Synchronous control method and system for magnetic refrigerating machine, and magnetic refrigerating machine

Abstract

The present invention discloses a synchronous control method, system and magnetic refrigeration machine for a magnetic refrigeration machine. In this method, the lowest magnetic field moment of the magnetic field systems corresponding to the respective magnetic regenerators in the same magnetic regenerator module is detected; in the case where the detected lowest magnetic field moments are not synchronized, the advanced magnetic field system is maintained in the lowest magnetic field state, and when the last magnetic field system reaches the lowest magnetic field state moment, the periodic changes of the magnetic field systems corresponding to the respective magnetic regenerators in the same magnetic regenerator module are synchronously started. This method simply and effectively ensures the synchronous operation of the magnetic regenerator module.

Description

Technical Field

[0001] The present invention relates to the technical field of magnetic refrigeration, and particularly relates to a synchronous control method and system for a magnetic refrigerator and a magnetic refrigerator. Background Art

[0002] This section aims to provide background or context for the embodiments described in the claims. The description herein is not admitted to be prior art merely by including it in this section.

[0003] Magnetic refrigeration is a solid-state refrigeration technology and a new refrigeration technology that is expected to replace the traditional gas compression refrigeration technology.

[0004] In a magnetic refrigerator, the magnetic regenerators connected in parallel can increase the refrigeration power, and the magnetic regenerators connected in series can increase the temperature difference between the cold end and the hot end. It is necessary to ensure that the magnetic fields in the series or parallel magnetic regenerators are synchronous so that the magnetic refrigerator operates normally. Summary of the Invention

[0005] The present invention provides a synchronous control method and system for a magnetic refrigerator and a magnetic refrigerator.

[0006] The present invention adopts the following technical solution: A synchronous control method for a magnetic refrigerator, the magnetic refrigerator includes a first magnetic regenerator module and a second magnetic regenerator module, the cold end of the first magnetic regenerator module is used to connect the first end of the load, and the cold end of the second magnetic regenerator module is used to connect the second end of the load; characterized in that,

[0007] Both the first magnetic regenerator module and the second magnetic regenerator module include the same number of magnetic regenerators connected in series or both include the same number of magnetic regenerators connected in parallel. The magnetic refrigerator further includes a magnetic field system provided corresponding to each magnetic regenerator, and the magnetic field system is used to provide a periodically changing magnetic field to the corresponding magnetic regenerator; wherein, the magnetic field system corresponding to the first magnetic regenerator module and the magnetic field system corresponding to the second magnetic regenerator module are kept with a constant phase difference of 180° in a one-to-one correspondence; the synchronous control method includes:

[0008] Detect the lowest magnetic field moment of the magnetic field systems corresponding to each magnetic regenerator in the same magnetic regenerator module;

[0009] In the case that the detected lowest magnetic field moments are not synchronous, keep the advanced magnetic field system in the lowest magnetic field state, and synchronously start the periodic change of the magnetic field systems corresponding to each magnetic regenerator in the same magnetic regenerator module when the last magnetic field system reaches the lowest magnetic field state moment.

[0010] In some embodiments, a single said magnetic field system includes an inner-ring magnetic field excitation structure and an outer-ring magnetic field excitation structure. Both the inner-ring magnetic field excitation structure and the outer-ring magnetic field excitation structure are in the shape of a cylindrical barrel. The inner-ring magnetic field excitation structure is coaxially arranged inside the outer-ring magnetic field excitation structure;

[0011] The inner-ring magnetic field excitation structure is fixedly arranged, and the outer-ring magnetic field excitation structure rotates around its axis. Alternatively, the outer-ring magnetic field excitation structure is fixedly arranged, and the inner-ring magnetic field excitation structure rotates around its axis.

[0012] In some embodiments, both the inner-ring magnetic field excitation structure and the outer-ring magnetic field excitation structure are Halbach magnetic aggregation structures.

[0013] In some embodiments, within one rotation period of either the inner-ring magnetic field excitation structure or the outer-ring magnetic field excitation structure, the magnetic field generated by the corresponding magnetic field system monotonically increases and then monotonically decreases.

