Axial field motor and method for suppressing eddy current losses

Abstract

The application provides an axial magnetic field motor and a method for suppressing eddy current loss, wherein the axial magnetic field motor comprises a stator and two rotors, the stator comprises a stator casing, the stator casing comprises at least one metal plate, a plurality of circumferentially spaced iron core mounting holes are arranged on the metal plate, a plurality of stator flow interruption slots are formed in the metal plate, the stator flow interruption slots are communicated with the iron core mounting holes and the edges of the metal plate in the radial direction, a closed ring is connected to the edges of the metal plate communicated with the stator flow interruption slots, a plurality of iron cores are mounted in the iron core mounting holes, coils are sleeved on the two ends of the iron cores exposed on the two sides of the metal plate, a plurality of coils are sleeved on the iron cores, the two rotors are arranged on the two sides of the metal plate in the axial direction, and the two ends of the iron cores exposed on the two sides of the metal plate are kept apart from the rotor air gaps, so that the purpose of suppressing the eddy current loss is achieved without changing the application of the metal material.

Description

Technical Field

[0001] This invention relates to the field of axial magnetic field motors, and more particularly to an axial magnetic field motor and a method for suppressing eddy current losses. Background Technology

[0002] Axial magnetic field motors, also known as disc motors, have advantages such as small size, high torque density, high power density, and high efficiency, and are widely used in electric vehicles, general industrial applications, and other fields. The motor consists of a housing, stator, and rotor, with the stator and rotor arranged inside the housing. The iron core, magnets, and other metal components in the motor will generate eddy currents when placed in a changing axial magnetic field. These eddy currents can produce both thermal and mechanical effects, adversely affecting the motor. For example, eddy current losses reduce the motor's operating efficiency and can even cause high-temperature demagnetization of permanent magnets.

[0003] Most existing measures to suppress eddy current losses involve changing the material, specifically replacing the metal components with non-metallic materials. For example, patent application number CN2022103256832, entitled "Disc Motor," limits the fixing frame of the stator that secures the iron core to a non-metallic frame to avoid excessive eddy current losses in the motor. However, this method is only feasible in specific environments where metal materials are used, and non-metallic materials do not meet the same mechanical performance requirements as metal materials. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a method for suppressing eddy current losses and an axial magnetic field motor without altering the application of the metal material.

[0005] According to one objective of the present invention, an axial magnetic field motor is provided, comprising a stator and two rotors, wherein the stator comprises:

[0006] A stator housing includes at least one metal plate, the metal plate having a plurality of circumferentially spaced iron core mounting holes, and the metal plate having a plurality of stator flow interruption slots, the stator flow interruption slots being radially connected to the iron core mounting holes and the edge of the metal plate;

[0007] A closed loop, the closed loop connecting the metal plate to the edge of the stator interruption slot;

[0008] Several iron cores are installed in the iron core mounting holes, and the coils are sleeved on both ends of the iron cores exposed on both sides of the metal plate.

[0009] Several coils are provided, the coils are sleeved on the iron core, and the iron core is sleeved on both ends exposed on both sides of the metal plate;

[0010] The two rotors are disposed on both sides of the metal plate, and the two ends of the iron core exposed on both sides of the metal plate are respectively maintained with the air gap of the rotor.

[0011] In a preferred embodiment, the stator interruption slot is connected to the outer edge of the metal plate;

[0012] Alternatively, the stator interruption slot is connected to the inner edge of the metal plate, the closing ring connects the inner edge of the metal plate and the bearing, the closing ring is made of metal, and an insulating element is provided between the inner edge of the metal plate and the closing ring.

[0013] In a preferred embodiment, the stator housing further includes an intermediate partition plate, and there are two metal plates. The intermediate partition plate is spliced ​​between the two metal plates, and the core mounting hole and the stator interruption slot penetrate the intermediate partition plate and the two metal plates.

[0014] In a preferred embodiment, a coil receiving cavity is provided on the side of the metal plate opposite to the intermediate partition, and the coil is held within the coil receiving cavity. In another preferred embodiment, a plurality of insulating layers are further included, with at least one insulating layer covering the outer periphery of the iron core, and the coil and the metal plate disposed outside the insulating layer.

