Rotary magnetic array device and magnetic freezing system

Abstract

To reduce a mechanical input to a device by reducing torque pulsation of a motor by a higher order.SOLUTION: A rotation magnetic array device comprises: a magnetic field generation part rotatable with a rotation axis as a center and generating a magnetic field by arranging plural magnetic poles; and plural magnetic material parts including plural heat generation parts for warming and cooling heat according to rotation of the magnetic generation part. The plural magnetic material parts are arranged in a circumferential manner to simultaneously include a magnetic material part opposite to a center of any of plural magnetic poles, a magnetic material part opposite to any of the plural magnetic poles but not opposite to the center of the magnetic pole, and a magnetic material part opposite to any two of the plural magnetic poles.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rotating magnetic array device and a magnetic refrigeration system. [Background technology]

[0002] Patent Document 1 describes a magnetic refrigeration device that includes a rotatable magnetic field generating unit, a heat generating unit that is provided on the outer periphery of the magnetic field generating unit, and a yoke that is provided on the outer periphery of the heat generating unit, wherein the magnetic field generating unit has a plurality of permanent magnets arranged in a Halbach array along the rotational direction, and the heat generating unit has a plurality of ducts that are arranged along the rotational direction, and a plurality of magnetic working units that are housed in each of the plurality of ducts and each contain a magnetic working material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-17484 Summary of the Invention [Problem to be solved by the invention]

[0004] A rotating magnetic array device is known that can rotate around a rotation axis and includes a magnetic field generating unit that generates a magnetic field by arranging multiple magnetic poles, and multiple magnetic material units that include multiple heat generating units that generate heat and cold in response to the rotation of the magnetic field generating unit. In such a rotating magnetic array device, the multiple magnetic material units may be arranged circumferentially so as to simultaneously include a magnetic material unit facing the center of one of the multiple magnetic poles and a magnetic material unit facing the gap between any two of the multiple magnetic poles. Alternatively, the multiple magnetic material units may be arranged circumferentially so as to simultaneously include a magnetic material unit facing one of the multiple magnetic poles but not the center of that pole, and a magnetic material unit facing the gap between any two of the multiple magnetic poles. However, with such a configuration, the torque pulsation of the motor cannot be reduced by increasing the order of the motor, and therefore the mechanical input to the device cannot be reduced.

[0005] An object of the present invention is to reduce the torque pulsation of a motor by increasing the order of the torque pulsation, thereby reducing the mechanical input to the device. [Means for solving the problem]

[0006] With this objective in mind, the present invention provides a rotating magnetic array device that is rotatable around a rotation axis and includes a magnetic field generating unit that generates a magnetic field by arranging a plurality of magnetic poles, and a plurality of magnetic material units that include a plurality of heat generating units that generate heat and cold in accordance with the rotation of the magnetic field generating unit, the plurality of magnetic material units being arranged circumferentially so as to be able to simultaneously include a magnetic material unit facing the center of any one of the plurality of magnetic poles, a magnetic material unit facing any one of the plurality of magnetic poles but not the center of that magnetic pole, and a magnetic material unit facing the space between any two of the plurality of magnetic poles.

[0007] The rotary magnetic array device may be one in which the arrangement relationship between the plurality of magnetic material portions and the plurality of magnetic poles is not rotationally symmetric. In this case, the plurality of magnetic material portions may be a prime number of magnetic material portions.

[0008] The plurality of magnetic material portions may include a plurality of non-heat generating portions that do not generate heat or cold. In this case, the magnetic susceptibility of the non-heat generating portions may be substantially equal to the magnetic susceptibility of the heat generating portions. The rotating magnetic array device may further include a magnetic susceptibility adjuster that changes the magnetic susceptibility of the plurality of non-heat-generating units in response to changes in the magnetic susceptibility of the plurality of heat-generating units. In this case, the magnetic susceptibility adjuster may change the magnetic susceptibility of each of the plurality of non-heat-generating units so as to minimize the current flowing through the motor that rotates the magnetic field generating unit. The magnetic susceptibility adjuster may also change the magnetic susceptibility of each of the plurality of non-heat-generating units when each of the plurality of non-heat-generating units faces one of the plurality of magnetic poles. Furthermore, the magnetic susceptibility adjuster may change the magnetic susceptibility of each of the plurality of non-heat-generating units by inserting a magnetic material into each of the plurality of non-heat-generating units in an amount corresponding to the amount of magnetic material in the plurality of heat-generating units.

[0009] Each of the plurality of magnetic poles may be a magnetic pole made of a magnetic body arranged on the side of the magnetic material portion facing the magnet arrangement made of the plurality of magnets with different orientations. In this case, each of the plurality of magnetic poles may be a magnetic pole whose width on the opposing magnetic material portion side is shorter than its width on the magnet array side. Furthermore, the rotating magnetic array device may be one in which the width of the opposing magnetic material portions of the magnetic poles is greater than the width of the magnetic working portions of the opposing magnetic material portions. Furthermore, the rotating magnetic array device may be one in which the distance between the surface of the magnetic pole and the magnetic working portion of the magnetic material portion adjacent to the magnetic material portion facing the surface of the magnetic pole is longer than the distance between the surface of the magnetic pole and the magnetic working portion of the magnetic material portion facing the surface of the magnetic pole. Furthermore, the multiple magnets may include a first magnet that is located closer to the rotation axis than the magnetic pole and is oriented in the direction of the magnetic pole or the direction of the rotation axis, and second and third magnets that are arranged on either side of the magnetic pole on a circumference on which the magnetic pole is located, centered on the rotation axis, and are oriented in the direction of the magnetic pole.

[0010] The present invention also provides a magnetic refrigeration system including any one of the above rotating magnetic array devices and a cold energy extraction device that extracts cold energy when any one of the plurality of heat generating units generates cold energy.

