Permanent magnet linear motor

Abstract

The utility model discloses a permanent magnet linear motor, and belongs to the technical field of motor equipment. A cooling liquid flowing cavity can be defined by the side faces of every two adjacent annular stator iron cores, the outer side face of the annular sealing piece and the inner side wall of the installation cavity, and the cooling liquid flowing cavities can be communicated with a liquid inlet of a first cooling liquid flow channel and a liquid outlet of a second cooling liquid flow channel which are formed in the motor shell. The cooling liquid flowing cavity can be defined by the side face of the annular stator iron core, the annular sealing piece and the motor shell, other parts do not need to be arranged in the motor to assist in forming the cooling liquid flowing cavity, the manufacturing cost of the motor is reduced, and miniaturization design of the motor is facilitated. Besides, the cooling liquid entering the cooling liquid flowing cavity from the liquid inlet of the first cooling liquid flow channel can effectively cool the stator assembly, the power density of the permanent magnet linear motor is improved, and the service life of the permanent magnet linear motor is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of motor equipment, and in particular to a permanent magnet linear motor. Background Art

[0002] A linear motor is an energy conversion device that converts electrical energy into mechanical energy through linear reciprocating motion. As motor power and power density increase, so does the amount of heat generated. The primary heat-generating components are concentrated around the permanent magnets and the outer stator. This can easily lead to failure of the linear motor's internal permanent magnets, coils, and other components due to excessive temperatures.

[0003] Therefore, there is an urgent need for a linear motor with a built-in cooling function to ensure the performance of the linear motor. Utility Model Content

[0004] The present invention provides a permanent magnet linear motor. This embodiment can solve the problem in the prior art of urgently needing a linear motor with a self-cooling function. The technical solution is as follows:

[0005] In one aspect, a permanent magnet linear motor is provided, comprising:

[0006] Motor housing, stator assembly, mover assembly and multiple annular seals;

[0007] The motor housing has a mounting cavity, and a first coolant flow channel and a second coolant flow channel both communicating with the mounting cavity, the first coolant flow channel having a plurality of liquid inlets, and the second coolant flow channel having a plurality of liquid outlets;

[0008] The stator assembly is fixed in the mounting cavity and is mounted on the movable assembly. The stator assembly includes: a plurality of annular stator cores distributed in an axial array along the mounting cavity, an annular seal is fixed between the side surfaces of each two adjacent annular stator cores near the edge area of ​​the movable assembly, and the annular seal is coaxially arranged with the annular stator cores;

[0009] Wherein, a coolant flow cavity is formed between the side surfaces of every two adjacent annular stator cores, the outer side surface of the annular seal and the inner side wall of the installation cavity, and the coolant flow cavity is respectively connected to one of the liquid inlets and one of the liquid outlets.

[0010] Optionally, a diverter plate distributed in the coolant flow cavity is fixed to the side surface of one of the annular stator cores in every two adjacent annular stator cores;

[0011] The diverter plate is used to separate the cooling liquid flow cavity into an inlet flow cavity communicating with the liquid inlet and an outlet flow cavity communicating with the liquid outlet.

[0012] Optionally, an annular guide plate distributed in the coolant flow cavity is further fixed to the side surface of one of the annular stator cores in every two adjacent annular stator cores;

[0013] Part of the guide plate is located in the liquid inlet flow cavity, and another part of the guide plate is located in the liquid outlet flow cavity.

[0014] Optionally, the first coolant flow channel includes: a first common flow channel and a plurality of first branch flow channels, the extension direction of the first common flow channel is parallel to the axial direction of the mounting cavity, the extension direction of each first branch flow channel intersects with the extension direction of the first common flow channel, and each first branch flow channel has the liquid inlet;

[0015] The second cooling liquid flow channel includes: a second common flow channel and multiple second branch flow channels, the extension direction of the second common flow channel is parallel to the axial direction of the mounting cavity, the extension direction of each second branch flow channel intersects with the extension direction of the second common flow channel, and each second branch flow channel has the liquid outlet.

[0016] Optionally, the extension direction of the first common flow channel is parallel to the extension direction of the second common flow channel; the extension direction of each first branch flow channel is perpendicular to the extension direction of the first common flow channel; and the extension direction of each second branch flow channel is perpendicular to the extension direction of the second common flow channel.