[0014] In some embodiments, the performance parameters of each said magnetic regenerator are the same.

[0015] The present invention adopts the following technical solution: A synchronous control system for a magnetic refrigerator. The magnetic refrigerator includes a first magnetic regenerator module and a second magnetic regenerator module. The cold end of the first magnetic regenerator module is used to connect the first end of the load, and the cold end of the second magnetic regenerator module is used to connect the second end of the load;

[0016] Both the first magnetic regenerator module and the second magnetic regenerator module include the same number of magnetic regenerators connected in series or both include the same number of magnetic regenerators connected in parallel. The magnetic refrigerator further includes a magnetic field system provided corresponding to each magnetic regenerator. The magnetic field system is used to provide a periodically changing magnetic field to the corresponding magnetic regenerator. Wherein, the phase difference between any one magnetic field system in the first magnetic regenerator module and one magnetic field system in the second magnetic regenerator module is constantly 180°. The synchronous control system includes:

[0017] A plurality of sensors, respectively used to detect the lowest magnetic field moments of the magnetic field systems corresponding to the magnetic regenerators in the same magnetic regenerator module;

[0018] A controller, used to, when the detected lowest magnetic field moments are not synchronized, keep the advanced magnetic field system in the lowest magnetic field state until the last magnetic field system reaches the lowest magnetic field state moment, and then synchronously start the periodic change of the magnetic field systems corresponding to the magnetic regenerators in the same magnetic regenerator module.

[0019] In some embodiments, a single said magnetic field system includes an inner-ring magnetic field excitation structure and an outer-ring magnetic field excitation structure. Both the inner-ring magnetic field excitation structure and the outer-ring magnetic field excitation structure are in the shape of a cylindrical barrel, and the inner-ring magnetic field excitation structure is coaxially arranged inside the outer-ring magnetic field excitation structure.

[0020] The inner-ring magnetic field excitation structure is fixedly arranged, and the outer-ring magnetic field excitation structure rotates around its axis. Alternatively, the outer-ring magnetic field excitation structure is fixedly arranged, and the inner-ring magnetic field excitation structure rotates around its axis.

[0021] The controller is specifically configured to stop the rotation of the movable magnetic field excitation structure in the leading magnetic field system, so as to keep the corresponding magnetic field system in the lowest magnetic field state.

[0022] In some embodiments, both the inner-ring magnetic field excitation structure and the outer-ring magnetic field excitation structure are Halbach magnetic aggregation structures.

[0023] In some embodiments, within one rotation period of either the inner-ring magnetic field excitation structure or the outer-ring magnetic field excitation structure, the magnetic field generated by the corresponding magnetic field system increases monotonically and then decreases monotonically.

[0024] The present invention adopts the following technical solution: a magnetic refrigerator, which includes a first magnetic regenerator module and a second magnetic regenerator module. The cold end of the first magnetic regenerator module is used to connect to the first end of the load, and the cold end of the second magnetic regenerator module is used to connect to the second end of the load.

[0025] Both the first magnetic regenerator module and the second magnetic regenerator module include the same number of magnetic regenerators connected in series or both include the same number of magnetic regenerators connected in parallel. The magnetic refrigerator further includes a magnetic field system provided corresponding to each magnetic regenerator, and the magnetic field system is used to provide a periodically changing magnetic field to the corresponding magnetic regenerator. Among them, the magnetic field systems corresponding to the first magnetic regenerator module and the second magnetic regenerator module maintain a constant phase difference of 180° with each other in a one-to-one correspondence.

[0026] The magnetic refrigerator further includes the aforementioned synchronous control system.

[0027] Taking the moment of the lowest magnetic field of the magnetic field system as the starting moment of a cycle, the leading magnetic field system is paused, so as to synchronously start each magnetic field system when the lagging magnetic field system reaches the moment of the lowest magnetic field, thereby conveniently and reliably ensuring that the operation of each magnetic field system is synchronous. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the magnetic refrigerator according to an embodiment of the present invention.