[0015] In a preferred embodiment, the axial magnetic field motor further includes a rotating shaft and at least one bearing. The rotating shaft passes through the center of the metal plate, and the bearing is disposed between the rotating shaft and the metal plate. The rotor is fixed on the rotating shaft.

[0016] In a preferred embodiment, the rotor includes a rotor disk and a plurality of magnets, the plurality of magnets being arranged circumferentially on the rotor disk, and the magnets being air-gap maintained with the iron core.

[0017] In a preferred embodiment, the rotor disk is provided with a plurality of rotor flow interruption slots, each of the rotor flow interruption slots being arranged circumferentially;

[0018] And / or, the magnet is formed by stacking a number of silicon steel sheets radially, with a flow-breaking surface formed between two adjacent silicon steel sheets.

[0019] According to another objective of the present invention, the present invention also provides a method for suppressing eddy current losses in an axial magnetic field motor, the axial magnetic field motor comprising at least a stator and at least one rotor, the method comprising the following steps:

[0020] A stator flow interruption slot is formed in a radially arranged manner on the metal plate of the stator;

[0021] Rotor flow interruption slots arranged circumferentially are opened on the rotor disk of the rotor.

[0022] In a preferred embodiment, the magnet of the rotor comprises a plurality of silicon steel sheets, and the method further includes:

[0023] A plurality of the silicon steel sheets are arranged radially to form a flow-breaking surface between two adjacent silicon steel sheets.

[0024] In a preferred embodiment, the metal plate is provided with a plurality of circumferentially spaced iron core mounting holes, and the stator interruption slot connects the iron core mounting holes and the edge of the metal plate. The method further includes:

[0025] A closed loop is provided and connected to the edge of the metal plate that connects to the stator interruption slot.

[0026] Compared with existing technologies, this technical solution has the following advantages:

[0027] By creating the stator flow interruption slot in the metal plate, the eddy current path is blocked, reducing and suppressing eddy current losses, thereby ensuring the reliability of motor operation. Furthermore, a closed ring is added at the edge of the metal plate connecting to the stator flow interruption slot to prevent a decrease in the strength of the metal plate caused by the stator flow interruption slot, thus ensuring the support capacity and strength of the metal plate.

[0028] The closed ring can be connected to the inner edge of the metal plate to support the bearing. In this case, the closed ring is made of metal. By adding an insulating element between the closed ring and the inner edge of the metal plate, the stator interruption slot 1200 is prevented from contacting the metal closed ring and thus destroying the flow isolation function.

[0029] An insulating layer can also be wrapped around the outer ring of the iron core to prevent the iron core from directly contacting the metal plate and to isolate eddy currents.

[0030] By creating a rotor flow interruption slot on the rotor disk to block the rotor disk eddy current path, and by stacking several silicon steel sheets to form a magnet to form a flow interruption surface between two adjacent silicon steel sheets to block the magnet eddy current path, not only is manufacturability achieved, but eddy current loss is also suppressed.

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of the stator of the axial magnetic field motor described in this invention;

[0033] Figure 2 This is a schematic diagram of the structure of the metal plate according to the first embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the metal plate according to the second embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the assembly of the iron core and the insulating layer described in this invention;

[0036] Figure 5 This is a schematic diagram of the axial magnetic field motor described in this invention;

[0037] Figure 6 This is a schematic diagram of the rotor disk described in this invention;

[0038] Figure 7 This is a schematic diagram of the structure of the magnet described in this invention;

[0039] Figure 8 This is a schematic diagram of the eddy current path in the stator described in this invention;

[0040] Figure 9 This is a schematic diagram of the eddy current path in the rotor described in this invention;

[0041] Figure 10 This is an exploded view of the axial magnetic field motor described in this invention.

