JP2002044889A - 3-axis anistropic one-body permanent magnet and rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide 3-axis anisotropic one-body permanent magnets which can build a rotating machine having higher efficiency than conventional one, and a rotating machine using it. SOLUTION: The rotating machine uses arch segments consisting of 3-axis anisotropic one-body permanent magnets. This rotating machine is featured in that the relation RK>=RM is maintained, provided that the center positions on both sides of the above permanent magnets of the 1-axis anisotropic sections are P1 and P3, and the center between P1 and P3 is P2, and also the circle line virtually connecting these three points has a radius RK, and further making Q represent the point where the lines of magnetizing directions M1, M2 and M3 meet after passing through P1, P2 and P3, and assuming that the distance between P2 and Q is RM.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an arc segment-shaped permanent magnet having triaxial anisotropy. The present invention also relates to a high-performance rotating machine configured using the permanent magnet.

[0002]

2. Description of the Related Art The air gap magnetic flux density waveform and the effective magnetic flux which affect the efficiency of a rotating machine of a permanent magnet field type greatly vary depending on the shape of a field magnet and a pattern for imparting magnetic anisotropy. Japanese Patent Application Laid-Open No. 11-285185 discloses a permanent magnet 11 (for example, a ferrite magnet) having a bathtub curve shape in cross section on a rotor core (magnet-embedded field core; hereinafter referred to as a core) 10 shown in FIG.
There is a description of a three-phase four-pole permanent magnet field type electric motor in which four bottoms (projections) having a bathtub curve shape in section are buried toward the center hole 4. The permanent magnet 11 is the rotor core 10
Are magnetically oriented in the radial direction. However, according to the study by the present inventors, as shown in Comparative Example 2 described later,
Permanent magnet 11 having a magnetic orientation described in 11-285185
It was found that when a rotating machine was constructed using the above, the demand for higher performance (higher efficiency) of the recent rotating machine could not be sufficiently satisfied, and there was room for improvement.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a three-axis anisotropic integrated permanent magnet which can constitute a rotating machine with higher efficiency than the conventional one, and a rotating machine using the same. To provide.

[0004]

