Permanent magnets, motors and generators
A technology of permanent magnets and sintered bodies, which can be applied to magnetic objects, circuits, magnetic materials, etc., and can solve problems such as deterioration of magnet characteristics.
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Embodiment approach 1
[0017] The permanent magnet of this embodiment will be described below.
[0018]
[0019] The permanent magnet has a sintered body, and the sintered body has the composition formula: R p Fe q m r Cu t co 100-p-q-r-t (wherein, R is at least one element selected from rare earth elements, M is at least one element selected from the group consisting of Zr, Ti, and Hf, and p satisfies 10.8≤p≤12.5 atoms %, q is a number satisfying 25≤q≤40 atomic %, r is a number satisfying 0.88≤r≤4.5 atomic %, t is a number satisfying 3.5≤t≤13.5 atomic %), and its composition includes 50 mass ppm or more and 1500 mass ppm or less carbon. In the above permanent magnet, the atomic ratio in the above composition formula is the atomic ratio when the sum of R, Fe, M, Cu, and Co is taken as 100 atomic %, and the sintered body contains a small amount of carbon.
[0020] R in the above composition formula is an element that can make the magnet material have a large magnetic anisotropy. As the eleme...
Embodiment approach 2
[0093] The permanent magnet of Embodiment 1 can be used for various motors or 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 Embodiment 1, various electric motors and generators are configured. In the case where the permanent magnet of Embodiment 1 is applied to a variable flux motor, Japanese Patent Laid-Open No. 2008-29148 or Japanese Patent Laid-Open No. 2008- The technology disclosed in the No. 43172 bulletin.
[0094] Next, a motor and a generator using permanent magnets will be described with reference to the drawings. image 3 is a diagram showing a permanent magnet motor. exist image 3 In the shown permanent magnet motor 1 , a rotor 3 is arranged inside a stator 2 . The permanent magnet 5 which is the permanent magnet of Embodiment 1 is arrange|positioned in the iron core 4 of the rotor 3. By using the permanent magnets o...
Embodiment 1、 Embodiment 2
[0104] After weighing and mixing each raw material for a permanent magnet at a predetermined ratio shown in Table 1, arc melting was performed in an Ar gas atmosphere to produce an alloy ingot. The alloy ingot was heat-treated by holding at 1160° C. for 20 hours, and then the alloy ingot was coarsely pulverized and pulverized by a jet mill to prepare an alloy powder as a raw material powder of a magnet. The obtained alloy powder is press-formed in a magnetic field to produce a green compact.
[0105] Next, the powder compact of the alloy powder is arranged in the cavity of the sintering furnace, so that the vacuum degree in the cavity is 3.2×10 -3 After the vacuum state of Pa, the temperature was raised to 1165° C. and kept at the reached temperature for 40 minutes. In addition, as shown in Table 1, the humidity X measured by the above-mentioned method from one hour before the sample was introduced into the sintering furnace until it was introduced into the sintering furnace ...
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Abstract
Description
Claims
Application Information
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