[0042] In the diagram: 100 stator, 1001 stator eddy current path, 110 metal plate, 1100 iron core mounting hole, 1200 stator flow interruption slot, 120 closed ring, 121 pressure plate, 122 metal bearing seat, 1221 bearing end, 1222 bearing bottom, 130 iron core, 131 iron core slot, 1300 coil receiving cavity, 140 coil, 150 insulating component, 160 insulating layer, 170 slot wedge, 200 rotor, 2001 magnet eddy current path, 2002 rotor disk eddy current path, 2100 rotor flow interruption slot, 210 rotor disk, 2101 magnet receiving slot, 220 magnet, 221 silicon steel sheet, 2200 flow interruption surface, 300 shaft, 400 bearing. Detailed Implementation

[0043] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0044] First Embodiment

[0045] like Figure 1 and Figure 2 As shown, the axial magnetic field motor stator 100 includes:

[0046] A stator housing 110 is provided, the stator housing 110 includes at least one metal plate 111, the metal plate 111 is provided with a plurality of circumferentially spaced iron core mounting holes 1100, the metal plate 111 is provided with a plurality of stator flow interruption slots 1200, the stator flow interruption slots 1200 are radially connected to the iron core mounting holes 1100 and the edge of the metal plate 111;

[0047] A closed ring 120 is connected to the edge of the metal plate 111 that connects to the stator interruption slot 1200.

[0048] A plurality of iron cores 130, wherein one of the iron cores 130 is respectively provided on each of the iron core mounting holes 1100;

[0049] A plurality of coils 140, wherein at least one coil 140 is provided on the outer ring of each of the iron cores 130.

[0050] By creating the stator flow interruption slot 1200 on the metal plate 111, the eddy current path is blocked, thereby reducing and suppressing eddy current losses and ensuring the reliability of motor operation. Furthermore, a sealing ring 120 is added at the edge of the metal plate 111 connecting to the stator flow interruption slot 1200 to prevent a decrease in the strength of the metal plate 111 caused by the stator flow interruption slot 1200, thus ensuring the support capacity and strength of the metal plate 111. Therefore, this embodiment achieves the purpose of suppressing eddy current losses in the stator housing 110 without changing the application of the metal material by creating the stator flow interruption slot 1200 on the metal plate 111 and sealing the edge with the sealing ring 120.

[0051] When a metal is placed in a changing magnetic field or moves in a non-uniform magnetic field, an induced electromotive force (EMF) is generated within the metal. Because the metal's resistance is very small, even a small induced EMF can induce a strong current. This current flows through closed loops within the metal, much like eddies in water; therefore, it is called an eddy current, or simply eddy current. Eddy currents can produce both thermal and mechanical effects. In the existing design, the iron core 130 is directly in contact with and connected to the metal plate 111, resulting in the formation of the stator eddy current path 1001 as shown... Figure 8 The elliptical circuit shown has a stator eddy current path 1001 for each core 130. The stator eddy current path 1001 can be blocked by creating radially arranged stator interruption slots 1200 on the metal plate 111. (Refer to...) Figure 2 and Figure 8 This achieves the effect of reducing eddy current losses.

[0052] In addition, at least one insulating layer 160 may be wrapped around the outer ring of the iron core 130, see reference. Figure 4To prevent the iron core 130 from directly contacting the metal plate 111, thus isolating eddy currents. The insulating layer 160 can be insulating paper, and both the metal plate 111 and the coil 140 are disposed outside the insulating layer 160.

[0053] like Figure 1 and Figure 2 As shown, the metal plate 111 has an annular structure, and the stator interruption slot 1200 can extend and connect to the inner edge of the metal plate 111, that is, the closed ring 120 is connected to the inner edge of the metal plate 111. The core mounting hole 1100 is adapted to the shape of the core 130, both being trapezoidal. (Refer to...) Figure 2 and Figure 4 Furthermore, the upper trapezoidal base of the core mounting hole 1100 is arranged inward, and the lower trapezoidal base of the core mounting hole 1100 is arranged outward, that is, the stator interruption slot 1200 extends and connects to the upper trapezoidal base of the core mounting hole 1100 and the inner edge of the metal plate 111.