[0011] The multiple heat generating sections may include multiple heat supplying sections that supply hot and cold heat to the outside, and multiple non-heat supplying sections that do not supply hot and cold heat to the outside, and the cold heat extraction device may not extract cold heat even if any of the multiple non-heat supplying sections generates cold heat. [Effects of the Invention]

[0012] According to the present invention, torque pulsation of the motor can be reduced by increasing the order of the torque pulsation, thereby reducing the mechanical input to the device. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing a configuration example of a rotating magnetic array device according to an embodiment of the present invention; [Figure 2] 10 is a graph showing a torque ratio when no dummy is provided. [Figure 3] 10 is a graph showing the relationship between the magnetic susceptibility of an AMR and the magnetic susceptibility of a dummy at which torque is minimized. [Figure 4] FIG. 2 is a perspective view of a second example of the haptic sense presentation device according to the first embodiment. [Figure 5] 10 is a graph showing the torque ratio relative to the magnetic susceptibility of an AMR when the magnetic susceptibility of a dummy is variable. [Figure 6] FIG. 10 is a diagram showing a rotating magnetic array device in which 13 magnetic material portions are arranged. [Figure 7] FIG. 10 is a diagram showing a rotating magnetic array device in which 16 magnetic material portions are arranged. [Figure 8] FIG. 1 is a diagram showing a rotating magnetic array device in which 17 magnetic material portions are arranged. [Figure 9] FIG. 10 is a diagram showing a rotating magnetic array device in which 24 magnetic material portions are arranged. [Figure 10]10 is a graph showing a cogging torque waveform versus the number of magnetic material portions. [Figure 11] FIG. 10 is a diagram showing the relationship between the number of magnetic material portions and the cogging torque ratio. [Figure 12] FIG. 10 is a diagram showing a part of a rotary magnetic array device in which the half tip dimension of the central magnetic pole is set to 2 mm. [Figure 13] FIG. 10 is a diagram showing a part of a rotary magnetic array device when the half tip dimension of the central magnetic pole is set to 10 mm. [Figure 14] FIG. 10 is a diagram showing a part of a rotary magnetic array device in which the half tip dimension of the central magnetic pole is set to 12 mm. [Figure 15] FIG. 10 is a diagram showing a part of a rotary magnetic array device when the half tip dimension of the central magnetic pole is set to 18 mm. [Figure 16] 10 is a graph showing the relationship between the half tip dimension of the central magnetic pole and the torque ratio. [Figure 17] 10 is a graph showing the relationship between the half tip dimension of the central magnetic pole and the magnetic flux density ratio. [Figure 18] 1 is a diagram illustrating a configuration example of a magnetic refrigeration system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0015] [Background and Overview of the Implementation Form] Many of the freezers used in refrigerators and other appliances employ a vapor compression refrigeration cycle that uses gaseous refrigerants such as alternative fluorocarbon gases, raising concerns about the impact of emissions of alternative fluorocarbon gases on global warming. Against this backdrop, magnetic refrigeration technology, which utilizes the magnetocaloric effect, which changes its own temperature in response to changes in the applied magnetic field, has attracted attention.

[0016] Specifically, the magnetocaloric effect is the phenomenon whereby heat is generated when a magnet is brought close to a magnetic material, and the temperature drops when the magnet is removed from the magnetic material. Magnetic refrigeration technology is a technology that uses this magnetocaloric effect to generate low temperatures. Historically, magnetic refrigeration technology has been researched and developed as a technology to generate ultra-low or cryogenic temperatures that are difficult to achieve using vapor compression methods. This is because electron spin disturbance is significant at high temperatures, requiring an extremely strong magnetic field to achieve large temperature changes, and the magnetocaloric effect itself weakens at room temperature. A method called AMR (Active Magnetic Refrigeration) has been developed to solve these problems.

[0017] In an AMR, the magnetic material is housed in a spherical shape or other form to ensure a flow path for the heat transport medium (hereinafter simply referred to as the "medium") inside the magnetic working unit, and an inlet and outlet for the medium are provided at both ends of the magnetic working unit. Four processes are then repeated: (1) applying a magnetic field, (2) transporting heat to the high-temperature side using the medium, (3) removing the magnetic field, and (4) transporting cold to the low-temperature side using the medium. By repeating these processes, the AMR works by storing the cold generated by the magnetic refrigeration effect within the magnetic material itself, gradually creating a larger temperature gradient.

[0018] In order to apply a magnetic refrigerator to a household refrigerator or the like, it is necessary to increase the coefficient of performance (COP), and therefore a magnetic array that repeatedly creates a large magnetic flux density difference and reduces mechanical input is required.

[0019] Therefore, in this embodiment, the magnetic material parts are arranged around the rotating magnetic poles so that they simultaneously include a magnetic material part facing the center of one of the magnetic poles, a magnetic material part facing one of the magnetic poles but not the center of that magnetic pole, and a magnetic material part facing the space between any two of the magnetic poles.

[0020] [Rotating magnetic array device] 1 is a diagram showing an example of the configuration of a rotating magnetic array device 1 according to this embodiment. As shown in the figure, the rotating magnetic array device 1 includes a rotating shaft 10, a rotor 20, and a stator 30.

[0021] The rotating shaft 10 is, for example, a shaft connected to a motor (not shown), and rotates as the motor rotates due to a motor current that is a current flowing through the motor.

[0022] The rotor 20 is provided so as to be rotatable around the rotation axis 10 . The rotor 20 generates a magnetic field by arranging four magnetic poles 21a to 21d. In the drawings, the magnetic poles are referred to as 21a to 21d, but when there is no need to distinguish between them, they will be referred to as magnetic pole 21. Also, while four magnetic poles 21 are provided here, this is not limiting. For example, another even number of magnetic poles 21, such as two or six, or another multiple number of magnetic poles 21 may be provided. The rotor 20 is rotatable around the rotation axis, and is an example of a magnetic field generating unit that generates a magnetic field by arranging multiple magnetic poles.

[0023] Rotor 20 has yoke 22 through which magnetic field lines generated by the arrangement of magnetic poles 21a to 21d pass on the inner circumferential side of magnetic poles 21a to 21d. Yoke 22 is made of a ferromagnetic material with high relative permeability, such as steel designated as SS400 in Japanese Industrial Standards (JIS).