[0017] Optionally, a bearing plate is fixed to the outer side surface of the motor housing, and the first common flow channel and the second common flow channel are both located on the bearing plate.

[0018] Optionally, the permanent magnet linear motor further includes: a first switch component distributed at the inlet of the first common flow channel and detachably connected to the supporting plate, and a second switch component distributed at the outlet of the second common flow channel and detachably connected to the supporting plate.

[0019] Optionally, each of the annular stator cores has a plurality of inlay slots arrayed along the axial direction of the mounting cavity; the stator assembly further comprises: a plurality of groups of stator windings corresponding one-to-one to the plurality of annular stator cores, each group of stator windings comprising a plurality of annular stator windings;

[0020] The multiple annular stator windings in each group of stator windings are embedded in a one-to-one correspondence with the multiple embedding slots in the corresponding annular stator core.

[0021] Optionally, the mover assembly includes: a secondary shaft, multiple annular permanent magnets and multiple annular magnetic rings, the multiple permanent magnets and multiple magnetic rings are all sleeved and fixed on the outer side surface of the secondary shaft, and one permanent magnet is distributed between every two adjacent magnetic rings.

[0022] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0023] A permanent magnet linear motor may include: a motor housing, a stator assembly, a mover assembly, and a plurality of annular seals. The stator assembly in the motor is arranged as a plurality of annular stator cores arranged in an axial array along the motor housing, and an annular seal is provided between the side surfaces of each two adjacent annular stator cores near the edge area of ​​the mover assembly. In this way, a coolant flow cavity can be formed between the side surfaces of each two adjacent annular stator cores, the outer side surfaces of the annular seals, and the inner side walls of the mounting cavity. The coolant flow cavity can be connected to the liquid inlet of the first coolant flow channel and the liquid outlet of the second coolant flow channel provided in the motor housing, respectively. That is, the coolant flow cavity can be formed by the side surfaces of the annular stator cores, the annular seals, and the motor housing, without the need to provide other components in the motor to assist in forming the coolant flow cavity, thereby reducing the manufacturing cost of the motor and facilitating the miniaturization design of the motor. In addition, the coolant entering the coolant flow cavity through the liquid inlet of the first coolant flow channel can effectively cool the stator assembly, improve the power density of the permanent magnet linear motor, and ensure the service life of the permanent magnet linear motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 This is a structural diagram of a permanent magnet linear motor provided in an embodiment of the present application;

[0026] Figure 2 yes Figure 1 A cross-sectional view of a permanent magnet linear motor from one perspective is shown;

[0027] Figure 3 yes Figure 1 A cross-sectional view of the permanent magnet linear motor from another perspective is shown;

[0028] Figure 4 is a cross-sectional view of another permanent magnet linear motor provided in an embodiment of the present application;

[0029] Figure 5is a cross-sectional view of another permanent magnet linear motor provided in an embodiment of the present application;

[0030] Figure 6 is a cross-sectional view of another permanent magnet linear motor provided in an embodiment of the present application;

[0031] Figure 7 This is a schematic diagram of the distribution of a coolant in a coolant flow chamber provided in an embodiment of the present application;

[0032] Figure 8 This is a schematic diagram of the distribution of a coolant flow channel provided in an embodiment of the present application;

[0033] Figure 9 This is a schematic structural diagram of another permanent magnet linear motor provided in an embodiment of the present application.

[0034] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] It should be understood that references throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present invention. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0038] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 is a structural diagram of a permanent magnet linear motor provided in an embodiment of the present application, Figure 2 yes Figure 1 A cross-sectional view showing a perspective of a permanent magnet linear motor, Figure 3 yes Figure 1 Another perspective view of the cross section of the permanent magnet linear motor. The permanent magnet linear motor can include a motor housing 100, a stator assembly 200, a mover assembly 300, and a plurality of ring-shaped sealing members 400.

[0039] The motor housing 100 in the permanent magnet linear motor can have a mounting cavity 101, and a first cooling liquid flow channel 102 and a second cooling liquid flow channel 103 in communication with the mounting cavity 101. The first cooling liquid flow channel 102 can have a plurality of liquid inlet openings a1, and the second cooling liquid flow channel 103 can have a plurality of liquid outlet openings b1. For example, the number of the plurality of liquid inlet openings a1 can be equal to the number of the plurality of liquid outlet openings b1.