[0054] refer to Figure 2 The stator flow interruption slot 1200 extends axially through the metal plate 111, and each core mounting hole 1100 corresponds to one stator flow interruption slot 1200. The stator flow interruption slot 1200 extends radially to block the stator eddy current path 1001 in which it is located. (Refer to...) Figure 8 To further explain, each of the iron cores 130 generates a stator eddy current path 1001, which is composed of multiple elliptical loop paths arranged from the inside to the outside. The stator interruption slot 1200 refers to a slot that is arranged radially and penetrates the metal plate 111 axially. This slot blocks each elliptical loop path, thereby reducing eddy current loss.

[0055] like Figure 1 and Figure 2 As shown, the iron core 130 passes through the iron core mounting hole 1100, and air gap surfaces are formed at both ends of the iron core 130 along the axial direction. At this time, the stator 100 is installed in a single stator double rotor axial magnetic field motor.

[0056] like Figure 10 As shown, cooling water channels can be provided inside the stator housing 110 to cool the iron core 130 and the coil 140. The stator housing 110 can be a modular structure for easier machining and manufacturing.

[0057] For example, the stator housing 110 includes two metal plates 111 and a middle partition 112. The middle partition 112 is spliced ​​between the two metal plates 111 and can be fixed by bolts. Furthermore, the core mounting hole 1100 and the stator interruption slot 1200 penetrate the middle partition 112 and the two metal plates 111. The core mounting holes 1100 penetrate both metal plates 111 and the intermediate plate 112. The outer side of the metal plate 111 facing away from the intermediate plate 112 forms the coil receiving cavity 1300. Water channels 1111 are provided on the inner side of the metal plate 111. The intermediate plate 112 has a central hole 1121 to connect the water channels 1111 of the two metal plates 111. When the intermediate plate 112 is spliced ​​and fixed to the two metal plates 111, the two water channels 1111 and the central hole 1121 connect to form the cooling water channel. This allows the core 130 mounted on the core mounting 1110 and the coil 140 arranged in the coil receiving cavity 1300 to be cooled after the cooling medium (including cooling oil) is introduced into the cooling water channel. This not only facilitates manufacturing but also improves the cooling effect and increases design space. Additionally, each of the two side plates 111 can be provided with a water inlet 1112 for introducing or discharging the cooling medium.

[0058] The intermediate partition 112 and the metal plate 111 can be fixed together with adhesive or screws. The metal plate 111, made of metal, ensures its support capacity, while the intermediate partition 112 can be made of flexible material to seal the two water channels 1111 and ensure that the two water channels 1111 are connected only through the intermediate hole 1121. This ensures that the cooling medium passes evenly through the two water channels 1111, increases the heat exchange area, and improves the cooling performance.

[0059] Specifically, a coil receiving cavity 1300 is provided on the side of the metal plate 111 away from the middle partition plate 112. The iron core mounting hole 1100 connects the coil receiving cavities 1300 of the two metal plates 111. That is, the iron core mounting hole 1100 is a hole so that after the iron core 130 passes through the iron core mounting hole 1100, a coil 140 is respectively sleeved on both ends of the iron core 130, and a coil 140 is kept in each coil receiving cavity 1300. Then, sealant can be injected into the coil receiving cavity 1300 to fix the iron core 130 and the coil 140 on the metal plate 111.

[0060] refer to Figure 10The stator 100 further includes a plurality of slot wedges 170. The slot wedges 170 are respectively fitted onto both axial sides of the iron core 130. The coil 140 is located within the coil receiving cavity 1300 and abuts against the slot wedges 114 and the metal plate 111 to pre-fix the coil 130. Afterwards, potting compound can be injected into the coil receiving cavity 1300 to fix the slot wedges 170, the coil 140, the iron core 130, and the metal plate 111.

[0061] Continue to refer to Figure 10 The iron core 130 is provided with iron core slots 131 on both sides of its circumference, so that each slot wedge 170 is inserted into the iron core slots 131 of two adjacent iron cores 130 along the radial direction, thereby realizing the insertion of the slot wedge 170 into the iron core 130.

