Magnetic field generation device and magnetic freezer unit using the same

Abstract

To provide a magnetic field generation device capable of generating a high magnetic field with a small number of permanent magnets.SOLUTION: The present invention relates to a magnetic field generation device that has at least one pair of magnetic pole parts arranged opposite each other across a space gap, wherein the magnetic pole parts are each composed of a soft magnetic body and a permanent magnet, at least two of the magnetic pole parts are magnetically connected by a common yoke, and at least two magnetic pole parts of magnetic pole parts connected to common yokes each have N (≥2) magnetic flux routes between common yokes connected by the magnetic bodies.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a magnetic field generating device and a magnetic refrigeration device using the same. [Background technology]

[0002] Vapor compression refrigeration freezers that use refrigerant gases such as alternatives to chlorofluorocarbons are widely used in air conditioners and refrigerators, but magnetic refrigeration is a different cooling technology that does not use refrigerant gases.

[0003] Magnetic refrigeration utilizes the magnetocaloric effect, whereby a ferromagnetic material generates heat when a magnetic field is applied (excited) in an adiabatic state, and absorbs heat when the magnetic field is removed (demagnetized). In magnetic refrigeration systems, the ferromagnetic material used to utilize the magnetocaloric effect is called a magnetic working material. In magnetic refrigeration systems that operate at room temperature, a high magnetic field is applied and removed periodically to the magnetic working material, and at the same time, a heat exchange liquid such as water is passed through a container filled with the magnetic working material to exchange heat and transport it, thereby realizing a heat pump.

[0004] Known examples of magnetic refrigeration devices that operate in the room temperature range include magnetic circuits using permanent magnets to reduce power consumption and form a magnetic field generator. For example, Patent Document 1 (Patent Document 1) discloses a magnetic circuit with a Halbach array of permanent magnets arranged in a circular ring shape in Figures 3 and 4. Patent Document 1 also describes a doughnut-shaped arrangement of multiple permanent magnets with different magnetization directions, which are arranged in pairs to generate a high magnetic field only in a portion of the gap between them. A duct filled with a magnetically active material is placed in the gap, and the magnetically active material is magnetized and demagnetized by rotating the pair of circular Halbach arrays. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-226735 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the technology disclosed in Patent Document 1, all components of the permanent magnet magnetic circuit in a Halbach array arranged in a circular ring are made up of permanent magnets, and if neodymium magnets are used as the permanent magnet material to obtain a practically sufficient magnetic field (typical magnetic flux density of 1 T or more), there is a problem that the price of the device increases.

[0007] The problem to be solved by the present invention is to provide a magnetic field generator capable of generating a strong magnetic field with a small amount of permanent magnets, and a magnetic refrigerator using the same. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the magnetic field generating device of the present invention is a magnetic field generating device having at least one set of magnetic pole parts arranged opposite each other across a spatial gap, wherein the magnetic pole parts are composed of a soft magnetic material and a permanent magnet, at least two of the magnetic pole parts are magnetically connected by a common yoke, and at least two of the magnetic pole parts connected to the common yoke each have N (N≧2) magnetic flux routes between them and the common yoke connected by a magnetic material.

[0009] The magnetic refrigeration apparatus of the present invention is a magnetic refrigeration apparatus using the above-mentioned magnetic field generating device, and comprises: a rotating mechanism that rotates the magnetic field generating device; a filled container at least a portion of which is placed in the spatial gap sandwiched between the pair of magnetic pole portions of the magnetic field generating device; a pump that circulates a heat exchange fluid; a cold head that is cooled by the heat exchange fluid; a heat rejection heat exchanger that rejects heat from the heat exchange fluid; and a movable valve that controls the flow of the heat exchange fluid in conjunction with the movement of the rotating mechanism, wherein the magnetic field generating device rotates around a predetermined axis; the filled container is filled with a magnetic working material; the filled container, the pump, the cold head, the heat rejection heat exchanger, and the movable valve are connected by piping to form a circulation path through which the heat exchange fluid circulates; and the cold head is cooled by the magnetic field generated by the magnetic field generating device and the magnetocaloric effect of the magnetic working material. [Effects of the Invention]

