Disc-type motor

Abstract

The invention discloses a disc-type motor, the disc-type motor comprises a shell, a rotor structure, a rotating shaft and a heat conduction member, the rotor structure comprises a disc-shaped support member and a plurality of magnetic steels arranged along the circumference of the support member, and the support member is provided with a central hole in a penetrating manner; a rotating shaft penetrates through the center hole and is rotatably arranged in the shell, a cooling channel is formed in the rotating shaft, and the cooling channel is connected with the center hole to form a first cooling loop; the heat conduction part is arranged in the supporting part and located between the two adjacent magnetic steel, and the heat conduction part extends to the first cooling loop in the radial direction of the supporting part. The rotor structure solves the problems that a supporting piece of a rotor structure in a disc type motor in the prior art is made of a composite material, the heat conductivity is poor, magnetic steel is located in the motor, the heat dissipation space is poor, the magnetic steel has a large demagnetization risk due to the too high temperature, and the operation safety of the motor is affected.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical manufacturing, and in particular to a disc-type motor. Background Art

[0002] The disc motor, also known as the axial flux motor, has a different magnetic flux path from the ordinary radial motor. The air gap is planar and the magnetic field is parallel to the motor axis. This structure allows the rotor to have a larger diameter, so that higher torque output can be obtained under the same force. The rotor yoke is located on the side of the stator. This design allows the rotor to interact with the stator more effectively, thereby improving the performance and efficiency of the motor.

[0003] The special structure of the disc motor makes it perform well in applications that require high torque density, such as electric vehicles and other equipment that require compact and efficient power systems. In addition, the design of the disc motor also allows for more flexible layout and installation to adapt to different application requirements.

[0004] However, in the prior art, the support parts of the rotor structure in the disc motor are made of composite materials with poor thermal conductivity. The magnetic steel is located inside the motor with poor heat dissipation space. Excessive temperature causes a greater risk of demagnetization of the magnetic steel, affecting the safe operation of the motor.

[0005] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0006] The main purpose of the present invention is to provide a disc motor, aiming to solve the problem that the support part of the rotor structure in the prior art disc motor is made of composite material with poor thermal conductivity, the magnetic steel is located inside the motor with poor heat dissipation space, and excessive temperature causes a greater risk of demagnetization of the magnetic steel, thereby affecting the safe operation of the motor.

[0007] To achieve the above object, the present invention provides a disc motor, the disc motor comprising:

[0008] case;

[0009] The rotor structure comprises a disc-shaped support member and a plurality of magnetic steels arranged along the circumference of the support member, wherein the support member is provided with a central hole;

[0010] a rotating shaft, which passes through the central hole and is rotatably disposed on the housing, wherein a cooling channel is formed in the rotating shaft, and the cooling channel is connected to the central hole to form a first cooling circuit; and

[0011] The heat conducting member is disposed in the supporting member and between two adjacent magnetic steels, and the heat conducting member extends to the first cooling circuit along the radial direction of the supporting member.

[0012] Preferably, in the disk-type motor, the inner wall of the center hole, the heat-conducting member and the periphery of the rotating shaft surround the center hole to form a first sealed cavity;

[0013] A first channel and a second channel extending in the axial direction are respectively disposed in the rotating shaft. The first channel and the second channel are spaced apart in the radial direction. The first channel and the second channel are respectively communicated with the first sealing cavity and together form the first cooling circuit.

[0014] Preferably, in the disc motor, the heat conductor has a fixed end and a heat dissipation end respectively located at both ends, the fixed end is installed in the support member, the heat dissipation end extends out of the support member along the radial direction of the support member and extends into the first cooling circuit, and the heat dissipation end is arranged close to the rotating shaft and has a gap with the rotating shaft.

[0015] Preferably, in the disc-type motor, the thickness of the heat-conducting member in the axial direction is D1, and the thickness of the supporting member of the rotor structure is D, where D1≤D / 3.