[0040] The stator assembly 200 in the permanent magnet linear motor can be fixed in the mounting cavity 101 of the motor housing 100, and can be sleeved on the mover assembly 300 with an air gap between the stator assembly 200 and the mover assembly 300. The stator assembly 200 can include a plurality of ring-shaped stator cores 201 arranged in an axial direction of the mounting cavity 101 of the motor housing 100. The edge region between the side surfaces of every two adjacent ring-shaped stator cores 201 close to the mover assembly 300 can be fixed with a ring-shaped sealing member 400, and the ring-shaped sealing member 400 can be arranged coaxially with the ring-shaped stator core 201. Here, one ring-shaped sealing member 400 can be fixed between the two side surfaces of the two adjacent ring-shaped stator cores 201 arranged oppositely.

[0041] Here, the side surfaces of every two adjacent ring-shaped stator cores 201, the circumferentially distributed outer side surfaces of the ring-shaped sealing member 400, and the inner side wall of the motor housing 100 can form a cooling liquid flow cavity A, and the cooling liquid flow cavity A can be in communication with one liquid inlet opening a1 and one liquid outlet opening b1, respectively. It should be noted that one cooling liquid flow cavity A can be arranged between every two adjacent ring-shaped stator cores 201 of the plurality of ring-shaped stator cores 201, and the cooling liquid flow cavity A can correspond to a group of liquid inlet openings a1 and liquid outlet openings b1. Here, the cooling liquid flow cavity A can also be ring-shaped.

[0042] For example, the stator assembly 200 in the motor is provided with a plurality of annular stator cores 201 arranged in an axial array along the motor housing 100, and an annular seal 400 is provided between the side surfaces of each two adjacent annular stator cores 201 near the edge area of ​​the rotor assembly 300. In this way, a coolant flow cavity A can be formed between the side surfaces of each two adjacent annular stator cores 201, the outer side surfaces of the annular seal 400, and the inner sidewall of the mounting cavity 101. The coolant flow cavity A can be connected to the liquid inlet a1 of the first coolant flow channel 102 and the liquid outlet b1 of the second coolant flow channel 103 provided in the motor housing 100, respectively. That is, the coolant flow cavity A can be formed by the side surfaces of the annular stator core 201, the annular seal 400, and the motor housing 100, without the need to provide other components in the motor to assist in forming the coolant flow cavity A, thereby reducing the manufacturing cost of the motor and facilitating the miniaturization design of the motor. In addition, the coolant entering the coolant flow cavity A through the liquid inlet a1 of the first coolant flow channel 102 can effectively cool the stator assembly 200, thereby improving the power density of the permanent magnet linear motor and ensuring the service life of the permanent magnet linear motor.

[0043] In summary, an embodiment of the present application provides a permanent magnet linear motor, which may include: a motor housing, a stator assembly, a mover assembly, and a plurality of annular seals. The stator assembly in the motor is arranged as a plurality of annular stator cores arranged in an axial array along the motor housing, and an annular seal is provided between the side surfaces of each two adjacent annular stator cores near the edge area of ​​the mover assembly. In this way, a coolant flow cavity can be formed between the side surfaces of each two adjacent annular stator cores, the outer side surfaces of the annular seals, and the inner side walls of the mounting cavity. The coolant flow cavity can be connected to the liquid inlet of the first coolant flow channel and the liquid outlet of the second coolant flow channel provided in the motor housing, respectively. That is, the coolant flow cavity can be formed by the side surfaces of the annular stator cores, the annular seals, and the motor housing, without the need to provide other components in the motor to assist in forming the coolant flow cavity, thereby reducing the manufacturing cost of the motor and facilitating the miniaturization design of the motor. In addition, the coolant entering the coolant flow cavity through the liquid inlet of the first coolant flow channel can effectively cool the stator assembly, improve the power density of the permanent magnet linear motor, and ensure the service life of the permanent magnet linear motor.