[0010] According to the present invention, the magnetic pole portion is composed of a soft magnetic material and a permanent magnet, so the amount of permanent magnet can be reduced, and by providing multiple magnetic flux routes, the magnetic flux is increased and a strong magnetic field can be generated.As a result, a magnetic field generating device that can generate a strong magnetic field with a small amount of permanent magnets and a magnetic refrigeration device using the same can be realized. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a magnetic field generating device according to a first embodiment. [Figure 2] FIG. 2 is a longitudinal sectional view taken along the axis A in FIG. 1. [Figure 3] FIG. 2 is a cross-sectional view taken along the axis A in FIG. 1. [Figure 4] FIG. 4 is a cross-sectional view taken along the line BB′ of FIG. 3. [Figure 5] FIG. 10 is a vertical cross-sectional view schematically showing a magnetic refrigeration apparatus according to a second embodiment. [Figure 6] FIG. 6 is a cross-sectional view taken along the axis A in FIG. 5. [Figure 7]FIG. 10 is a perspective view schematically showing a filling container in a magnetic refrigeration apparatus according to a second embodiment. [Figure 8] FIG. 10 is a perspective view of a magnetic field generating device according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following describes in detail the embodiments of the present disclosure, but the disclosure of each embodiment is not limited to the description of the embodiment, and configurations in which the elemental technologies disclosed or suggested in each embodiment are appropriately combined within the scope of the knowledge of a person skilled in the art are also included in the scope of the present embodiment. Furthermore, in each drawing and each embodiment, the same or similar components are denoted by the same reference numerals, and redundant explanations are omitted.

[0013] [First embodiment] The first embodiment proposes the configuration of a magnetic field generating device.

[0014] Fig. 1 is a perspective view of a magnetic field generating device according to a first embodiment, Fig. 2 is a longitudinal sectional view taken along the axis A in Fig. 1, and Fig. 3 is a transverse sectional view taken along the axis A in Fig. 1.

[0015] The magnetic field generator 100 of this embodiment has at least one set of magnetic pole parts arranged opposite to each other across a spatial gap. In this embodiment, an example will be described in which there are two sets of magnetic pole parts in total, one set of magnetic pole parts arranged opposite to each other across spatial gap 50 and another set of magnetic pole parts arranged opposite to each other across spatial gap 51. However, the present invention is not limited to this, and one set or three or more sets of magnetic pole parts may be used.

[0016] The magnetic field generating device 100 of this embodiment is composed of a base yoke 10, which is a common yoke, and three blocks 101, 102, and 103 that sandwich two spatial gaps 50 and 51 therebetween.

[0017] The block 101 is composed of one of a pair of magnetic pole parts arranged opposite each other with a spatial gap 50 therebetween, and yokes 11, 12, and 13.

[0018] The magnetic pole portion is composed of a soft magnetic material and a permanent magnet, with five permanent magnets 1-A, 1-B, 1-C, 1-D, and 1-E arranged around a soft magnetic core 1-F, which is a core of the soft magnetic material. The number of permanent magnets may be at least N, where N is the number of magnetic flux routes (described later) (N≧2). In this embodiment, an example will be described in which the number of magnetic flux routes is N=4 and the number of permanent magnets is five. Because the magnetic pole portion is composed of a soft magnetic material and a permanent magnet as in this embodiment, the amount of permanent magnets can be reduced.