[0016] Preferably, in the disk motor, the first channel and the second channel respectively have a first hole and a second hole extending outside the rotating shaft, the first channel and the second channel are respectively connected to the first sealed cavity through the first hole and the second hole, and one of the first channel and the second channel is a liquid inlet channel, and the other is a liquid outlet channel;

[0017] The first hole and the second hole form a height difference along the axial direction of the rotating shaft, wherein, when the first channel is a liquid inlet channel and the second channel is a liquid outlet channel, the height of the first hole is lower than the height of the second hole; when the second channel is a liquid inlet channel and the first channel is a liquid outlet channel, the height of the second hole is lower than the height of the first hole.

[0018] Preferably, in the disc motor, the second channel is arranged around the first channel, the first channel is a liquid inlet channel, and the second channel is a liquid outlet channel.

[0019] Preferably, in the disk-type motor, a liquid inlet is formed at the end of the first channel extending out of the housing, a liquid outlet is provided at the end of the second channel extending out of the housing, a first sealing cover is provided outside the liquid outlet, the first sealing cover is provided on the housing, and has a first clearance hole for the wall surface of the first channel to extend out;

[0020] After the wall surface of the first channel extends out of the first clearance hole, the first sealing cover is sealed with the outer surface of the shell, the first sealing cover and the shell are surrounded to form a second sealing cavity, and the second sealing cavity is communicated with the liquid outlet;

[0021] The first channel extends out of the second sealing cavity, and the liquid outlet is exposed to the outside of the shell and the first sealing cover.

[0022] Preferably, in the disk-type motor, a cooling circuit of the rotor structure is connected to a cooling circuit of the stator structure outside the housing.

[0023] Preferably, in the disc motor, an annular boss is provided on the rotating shaft;

[0024] One side of the support is sealingly mounted on the annular boss, and the other side is sealingly fixed by an annular pressure plate;

[0025] The first sealing cavity is formed between the annular pressure plate, the inner wall of the central hole of the support member, the annular boss, and the outer wall of the rotating shaft.

[0026] Preferably, in the disk motor, a first sealing gasket is arranged between one side of the support member and the annular boss, and a second sealing gasket is arranged between the annular pressure plate and the other side of the support member.

[0027] The present invention has at least the following beneficial effects:

[0028] The disc motor provided by the present invention has a rotor structure including a disc-shaped support member and a plurality of magnets arranged along the circumference of the support member, wherein the support member is provided with a center hole; a rotating shaft is arranged through the center hole and is rotatably arranged on the shell, a cooling channel is formed in the rotating shaft, and the cooling channel is connected to the center hole to form a first cooling circuit; a heat conductive member is arranged in the support member and between two adjacent magnets, and the heat conductive member extends radially along the support member to the first cooling circuit, thereby effectively achieving heat dissipation of the magnets, avoiding demagnetization of the magnets due to excessively high temperatures, and improving the safety of the motor operation.

[0029] Furthermore, compared with the traditional radial motor, the rotor of the radial motor is composed of silicon steel sheets, which are stacked in the axial direction and can flow directly through the shaft to set up a loop inside the rotor, while the disc motor is usually formed by stacking composite materials together. The rotor structure is relatively thin. If a through hole is made in the middle, it will affect the overall strength, and the sealing after the coolant enters is also difficult to control, that is, the disc motor cannot adopt the traditional radial motor cooling method. The present invention realizes the cooling of the magnetic steel by setting a heat conductor in the rotor structure, one end of the heat conductor is installed in the support member, and the other end extends to the first cooling path, without setting a cooling channel inside the rotor structure.