[0024] The stator 30 has 23 magnetic material portions 31a-31w and a yoke 32. While the magnetic material portions 31a-31w are shown in the drawings, they will be referred to as magnetic material portions 31 when there is no need to distinguish between them. While 23 magnetic material portions 31 are provided here, this is not a limitation. For example, a plurality of magnetic material portions 31 other than 23 may be provided. The number of magnetic material portions 31 will be described in detail later. The magnetic material portions 31a-31w are arranged on a circumference centered on the rotating shaft 10 along the direction of rotation of the rotor 20, i.e., the direction of rotation of the magnetic poles 21a-21d. Each of the magnetic material portions 31a-31w contains a magnetic working portion 33. The magnetic working portion 33 contains a magnetic working material whose temperature changes with changes in the strength of the magnetic field applied by the rotor 20. The magnetic working portions 33 generate heat or cold when the rotor 20 rotates. That is, the magnetic material parts 31a to 31w are heat generating parts (AMR) that generate heat or cold when the strength of the magnetic field applied to each of the plurality of magnetic working parts 33 by the rotor 20 rotating around the rotation axis 10 repeatedly increases and decreases, causing the temperature of the plurality of magnetic working parts 33 to repeatedly increase and decrease. The 23 magnetic material parts 31a to 31w are an example of a plurality of heat generating parts that generate heat and cold in response to the rotation of the magnetic field generating part, an example of a plurality of magnetic material parts including a plurality of heat generating parts, and an example of a plurality of magnetic material parts arranged circumferentially.

[0025] The yoke 32 passes the magnetic field lines of the magnetic field generated by the rotor 20 on the outer side of the magnetic material portions 31a to 31w, centered on the rotating shaft 10. The yoke 32 is also made of a ferromagnetic material with high relative permeability, such as a steel material designated as SS400 in the JIS standard. As a result, the magnetic field lines pass through the yoke 32 on the outer side of the magnetic material portions 31, which prevents or suppresses the magnetic field generated by the rotor 20 from spreading too far outward from the magnetic material portions 31.

[0026] The configuration of magnetic poles 21a to 21d will now be described. Magnetic pole 21a includes permanent magnets 23a to 25a, central magnetic pole 26a, and non-magnetic bodies 27a and 28a. Magnetic pole 21b includes permanent magnets 23b to 25b, central magnetic pole 26b, and non-magnetic bodies 27b and 28b. Magnetic pole 21c includes permanent magnets 23c to 25c, central magnetic pole 26c, and non-magnetic bodies 27c and 28c. Magnetic pole 21d includes permanent magnets 23d to 25d, central magnetic pole 26d, and non-magnetic bodies 27d and 28d.

[0027] 1, the orientation (magnetization direction) of each of the permanent magnets 23a to 25a, 23b to 25b, 23c to 25c, and 23d to 25d is indicated by a thick arrow. As such, the permanent magnets 23a to 25a, 23b to 25b, 23c to 25c, and 23d to 25d are a magnet array consisting of a plurality of magnets with different orientations.

[0028] The central magnetic poles 26a to 26d are magnetic poles made of a magnetic material and arranged on the magnetic material portion 31 side facing the permanent magnets 23a to 25a, 23b to 25b, 23c to 25c, and 23d to 25d, respectively. Note that Fig. 1 shows the following boundary lines within the central magnetic poles 26a to 26d: a boundary line connecting the right sides of the permanent magnets 23a and 24a, a boundary line connecting the top sides of the permanent magnets 23b and 24b, a boundary line connecting the left sides of the permanent magnets 23c and 24c, and a boundary line connecting the bottom sides of the permanent magnets 23d and 24d. The central magnetic poles 26a to 26d may be configured as separate bodies separated by the boundary lines shown therein, or may be configured as a single body regardless of the boundary lines shown therein.

[0029] Non-magnetic bodies 27a to 27d are members arranged to support the overhanging portions of permanent magnets 24a to 24d, respectively, and non-magnetic bodies 28a to 28d are members arranged to support the overhanging portions of permanent magnets 25a to 25d, respectively. The non-magnetic bodies 27a to 27d and 28a to 28d may be made of aluminum, resin, or the like, for example.

[0030] Permanent magnet 23a has an N pole and an S pole. The N pole of permanent magnet 23a is arranged on the outer periphery of permanent magnet 23a centered around rotation shaft 10, and the S pole of permanent magnet 23a is arranged on the inner periphery of permanent magnet 23a centered around rotation shaft 10. Permanent magnet 23a is an example of a first magnet that is located closer to the rotation axis than the magnetic pole and is oriented in the direction of the magnetic pole. Each of the permanent magnets 24a, 25a has a north pole and a south pole. The north poles of the permanent magnets 24a, 25a are arranged on the side of the central magnetic pole 26a on a circumference centered on the rotation axis 10, and the south poles of the permanent magnets 24a, 25a are arranged on the opposite side of the central magnetic pole 26a on a circumference centered on the rotation axis 10. The permanent magnets 24a, 25a are arranged on either side of the magnetic pole on the circumference centered on the rotation axis, and are an example of second and third magnets oriented in the direction of the magnetic pole.

[0031] Permanent magnet 23b has an N pole and an S pole. The N pole of permanent magnet 23b is disposed on the inner periphery of permanent magnet 23b around rotation shaft 10, and the S pole of permanent magnet 23b is disposed on the outer periphery of permanent magnet 23b around rotation shaft 10. Permanent magnet 23b is an example of a first magnet that is located closer to the rotation axis than the magnetic pole and is oriented in the direction of the rotation axis. Each of the permanent magnets 24b and 25b has a north pole and a south pole. The north poles of the permanent magnets 24b and 25b are arranged on the side of the central magnetic pole 26b on a circumference centered on the rotation axis 10, and the south poles of the permanent magnets 24b and 25b are arranged on the opposite side of the central magnetic pole 26b on a circumference centered on the rotation axis 10. The permanent magnets 24b and 25b are arranged on either side of the magnetic pole on the circumference centered on the rotation axis, and are an example of second and third magnets oriented in the direction of the magnetic pole.

[0032] Magnetic pole 21c is arranged in a state where magnetic pole 21a is reversed from side to side, and magnetic pole 21d is arranged in a state where magnetic pole 21b is reversed from top to bottom.

[0033] Here, consider a case where the magnetic pole 21a faces the magnetic material portion 31a as shown in FIG. 1 when the rotor 20 rotates.

[0034] In this case, the magnetic field lines from the north pole of central magnetic pole 26a pass through magnetic material portion 31a, yoke 32, and magnetic material portions 31f and 31g before entering the south pole of central magnetic pole 26b. Similarly, the magnetic field lines from the north pole of central magnetic pole 26a pass through magnetic material portion 31a, yoke 32, and magnetic material portions 31r and 31s before entering the south pole of central magnetic pole 26d. Furthermore, the magnetic field lines from the north pole of central magnetic pole 26b pass through yoke 22 before entering the south pole of central magnetic pole 26a, and the magnetic field lines from the north pole of central magnetic pole 26d pass through yoke 22 before entering the south pole of central magnetic pole 26a. Therefore, a magnetic circuit consisting of central magnetic pole 26a, yoke 32, central magnetic pole 26b, and yoke 22, and a magnetic circuit consisting of central magnetic pole 26a, yoke 32, central magnetic pole 26d, and yoke 22 are formed.