[0062] refer to Figure 5 The center of the metal plate 111 is connected to the rotating shaft 300 via the bearing 400, and the closed ring 120 is located at the inner edge of the metal plate 111, that is, the closed ring 120 is connected between the inner edge of the metal plate 111 and the bearing 400. The closed ring 120 is used to support the bearing 400. At this time, the closed ring 120 is made of metal to achieve better support capacity. At this time, an insulating element 150 can be added between the closed ring 120 and the inner edge of the metal plate 111 to prevent the stator interruption slot 1200 from contacting the metal closed ring 120 and thus destroying the interruption effect.

[0063] like Figure 1 As shown, the closed ring 120 includes a pressure plate 121 and a metal bearing seat 122. The pressure plate 121 and the metal bearing seat 122 are engaged and wrapped around the inner edge of the metal plate 111. An insulating element 150 is provided between the pressure plate 121 and the metal bearing seat 122 and the inner edge of the metal plate 111, respectively.

[0064] Specifically, the metal bearing housing 122 includes a bearing end 1221 and a bearing bottom 1222 connected to each other. The bearing end 1221 and the pressure plate 121 are respectively connected to the axial end faces of the inner edge of the metal plate 111. The bearing bottom 1222 is connected to the inner end face of the inner edge of the metal plate 111, and the pressure plate 121 is engaged with the bearing bottom 1222. At this time, the bearing bottom 1222 is located between the inner end face of the inner edge of the metal plate 111 and the bearing 400, that is, the bearing 400 is connected to the inner ring of the bearing bottom 1222. Figure 5 .

[0065] The bearing end 1221 and the pressure plate 121 form the coil receiving cavity 1300. The closing ring 120 is divided into the pressure plate 121 and the metal bearing seat 122, which facilitates the assembly and forming of the closing ring 120 and the arrangement of the insulating element 150. Specifically, the bearing end 1221, the bearing bottom 1222, and the pressure plate 121 are each provided with an insulating element 150 between their respective inner edges and the metal plate 111. Each insulating element 150 can be annular, i.e., it can be a rubber ring. The bearing end 1221 and the bearing bottom 1222 are both made of metal, while the pressure plate 121 does not directly contact the bearing 400. Besides being made of metal, it can also be made of high-strength non-metallic materials, such as carbon fiber or glass fiber. Furthermore, the metal plate 111, the pressure plate 121, and the metal bearing seat 122 can be bonded together with adhesive.

[0066] In summary, by creating the stator flow interruption slot 1200 on the metal plate 111, the eddy current path is blocked, reducing and suppressing eddy current losses, thereby ensuring the reliability of motor operation. Furthermore, a closing ring 120 is added at the edge of the metal plate 111 connecting to the stator flow interruption slot 1200 to prevent a decrease in the strength of the metal plate 111 caused by the stator flow interruption slot 1200, thus ensuring the support capacity and strength of the metal plate 111. The closing ring 120 can be connected to the inner edge of the metal plate 111 to support the bearing 400. In this case, the closing ring 120 is made of metal. By adding an insulating element 150 between the closing ring 120 and the inner edge of the metal plate 111, contact between the stator flow interruption slot 1200 and the metal closing ring 120 is prevented, thus avoiding damage to the flow interruption effect. Furthermore, an insulating layer 160 can be wrapped around the outer ring of the iron core 130 to prevent direct contact between the iron core 130 and the metal plate 111, thereby isolating eddy currents. It can be seen that this embodiment achieves the purpose of suppressing eddy current losses in the stator 100 without changing the application of the metal material by opening the stator interruption slot 1200 on the metal plate 111, sealing the edge with the closing ring 120, and providing an insulating element 150 between the metal plate 111 and the metal closing ring 120, and by providing an insulating layer 160 around the outer ring of the iron core 130.

[0067] Second Embodiment

[0068] like Figure 3 As shown, the stator 100 of the second embodiment differs from that of the first embodiment in that the stator interruption slot 1200 is radially connected to the outer edge of the core mounting hole 1100 and the metal plate 111.