[0044] Optional, please refer to Figure 4 , Figure 4: is a cross-sectional view of another permanent magnet linear motor provided in an embodiment of the present application. Each annular stator core 201 may have a plurality of inlay slots B arranged in an axial array along the mounting cavity 101 in the motor housing 100. The stator assembly 200 may further include: a plurality of groups of stator windings 202 corresponding one-to-one to the plurality of annular stator cores 201, and each group of stator windings 202 may include a plurality of annular stator windings 202. The plurality of annular stator windings in each group of stator windings 202 may be embedded one-to-one with the plurality of inlay slots B in the corresponding annular stator core 201.

[0045] In the embodiments of this application, Figure 4 As shown, the rotor assembly 300 in the permanent magnet linear motor may include: a secondary shaft 301, multiple annular permanent magnets 302, and multiple annular magnetic conductive rings 303. The multiple annular permanent magnets 302 and the multiple annular magnetic conductive rings 303 are all sleeved and fixed on the outer side of the secondary shaft 301, and a permanent magnet 302 may be distributed between every two adjacent magnetic conductive rings 303. For example, the outer surface of the magnetic conductive ring 303 adopts a petal-shaped modification to optimize the sinusoidality of the air gap magnetic flux, reduce harmonic components, and optimize motor performance.

[0046] Optional, please refer to Figure 5 、 Figure 6 and Figure 7 , Figure 5 is a cross-sectional view of another permanent magnet linear motor provided in an embodiment of the present application, Figure 6 is a cross-sectional view of another permanent magnet linear motor provided in an embodiment of the present application. Figure 7 This is a schematic diagram of the distribution of a coolant in a coolant flow cavity provided in an embodiment of the present application. A diverter plate 201a distributed in the coolant flow cavity A is fixed on the side of one of the annular stator cores 201 in every two adjacent annular stator cores 201 among the multiple annular stator cores 201. The diverter plate 201a can be used to separate the coolant flow cavity A into an inlet flow cavity A1 connected to the liquid inlet a1, and an outlet flow cavity A2 connected to the liquid outlet b1. In this way, by providing a diverter plate 201a on the side of one of the annular stator cores 201 in every two adjacent annular stator cores 201, the diverter plate 201a can be used to separate the coolant flow cavity A into an inlet flow cavity A1 and an outlet flow cavity A2. In this manner, coolant Y enters the inlet flow chamber A1 through the inlet a1 of the first coolant flow channel 102 to cool the stator assembly 200, and then flows out through the outlet flow chamber A2 and the outlet b1 of the second coolant flow channel 103. It should be noted that the inlet flow chamber A1 and the outlet flow chamber A2 are interconnected, allowing the coolant in the inlet flow chamber A1 to flow into the outlet flow chamber A2.

[0047] In the embodiments of this application, Figure 5 and Figure 6 As shown, an annular guide plate 201b distributed in the coolant flow chamber A can also be fixed on the side surface of one of the annular stator cores 201 in every two adjacent annular stator cores 201. Part of the guide plate 201b can be located in the liquid inlet flow chamber A1, and another part of the guide plate 201b can be located in the liquid outlet flow chamber A2. In this case, an annular guide plate 201b is provided on the side surface of one of the annular stator cores 201 in every two adjacent annular stator cores 201. In this way, the coolant Y entering the coolant flow chamber A can be diverted by the guide plate 201b, ensuring that the area within the coolant flow chamber A can flow into the coolant Y, further ensuring a better cooling effect on the stator assembly 200.

[0048] For example, the annular guide plate 201 b may form a first guide groove with the annular seal 400 , and the annular guide plate 201 b may form a second guide groove with the inner side wall of the mounting cavity 101 in the motor housing 100 .

[0049] Optional, please refer to Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the distribution of a coolant flow channel provided in an embodiment of the present application. Figure 9 : This is a structural schematic diagram of another permanent magnet linear motor provided in an embodiment of the present application. The first coolant flow channel 102 provided in the motor housing 100 may include: a first common flow channel 102a and a plurality of first branch flow channels 102b, and the extension direction of the first common flow channel 102a may be parallel to the axial direction of the installation cavity 101 of the motor housing 100. The extension direction of each first branch flow channel 102b may intersect with the extension direction of the first common flow channel 102a, and each first branch flow channel 102b may have a liquid inlet a1. The second coolant flow channel 103 provided in the motor housing 100 may include: a second common flow channel 103a and a plurality of second branch flow channels 103b, and the extension direction of the second common flow channel 103a may be parallel to the axial direction of the installation cavity 101 in the motor housing 100, and the extension direction of each second branch flow channel 103b may intersect with the extension direction of the second common flow channel 103a, and each second branch flow channel 103b may have a liquid outlet b1. It should be noted that every two adjacent annular stator cores 201 correspond to one first shunt flow channel 102 b , and every two adjacent annular stator cores 201 correspond to one second shunt flow channel 103 b .