A three-axis anisotropic integral permanent magnet of the present invention which has solved the above-mentioned problems is an arc segment-shaped permanent magnet having triaxial anisotropy, as shown in FIG. The radius of an arc formed by a line substantially connecting the center positions P ₁ and P _{3 of the} uniaxially anisotropic portions at both ends of the permanent magnet and the center position P ₂ of the central uniaxially anisotropic portion is defined as R
With a _K, determine the position Q where they intersect the position _P 1, _{P 2} and _{P 3} from the respective magnetization directions _M 1, _{M 2} and _{M 3} by extending the inner diameter side, and the position Q and the position _{P 2} when forming interval was defined as R _M, characterized in that it is a R _K ≧ R _M. As compared with the conventional in the case of R _K ≧ R _M can increase the efficiency of the rotating machine. Since the three-axis anisotropic integrated permanent magnet is a single body, it is excellent in incorporation into a rotating machine, and can contribute to improvement of industrial production efficiency.
It is preferable that the three-axis anisotropic integrated permanent magnet is formed of a sintered magnet because the efficiency of the rotating machine can be further improved.
The axially anisotropic integrated permanent magnet has the following general formula: (A _1−x R _x ) On · ([Fe _{1− y My} ) ₂ O ₃ ] (atomic ratio) (where A is Sr and / or Or Ba and R is L
at least one of a, Nd, Pr and Ce, wherein the ratio of La in R is 30 atomic% or more, M is Co or Co and Zn, and x, y and n are the following conditions, respectively: It is a number that satisfies 0.01 ≦ x ≦ 0.4, 0.005 ≦ y ≦ 0.04, and 5 ≦ n ≦ 6.2. ) Is highly practical when it is made of a ferrite magnet substantially having a magnetoplumbite type crystal structure having a basic composition represented by L for R
It is allowed to contain unavoidable rare earth elements (including Y) other than at least one of a, Nd, Pr and Ce. X, y and n are set to 0.01 ≦ x ≦ 0.4, 0.005 ≦ y ≦ 0.04 and 5 ≦ n ≦ 6.2, respectively, and the ratio of La occupying R is set to 30 atomic% or more in order to have magnetic properties that can withstand practical use. It is more preferable that the ratio of La to R be 50 atomic% or more. Molar ratio n
Must be 5 to 6.2, more preferably 5.5 to 6.1, and particularly preferably 5.7 to 6.0. When n exceeds 6.2, the intrinsic coercive force iHc greatly decreases due to the presence of a different phase (such as α-Fe ₂ O ₃ ) other than the magnetoplumbite phase, and when n is less than 5, the residual magnetic flux density Br greatly decreases. x is preferably 0.01 to 0.4, more preferably 0.1 to 0.3, and particularly preferably 0.15 to 0.25. If x is less than 0.01, the effect of addition cannot be obtained, and if it exceeds 0.4, the magnetic properties deteriorate. Ideally, the relationship of y = x / (2.0n) needs to be established between y and x for charge compensation. However, when y is x / (2.6n) or more, x / (1.6n) If) or less, a triaxial anisotropic integrated ferrite sintered magnet having a high Br and a high demagnetization curve squareness ratio can be produced. When y deviates from x / (2.0n), Fe ²⁺
May be included, but there is no problem. In a typical example, the preferred range of y is 0.04 or less, especially 0.005 to
0.03. In order to obtain a dense sintered ferrite magnet, it is extremely important in practice to contain predetermined amounts of SiO ₂ and CaO as additives for controlling the sinterability. SiO ₂ is a additive inhibit grain growth during sintering, SiO ₂ on the total weight of the 3-axis anisotropic integral ferrite sintered magnet as 100 wt%
Preferably, the content is 0.05 to 0.55% by weight, and 0.25 to
More preferably, it is 0.50% by weight. SiO ₂ content 0.05
If the amount is less than 0.5% by weight, the crystal grain growth proceeds excessively during sintering, and the coercive force is greatly reduced. descend. CaO is an additive that promotes crystal grain growth, and preferably has a CaO content of 0.35 to 1.5% by weight based on a total weight of the triaxial anisotropic integrated ferrite sintered magnet of 100% by weight, and 0.4 to 1.0% by weight. %, More preferably from 0.5 to 0.9% by weight. If the CaO content exceeds 1.5% by weight, crystal grain growth proceeds excessively during sintering, and the coercive force greatly decreases. If the content is less than 0.35% by weight, crystal grain growth is excessively suppressed and the degree of orientation is improved by crystal grain growth. Is insufficient and Br is greatly reduced. 5.7 ≦ n ≦
6.2, 0.2 ≦ x ≦ 0.3 and 1.0 <x / 2ny ≦ 1.3 R
Excess basic component composition is selected, and CaO content is 0.5-0.
When the content of SiO _{2 is} 9% by weight and the content of SiO ₂ is 0.25 to 0.55% by weight, the squareness ratio of the demagnetization curve can be remarkably increased as compared with the conventional case. When the triaxial anisotropic integral ferrite sintered magnet of the present invention has the above basic composition and the M element is composed of Co and Zn, the room temperature iHc is set to 279 kA / m (3.5 kOe) or more, and heat resistance is provided. Therefore, [Co / (Co + Z
n)] The ratio is preferably 50 to 90 atomic%, and 70 to 90 atomic%.
More preferably, it is set to atomic%. 90 atomic% Co content
If the content is higher than the above, the effect of improving Br by the inclusion of Zn is practically not obtained, and if the Co content is less than 50 atomic%, iHc at room temperature is 279 kA / m2.
(3.5 kOe) or more cannot be obtained. When the three-axis anisotropic integral permanent magnet of the present invention is substantially composed of a ferrite sintered magnet having a magnetoplumbite crystal structure, it is considered that the magnet substantially has a magnetoplumbite crystal structure when the phase exhibiting magnetic properties is It is not limited to the case where only the magnetoplumbite phase is used, but includes the case where the main phase is the magnetoplumbite phase.