[0069] When the stator interruption slot 1200 extends to the outer edge of the metal plate 111, the closing ring 120 is connected to the outer edge of the metal plate 111. Since the metal plate 111 has no installation requirements, the closing ring 120 can be made of high-strength non-metallic material, and the insulating component 150 can be omitted. The closing ring 120 can be fixed to the outer edge of the metal plate 111 by means of glue, snap-fit, etc.

[0070] Third Embodiment

[0071] like Figure 5 and Figure 10 As shown, the axial magnetic field motor includes an axial magnetic field motor stator 100 of any of the above embodiments. The axial magnetic field motor also includes at least one rotor 200, a rotating shaft 300 and at least one bearing 400. The rotating shaft 300 passes through the center of the metal plate 111. The bearing 400 is disposed between the rotating shaft 300 and the metal plate 111. The rotor 200 is fixed on the rotating shaft 300 and the rotor 200 is air-gap maintained with the stator 100.

[0072] Since the axial magnetic field motor adopts the stator 100 described in the above embodiment, the beneficial effects of the axial magnetic field motor can be referred to the stator 100 described in the above embodiment.

[0073] like Figures 5 to 7 As shown, the rotor 200 includes a rotor disk 210 and a plurality of magnets 220. The magnets 220 are arranged circumferentially on the rotor disk 210, and are air-gap connected to the iron core 130. When the magnets 220 are arranged on the rotor disk 210, they slightly protrude from the surface of the rotor disk 210 to engage with the iron core 130 in an air-gap manner.

[0074] refer to Figure 9 The rotor 200 generates a circular rotor disk eddy current path 2002 and an elliptical magnet eddy current path 2001. The rotor disk eddy current path 2002 is blocked by opening a rotor flow-blocking slot 2100 on the rotor disk 210, and the magnet eddy current path 2001 is blocked by forming a flow-blocking surface 2200 on the magnet 220. (See reference...) Figure 6 and Figure 7 To further explain, each of the magnets 220 corresponds to the generation of the magnet eddy current path 2001, which consists of multiple elliptical loop paths arranged from the inside out. The flow-blocking surface 2200 refers to a circumferentially tangent gap, which blocks each elliptical loop path, thereby reducing eddy current losses. Similarly, the rotor flow-blocking gap 2100 refers to multiple annular gaps arranged from the inside out, which can block the circular rotor disk eddy current path 2002.

[0075] Specifically, the rotor disk 210 has several rotor flow interruption slots 2100 to block the eddy current path and reduce eddy current losses. The rotor disk eddy current path 2002 is... Figure 9 The circular path shown generates a vortex path on the rotor disk 210, and the circumferentially arranged rotor flow interruption slot 2100 can block the rotor disk vortex path 2002.

[0076] Reference 5 and Figure 6 A magnet receiving groove 2101 is formed on the end face of the rotor disk 210 facing the iron core 130. The magnet 220 is positioned in the magnet receiving groove 2101 and is air-gap maintained with the iron core 130. The rotor flow interruption slot 2100 can be set at the bottom of the magnet receiving groove 2101, and multiple rotor flow interruption slots 2100 are arranged radially from the inside to the outside. In addition, the depth of the rotor flow interruption slot 2100 is less than the thickness of the rotor disk 210, for example, the depth of the rotor flow interruption slot 2100 is 1 / 5 of the thickness of the rotor disk 210, and the radial width of the rotor flow interruption slot 2100 is 1 mm, but not limited to this. Insulating glue can also be injected into the rotor flow interruption slot 2100 to suppress eddy current losses while ensuring structural strength.

[0077] refer to Figure 10 The rotor 200 also includes several pressure plates 230. A pressure plate 230 is provided between two adjacent magnets 220. The pressure plate 230 is fixed to the magnet receiving groove 2101 by fasteners and adapts to the circumferential side of the magnet 220 by means of inclined surface to perform axial and circumferential positioning of the magnet 220.

[0078] More specifically, see reference Figure 7 The magnet 220 is formed by stacking a number of silicon steel sheets 221 radially. A flow-blocking surface 2200 is formed between two adjacent silicon steel sheets 221. The flow-blocking surface 2200 can block the eddy current path 2001 of the magnet, thereby suppressing eddy current loss.