[0029] Figure 2 It is a schematic structural diagram of the magnetic field system and the corresponding sensor in the magnetic refrigeration machine according to an embodiment of the present invention.

[0030] Figure 3a It is a waveform diagram of the magnetic field intensity of a pair of magnetic field systems according to an embodiment of the present invention.

[0031] Figure 3b It is a schematic diagram of the working state of the magnetic regenerator corresponding to a pair of magnetic field systems according to an embodiment of the present invention.

[0032] Figure 4 It is a flowchart of the synchronous control method of the magnetic refrigeration machine according to an embodiment of the present invention.

[0033] The reference numerals are as follows: C1 to C4, the first to fourth magnetic field systems; H1 to H4, the first to fourth magnetic regenerators; DW, the sensor; DW1, the first sensor; DW2, the second sensor; F, the load; TBKZ, the controller; Ca, the outer ring magnetic field excitation structure; Cb, the inner ring magnetic field excitation structure. Specific Embodiments

[0034] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0035] Figure 1 It is a schematic structural diagram of the magnetic refrigeration machine according to an embodiment of the present invention. Refer to Figure 1 , the magnetic refrigeration machine includes a first magnetic regenerator module and a second magnetic regenerator module. The cold end of the first magnetic regenerator module is used to connect the first end of the load F, and the cold end of the second magnetic regenerator module is used to connect the second end of the load F.

[0036] Both the first magnetic regenerator module and the second magnetic regenerator module include the same number of magnetic regenerators connected in series or both include the same number of magnetic regenerators connected in parallel.

[0037] Specifically, Figure 1 In the illustrated embodiment, the first magnetic regenerator module includes a first magnetic regenerator H1 and a third magnetic regenerator H3 connected in series, and the second magnetic regenerator module includes a second magnetic regenerator H2 and a fourth magnetic regenerator H4 connected in series.

[0038] The magnetic refrigeration machine further includes a magnetic field system provided corresponding to each magnetic regenerator, and the magnetic field system is used to provide a periodically changing magnetic field to the corresponding magnetic regenerator; wherein, the magnetic field system corresponding to the first magnetic regenerator module and the magnetic field system corresponding to the second magnetic regenerator module are kept in a constant phase difference of 180° in a one-to-one correspondence.

[0039] Specifically, Figure 1In the illustrated embodiment, the first magnetic field system C1 corresponds to the first magnetic regenerator H1, the second magnetic field system C2 corresponds to the second magnetic regenerator H2, the third magnetic field system C3 corresponds to the third magnetic regenerator H3, and the fourth magnetic field system C4 corresponds to the fourth magnetic regenerator H4. The phase difference between the first magnetic field system C1 and the second magnetic field system C2 is constantly 180°, and the phase difference between the third magnetic field system C3 and the fourth magnetic field system C4 is constantly 180°.

[0040] For example, a mechanical linkage method can be adopted to ensure that the phase difference between the first magnetic field system C1 and the second magnetic field system C2 is constantly 180°, and the phase difference between the third magnetic field system C3 and the fourth magnetic field system C4 is constantly 180°.

[0041] Reference Figure 4 , the synchronous control method includes the following steps.

[0042] Step 101, detect the lowest magnetic field moment of the magnetic field systems corresponding to the respective magnetic regenerators in the same magnetic regenerator module;

[0043] Step 102, in the case where the detected lowest magnetic field moments are not synchronized, keep the leading magnetic field system in the lowest magnetic field state, and synchronously start the periodic change of the magnetic field systems corresponding to the respective magnetic regenerators in the same magnetic regenerator module when the last magnetic field system reaches the lowest magnetic field state moment.

[0044] Combined with Figure 1 and Figure 3a , the first sensor DW1 detects the magnetic field intensity of the first magnetic field system C1 in the area where the first magnetic regenerator H1 is located, and the second sensor DW2 detects the magnetic field intensity of the third magnetic field system C3 in the area where the third regenerator is located.

[0045] It should be noted that the time difference from the detected lowest magnetic field state moment to the start of the leading magnetic field system is ignored.