[0035] In this case, the magnetic field lines from the north pole of central magnetic pole 26c pass through magnetic material portion 31l, yoke 32, and magnetic material portion 31g to enter the south pole of central magnetic pole 26b. The magnetic field lines from the north pole of central magnetic pole 26c pass through magnetic material portion 31m, yoke 32, and magnetic material portion 31r to enter the south pole of central magnetic pole 26d. The magnetic field lines from the north pole of central magnetic pole 26b pass through yoke 22 to enter the south pole of central magnetic pole 26c, and the magnetic field lines from the north pole of central magnetic pole 26d pass through yoke 22 to enter the south pole of central magnetic pole 26c. Therefore, a magnetic circuit consisting of central magnetic pole 26c, yoke 32, central magnetic pole 26b, and yoke 22, and a magnetic circuit consisting of central magnetic pole 26c, yoke 32, central magnetic pole 26d, and yoke 22 are formed.

[0036] As a result, the strength of the magnetic field applied to the magnetic material portions 31a, 31b, 31f, 31g, 31h, 31l, 31m, 31q, 31r, 31s, and 31w approaches a maximum over time. Meanwhile, the strength of the magnetic field applied to the magnetic material portions 31c-31e, 31i-31k, 31n-31p, and 31t-31v approaches a minimum (close to zero) over time. In this case, the magnetic material portion 31a is an example of a magnetic material portion facing the center of one of the multiple magnetic poles. The magnetic material portions 31b, 31f, 31g, 31h, 31l, 31m, 31q, 31r, 31s, and 31w are examples of magnetic material portions facing one of the multiple magnetic poles but not the center of that pole. Furthermore, the magnetic material portions 31c to 31e, 31i to 31k, 31n to 31p, and 31t to 31v are examples of magnetic material portions that face between any two of the plurality of magnetic poles.

[0037] Next, consider a case where the rotor 20 rotates (360 / 23) degrees from the state shown in FIG. 1 and the magnetic pole 21a faces the magnetic material portion 31b. In this case, the strength of the magnetic field applied to the magnetic material portions 31b, 31c, 31g, 31h, 31i, 31m, 31n, 31r, 31s, 31t, and 31a approaches a maximum over time. On the other hand, the strength of the magnetic field applied to the magnetic material portions 31d-31f, 31j-31l, 31o-31q, and 31u-31w approaches a minimum (close to zero) over time. In this case, the magnetic material portion 31b is an example of a magnetic material portion facing the center of one of the multiple magnetic poles. The magnetic material parts 31c, 31g, 31h, 31i, 31m, 31n, 31r, 31s, 31t, and 31a are examples of magnetic material parts that face one of the multiple magnetic poles but not the center of that magnetic pole. Furthermore, the magnetic material parts 31d to 31f, 31j to 31l, 31o to 31q, and 31u to 31w are examples of magnetic material parts that face the gap between any two of the multiple magnetic poles.

[0038] Consider the case where the rotor 20 rotates (360 / 23×N) degrees from the state shown in FIG. 1 and the magnetic pole 21a faces one of the magnetic material portions 31c-31w (N=2, 3, ..., 22). In this case as well, the strength of the magnetic field applied to the magnetic material portion 31 facing one of the magnetic poles 21a-21d approaches a maximum over time. On the other hand, the strength of the magnetic field applied to the magnetic material portion 31 not facing any of the magnetic poles 21a-21d approaches a minimum (approaching zero) over time.

[0039] Therefore, when the rotor 20 rotates around the rotation axis 10, the strength of the magnetic field applied to each of the magnetic material parts 31a-31w repeatedly increases and decreases. When the magnetic field applied to each of the magnetic material parts 31a-31w repeatedly increases and decreases, the temperature of the magnetic working material repeatedly increases and decreases, and when the temperature of the magnetic working material decreases, the magnetic working material can generate cold.

[0040] In the drawings, the permanent magnets are referred to as 23a-23d, 24a-24d, 25a-25d, central magnetic poles 26a-26d, and non-magnetic bodies 27a-27d, 28a-28d. However, when there is no need to distinguish between them, they will be referred to as permanent magnets 23, 24, 25, central magnetic pole 26, and non-magnetic bodies 27, 28.

[0041] Although all 23 magnetic material portions 31 in FIG. 1 are AMRs, they do not necessarily have to be AMRs. Below, we consider a case where the 23 magnetic material portions 31 are composed of four AMRs and 19 dummies. Here, the dummies may be magnetic material portions 31 that contain a magnetic material but do not generate heat or cold when the rotor 20 rotates. In this case, the four AMRs are an example of a plurality of heat generating portions that generate heat and cold in response to the rotation of the magnetic field generating portion, and the 19 dummies are an example of a plurality of non-heat generating portions that do not generate heat or cold. Alternatively, the dummies may be magnetic material portions 31 that contain a magnetic material and generate heat or cold when the rotor 20 rotates but do not supply the generated heat or cold to the outside. In this case, the four AMRs are an example of a plurality of heat supplying portions that supply heat and cold to the outside, and the 19 dummies are an example of a plurality of non-heat supplying portions that do not supply heat or cold to the outside.

[0042] 1, if the motor current flowing through the motor that rotates the rotating shaft 10 is large, the input power also increases, and the COP deteriorates. Here, since the motor current is almost proportional to the torque, it is desirable to minimize the torque.

[0043] Figure 2 is a graph showing the torque ratio when no dummies are placed. In other words, this graph shows the torque ratio versus the magnetic susceptibility of the AMR when four AMRs are placed and 19 dummies are not placed. Here, the magnetic susceptibility of the AMR is shown as a percentage. A magnetic susceptibility of 0% is non-magnetic, like air, and a magnetic susceptibility of 100% is ferromagnetic, like SS400. The torque ratio is also the value normalized with the maximum torque set to 1. This graph shows that the torque tends to increase as the magnetic susceptibility of the AMR increases.

[0044] Figure 3 is a graph showing the relationship between the magnetic susceptibility of the AMR and the magnetic susceptibility of the dummy at which torque is minimized. This graph shows that torque decreases when the magnetic susceptibility of the AMR and the magnetic susceptibility of the dummy are roughly equal.