[0079] The magnets 220 are trapezoidal in shape, and their number is consistent with the number of iron cores 130. The upper base of the trapezoid of the magnets 220 faces inward, and the lower base of the trapezoid of the magnets 220 faces outward. That is, the width of the plurality of silicon steel sheets 221 that make up the magnets 220 increases radially from the inside to the outside.

[0080] like Figure 5As shown, there is one stator 100 and two rotors 200. The two rotors 200 are air-gap positioned on opposite sides of the stator 100 to form a single-stator, dual-rotor axial magnetic field motor. Of course, depending on the number of rotors, a single-stator, single-rotor, or dual-stator, single-rotor axial magnetic field motor can be obtained.

[0081] In summary, by opening the rotor flow interruption slot 2100 on the rotor disk 210 to block the rotor disk eddy current path 2002, and by stacking several silicon steel sheets 221 to form a magnet 220 to form a flow interruption surface 2200 between two adjacent silicon steel sheets 221 to block the magnet eddy current path 2001, not only is manufacturability achieved, but eddy current loss is also effectively suppressed.

[0082] Fourth embodiment

[0083] like Figures 1 to 6 As shown, the eddy current loss suppression method of the axial magnetic field motor includes at least a stator 100 and at least one rotor 200. The method includes the following steps:

[0084] A stator flow interruption slot 1200 arranged radially is formed on the metal plate 111 of the stator 100;

[0085] Rotor flow interruption slots 2100 arranged circumferentially are formed on the rotor disk 210 of the rotor 200.

[0086] The stator flow interruption slot 1200 penetrates the metal plate 111 axially, and the depth of the rotor flow interruption slot 2100 is less than the thickness of the rotor disk 210. The stator flow interruption slot 1200 can block the stator eddy current path 1001, see reference. Figure 8 The rotor flow interruption slot 2100 can block the rotor disk eddy current path 2002, as shown in the reference. Figure 9 This effectively suppresses motor eddy current losses, and the stator cutoff slot 1200 and the rotor cutoff slot 2100 can be machined using cutting tools, achieving manufacturability.

[0087] refer to Figure 7 The magnet 220 of the rotor 200 includes a plurality of silicon steel sheets 221, and the method further includes:

[0088] A plurality of silicon steel sheets 221 are arranged radially to form a flow-blocking surface 2200 between adjacent silicon steel sheets 221. This flow-blocking surface 2200 is designed to block the eddy current path 2001 of the magnet. (Refer to...) Figure 9 This ensures the integrity of the silicon steel sheet 221 while also achieving manufacturability.

[0089] refer to Figure 1 and Figure 2 The metal plate 111 is provided with a plurality of circumferentially spaced iron core mounting holes 1100, and the stator interruption slot 1200 connects the iron core mounting holes 1100 and the edge of the metal plate 111. The method further includes:

[0090] A closed ring 120 is provided, and the closed ring 120 is connected to the edge of the metal plate 111 that connects to the stator interruption slot 1200.

[0091] The stator interruption slot 1200 can extend and connect to the inner and outer edges of the metal plate 111, while the closing ring 120 is correspondingly installed on the inner and outer edges of the metal plate 111, so as to avoid the stator interruption slot 1200 affecting the strength of the metal plate 111. It can be seen that by using the above structure, the structural strength of the metal plate 111 can be guaranteed while suppressing eddy current loss.

[0092] In summary, by creating the stator interruption slot 1200 on the metal plate 111, the rotor interruption slot 2100 on the rotor disk 210, and the interruption surface 2200 on the magnet 220, not only is the forming process convenient, but the eddy current loss is also effectively suppressed, thereby ensuring the reliability and stability of the motor.