[0046] The first sensor DW1 and the second sensor DW2 send the detection information to the controller TBKZ. When the first magnetic field system C1 reaches the lowest magnetic field state before the third magnetic field system C3, the controller TBKZ controls the first magnetic field system C1 to remain in the lowest magnetic field state. After the third magnetic field system C3 reaches the lowest magnetic field state, the controller TBKZ controls the first magnetic field system C1 and the third magnetic field system C3 to start the periodic change synchronously from the lowest magnetic field state. When the third magnetic field system C3 reaches the lowest magnetic field state before the first magnetic field system C1, the controller TBKZ controls the third magnetic field system C3 to remain in the lowest magnetic field state. After the first magnetic field system C1 reaches the lowest magnetic field state, the controller TBKZ controls the first magnetic field system C1 and the third magnetic field system C3 to start the periodic change synchronously from the lowest magnetic field state.

[0047] Figure 3a The moment indicated by the arrow is the moment of the lowest magnetic field (which can also be called the zero magnetic field moment).

[0048] Combined with Figure 3a and Figure 3b , an operating cycle can be divided into four stages.

[0049] In the first stage, the first magnetic regenerator H1, the second magnetic regenerator H2, the third magnetic regenerator H3, and the fourth magnetic regenerator H4 are in the transition stage, and the fluid inside the first magnetic regenerator H1, the second magnetic regenerator H2, the third magnetic regenerator H3, and the fourth magnetic regenerator H4 is stationary.

[0050] In the second stage, when the first magnetic regenerator H1 and the third magnetic regenerator H3 are in the demagnetization state (cold blow), the magnetic refrigerants of the first magnetic regenerator H1 and the third magnetic regenerator H3 absorb heat. The second magnetic regenerator H2 and the fourth magnetic regenerator H4 are in the magnetization stage (hot blow). The heat exchange fluid flows from the first magnetic regenerator H1, through the third magnetic regenerator H3, the cold end load F, and the fourth magnetic regenerator H4 in sequence, and then flows to the second magnetic regenerator H2.

[0051] The third stage is the transition period. The first magnetic regenerator H1, the second magnetic regenerator H2, the third magnetic regenerator H3, and the fourth magnetic regenerator H4 are in the transition stage, and the fluid inside the first magnetic regenerator H1, the second magnetic regenerator H2, the third magnetic regenerator H3, and the fourth magnetic regenerator H4 is stationary.

[0052] In the fourth stage, the first magnetic regenerator H1 and the third magnetic regenerator H3 are in the magnetization state (hot blow, generating heat), and the second magnetic regenerator H2 and the fourth magnetic regenerator H4 are in the demagnetization state (cold blow, absorbing heat). The heat exchange fluid flows from the second magnetic regenerator H2, through the fourth magnetic regenerator H4, the cold end load F, and the third magnetic regenerator H3 in sequence, and then flows to the first magnetic regenerator H1 to complete a cycle.

[0053] In some embodiments, referring to Figure 2 , a single said magnetic field system includes an inner ring magnetic field excitation structure Cb and an outer ring magnetic field excitation structure Ca. Both the inner ring magnetic field excitation structure Cb and the outer ring magnetic field excitation structure Ca are in the shape of a cylindrical barrel. The inner ring magnetic field excitation structure Cb is coaxially arranged inside the outer ring magnetic field excitation structure Ca; the inner ring magnetic field excitation structure Cb is fixedly arranged, and the outer ring magnetic field excitation structure Ca rotates around its axis, or the outer ring magnetic field excitation structure Ca is fixedly arranged, and the inner ring magnetic field excitation structure Cb rotates around its axis.