Further, the rotating machine of the present invention is a rotating machine using an arc segment-shaped permanent magnet having triaxial anisotropy, wherein a center position P _{1 of a} uniaxial anisotropic portion at both ends of the permanent magnet is provided. and P _3, as well as the radius of the circular arc substantially connecting line forms a center position P ₂ of the uniaxial anisotropy portion of the central R _K
From the positions P ₁ , P _2, and P ₃ , the respective magnetization directions M ₁ , M _2, and M ₃ are extended toward the inner diameter side to obtain a position Q at which they intersect, and the position Q and the position P ₂ when the Nasu interval and _{R M,} characterized in that it is a _{R K} ≧ _{R M.} Compared to a conventional rotary machine using field magnets, the rotating machine of the present invention can reduce the amount of leakage magnetic flux between adjacent field magnets, thereby increasing the effective magnetic flux (efficiency) and simultaneously improving the performance of the rotary machine. A suitable air gap magnetic flux density distribution waveform can be obtained. In particular, the rotating machine of the present invention has four magnetic poles or six magnetic poles.
The pole and the three-axis anisotropic integral permanent magnet are represented by the following general formula: (A _1-x R _x ) On · ([Fe _{1- y My} ) ₂ O ₃ ] (atomic ratio) ( Where A is Sr and / or Ba, and R is L
at least one of a, Nd, Pr and Ce, wherein the ratio of La in R is 30 atomic% or more, M is Co or Co and Zn, and x, y and n are the following conditions, respectively: It is a number that satisfies 0.01 ≦ x ≦ 0.4, 0.005 ≦ y ≦ 0.04, and 5 ≦ n ≦ 6.2. ), And has high practicality in the case of a ferrite magnet substantially having a magnetoplumbite type crystal structure.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The three-axis anisotropic integral permanent magnet of the present invention can be formed using a known anisotropic bulk magnet material or a bonded magnet material. Is more preferred. For example, a ferrite magnet (Sr ferrite magnet or the like) having a triaxial anisotropic integrated permanent magnet whose main phase is a magnetoplumbite crystal structure phase, or R ′ ₂ Fe
R'-Fe-B based sintered magnet having a _14B intermetallic compound as a main phase (R 'is at least one kind of rare earth element including Y and contains at least one kind of Nd, Pr and Dy ) Is practical. In producing an integral sintered magnet or a bonded magnet having triaxial anisotropy, the imparting of triaxial anisotropy is performed by devising a mold structure for molding in a magnetic field and forming a final product in a molding step in a magnetic field. This is performed by applying an orientation magnetic field corresponding to the magnetization direction of the axially anisotropic integrated permanent magnet.

Hereinafter, the present invention will be described in detail with reference to the drawings and embodiments, but the present invention is not limited thereto. FIG. 1 is a sectional view of a main part of a brassless motor 30 which is an embodiment of the rotating machine of the present invention. The brassless motor 30 includes a rotor core 24 formed by laminating a ferromagnetic thin plate (silicon steel plate) having a thickness of about 0.5 mm around a rotation shaft 23, and a three-axis motor embedded in the rotor core 24. A rotor 20 configured by arranging anisotropic integrated permanent magnets 25a, 25b, 25c, and 25d, and a stator facing through an air gap 28
21. The magnetic anisotropy of the three-axis anisotropic integrated permanent magnets 25a, 25b, 25c and 25d is given in the directions of arrows (M ₁ , M ₂ and M ₃ , respectively). The projections of the three-axis anisotropic integrated permanent magnets 25a and 25c, and the projections of 25b and 25d are opposed via the rotating shaft 23 and the rotor core 24, and are adjacent field magnets, for example, 25a and 25b. twenty five
The symmetrical four-pole magnetic poles N, S, N, and S are formed at equal intervals in the circumferential direction of the outer peripheral surface of the rotor 20 so that the protruding ends of the a and 25d are arranged close to each other. In rotor 20, 1
Lines of magnetic force from the two field magnets 25 are generated in the directions M ₁ , M ₂ and M ₃ , converge on the outer peripheral surface of the rotor 20 and
Since the magnetic poles are formed, the effective magnetic flux amount (efficiency) of the rotating machine can be increased.