[0045] Figure 4 is a graph showing the torque ratio relative to the magnetic susceptibility of the AMR when the magnetic susceptibility of the dummy is variable. This graph shows the torque ratio when four AMRs and 19 dummies are arranged and the magnetic susceptibility relationship of Figure 3 is used. This graph shows that the torque is significantly lower than that of Figure 2. In other words, it is preferable to make the magnetic susceptibility of the 19 dummies approximately equal to that of the four AMRs.

[0046] Figure 5 is a graph showing the torque ratio versus the magnetic susceptibility of the AMR and the dummy. The thin solid line represents the torque ratio when the dummy's magnetic susceptibility is 20%, the normal solid line represents the torque ratio when the dummy's magnetic susceptibility is 50%, and the thick solid line represents the torque ratio when the dummy's magnetic susceptibility is 80%. This graph shows that as the magnetic susceptibility of the AMR increases, the magnetic susceptibility of the dummy that minimizes torque also increases.

[0047] Therefore, in this embodiment, the magnetic susceptibility of the dummy is changed in accordance with the estimated magnetic susceptibility of the AMR, and torque is minimized, thereby controlling the motor current to be minimized.

[0048] In this embodiment, the AMR is assumed to be a cascade arrangement of multiple magnetic working materials with different Curie temperatures (temperatures at which the magnetocaloric effect is maximized). In this case, it is desirable to operate the multiple magnetic working materials at their respective Curie temperatures. The magnetic working materials are ferromagnetic below their Curie temperatures and paramagnetic above their Curie temperatures. When the magnetocaloric effect is achieved by varying the magnetic force acting on the AMR, the magnetic working materials constituting the AMR are in a state where they change between ferromagnetic and paramagnetic states near their Curie temperatures. Therefore, since it is difficult to accurately determine the magnetic susceptibility of the AMR, the above definition refers to the "estimated magnetic susceptibility of the AMR."

[0049] The rotating magnetic array device 1 reduces torque pulsation by making the magnetic susceptibility of 23 AMRs or dummies approximately the same. Specifically, the rotating magnetic array device 1 reduces torque pulsation by changing the magnetic susceptibility of the dummy to approach that of the AMR in accordance with changes in the ferromagnetic and paramagnetic materials near the Curie temperature of the magnetic working material that makes up the AMR.

[0050] Here, a possible mechanism for changing the magnetic susceptibility of the dummy is a magnetic susceptibility adjustment mechanism that changes the magnetic susceptibility of the dummy by inserting or removing a ferromagnetic material (iron) placed inside the dummy. In this case, the magnetic susceptibility adjustment mechanism is an example of a magnetic susceptibility adjustment unit that changes the magnetic susceptibility of the multiple non-heat-generating units in accordance with changes in the magnetic susceptibility of the multiple heat-generating units. The magnetic susceptibility adjustment mechanism is also an example of a magnetic susceptibility adjustment unit that changes the magnetic susceptibility of each non-heat-generating unit by inserting a magnetic material into each of the multiple non-heat-generating units in an amount corresponding to the amount of magnetic material in the multiple heat-generating units.

[0051] Furthermore, if the magnetic susceptibility of the dummy is equivalent to that of the AMR, torque pulsation is reduced and a smaller motor current is required. In contrast, if the magnetic susceptibility of the AMR increases, torque pulsation increases, requiring a larger motor current. Therefore, the magnetic susceptibility adjustment mechanism changes the magnetic susceptibility of the dummy to reduce the motor current. In this case, the magnetic susceptibility adjustment mechanism is an example of a magnetic susceptibility adjustment unit that changes the magnetic susceptibility of each of the multiple non-heat-generating units so as to minimize the current flowing through the motor that rotates the magnetic field generating unit.

[0052] Furthermore, when the rotor 20 rotates, the magnetic flux changes only where the magnetic poles 21 and the magnetic material portions 31 face each other, affecting torque. Therefore, the magnetic susceptibility adjustment mechanism changes the magnetic susceptibility of the dummy at least in the area where the magnetic poles 21 approach. Particularly during startup of the magnetic refrigeration system, the temperature of the medium in contact with the AMR is nearly constant, and most of the temperature is outside the Curie temperature of the magnetic working material that makes up the AMR. Therefore, the magnetic susceptibility adjustment mechanism can reduce input power by changing the magnetic susceptibility of the dummy until the temperature of the medium approaches the Curie temperature of the magnetic working material. In this case, the magnetic susceptibility adjustment mechanism is an example of a magnetic susceptibility adjustment mechanism that changes the magnetic susceptibility of each of the multiple non-heat-generating portions when it faces one of the multiple magnetic poles.

[0053] In the above, of the 23 magnetic material portions 31, 4 are AMR and 19 are dummy, but the number of AMR and dummies is not limited to these. For example, 8 may be AMR and 15 may be dummy.

[0054] Furthermore, although 23 magnetic material portions 31 are arranged in the above example, the number is not limited to this. For example, it is also conceivable to arrange 13, 16, 17, 24, etc. magnetic material portions 31. 6 is a diagram showing the rotating magnetic array device 1 in which 13 magnetic material sections 31 are arranged. Here, 13 magnetic material sections 31a to 31m are arranged. 7 is a diagram showing the rotary magnetic array device 1 in which 16 magnetic material sections 31 are arranged. Here, 16 magnetic material sections 31a to 31p are arranged. 8 is a diagram showing the rotating magnetic array device 1 in which 17 magnetic material parts 31 are arranged. Here, 17 magnetic material parts 31a to 31q are arranged. 9 is a diagram showing a rotating magnetic array device 1 in which 24 magnetic material sections 31 are arranged. Here, 24 magnetic material sections 31a to 31x are arranged.

[0055] Fig. 10 is a graph showing the waveform of cogging torque, which is the pulsation of torque required for external driving, versus the number of magnetic material portions 31. Here, the waveforms of cogging torque are shown for the case where 23 magnetic material portions 31 are arranged as in Fig. 1, as well as for the cases where 13, 17, and 24 magnetic material portions 31 are arranged as in Figs. 6, 8, and 9. Note that the waveform of cogging torque for the case where 16 magnetic material portions 31 are arranged as in Fig. 7 is not shown because the torque pulsation width would be extremely large.