[0054] Figure 2 Shown is the cross-section of the inner ring magnetic field excitation structure Cb and the outer ring magnetic field excitation structure Ca. Figure 2The arrow directions in it are the magnetic field directions of the magnetic fields excited by the inner-ring magnetic field excitation structure Cb and the outer-ring magnetic field excitation structure Ca respectively. In Figure 2 the state shown, the magnetic field directions of the magnetic fields excited by the inner-ring magnetic field excitation structure Cb and the outer-ring magnetic field excitation structure Ca are opposite, and the magnetic field intensity reaches the lowest in the inner space of the inner-ring magnetic field excitation structure Cb (for setting the magnetic regenerator). Refer to Figure 3a , as one of the inner-ring magnetic field excitation structure Cb and the outer-ring magnetic field excitation structure Ca rotates, the magnetic field intensity in the inner space of the inner-ring magnetic field excitation structure Cb increases and decreases periodically. The sensor DW detects the magnetic field intensity in the inner space of the inner-ring magnetic field excitation structure Cb.

[0055] In a specific example, the outer-ring magnetic field excitation structure Ca is fixedly arranged, the inner-ring magnetic field excitation structure Cb rotates, the sensor DW is fixedly connected to the inner-ring magnetic field excitation structure Cb and rotates synchronously with it, and the position where the magnetic field detected by the sensor DW is the weakest corresponds to the lowest magnetic field state of the magnetic field system (which can be considered as zero magnetic field).

[0056] In some embodiments, the inner-ring magnetic field excitation structure Cb and the outer-ring magnetic field excitation structure Ca are both Halbach magnetic field aggregation structures.

[0057] In some embodiments, within one rotation period of any one of the inner-ring magnetic field excitation structure Cb or the outer-ring magnetic field excitation structure Ca, the magnetic field generated by the corresponding magnetic field system increases monotonically and then decreases monotonically.

[0058] In some embodiments, the performance parameters of each of the magnetic regenerators are the same.

[0059] Based on the same inventive concept, an embodiment of the present invention further provides a synchronous control system for a magnetic refrigerator. The magnetic refrigerator includes a first magnetic regenerator module and a second magnetic regenerator module. The cold end of the first magnetic regenerator module is used to connect to the first end of the load F, and the cold end of the second magnetic regenerator module is used to connect to the second end of the load F;

[0060] Both the first magnetic regenerator module and the second magnetic regenerator module include the same number of magnetic regenerators connected in series or both include the same number of magnetic regenerators connected in parallel. The magnetic refrigerator further includes a magnetic field system provided corresponding to each magnetic regenerator, and the magnetic field system is used to provide a periodically changing magnetic field to the corresponding magnetic regenerator; wherein, the phase difference between any one magnetic field system in the first magnetic regenerator module and one magnetic field system in the second magnetic regenerator module is constantly 180°; the synchronous control system includes:

[0061] A plurality of sensors, respectively used to detect the lowest magnetic field moments of the magnetic field systems corresponding to the magnetic regenerators in the same magnetic regenerator module.

[0062] A controller TBKZ is configured to, when the detected lowest magnetic field moments are asynchronous, maintain the advanced magnetic field system in the lowest magnetic field state until the last magnetic field system reaches the lowest magnetic field state, and then synchronously start the periodic changes of the magnetic field systems corresponding to the respective magnetic regenerators in the same magnetic regenerator module.

[0063] Multiple sensors are, for example Figure 1 the first sensor DW1 and the second sensor DW2 in

[0064] In some embodiments, a single said magnetic field system includes an inner ring magnetic field excitation structure Cb and an outer ring magnetic field excitation structure Ca. Both the inner ring magnetic field excitation structure Cb and the outer ring magnetic field excitation structure Ca are in the shape of a cylindrical barrel, and the inner ring magnetic field excitation structure Cb is coaxially arranged inside the outer ring magnetic field excitation structure Ca;

[0065] The inner ring magnetic field excitation structure Cb is fixedly arranged, and the outer ring magnetic field excitation structure Ca rotates around its axis, or the outer ring magnetic field excitation structure Ca is fixedly arranged, and the inner ring magnetic field excitation structure Cb rotates around its axis;

[0066] The controller TBKZ is specifically configured to stop the rotation of the movable magnetic field excitation structure in the advanced magnetic field system, so as to keep the corresponding magnetic field system in the lowest magnetic field state.