[0008] In three-axis anisotropic integral permanent magnet 25 shown in the perspective view of FIG. 2, T ₁ is the thickness of the uniaxial anisotropy portion of the central, T ₂ is uniaxial anisotropic portion at both ends Is the thickness of
M ₁ and M ₃ are the directions in which the magnetic anisotropy is imparted to the uniaxially anisotropic portions at both ends, and M ₂ is the direction in which the magnetic anisotropy is imparted to the central uniaxially anisotropic portion. X ₁ is 3-axis anisotropic integral permanent magnet 25
A straight line extending along both end portions of the edge on the convex side is formed, and an intersection R between the two extended lines and a position S where a perpendicular drawn from the intersection R to the convex plane intersects with the convex plane are formed. The interval. X ₂ is extended straight along the side face side end edge of the three-axis anisotropic integral permanent magnet 25, cross the intersection W of the two extension lines, and the perpendicular and the recess planar grated the recess plane from the intersection W is This is an interval between the position W and the position W. theta ₁ is extended straight along the edge end portions of the convex portion side and the angle of the two extension lines, theta ₂ is the opening angle of the arc segment 25. FIG. 3A is a cross-sectional view showing an arc segment in which the three-axis anisotropic integrated permanent magnet 25 has an arc shape and has flat portions 34, 34 formed at the side end portions. FIG. 3B shows a shape in which the three-axis anisotropic integrated permanent magnet 25 ′ has a convex-side flat portion 49 and a concave-side flat portion 45, and flat portions 44, 44 at the side end.
FIG. 4 is a cross-sectional view showing an arc segment in which is formed. Further, as schematically shown in FIGS. 3A and 3B, the three-axis anisotropic integrated permanent magnet 25 (25 ′) has different uniaxial anisotropic directions (M ₁ , M ₂ or M _3). (Directions) are substantially constituted by three uniaxial anisotropic regions 31, 32 and 33 (41, 42 and 43). The uniaxial anisotropic regions 31 and 32 (41 and 4
Between 2), there is a transition region 37 (47) in which the magnetic anisotropy imparting direction changes from M _{1 to} M ₂ , and uniaxial anisotropic regions 32 and 33 exist.
Is present transition region 38 where the magnetic anisotropy imparting direction is changed to M ₂ → M ₃ (48) between (42 and 43). However, these transition regions 37, 38 (47, 48) are more integral with the triaxial anisotropic integrated permanent magnet 25 (25 ') than the uniaxial anisotropic regions 31, 32, and 33 (41, 42, and 43). The uniaxial anisotropic regions 31, 32, and 33 (41, 42, and 43) effectively contribute to the realization of a high-efficiency, high-torque rotating machine having a small volume ratio. Uniaxial anisotropic region in triaxial anisotropic integrated permanent magnet 25 (25 ')
The volume ratio of 31, 32 and 33 (41, 42 and 43) is 31:32:33 (41:
42:43) = 5-45: 90-10: 5-45, preferably 31:32:33 (41:42:43) = 20-40: 60-20: 20-
More preferably, it is set to 40. The average magnetic anisotropy imparting directions in each of the uniaxial anisotropic regions 31, 32 and 33 (41, 42 and 43) are M ₁ , M ₂ and M ₃ respectively,
The direction of the magnetic field lines in the uniaxial anisotropic region 31, 32 or 33 (41, 42 or 43) is determined by the average value (M
Contains _{1, M 2} or _{M 3)} 5 ° within the to. Also,
To increase the rotating machine efficiency as compared with the conventional, if the number of magnetic poles to constitute a four-pole rotating machine misorientation of M ₁ and M ₃ eighty-eight to twelve
It is preferable to be 0 °, if the number of magnetic poles constitute a six-pole rotating machine is preferably a fifty-eight to ninety ° misorientation of M ₁ and M _3. In these cases, the misorientation between M ₁ and M ₂ or M
The misorientation between ₂ and M ₃ should be greater than 5 ° and less than the misorientation between M ₁ and M ₃ . The three-axis anisotropic integrated permanent magnet of the present invention is prepared by using L ₁ = 5 to 30 mm, 0.3 L ₂ ≦ L ₁ ≦ 2.5
_{L 2, 0.7T 2 ≦ T 1} ≦ 1.3T 2, 88 ° ≦ θ 1 ≦ 120 ° and 90 ° ≦ theta is ₂ ≦ 120 °, and _T 1 = _3~9mm For ferrite magnets, R'- In the case of the Fe-B based magnet, by forming it into a shape of T ₁ = 1.4 to 4 mm, a rotating machine with higher torque and higher efficiency can be configured as compared with the case where a conventional field magnet is used. The center position P ₁ , P ₂ or P ₃ in FIGS. 3A and 3B can be determined as follows. First, the directions of the lines of magnetic force generated from the magnetized triaxial anisotropic integrated permanent magnet 25 (25 ') are measured, and the uniaxial anisotropic regions 31, 32 and
Determine 33 (41, 42 and 43). Next, from the cross-sectional shapes of the uniaxial anisotropic regions 31, 32, and 33 (41, 42, and 43), respective rigid bodies having the respective cross-sectional shapes are assumed, and center positions P ₁ and P ₂ are defined as the centers of gravity of the respective rigid bodies. or _{P 3} can be determined. In FIGS. 3A and 3B,
If three points P _{1, P 2} and _{P 3} are not present on the same arc in an arc determined by regression analysis, as three points _P 1, _{P 2} and _{P 3} are closest, seeking _{R K} be able to. 3 (a) and 3 (b), the intersection position Q
There they may have a two-point may be the R _M using a larger of the eggplant interval if its the position Q of the two points and the position P _2.