[0019] The solid arrows on permanent magnets 1-A, 1-B, 1-C, 1-D, and 1-E in FIG. 1 and the arrows on permanent magnets 1-A, 1-B, 1-C, 1-D, and 1-E in FIGS. 2 and 3 indicate the magnetization directions of the permanent magnets. Each magnetization direction is arranged in a Halbach array to concentrate magnetic flux in soft magnetic core 1-F, magnetizing soft magnetic core 1-F with a first polarity. As shown in FIG. 1, permanent magnets 1-A, 1-B, and 1-C are magnetically and mechanically connected to a common base yoke 10 by yokes 11, 12, and 13, respectively. As a result, the overall magnetic circuit operates as follows: the magnetic flux flowing through base yoke 10 flows through three magnetic flux routes (yokes 11, 12, and 13) and permanent magnets 1-A, 1-B, and 1-C to soft magnetic core 1-F, as shown by the dotted arrows in Figure 1 (the magnetic flux flowing through yoke 13 is hidden and not shown). Permanent magnet 1-E is in contact with base yoke 10, and serves as one of the magnetic flux routes through base yoke 10 to soft magnetic core 1-F. Therefore, the magnetic pole portion of block 101 connected to the common yoke, base yoke 10, has N = 4 magnetic flux routes between it and the common yoke connected by a magnetic body (yoke or permanent magnet). The magnetic flux concentrated in soft magnetic core 1-F generates a magnetic field in the +X direction in air gap 50, as shown in Figure 2, and the magnetic flux enters the magnetic pole portion of adjacent block 102. As in this embodiment, by having multiple magnetic flux routes between a common yoke connected by a magnetic material (yoke or permanent magnet) rather than by space, the magnetic flux increases and a strong magnetic field can be generated, so a strong magnetic field can be generated with a small amount of permanent magnets.

[0020] Block 102 has a structure in which two magnetic pole portions are connected. Specifically, block 102 is composed of the other magnetic pole portion of a pair of magnetic pole portions arranged opposite each other across spatial gap 50, one magnetic pole portion of a pair of magnetic pole portions arranged opposite each other across spatial gap 51, and yokes 14 and 15 that connect the two. Like the magnetic pole portion of block 101, the magnetic pole portion that constitutes block 102 also has a Halbach array structure consisting of a soft magnetic core and five permanent magnets.

[0021] FIG. 4 is a cross-sectional view taken along the line BB' in FIG.

[0022] As shown in Fig. 4, four permanent magnets 2-B, 2-C, 2-D, and 2-E, magnetized in mutually repulsive directions, are arranged above, below, left, and right of soft magnetic core 2-F. Furthermore, as shown in Fig. 3, soft magnetic core 2-F and soft magnetic core 3-F are connected by a common permanent magnet 2-A, and the magnetization direction of permanent magnet 2-A is also in the direction of repulsion with permanent magnets 2-B, 2-C, 2-D, and 2-E. As a result, soft magnetic core 2-F is magnetized with the second polarity.

[0023] Returning to FIG. 2, the magnetic flux entering soft magnetic core 2-F in the magnetic pole portion facing air gap 50 flows via permanent magnet 2-A to soft magnetic core 3-F in the adjacent magnetic pole portion. At the same time, as shown by the dotted arrows in FIG. 1, the magnetic flux entering soft magnetic core 2-F passes through permanent magnets 2-B and 2-C, passes through yokes 14 and 15, and then flows to soft magnetic core 3-F via permanent magnets 3-B and 3-C. The magnetic flux concentrated in soft magnetic core 3-F generates a magnetic field in the +X direction in air gap 51, as shown in FIG. 2, and the magnetic flux enters the magnetic pole portion of the adjacent block 103. Note that soft magnetic core 3-F is magnetized with a first polarity due to the magnetization directions of permanent magnets 3-A, 3-B, 3-C, 3-D, and 3-E. The number of magnetic flux routes in the two magnetic pole portions of block 102 is one for permanent magnets 2-E and one for 3-E.

[0024] The block 103 is composed of the other magnetic pole portion of a pair of magnetic pole portions arranged opposite each other with a spatial gap 51 therebetween, and yokes 16, 17, and 18.