[0067] In some embodiments, both the inner ring magnetic field excitation structure Cb and the outer ring magnetic field excitation structure Ca are Halbach magnetic aggregation structures.

[0068] In some embodiments, within one rotation period of either the inner ring magnetic field excitation structure Cb or the outer ring magnetic field excitation structure Ca, the magnetic field generated by the corresponding magnetic field system monotonically increases and then monotonically decreases.

[0069] In some embodiments, the performance parameters of the respective magnetic regenerators are the same.

[0070] Based on the same inventive concept, an embodiment of the present invention further provides a magnetic refrigerator, which includes a first magnetic regenerator module and a second magnetic regenerator module. The cold end of the first magnetic regenerator module is used to connect to the first end of a load F, and the cold end of the second magnetic regenerator module is used to connect to the second end of the load F;

[0071] Both the first magnetic regenerator module and the second magnetic regenerator module include the same number of magnetic regenerators connected in series or both include the same number of magnetic regenerators connected in parallel. The magnetic refrigerator further includes a magnetic field system provided corresponding to each magnetic regenerator, and the magnetic field system is used to provide a periodically changing magnetic field to the corresponding magnetic regenerator; wherein, the magnetic field system corresponding to the first magnetic regenerator module and the magnetic field system corresponding to the second magnetic regenerator module maintain a constant phase difference of 180° in a one-to-one correspondence;

[0072] The magnetic refrigerator further includes the aforementioned synchronous control system.

[0073] Taking the moment of the lowest magnetic field of the magnetic field system as the starting moment of a cycle, the advanced magnetic field system is paused, and each magnetic field system is synchronously started again when the delayed magnetic field system reaches the moment of the lowest magnetic field, thereby conveniently and reliably ensuring the synchronous operation of each magnetic field system.

[0074] Each embodiment in the present invention is described in a progressive manner. For the same and similar parts between the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments.

[0075] The protection scope of the present invention is not limited to the above embodiments. Obviously, those skilled in the art can make various changes and deformations to the present invention without departing from the scope and spirit of the present invention. If these changes and deformations belong to the scope of the claims of the present invention and its equivalent technologies, the intention of the present invention also includes these changes and deformations.

Claims

1. A synchronous control method for a magnetic refrigeration machine, the magnetic refrigeration machine comprising a first magnetic regenerator module and a second magnetic regenerator module, wherein the cold end of the first magnetic regenerator module is used to connect to the first end of a load, and the cold end of the second magnetic regenerator module is used to connect to the second end of the load; characterized in that, both the first magnetic regenerator module and the second magnetic regenerator module include the same number of magnetic regenerators connected in series or both include the same number of magnetic regenerators connected in parallel, and the magnetic refrigeration machine further includes a magnetic field system provided corresponding to each magnetic regenerator, the magnetic field system being used to provide a periodically changing magnetic field to the corresponding magnetic regenerator; wherein, the magnetic field system corresponding to the first magnetic regenerator module and the magnetic field system corresponding to the second magnetic regenerator module are kept with a constant phase difference of 180° in a one-to-one correspondence; the synchronous control method includes: detecting the lowest magnetic field moment of the magnetic field systems corresponding to the magnetic regenerators in the same magnetic regenerator module; in the case where the detected lowest magnetic field moments are not synchronized, keeping the leading magnetic field system in the lowest magnetic field state, and synchronously starting the periodic change of the magnetic field systems corresponding to the magnetic regenerators in the same magnetic regenerator module when the last magnetic field system reaches the lowest magnetic field state moment.

2. The method according to claim 1, characterized in that, A single magnetic field system includes an inner ring magnetic field excitation structure and an outer ring magnetic field excitation structure, both the inner ring magnetic field excitation structure and the outer ring magnetic field excitation structure are in the shape of a cylindrical barrel, and the inner ring magnetic field excitation structure is coaxially arranged inside the outer ring magnetic field excitation structure; the inner ring magnetic field excitation structure is fixedly arranged, and the outer ring magnetic field excitation structure rotates around its axis, or, the outer ring magnetic field excitation structure is fixedly arranged, and the inner ring magnetic field excitation structure rotates around its axis.