(Embodiment 1) The brushless motor 30 shown in FIG.
As a field magnet, [(Sr_0.99Ba_0.01)_1-xLa_x] O ・ n [(Fe
_1-yCo_y)_TwoO_Three] (Atomic ratio), x = 0.23, y = 0.016, n
= 6 and SiO 2_Two0.39% by weight, C
containing 0.8% by weight of aO, formed in the shape of FIG.₁= 8.2
mm, T₂= 7.8mm, θ₁= 98 °, θ₂= 110 °, X₁
= 7mm, X₂= 13.8mm, axial length L = 84mm, R
_M= 16.0mm and R_KHas dimensions of 19.5mm,
Triaxial anisotropic monolith with netoprubite-type crystal structure
Ferrite sintered magnets 25a to 25d were produced. These fe
Each of the light magnets has a magnetization direction M₁And M₂Angle with
Degree is about 49 °, M ₂ And M₃Angle of about 49 °
Met. Typical magnetic properties at room temperature (Br, coercive force
Hc and iHc) are shown in Table 1. Then, the field
Magnets 25a to 25d are magnetized and incorporated into a brushless motor
30 were produced. The effective magnetic flux of the brushless motor 30
Table 1 shows the measurement results of the motor and motor efficiency (displayed as relative values).
Show. Also, the rotor 20 incorporated in the brushless motor 30
Magnetic flux density in the air gap 28 along the outer peripheral surface of
FIG. 4 shows the result of measuring the degree distribution. From Fig. 4, high efficiency
Suitable for configuring brushless motors with high torque and high torque
It can be seen that a substantially trapezoidal magnetic flux density distribution waveform was obtained.
You. Also, in the magnetic flux density distribution waveform for one magnetic pole in FIG.
Where α is the width of one magnetic pole and the maximum value of the magnetic flux density distribution waveform is
(Bg), the waveform width from 0.9Bg to 1.0Bg is 0.6α
Met. From the related study of the present inventors, one magnetic pole
Waveform width of 0.9Bg to 1.0Bg in magnetic flux density distribution waveform
Is 0.5α to 0.7α, motor efficiency and torque
It turned out to be able to enhance Luke.

[0010]

[Table 1]