[0025] The structure of block 103 is similar to that of block 102, except for the arrangement of the magnetization directions of the permanent magnets. Soft magnetic core 4-F is magnetized with a second polarity due to the magnetization directions of permanent magnets 4-A, 4-B, 4-C, 4-D, and 4-E. Similar to block 101, the magnetic flux reaching block 103 passes through three magnetic flux routes along yokes 16, 17, and 18 and one magnetic flux route through permanent magnet 4-E (N=4) to base yoke 10, then passes through three yokes 11, 12, and 13 of block 101 and permanent magnet 1-E to enter soft magnetic core 1-F of block 101. In the magnetic circuit as a whole, in the magnetic field generator 100 of this embodiment, magnetic flux circulates as indicated by the dotted arrows in FIG. 2, generating a strong magnetic field in the air gaps 50 and 51.

[0026] In addition, permanent magnets 1-D, 1-E, 2-D, 2-E, 3-D, 3-E, 4-D, and 4-E arranged in the Z direction of the soft magnetic core act to confine the magnetic flux that tends to spread in the ±Z-axis directions within the space gaps 50 and 51, and these permanent magnets also effectively work to increase the magnetic field strength within the space gaps 50 and 51.

[0027] According to this embodiment, the magnetic pole portion is composed of a soft magnetic material and a permanent magnet, so the amount of permanent magnets can be reduced compared to when the entire portion is composed of permanent magnets. In addition, by providing multiple magnetic flux routes, the magnetic flux increases and a strong magnetic field can be generated, so a strong magnetic field can be generated with a small amount of permanent magnets.

[0028] In the magnetic field generator 100 of this embodiment, the dimensions of the soft magnetic cores 1-F, 2-F, 3-F, and 4-F of the magnetic pole sections in the YZ plane were 40 × 100 mm (the longitudinal direction was the Z direction), the longitudinal dimensions (Z direction) of the yokes 11, 12, 13, 16, 17, and 18 were 120 mm, and the width (X direction) of the spatial gaps 50 and 51 was 26 mm. The strength of the magnetic field generated by the magnetic field generator 100 of this embodiment was calculated using an electromagnetic field analysis simulation. A neodymium sintered magnet was used as the permanent magnet material. The calculation results showed that a magnetic flux density of 1.4 T was obtained at the center of the spatial gaps 50 and 51 in the region between the magnetic pole sections. Since a practical magnetic field requires a magnetic flux density of 1 T or more, this embodiment confirmed that a practical magnetic field can be obtained with a small amount of permanent magnets.

[0029] To increase the circulating magnetic flux and generate a strong magnetic field, at least two of the magnetic pole parts connected to a common yoke should have N (N≧2) magnetic flux routes between them and the common yoke connected by a magnetic material. In this embodiment, an example has been described in which two magnetic pole parts with N=4 magnetic flux routes are connected to a common yoke, but this is not limiting. For example, three or more magnetic pole parts with N≧2 magnetic flux routes may be connected to a common yoke.

[0030] As an example of N=2 or N=3, the number of magnetic flux routes can be adjusted so that N=2 or N=3 by not having permanent magnets 1-E and 4-E in contact with base yoke 10 but by sandwiching a space between them, or by reducing the number of yokes 11, 12, 13, 16, 17, and 18.

[0031] Alternatively, N may be greater than 4. For example, the shape of the soft magnetic core 1-F or the like may be a polyhedron with more than four sides instead of a rectangular parallelepiped, thereby making it possible to adjust the number of magnetic flux routes.

[0032] The magnetic body for connecting to the common yoke may include a yoke that connects between the common yoke and the permanent magnets of the magnetic pole parts, such as yokes 11, 12, 13, 16, 17, and 18, or may include a permanent magnet of the magnetic pole parts that contacts the common yoke, such as permanent magnets 1-E and 4-E, or may include a permanent magnet that connects between the common yoke and the permanent magnets of the magnetic pole parts by replacing yokes 11, 12, 13, 16, 17, and 18 with permanent magnets. However, using permanent magnets instead of yokes increases the amount of permanent magnets, so it is preferable to use yokes.