3. The method according to claim 2, characterized in that Both the inner ring magnetic field excitation structure and the outer ring magnetic field excitation structure are Halbach magnetic field aggregation structures.

4. The method according to claim 2, wherein Within one rotation period of either the inner ring magnetic field excitation structure or the outer ring magnetic field excitation structure, the magnetic field generated by the corresponding magnetic field system monotonically increases and then monotonically decreases.

5. The method according to claim 1, wherein The performance parameters of each magnetic regenerator are the same.

6. A synchronous control system for a magnetic refrigeration machine, the magnetic refrigeration machine comprising a first magnetic regenerator module and a second magnetic regenerator module, wherein the cold end of the first magnetic regenerator module is used to connect to the first end of a load, and the cold end of the second magnetic regenerator module is used to connect to the second end of the load; characterized in that, both the first magnetic regenerator module and the second magnetic regenerator module include the same number of magnetic regenerators connected in series or both include the same number of magnetic regenerators connected in parallel, and the magnetic refrigeration machine further includes a magnetic field system provided corresponding to each magnetic regenerator, the magnetic field system being used to provide a periodically changing magnetic field to the corresponding magnetic regenerator; wherein, the magnetic field system corresponding to the first magnetic regenerator module and the magnetic field system corresponding to the second magnetic regenerator module are kept with a constant phase difference of 180° in a one-to-one correspondence; the synchronous control system includes: a plurality of sensors respectively used to detect the lowest magnetic field moment of the magnetic field systems corresponding to the magnetic regenerators in the same magnetic regenerator module; A controller, configured to keep an advanced magnetic field system in a lowest magnetic field state when the detected lowest magnetic field moments are out of synchronization, and to synchronously start the periodic changes of the magnetic field systems corresponding to the respective magnetic regenerators in the same magnetic regenerator module when the last magnetic field system reaches the lowest magnetic field state moment.

7. The synchronization control system according to claim 6, wherein A single said magnetic field system includes an inner ring magnetic field excitation structure and an outer ring magnetic field excitation structure. Both the inner ring magnetic field excitation structure and the outer ring magnetic field excitation structure are in the shape of a cylindrical barrel, and the inner ring magnetic field excitation structure is coaxially arranged inside the outer ring magnetic field excitation structure; The inner ring magnetic field excitation structure is fixedly arranged, and the outer ring magnetic field excitation structure rotates around its axis, or the outer ring magnetic field excitation structure is fixedly arranged, and the inner ring magnetic field excitation structure rotates around its axis; The controller is specifically configured to stop the rotation of the movable magnetic field excitation structure in the advanced magnetic field system, so as to keep the corresponding magnetic field system in the lowest magnetic field state.

8. The system according to claim 7, wherein Both the inner ring magnetic field excitation structure and the outer ring magnetic field excitation structure are Halbach magnetic field aggregation structures.

9. The system according to claim 7, wherein Within one rotation period of either the inner ring magnetic field excitation structure or the outer ring magnetic field excitation structure, the magnetic field generated by the corresponding magnetic field system monotonically increases and then monotonically decreases.

10. A magnetic refrigerator, comprising a first magnetic regenerator module and a second magnetic regenerator module. The cold end of the first magnetic regenerator module is used to connect to the first end of a load, and the cold end of the second magnetic regenerator module is used to connect to the second end of the load; characterized in that Both the first magnetic regenerator module and the second magnetic regenerator module include the same number of magnetic regenerators connected in series or both include the same number of magnetic regenerators connected in parallel. The magnetic refrigerator further includes a magnetic field system provided corresponding to each magnetic regenerator, and the magnetic field system is used to provide a periodically changing magnetic field to the corresponding magnetic regenerator; wherein, the phase difference between any one magnetic field system in the first magnetic regenerator module and one magnetic field system in the second magnetic regenerator module is constantly 180°; The magnetic refrigerator further includes a synchronization control system according to any one of claims 6 to 9.

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