[0050] It should also be noted that, in other possible implementations, the first coolant flow channel 102 may be composed of multiple first branch channels (not shown in the figure), each of which may be in communication with the coolant flow cavity A between two adjacent annular stator cores. The second coolant flow channel 103 may be composed of multiple second branch channels (not shown in the figure), each of which may be in communication with the coolant flow cavity A between two adjacent annular stator cores.

[0051] For example, the coolant can flow into the first common flow channel 102a, and then flow into the coolant flow cavity A between each two adjacent annular stator cores 201 in the multiple annular stator cores 201 through the liquid inlets a1 of the multiple first branch flow channels 102b; then, the coolant enters the second common flow channel 103a through the liquid outlets b1 of the multiple second branch flow channels 103b.

[0052] In this application, if Figure 8 As shown, the extension direction of the first common flow channel 102a in the first coolant flow channel 102 can be parallel to the extension direction of the second common flow channel 103a in the second coolant flow channel 103. The extension direction of each first branch flow channel 102b can be perpendicular to the extension direction of the first common flow channel 102a, and the extension direction of each second branch flow channel 103b can be perpendicular to the extension direction of the second common flow channel 103a.

[0053] In the embodiments of this application, Figure 8 and Figure 9 As shown, a bearing plate 104 can be fixed to the outer side of the motor housing 100, and the first common flow channel 102a and the second common flow channel 103a can both be located on the bearing plate 104. In this way, by providing the bearing plate 104 on the outer side of the motor housing 100 and opening the first common flow channel 102a and the second common flow channel 103a by providing the bearing plate 104 on the outer side of the motor housing 100, the structural strength of the motor housing 100 can be effectively ensured.

[0054] Optional, such as Figure 8 and Figure 9As shown, the permanent magnet linear motor may further include: a first switch member 500 distributed at the inlet of the first common flow channel 102a and detachably connected to the carrier plate 104, and a second switch member 600 distributed at the outlet of the second common flow channel 103a and detachably connected to the carrier plate 104. In this way, by arranging the first switch member 500 at the inlet of the first common flow channel 102a and the second switch member 600 at the outlet of the second common flow channel 103a, when there is no need to inject coolant into the permanent magnet linear motor, the inlet of the first common flow channel 102a can be closed by the first switch member 500, and the outlet of the second common flow channel 103a can be closed by the second switch member 600, so as to prevent particles such as dust and impurities from entering the interior of the motor. It should be noted that the inlet of the first common flow channel 102a is the opening for injecting coolant into the first common flow channel 102a, and the outlet of the second common flow channel 103a is the opening for the coolant to flow out of the second common flow channel 103a.

[0055] In summary, an embodiment of the present application provides a permanent magnet linear motor, which may include: a motor housing, a stator assembly, a mover assembly, and a plurality of annular seals. The stator assembly in the motor is arranged as a plurality of annular stator cores arranged in an axial array along the motor housing, and an annular seal is provided between the side surfaces of each two adjacent annular stator cores near the edge area of ​​the mover assembly. In this way, a coolant flow cavity can be formed between the side surfaces of each two adjacent annular stator cores, the outer side surfaces of the annular seals, and the inner side walls of the mounting cavity. The coolant flow cavity can be connected to the liquid inlet of the first coolant flow channel and the liquid outlet of the second coolant flow channel provided in the motor housing, respectively. That is, the coolant flow cavity can be formed by the side surfaces of the annular stator cores, the annular seals, and the motor housing, without the need to provide other components in the motor to assist in forming the coolant flow cavity, thereby reducing the manufacturing cost of the motor and facilitating the miniaturization design of the motor. In addition, the coolant entering the coolant flow cavity through the liquid inlet of the first coolant flow channel can effectively cool the stator assembly, improve the power density of the permanent magnet linear motor, and ensure the service life of the permanent magnet linear motor.

