the variable magnetic flux motor. technology disclosed in the bulletin.
[0077] Next, a rotating electrical machine having the permanent magnet described above will be described with reference to the drawings. image 3 It is a figure which shows the permanent magnet motor in this embodiment. image 3 In the illustrated permanent magnet motor ...
Embodiment 1、 Embodiment 2
[0087] The raw materials used in the permanent magnet are weighed and mixed according to a prescribed ratio, and then arc-melted in an Ar gas atmosphere to produce an alloy ingot. After the alloy ingot was heat-treated at 1160° C. for 12 hours, the alloy ingot was roughly pulverized and pulverized by a jet mill to prepare an alloy powder as a raw material powder of a magnet. The obtained alloy powder was press-formed in a magnetic field to produce a compression-formed body.
[0088] Next, the compression-molded body of the alloy powder was arranged in the sintering furnace chamber, and after the chamber was made into a vacuum state, the temperature was raised to 1225° C. and kept at the reached temperature for 10 minutes. Thereafter, as shown in Table 2, Ar gas was introduced, the temperature was raised to 1240° C. in the Ar atmosphere, and the temperature was maintained at the reached temperature for 4 hours. Next, it cooled to 1190 degreeC, and the pressure in a chamber was...
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