[0093] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of patent application of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. An axial magnetic field motor, characterized in that, It includes a stator (100) and two rotors (200), wherein the stator (100) includes: A stator housing (110) is provided, the stator housing (110) includes at least one metal plate (111), the metal plate (111) is provided with a plurality of circumferentially spaced iron core mounting holes (1100), the metal plate (111) is provided with a plurality of stator flow interruption slots (1200), the stator flow interruption slots (1200) are radially connected to the iron core mounting holes (1100) and the edge of the metal plate (111); A closed ring (120) is provided, which connects the metal plate (111) to the edge of the stator interruption slot (1200); Several iron cores (130); A plurality of coils (140) are sleeved on the iron core (130), and the coils (140) are sleeved on both ends of the iron core (130) exposed on both sides of the metal plate (111). The iron core (130) is installed in the iron core mounting hole (1100) and the coil (140) is sleeved on both ends of the iron core (130) exposed on both sides of the metal plate (111). The two rotors (200) are disposed on both sides of the metal plate (111), and the iron core (130) is exposed at both ends on both sides of the metal plate (111) and is maintained in the air gap with the rotors (200); The closed ring (120) engages with the edge of the metal plate (111).

2. The axial magnetic field motor as described in claim 1, characterized in that, The stator interruption slot (1200) is connected to the inner edge of the metal plate (111), and the closing ring (120) connects the inner edge of the metal plate (111) and the bearing (400). The closing ring (120) is a metal closing ring, and an insulating element (150) is provided between the inner edge of the metal plate (111) and the closing ring (120).

3. The axial magnetic field motor as described in claim 1, characterized in that, The stator housing (110) also includes an intermediate partition plate (112), and there are two metal plates (111). The intermediate partition plate (112) is spliced ​​between the two metal plates (111), and the core mounting hole (1100) and the stator interruption slot (1200) penetrate the intermediate partition plate (112) and the two metal plates (111).

4. The axial magnetic field motor as described in claim 3, characterized in that, The metal plate (111) is provided with a coil receiving cavity (1300) on the side opposite to the intermediate partition plate (112), and the coil (140) is held in the coil receiving cavity (1300).

5. The axial magnetic field motor as described in claim 1, characterized in that, It also includes several insulating layers (160), with at least one insulating layer (160) wrapped around the outer periphery of the iron core (130), and the coil (140) and the metal plate (111) disposed outside the insulating layer (160).

6. An axial magnetic field motor as described in any one of claims 1 to 5, characterized in that, The axial magnetic field motor further includes a rotating shaft (300) and at least one bearing (400). The rotating shaft (300) passes through the center of the metal plate (111), and the bearing (400) is provided between the rotating shaft (300) and the metal plate (111). The rotor (200) is fixed on the rotating shaft (300).

7. The axial magnetic field motor as described in claim 6, characterized in that, The rotor (200) includes a rotor disk (210) and a plurality of magnets (220). The plurality of magnets (220) are arranged circumferentially on the rotor disk (210), and the magnets (220) are air gapped with the iron core (130).

8. The axial magnetic field motor as described in claim 7, characterized in that, The rotor disk (210) has a plurality of rotor flow interruption slots (2100), and each rotor flow interruption slot (2100) is arranged in the circumferential direction; And / or, the magnet (220) is formed by stacking a plurality of silicon steel sheets (221) radially, with a flow-breaking surface (2200) formed between two adjacent silicon steel sheets (221).

9. A method for suppressing eddy current losses in an axial magnetic field motor, characterized in that, The axial magnetic field motor includes at least a stator (100) and at least one rotor (200), and the method includes the following steps: Stator flow interruption slots (1200) are formed radially on the metal plate (111) of the stator (100). Rotor flow interruption slots (2100) are formed on the rotor disk (210) of the rotor (200) in a circumferential arrangement. The metal plate (111) is provided with a plurality of circumferentially spaced iron core mounting holes (1100), and the stator interruption slot (1200) connects the iron core mounting holes (1100) and the edge of the metal plate (111). The method further includes: A closed loop (120) is provided and connected to the edge of the metal plate (111) that connects to the stator interruption slot (1200).

10. The method for suppressing eddy current losses in an axial magnetic field motor as described in claim 9, characterized in that, The magnet (220) of the rotor (200) comprises a plurality of silicon steel sheets (221), and the method further includes: A plurality of the silicon steel sheets (221) are arranged radially to form a flow-breaking surface (2200) between two adjacent silicon steel sheets (221).

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