[0056] FIG. 11 is a diagram showing the relationship between the number of magnetic material portions 31 and the cogging torque ratio. Here, the cogging torque ratio is a value obtained by normalizing the cogging torque, with the cogging torque of the rotating magnetic array device 1 shown in FIG. 7 being set to 100%. In this case, the cogging torque is defined as the average value of the absolute values ​​of the torque pulsation amplitude in the cogging torque waveform of FIG. 10. Generally, cogging torque is defined by the torque pulsation amplitude, and its average value is 0. Therefore, here, in order to evaluate the impact of input torque reduction, the cogging torque is evaluated not by the torque pulsation amplitude itself but by the average value of the absolute values ​​of the torque pulsation amplitude.

[0057] This figure shows that the cogging torque is significantly reduced when a prime number of magnetic material portions 31 (13, 17, or 23) is arranged. The order of the cogging torque is determined by the least common multiple of the number of magnetic poles 21 and the number of magnetic material portions 31. Therefore, when a prime number of magnetic material portions 31 is arranged, the order of the cogging torque increases. This is because, as the order of the cogging torque increases, the change in energy per rotation decreases, thereby reducing torque pulsation. The prime number may also be smaller than 13, such as 5 or 11. When a prime number of magnetic material portions 31 is arranged in this manner, the arrangement of the magnetic material portions 31 and the magnetic poles 21 is not rotationally symmetric, as shown in FIGS. 1, 6, and 8. In this case, rotational symmetry means that when a magnetic material part 31 facing a certain magnetic pole 21 is rotated so that it faces another magnetic pole 21, and the arrangement of the magnetic material parts 31 with respect to the magnetic pole 21 after rotation is made the same as the arrangement of the magnetic pole 21 before rotation, the arrangement of multiple magnetic material parts 31 may overlap.

[0058] Furthermore, from this figure, it can be seen that the cogging torque when 24 magnetic material parts 31 are arranged is also suppressed to a certain extent, although not as much as when a prime number of magnetic material parts 31 are arranged. Furthermore, when 24 magnetic material parts 31 are arranged, it can be said that a magnetic material part 31 facing the center of any one of the magnetic poles 21, a magnetic material part 31 facing any one of the magnetic poles 21 but not the center of that magnetic pole 21, and a magnetic material part 31 facing the space between any two of the magnetic poles 21 are simultaneously present.

[0059] On the other hand, this figure also shows that the cogging torque when 16 magnetic material portions 31 are arranged is significantly larger than the cogging torque when 13, 17, 23, or 24 magnetic material portions 31 are arranged. Therefore, in order to reduce the cogging torque, it is not preferable to arrange 16 magnetic material portions 31. Furthermore, when 16 magnetic material portions 31 are arranged, it can be said that a magnetic material portion 31 facing the center of any one of the magnetic poles 21 and a magnetic material portion 31 facing the space between any two of the magnetic poles 21 are simultaneously present. However, it cannot be said that a magnetic material portion 31 facing any one of the magnetic poles 21 but not the center of that magnetic pole 21 is simultaneously present.

[0060] Furthermore, although the above did not specify the dimensions of the tip portion of the central magnetic pole 26 of the magnetic pole 21 on the magnetic material portion 31 side (hereinafter referred to as the "tip dimension") and the dimension of the rear end portion on the permanent magnet 23 side (hereinafter referred to as the "rear end dimension"), these dimensions will be considered here. Note that, hereinafter, it is assumed that the cross section of the central magnetic pole 26 in FIG. 1 is line-symmetrical about the radial center line, and the tip dimension will be described as the dimension of the portion on one side of the center line as "1 / 2 tip dimension FD," and the rear end dimension will be described as the portion on one side of the center line as "1 / 2 rear end dimension BD." However, the cross section of the central magnetic pole 26 in FIG. 1 does not have to be line-symmetrical.

[0061] First, it is assumed that the half rear end dimension BD of the central magnetic pole 26 is 18 mm, and the radius of the magnetic working portion 33 is 7 mm. FIG. 12 is a diagram showing a part of the rotary magnetic array device 1 when the half tip dimension FD of the central magnetic pole 26 is set to 2 mm. FIG. 13 is a diagram showing a part of the rotary magnetic array device 1 when the half tip dimension FD of the central magnetic pole 26 is set to 10 mm. FIG. 14 is a diagram showing a part of the rotary magnetic array device 1 when the half tip dimension FD of the central magnetic pole 26 is set to 12 mm. 15 is a diagram showing a part of the rotary magnetic array device 1 when the half tip dimension FD of the central magnetic pole 26 is set to 18 mm. Here, the half tip dimension FD and the half rear end dimension BD of the central magnetic pole 26 are equal, so the tip portion of the central magnetic pole 26 has a shape composed only of a circular arc.

[0062] FIG. 16 is a graph showing the relationship between the half-tip dimension FD of the central magnetic pole 26 and the torque ratio. Here, the torque ratio is a value obtained by normalizing the torque, with the maximum torque in the torque pulsation being 1. The torque pulsation is the torque pulsation of the motor that rotates the magnetic pole 21. From this graph, it can be seen that the torque pulsation decreases when the half-tip dimension FD of the central magnetic pole 26 is 12 mm or less, as shown in FIGS. 12 to 14. That is, the torque pulsation decreases when the half-tip dimension FD of the central magnetic pole 26 is shorter than the half-rear end dimension BD of the central magnetic pole 26. Therefore, it is desirable that the central magnetic pole 26 be a magnetic pole whose front end dimension is shorter than its rear end dimension. This central magnetic pole 26 is an example of a magnetic pole in which the width on the opposing magnetic material portion side is shorter than the width on the magnet array side.

[0063] FIG. 17 is a graph showing the relationship between the half-tip dimension FD of the central magnetic pole 26 and the magnetic flux density ratio. Here, the magnetic flux density ratio is a value obtained by normalizing the magnetic flux density, with the maximum magnetic flux density being 1. The magnetic flux density is the magnetic flux density at the center of the air gap between the magnetic pole 21 and the magnetic material portion 31. From this graph, it can be seen that the magnetic flux density is low when the half-tip dimension FD of the central magnetic pole 26 is too short, as in FIG. 12, and high when the half-tip dimension FD of the central magnetic pole 26 is 10 mm to 12 mm, as in FIGS. 13 and 14. That is, the magnetic flux density is high when the half-tip dimension FD of the central magnetic pole 26 is longer than the radius of the magnetic working portion 33. This is because if the half-tip dimension FD of the central magnetic pole 26 is too short, sufficient magnetic flux cannot be applied to the magnetic working portion 33. Therefore, it is desirable that the central magnetic pole 26 has a tip dimension longer than the diameter of the magnetic working portion 33. Alternatively, when the magnetic working portion 33 is rectangular, it is desirable that the central magnetic pole 26 is a magnetic pole whose tip dimension is longer than the length of the opposing sides of the magnetic working portion 33. Such a central magnetic pole 26 is an example of a magnetic pole in which the width of the opposing magnetic material portion side of the magnetic pole is longer than the width of the magnetic working portion of the opposing magnetic material portion.