(Comparative Example 1) Uniaxially anisotropic trapezoidal ferrite sintered magnets 51, 52 and 53 having the same composition as the ferrite sintered magnet of Example 1 (the magnetization direction is M ₄ , respectively)
To prepare a M ₅ and _{M 6).} These were adhered with an epoxy adhesive to produce a field magnet 50 of FIG. 5 having the same shape and substantially the same magnetic anisotropy as the triaxial anisotropic integral ferrite sintered magnet of Example 1. Hereinafter, this field magnet 50
A brushless motor having the same structure as that of FIG. Table 1 shows the results of measuring the magnetic properties of the field magnet 50 at room temperature, the effective magnetic flux amount and the efficiency of the manufactured brushless motor. FIG. 6 shows the results of measuring the circumferential magnetic flux density distribution waveform in the air gap of the manufactured brushless motor. In FIG.
The waveform width from 9 Bg to 1.0 Bg was about 0.6α, which was good, but as shown in Table 1, the effective magnetic flux amount and the motor efficiency were lower than those in Example 1. From the examination of the present inventors, it was found that the effective magnetic flux amount and the motor efficiency were reduced as compared with the first embodiment due to the effect of the bonded portion. Comparative Example 2 A ferrite sintered magnet having the same shape as the three-axis anisotropic integral ferrite sintered magnet of Example 1 except that it has the radial anisotropy shown in FIG. 7 (provided that R _M = 22.0 mm and R _K = 19.5 mm). A brushless motor having the same structure as in FIG. 1 was produced and evaluated in the same manner as in Example 1 except that this ferrite magnet was used as a field magnet. Table 1 shows the results of measuring the magnetic properties of the ferrite magnet at room temperature, the effective magnetic flux and the efficiency of the manufactured brushless motor. FIG. 8 shows the results of measuring the magnetic flux density distribution waveform in the circumferential direction of the air gap of the manufactured brushless motor.
Shown in In FIG. 8, the waveform width from 0.9Bg to 1.0Bg is about 0.
6α was good, but as shown in Table 1, the effective magnetic flux amount and the motor efficiency were lower than those in Example 1. From a study of the present inventors, in comparison with the amount of effective magnetic flux and motor efficiency is lowered in Example 1, the field magnet becomes R _{K <R M} because it has a radially anisotropic, the rotary machine 1 It was found that the degree of convergence of the lines of magnetic force to the magnetic poles was weakened. Comparative Example 3 A ferrite sintered magnet having the same shape as the triaxial anisotropic integral ferrite sintered magnet of Example 1 was produced except that the parallel anisotropy shown in FIG. 9 was imparted. 1 in the same manner as in Example 1 except that this ferrite magnet was used as a field magnet.
A brushless motor having the same structure as described above was manufactured and evaluated. Table 1 shows the results of measuring the magnetic properties at room temperature of the ferrite magnet, the effective magnetic flux amount and the efficiency of the manufactured brushless motor.
Shown in The figure also shows the results of measuring the circumferential magnetic flux density distribution waveform in the air gap of the manufactured brushless motor.
See Figure 10. In FIG. 10, the waveform width from 0.9Bg to 1.0Bg is approximately
0.74α, and as shown in Table 1, the effective magnetic flux amount and the motor efficiency were extremely lower than those in Example 1. For this reason, the motor torque was smaller than in the first embodiment, and it was found that it was necessary to increase the power consumption in order to obtain the same motor torque as in the first embodiment.

(Embodiment 2) The brushless motor 30 of FIG.
As a field magnet, [(Sr_0.99Ba_0.01)_1-xLa_x] O ・ n [(Fe
_1-yCo_0.7yZn_0.3y)_TwoO_Three] (Atomic ratio), x = 0.20, y =
It has a basic composition represented by 0.016, n = 5.9,_TwoTo 0.4
Contains 3% by weight and 0.65% by weight of CaO, and is formed into the shape shown in Fig. 2.
Re T₁= 8.1mm, T₂= 7.7mm, θ ₁= 98 °, θ₂=
109 °, X₁= 7mm, X₂= 13.6mm, axial length L
= 83mm, R_M= 16.0mm and R_K= Dimension of 19.4mm
Having a magnetoplumbite crystal structure
Anisotropic integrated ferrite sintered magnets 25a to 25d were prepared.
Each of these ferrite magnets has a magnetization direction M₁And M
₂Is about 49 °, and M₂ And M₃Make with
The angle was about 49 °. The magnetic properties at room temperature are Br = 450m
T (4.5 kG), iHc = 302 kA / m (3.8 kOe), and 3 of Example 1
Higher Br than axially anisotropic integrated ferrite sintered magnet
is there. Next, these field magnets 25a to 25d are magnetized and assembled.
Immediately after fabricating the brushless motor 30
The effective magnetic flux of the brushless motor was measured. Effective obtained
The magnetic flux is compared to the effective magnetic flux of the brushless motor of the first embodiment.
About 1.5% higher in all, with good motor performance
I found out. Comparative Example 4 Except for having the radial anisotropy shown in FIG.
Same as the triaxial anisotropic integrated ferrite sintered magnet of Example 2.
Shaped ferrite sintered magnet (R_M= 21.9mm
And R_K= 19.3 mm). These ferrites
Magnetize in the same manner as in Example 2 except that the magnet is a field magnet
And a brushless motor with the same structure as in Fig. 1
Data was prepared. Immediately after manufacturing this brushless motor
The effective magnetic flux was measured at
It was about 2% lower than the brushless motor of Example 2.

[0013]

As described above, by using the three-axis anisotropic integrated permanent magnet of the present invention, it is possible to provide a rotating machine with higher efficiency and higher torque than before. Also,
It is possible to reduce the size and weight of the rotating machine and to obtain a useful effect that the assembly efficiency of the rotating machine can be improved because it is integrated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an example of a rotating machine of the present invention.