[0033] In order to mechanically fix the magnetic pole parts while providing multiple magnetic flux routes, it is desirable to configure the soft magnetic core of the magnetic pole parts so that at least two faces of the permanent magnets that do not face the common yoke or the air gap, more preferably three faces as shown in this embodiment, are connected to the common yoke by a yoke. If two faces are used, it is desirable that the faces face each other, so it is desirable to eliminate yokes 12 and 18 and use yokes 11, 13, 16, and 18.

[0034] In order for a set of magnetic pole parts to generate a magnetic field in the spatial gap, the permanent magnet of one of the set of magnetic pole parts may be magnetized in a direction that magnetizes the soft magnetic core to a first polarity, and the permanent magnet of the other of the set of magnetic pole parts may be magnetized in a direction that magnetizes the soft magnetic core to a second polarity. In order to circulate magnetic flux through the common yoke, which is the base yoke 10, at least one magnetic pole part having a soft magnetic core magnetized to a first polarity and at least one magnetic pole part having a soft magnetic core magnetized to a second polarity may be magnetically connected by the common yoke.

[0035] [Second embodiment] The second embodiment is an example of a magnetic refrigeration device 200 that uses the magnetic field generating device 100 of the first embodiment.

[0036] Fig. 5 is a longitudinal sectional view schematically showing a magnetic refrigeration apparatus according to a second embodiment, and Fig. 6 is a transverse sectional view taken along the axis A in Fig. 5.

[0037] The magnetic refrigeration device 200 of this embodiment includes a magnetic field generating device 100, a rotation mechanism (not shown), a filling container 80, a pump 72, a cold head 71, a heat exchanger 73 for exhaust heat, and a movable valve 81.

[0038] The configuration of the magnetic field generator 100 is the same as that of the first embodiment. At least a portion of the filling container 80 is disposed within the spatial gaps 50 and 51. The filling container 80 is filled with a magnetic working material. The filling container 80 may be cylindrical, for example. The magnetic field generator 100 is connected to a rotation mechanism (not shown) via a shaft 90 and rotates around the axis of the shaft 90 by the rotation mechanism (not shown). The filling container 80 is fixed to the movable valve 81 but is separated from the magnetic field generator 100. Therefore, even when the magnetic field generator 100 rotates, the filling container 80 and the movable valve 81 remain fixed.

[0039] Movable valve 81 houses flow path control plate 82 inside, and flow path control plate 82 is connected to shaft 90 and rotates integrally with shaft 90. Furthermore, pipes 83, 84, 85, and 86 are connected to a circulation system in which heat exchange fluid circulates as circulation flow 74. The circulation path passes through pump 72, which circulates the heat exchange fluid, heat rejection heat exchanger 73, which rejects heat from the heat exchange fluid, movable valve 81, which controls the flow of the heat exchange fluid in conjunction with the movement of the rotation mechanism, filled container 80, movable valve 81, cold head 71, which is cooled by the heat exchange fluid, movable valve 81, filled container 80, movable valve 81, and then returns to pump 72. The operation during cooling operation based on this configuration will be described later.

[0040] As shown in Fig. 6, the filling container 80 is a cylindrical container whose interior is divided into a plurality of segments by partitions. Each of these segments is filled with a magnetic working material. Here, an example in which the filling container is divided into eight regions will be described, but this is not limiting, and it is sufficient that the filling container is divided into at least four segments.

[0041] 7 is a perspective view showing a schematic view of a filled container in a magnetic refrigeration apparatus according to the second embodiment, showing one segment of filled container 80.

[0042] A flow path partition 87 that controls the direction of the flow path is installed inside the filled container 80, and the heat exchange fluid flows through the flow path inside the filled container 80 like the circulating flow 74. The flow path is filled with, for example, granular magnetic working material (not shown), and the heat exchange fluid flows through the gaps therein.

[0043] Next, a cooling operation by the magnetic refrigeration device 200 in this embodiment will be described. In this embodiment, the cold head 71 is cooled by the magnetic field generated by the magnetic field generating device 100 and the magnetocaloric effect of the magnetic working material. More specifically, the operation is as follows.