[0064] Furthermore, when the central magnetic pole 26 faces the magnetic material portion 31y, it is desirable that the surface of the central magnetic pole 26 be closer to the magnetic working portion 33y (see FIGS. 12 to 15) of the opposing magnetic material portion 31y than to the magnetic working portion 33z (see FIGS. 12 to 15) of the magnetic material portion 31z adjacent to the facing magnetic material portion 31y. In other words, it is desirable that the distance between the surface of the central magnetic pole 26 and the magnetic working portion 33z is longer than the distance between the surface of the central magnetic pole 26 and the magnetic working portion 33y. Here, the surface of the central magnetic pole 26 may be a surface located on the outer side of the central magnetic pole 26. Specifically, in FIGS. 12 to 14, the surface of the central magnetic pole 26 may be a circumferential surface at the tip, axial surfaces depicted as the left and right sides, and oblique surfaces connecting these. In FIG. 15, it may be a circumferential surface at the tip, and axial surfaces depicted as the left and right sides. The distance from the magnetic working portion 33 may be measured based on the center of the magnetic working portion 33. This central magnetic pole 26 is an example of a magnetic pole in which the distance between the surface of the magnetic pole and the magnetic working portion of the adjacent magnetic material portion facing the magnetic pole is longer than the distance between the surface of the magnetic pole and the magnetic working portion of the adjacent magnetic material portion. For example, if BD is increased, the magnetic working portion 33z may be closer to the surface of the central magnetic pole 26 than the magnetic working portion 33y. In this case, the magnetic flux does not converge to the magnetic working portion 33y but also flows to the magnetic working portion 33z, preventing a strong magnetic flux from acting, which is undesirable.

[0065] [Magnetic Refrigeration System] 18 is a diagram showing an example of the configuration of a magnetic refrigeration system 100 according to this embodiment. As shown in the figure, the magnetic refrigeration system 100 includes a rotating magnetic array device 1 and a cold energy extraction device 40.

[0066] The rotating magnetic array device 1 is the device described with reference to Figures 1 to 17. That is, the rotating magnetic array device 1 includes a magnetic pole 21, magnetic material portions 311 and 312, and a yoke 32.

[0067] The magnetic pole 21 is any one of the plurality of magnetic poles 21. Here, the plurality of magnetic poles 21 are the magnetic poles 21a to 21d in the examples of FIGS.

[0068] The magnetic material part 311 is a magnetic material part 31 among the plurality of magnetic material parts 31 that generates heat when the magnetic pole 21 approaches. The magnetic material part 312 is a magnetic material part 31 among the plurality of magnetic material parts 31 that generates cold when the magnetic pole 21 moves away. Here, the plurality of magnetic material parts 31 are magnetic material parts 31a to 31w in the example of FIG. 1, magnetic material parts 31a to 31m in the example of FIG. 6, magnetic material parts 31a to 31q in the example of FIG. 8, and magnetic material parts 31a to 31x in the example of FIG. 9. In this case, the magnetic material part 311 is an example of a heat generating part that generates heat in response to the rotation of the magnetic field generating part, and the magnetic material part 312 is an example of a heat generating part that generates cold in response to the rotation of the magnetic field generating part.

[0069] Alternatively, the magnetic material part 311 may be a magnetic material part 31 that generates heat when the magnetic pole 21 approaches and supplies the heat to the outside. The magnetic material part 312 may be a magnetic material part 31 that generates cold when the magnetic pole 21 moves away and supplies the cold to the outside. In this case, the magnetic material part 311 is an example of a heat supply part that supplies hot heat to the outside, and the magnetic material part 312 is an example of a heat supply part that supplies cold to the outside. Conversely, even if the magnetic material part 31 generates heat when the magnetic pole 21 approaches, it does not become the magnetic material part 311 if it does not supply the hot heat to the outside. Also, even if the magnetic material part 31 generates cold when the magnetic pole 21 moves away, it does not become the magnetic material part 312 if it does not supply the cold to the outside. In other words, the magnetic material part 31, which is an example of a non-heat supply part that does not supply hot heat to the outside, does not become the magnetic material part 311, and the magnetic material part 31, which is an example of a non-heat supply part that does not supply cold heat to the outside, does not become the magnetic material part 312.

[0070] The cold heat extraction device 40 includes a cooler 41, a pump 42, and a waste heat exchanger 43. The cold heat extraction device 40 extracts cold generated by the magnetic working unit 33 included in the magnetic material unit 312 by circulating a medium between the magnetic material units 311 and 312, and cools the object to be cooled 44 in the cooler 41. Here, water, for example, may be used as the medium. The cold heat extraction device 40 is an example of a cold heat extraction device that extracts cold when any of multiple heat generating units generates cold. The cold heat extraction device is also an example of a cold heat extraction device that does not extract cold even when multiple non-heat supplying units generate cold.

[0071] In order to circulate a medium between the cold heat extraction device 40 and the magnetic material parts 311, 312, a low-temperature pipe 51 is connected to the cooler 41 side of the magnetic material parts 311, 312, and a high-temperature pipe 52 is connected to the exhaust heat exchanger 43 side of the magnetic material parts 311, 312. That is, the magnetic material parts 311, 312 are connected to the cooler 41 on the low-temperature side via the low-temperature pipe 51, and to the exhaust heat exchanger 43 on the high-temperature side via the high-temperature pipe 52.

[0072] Specifically, a low-temperature pipe 511 is connected to the cooler 41 side of the magnetic material part 311, and a high-temperature pipe 521 is connected to the exhaust heat exchanger 43 side of the magnetic material part 311. A low-temperature pipe 512 is connected to the cooler 41 side of the magnetic material part 312, and a high-temperature pipe 522 is connected to the exhaust heat exchanger 43 side of the magnetic material part 312.