FIG. 2 is a perspective view showing an example of a three-axis anisotropic integrated permanent magnet of the present invention.

FIG. 3 is a schematic view illustrating a three-axis anisotropic integrated permanent magnet according to the present invention. FIG. 3 (a) is a cross-sectional view illustrating an arc segment having an arc shape, and FIG. It is sectional drawing (b) shown.

FIG. 4 is a diagram showing an air gap magnetic flux density distribution of an example.

FIG. 5 is a sectional view of a main part showing a field magnet of a comparative example.

FIG. 6 is a diagram showing a gap magnetic flux density distribution of a comparative example.

FIG. 7 is a sectional view of a main part showing a field magnet of a comparative example.

FIG. 8 is a diagram showing a gap magnetic flux density distribution of a comparative example.

FIG. 9 is a sectional view of a main part showing a field magnet of a comparative example.

FIG. 10 is a diagram showing the air gap magnetic flux density distribution of the comparative example.

FIG. 11 is a sectional view showing a conventional rotating machine.

[Explanation of symbols]

20 rotors, 21 stators, 23 rotating shafts, 24 rotor cores, 25a, 25b, 25c, 25d field magnets (3-axis anisotropic integrated permanent magnets), 26 stator cores, 30 rotating machines.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H019 AA04 AA07 AA10 CC03 CC08 GG01 5H621 BB07 BB10 GA04 GA11 HH01 5H622 CA02 CA10 CA13 CB04 CB05 DD01 PP01 QA10

Claims (4)

[Claims] 1. An arc segment-shaped permanent magnet having triaxial anisotropy, wherein central positions P ₁ and P _{3 of} uniaxial anisotropic portions at both ends of the permanent magnet, and a central uniaxial anisotropic member. the radius of the circular arc substantially connecting line the center position _{P 2} of the sexual portion is formed with a _{R K,} the position _P 1, the inner diameter of _{P 2} and each of the magnetization directions _M 1 from _{P 3, M 2} and _{M 3} obtain the position Q that intersects they extend to the side, when the forming distance between the position P ₂ and a position Q was R _M, R _K ≧ R
_M is a three-axis anisotropic integral permanent magnet. 2. The three-axis anisotropic integrated permanent magnet has the following general formula: (A _1−x R _x ) On · ((Fe _{1− y My} ) ₂ O ₃ ] (atomic ratio) ( Where A is Sr and / or Ba, and R is L
at least one of a, Nd, Pr and Ce, wherein the ratio of La in R is 30 atomic% or more, M is Co or Co and Zn, and x, y and n are the following conditions, respectively: It is a number that satisfies 0.01 ≦ x ≦ 0.4, 0.005 ≦ y ≦ 0.04, and 5 ≦ n ≦ 6.2. 2. The three-axis anisotropic integrated permanent magnet according to claim 1, which is a ferrite magnet having a basic composition represented by the formula (1) and substantially having a magnetoplumbite type crystal structure. 3. An arc segment type having triaxial anisotropy.
A rotating machine using a permanent magnet in a shape, wherein a center position P of a uniaxially anisotropic portion at both ends of the permanent magnet is provided.₁You
And P₃, And the central position P of the central uniaxial anisotropic part
₂The radius of the arc formed by the line substantially connecting _KTo be
With position P₁, P₂And P₃From each magnet
Direction M₁, M ₂And M₃Extend to the inner diameter side
Is determined, and the position Q and the position P₂While
R_MAnd R_K≧ R_MIs characterized by
Rotating machine. 4. The rotating machine according to claim 1, wherein the rotating machine has four or six magnetic poles, and the three-axis anisotropic integral permanent magnet has the following general formula: (A _1-x R _x ) On · (Fe _{1-y M y) 2 O} 3] ( atomic ratio) (wherein, a is Sr and / or Ba, R is L
at least one of a, Nd, Pr and Ce, wherein the ratio of La in R is 30 atomic% or more, M is Co or Co and Zn, and x, y and n are the following conditions, respectively: It is a number that satisfies 0.01 ≦ x ≦ 0.4, 0.005 ≦ y ≦ 0.04, and 5 ≦ n ≦ 6.2. The rotating machine according to claim 3, wherein the rotating machine is a ferrite magnet having a basic composition represented by the formula (1) and substantially having a magnetoplumbite type crystal structure.