[0044] When the magnetic field generator 100 rotates around the shaft 90, the filled container 80 is fixed, so that the magnetic working material inside the filled container 80 is repeatedly magnetized and demagnetized at regular intervals in accordance with the rotational movement of the magnetic field generator 100. As can be seen from Figure 6, when the magnetic field generator 100 rotates, each divided segment of the filled container 80 is magnetized only when the magnetic pole of the magnetic field generator 100 comes into contact with that segment, and the other segments are demagnetized. The heat exchange fluid circulating in the magnetic refrigerator 200 flows into the filled container 80 through these pipes and transports heat by exchanging heat with the magnetic working material inside.

[0045] As shown in FIG. 5 , the segment in which the magnetic working material is excited is connected to pipes 83 and 84 outside the movable valve 81 by a flow path control plate 82. The heat exchange fluid that has exchanged heat with the heated magnetic working material returns to the pump 72 via pipe 84. The heat exchange fluid then passes through the heat exhaust heat exchanger 73, where the heat is discharged to the outside. The heat exchange fluid then enters the movable valve 81 via pipe 85. At this time, pipes 85 and 86 are connected by the flow path control plate 82 to the demagnetized segment, i.e., the region where the temperature of the magnetic working material has decreased. The heat exchange fluid, whose temperature has decreased by passing through the low-temperature segment, flows through pipe 86 to the cold head 71, where the cold head 71 is cooled by the heat exchange fluid. The heat exchange fluid then flows through pipe 83 from the movable valve 81 to the filled container 80.

[0046] In this way, the segments that are heated / cooled are switched in synchronization with the rotation of the magnetic field generating device 100, and at the same time, the flow path control plate 82 inside the movable valve 81 switches the flow path, so that high-temperature heat moves to the heat exchanger 73 for exhaust heat, and cold heat is transported to the cold head 71, thereby cooling the cold head 71.

[0047] In this embodiment, the magnetic working material is gadolinium (Gd), and the permanent magnet is NdFe. 14 Although we used neodymium magnets with B as the main phase, iron for the soft magnetic core and yoke, and water for the heat exchange fluid, other materials may be used. For example, other materials for the magnetic working material include La(Fe,Si), a metamagnetic material with a high magnetocaloric effect. 13 Also, Nd2Fe is applicable to permanent magnets. 14 It is also possible to use rare earth magnets in which neodymium (Nd) with a B-type crystal structure is replaced with inexpensive rare earth elements such as La or Ce. The soft magnetic core and yoke can be made of ferromagnetic materials that allow magnetic flux to pass through, such as iron, cobalt, or nickel.

[0048] [Third embodiment] The third embodiment is an example of the configuration of the magnetic field generating device 100 when there are only two blocks with magnetic pole portions. Since the third embodiment is a modified example of the first embodiment, the differences will be mainly described, and overlapping descriptions will be omitted.

[0049] FIG. 8 is a perspective view of the magnetic field generating device according to the third embodiment.

[0050] The basic configuration of this embodiment is the same as that of the first embodiment, but this embodiment has only one set of magnetic pole parts, and there are only two blocks 101 and 102 that have magnetic pole parts. Magnetic flux passes from the base yoke 10 through multiple yokes 11, 12, and 13 of block 101, is concentrated in the soft magnetic core 1-F, and enters block 102 through the spatial gap. From there, it flows to the base yoke 10 through multiple yokes 14, 15, and 18.

[0051] In this embodiment, as in the first embodiment, the Halbach array configuration of the magnetic pole section concentrates magnetic flux in the soft magnetic core, generating a strong magnetic field in the air gap. When applied to magnetic refrigeration device 200, it can be implemented in the same configuration as magnetic refrigeration device 200 of the second embodiment, and by rotating around rotation axis 91, periodic magnetization / demagnetization states can be achieved in cylindrical filled container 80.