[0056] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless expressly limited otherwise.

[0057] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A permanent magnet linear motor, characterized in that: include: Motor housing, stator assembly, mover assembly and multiple annular seals; The motor housing has a mounting cavity, and a first coolant flow channel and a second coolant flow channel both communicating with the mounting cavity, the first coolant flow channel having a plurality of liquid inlets, and the second coolant flow channel having a plurality of liquid outlets; The stator assembly is fixed in the mounting cavity and is mounted on the movable assembly. The stator assembly includes: a plurality of annular stator cores distributed in an axial array along the mounting cavity, an annular seal is fixed between the side surfaces of each two adjacent annular stator cores near the edge area of ​​the movable assembly, and the annular seal is coaxially arranged with the annular stator cores; Wherein, a coolant flow cavity is formed between the side surfaces of every two adjacent annular stator cores, the outer side surface of the annular seal and the inner side wall of the installation cavity, and the coolant flow cavity is respectively connected to one of the liquid inlets and one of the liquid outlets.

2. The permanent magnet linear motor according to claim 1, characterized in that: A diverter plate distributed in the coolant flow cavity is fixed on the side surface of one of the annular stator cores of every two adjacent annular stator cores; The diverter plate is used to separate the cooling liquid flow cavity into an inlet flow cavity communicating with the liquid inlet and an outlet flow cavity communicating with the liquid outlet.

3. The permanent magnet linear motor according to claim 2, characterized in that: An annular guide plate distributed in the coolant flow cavity is fixed to the side surface of one of the annular stator cores in every two adjacent annular stator cores; Part of the guide plate is located in the liquid inlet flow cavity, and another part of the guide plate is located in the liquid outlet flow cavity.

4. The permanent magnet linear motor according to any one of claims 1 to 3, characterized in that: The first cooling liquid flow channel includes: a first common flow channel and a plurality of first branch flow channels, the extension direction of the first common flow channel is parallel to the axial direction of the installation cavity, the extension direction of each first branch flow channel intersects with the extension direction of the first common flow channel, and each first branch flow channel has the liquid inlet; The second cooling liquid flow channel includes: a second common flow channel and multiple second branch flow channels, the extension direction of the second common flow channel is parallel to the axial direction of the mounting cavity, the extension direction of each second branch flow channel intersects with the extension direction of the second common flow channel, and each second branch flow channel has the liquid outlet.

5. The permanent magnet linear motor according to claim 4, characterized in that: The extension direction of the first common flow channel is parallel to the extension direction of the second common flow channel; the extension direction of each first branch flow channel is perpendicular to the extension direction of the first common flow channel; the extension direction of each second branch flow channel is perpendicular to the extension direction of the second common flow channel.

6. The permanent magnet linear motor according to claim 4, characterized in that: A bearing plate is fixed to the outer side surface of the motor housing, and the first common flow channel and the second common flow channel are both located on the bearing plate.

7. The permanent magnet linear motor according to claim 6, characterized in that: The permanent magnet linear motor further includes: a first switch component distributed at the inlet of the first common flow channel and detachably connected to the supporting plate, and a second switch component distributed at the outlet of the second common flow channel and detachably connected to the supporting plate.

8. The permanent magnet linear motor according to any one of claims 1-3 and 5-7, characterized in that: Each of the annular stator cores has a plurality of inlay slots arrayed along the axial direction of the mounting cavity; the stator assembly further comprises: a plurality of groups of stator windings corresponding one-to-one to the plurality of annular stator cores, each group of stator windings comprising a plurality of annular stator windings; The multiple annular stator windings in each group of stator windings are embedded in a one-to-one correspondence with the multiple embedding slots in the corresponding annular stator core.

9. The permanent magnet linear motor according to any one of claims 1-3, 5-7, characterized in that: The mover assembly includes: a secondary shaft, multiple annular permanent magnets and multiple annular magnetic conductive rings. The multiple permanent magnets and multiple magnetic conductive rings are all sleeved and fixed on the outer side surface of the secondary shaft, and one permanent magnet is distributed between every two adjacent magnetic conductive rings.

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