[0073] 18, the strength of the magnetic field applied to the magnetic material part 311 becomes a maximum over time, and the temperature of the magnetic working material contained in the magnetic working part 33 stored in the magnetic material part 311 also becomes a maximum over time. On the other hand, the strength of the magnetic field applied to the magnetic material part 312 becomes a minimum (almost zero) over time, and the temperature of the magnetic working material contained in the magnetic working part 33 stored in the magnetic material part 312 also becomes a minimum over time.

[0074] In this case, the medium that has undergone heat exchange in the exhaust heat exchanger 43 is sent by the pump 42 through the high-temperature pipe 522 to the magnetic material section 312, where it is cooled by the magnetic working section 33 whose temperature has been lowered in the magnetic material section 312. The medium that has been cooled in the magnetic material section 312 is then sent through the low-temperature pipe 512 to the cooler 41, where it cools the object to be cooled 44. The medium that has cooled the object to be cooled 44 in the cooler 41 is then sent through the low-temperature pipe 511 to the magnetic material section 311, where it is heated by the magnetic working section 33 whose temperature has been raised in the magnetic material section 311. The medium that has been heated in the magnetic material section 311 is then sent through the high-temperature pipe 521 to the exhaust heat exchanger 43, where it is subjected to heat exchange.

[0075] [Effects of the embodiment] In this embodiment, a magnetic material part facing the center of one of the magnetic poles, a magnetic material part facing one of the magnetic poles but not the center of that magnetic pole, and a magnetic material part facing the space between any two magnetic poles are arranged around the rotating magnetic poles simultaneously. This makes it possible to suppress excessive concentration of magnetic flux, reduce torque pulsation of the motor that rotates the magnetic poles by increasing the order of the motor, and reduce the mechanical input to the device. [Explanation of symbols]

[0076] 1...rotating magnetic array device, 10...rotating shaft, 20...rotor, 21...magnetic pole, 22...yoke, 23-25...permanent magnet, 26...central magnetic pole, 30...stator, 31...magnetic material part, 32...yoke, 33...magnetic working part, 40...cold heat extraction device, 41...cooler, 42...pump, 43...waste heat exchanger

Claims

1. a magnetic field generating unit that is rotatable around a rotation axis and that generates a magnetic field by arranging a plurality of magnetic poles; a plurality of magnetic material units including a plurality of heat generating units that generate heat and cold in response to rotation of the magnetic field generating unit; Equipped with A rotating magnetic array device, wherein the plurality of magnetic material portions are arranged circumferentially so as to be able to simultaneously include a magnetic material portion facing the center of any one of the plurality of magnetic poles, a magnetic material portion facing any one of the plurality of magnetic poles but not facing the center of that magnetic pole, and a magnetic material portion facing the space between any two of the plurality of magnetic poles.

2. 2. The rotary magnetic array device according to claim 1, wherein the arrangement relationship between said plurality of magnetic material portions and said plurality of magnetic poles is not rotationally symmetric.

3. 3. The rotary magnetic array device according to claim 2, wherein said plurality of magnetic material portions is a prime number of magnetic material portions.

4. 2. The rotating magnetic array device according to claim 1, wherein said plurality of magnetic material portions include a plurality of non-heat generating portions that do not generate heat or cold.

5. 5. The rotating magnetic array device according to claim 4, wherein the magnetic susceptibility of said plurality of non-heat generating portions is substantially equal to the magnetic susceptibility of said plurality of heat generating portions.

6. 5. The rotating magnetic array device according to claim 4, further comprising a magnetic susceptibility adjusting section that changes the magnetic susceptibility of said plurality of non-heat generating sections in accordance with changes in the magnetic susceptibility of said plurality of heat generating sections.

7. 7. The rotating magnetic array device according to claim 6, wherein the magnetic susceptibility adjusting unit changes the magnetic susceptibility of each of the plurality of non-heat generating units so as to minimize the current flowing through a motor for rotating the magnetic field generating unit.

8. 7. The rotating magnetic array device according to claim 6, wherein the magnetic susceptibility adjusting unit changes the magnetic susceptibility of each of the plurality of non-heat generating portions when the non-heat generating portion faces one of the plurality of magnetic poles.

9. 7. The rotating magnetic array device of claim 6, wherein the magnetic susceptibility adjustment unit changes the magnetic susceptibility of each of the plurality of non-heat-generating units by inserting an amount of magnetic material into each of the plurality of non-heat-generating units corresponding to the amount of magnetic material in the plurality of heat-generating units.

10. 2. The rotating magnetic array device according to claim 1, wherein each of the plurality of magnetic poles is a magnetic pole made of a magnetic material arranged on an opposing magnetic material portion of the plurality of magnetic material portions relative to a magnet arrangement consisting of a plurality of magnets of different orientations.

11. 11. The rotary magnetic array device according to claim 10, wherein each of the plurality of magnetic poles has a width on the opposing magnetic material portion side that is shorter than a width on the magnet array side.

12. 11. The rotating magnetic array device according to claim 10, wherein the width of said magnetic pole on the side of said opposing magnetic material portion is greater than the width of the magnetic working portion of said opposing magnetic material portion.

13. 11. The rotating magnetic array device according to claim 10, wherein a distance between the surface of the magnetic pole and a magnetic working portion of a magnetic material portion adjacent to the opposing magnetic material portion is longer than a distance between the surface of the magnetic pole and the magnetic working portion of the opposing magnetic material portion.

14. 11. The rotating magnetic array device of claim 10, wherein the plurality of magnets include a first magnet that is located closer to the rotation axis than the magnetic pole and is oriented in the direction of the magnetic pole or the direction of the rotation axis, and second and third magnets that are arranged on either side of the magnetic pole on a circumference on which the magnetic pole is located, centered on the rotation axis, and are oriented in the direction of the magnetic pole.

15. A rotating magnetic array device according to any one of claims 1 to 14, a cold heat extraction device that extracts cold heat when any of the plurality of heat generating units generates cold heat; A magnetic refrigeration system comprising:

16. The plurality of heat generating units include a plurality of heat supplying units that supply the hot heat and the cold heat to the outside, and a plurality of heat non-supplying units that do not supply the hot heat and the cold heat to the outside, 16. The magnetic refrigeration system according to claim 15, wherein the cold energy extraction device does not extract cold energy even if any of the plurality of non-heat supplying parts generates cold energy.

Images