[0052] Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations described in the embodiments, and various modifications are possible within the scope of the technical concept of the present invention. In addition, some or all of the configurations described in the embodiments may be combined and applied. [Explanation of symbols]

[0053] 1-A~E, 2-A~E, 3-B~E, 4-A~E...Permanent magnet, 1-F, 2-F, 3-F, 4-F...soft magnetic core, 10...base yoke, 11, 12, 13, 14, 15, 16, 17, 18...yoke, 50, 51...spatial gap, 71...Cold head, 72...pump, 73... Waste heat exchanger, 74…Circulating flow 80...filled container, 81... Movable valve, 82...flow path control plate, 83, 84, 85, 86...Plumbing, 87...channel divider, 90...shaft, 91...rotation axis, 100...magnetic field generator, 101, 102, 103... blocks, 200...Magnetic refrigeration device

Claims

1. A magnetic field generating device having at least one pair of magnetic pole parts arranged opposite each other across a spatial gap, The magnetic pole portion is composed of a soft magnetic material and a permanent magnet, At least two of the magnetic pole portions are magnetically connected by a common yoke; A magnetic field generating device characterized in that at least two of the magnetic pole portions connected to the common yoke each have N (N≧2) magnetic flux routes between them and the common yoke connected by a magnetic material.

2. In claim 1, The magnetic pole portion has at least N permanent magnets arranged around the core of the soft magnetic material, the permanent magnet of one of the pair of magnetic pole portions is magnetized in a direction that magnetizes the soft magnetic core to a first polarity, A magnetic field generating device characterized in that the permanent magnet of the other of the pair of magnetic pole portions is magnetized in a direction that magnetizes the soft magnetic core to a second polarity.

3. In claim 2, A magnetic field generating device characterized in that at least one magnetic pole part having a core of the soft magnetic material magnetized to the first polarity and at least one magnetic pole part having a core of the soft magnetic material magnetized to the second polarity are magnetically connected by the common yoke.

4. In claim 1, A magnetic field generating device characterized in that N=3.

5. In claim 1, A magnetic field generating device characterized in that N=4.

6. In claim 1, The magnetic field generating device, wherein the magnetic body includes a yoke connecting the common yoke and the permanent magnet of the magnetic pole portion.

7. In claim 1, The magnetic field generating device, characterized in that the magnetic body includes the permanent magnet of the magnetic pole portion that contacts the common yoke.

8. In claim 1, The magnetic field generating device, characterized in that the magnetic body includes a permanent magnet connecting between the common yoke and the permanent magnet of the magnetic pole portion.

9. In claim 1, In the magnetic pole portion having N magnetic flux routes between the magnetic pole portion and the common yoke, at least N permanent magnets are arranged around the core of the soft magnetic material, the magnetic body includes a yoke connecting the common yoke and the permanent magnet of the magnetic pole portion, A magnetic field generating device characterized in that each of the permanent magnets arranged on at least two faces of the soft magnetic core that do not face either the common yoke or the spatial gap is connected to the common yoke by the yoke.

10. In claim 9, A magnetic field generating device characterized in that each of the permanent magnets arranged on three surfaces of the soft magnetic core that do not face the common yoke or the spatial gap is connected to the common yoke by the yoke.

11. A magnetic refrigeration device using the magnetic field generating device according to any one of claims 1 to 10, a rotation mechanism that rotates the magnetic field generating device; a filling container at least a portion of which is disposed within the spatial gap sandwiched between the pair of magnetic pole portions of the magnetic field generating device; a pump for circulating a heat exchange fluid; a cold head cooled by the heat exchange fluid; a heat rejection heat exchanger that rejects heat from the heat exchange fluid; a movable valve that controls the flow of the heat exchange fluid in conjunction with the movement of the rotating mechanism, The magnetic field generating device rotates around a predetermined axis, The filling container is filled with a magnetic working material, the filling vessel, the pump, the cold head, the exhaust heat exchanger, and the movable valve are connected by piping to form a circulation path through which the heat exchange fluid circulates; A magnetic refrigeration apparatus, characterized in that the cold head is cooled by the magnetic field generated by the magnetic field generator and the magnetocaloric effect of the magnetic working material.

12. In claim 11, A magnetic refrigeration apparatus characterized in that the filling container is divided into at least four segments.

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