[0030] Furthermore, compared with the conventional method of connecting the first cooling circuit of the rotor and the second cooling circuit of the stator structure inside the shell, the sealing requirement is very high. Even if the sealing is good, the occurrence of seal aging or seal damage will cause the coolant to spray directly from the stator structure to the rotor structure and enter the air gap between the stator structure and the rotor structure. On the one hand, the amount of coolant is difficult to control, and on the other hand, too much coolant enters the air gap between the stator structure and the rotor structure, which will cause a relatively large oil stirring loss. The present invention extends the liquid outlet of the cooling channel to the outside, and the first cooling circuit of the rotor and the second cooling circuit of the stator structure can be connected outside the shell instead of inside the shell, avoiding a series of problems caused by the connection inside the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A three-dimensional diagram of an embodiment of a disc motor provided by the present invention;

[0032] Figure 2 for Figure 1 A cross-sectional view of

[0033] Figure 3 for Figure 2 Schematic diagram from another perspective;

[0034] Figure 4 for Figure 3 An enlarged schematic diagram at A;

[0035] Figure 5 for Figure 4 Schematic diagram of the structure of the middle part.

[0036] Reference numerals of the present invention:

[0037] Label name Label name 100 Disc motor 3b2 Liquid outlet 1 case 4 Stator structure 11 Front shell structure 5 Thermal Conductors 12 Back shell structure 51 Fixed end 2 Rotor structure 52 Heat dissipation end 21 Support 61 First oil seal structure 22 magnetic steel 62 Second oil seal structure 23 Center hole 63 First gasket 3 Shaft 64 Second sealing gasket 31 Output 71 First end cap 32 Non-output 72 Second end cap 33 Annular boss 73 Ring pressure plate 3a First Channel 81 First sealed chamber 3a1 First hole 82 Second sealed chamber 3a2 Liquid inlet 9 First sealing cover 3b Second channel 91 First hole 3b1 Second hole 92 Through hole

[0038] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0040] In the embodiments of the present invention, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0042] In the embodiments of the present invention, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0043] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0044] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, it can be understood by those skilled in the art that in the embodiments of the present invention, many technical details are proposed in order to enable the reader to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present invention can also be implemented. The division of the following embodiments is for the convenience of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0045] Usually, the rotor of a radial motor is made of silicon steel sheets, which are stacked along the axial direction. A circuit can be set up inside the rotor directly through the shaft for flow. Disc motors are usually made of composite materials stacked together. The rotor structure is relatively thin. If a through hole is made in the middle, it will affect the overall strength, and the seal will be difficult to control after the coolant enters.

[0046] Furthermore, the radial strength of the disc motor is much smaller than that of the traditional radial motor. Therefore, it is necessary to increase the radial length to increase the output performance of the disc motor, but the reserved space is small and it is difficult to adopt the cooling method of the radial motor.

[0047] To this end, the present invention provides a disc motor, such as Figures 1 to 3 As shown, the disc motor 100 includes a housing 1 , a rotor structure 2 , a rotating shaft 3 , a stator structure 4 and a heat conducting member 5 .

[0048] Among them, Figure 2 and Figure 3As shown, the housing 1 includes a front housing structure 11 and a rear housing structure 12. The front housing structure 11 is arranged at the non-output end 32 of the rotating shaft 3, and the rear housing structure 12 is arranged at the output end 31 of the rotating shaft 3. During installation, the front housing structure 11 and the rear housing structure 12 can be installed separately and then fixed together.

[0049] When the rotating shaft 3 is respectively installed on the front shell structure 11 and the rear shell structure 12, a first end cover 71 is sleeved at the position of the rotating shaft 3 near the non-output end 32, the first end cover 71 is arranged in the front shell structure 11, a first oil seal structure 61 is arranged between the first end cover 71 and the front shell structure 11, and the front shell structure 11 and the rotating shaft 3 are sealed by the first oil seal structure 61. Similarly, a second end cover 72 is sleeved at the position of the rotating shaft 3 near the output end 31, the second end cover 72 is arranged in the rear shell structure 12, a second oil seal structure 62 is arranged between the second end cover 72 and the rear shell structure 12, and the rear shell structure 12 and the rotating shaft 3 are sealed by the second oil seal structure 62, so that axial sealing can be achieved. At this time, the rotating shaft 3 can rotate with the front shell structure 11 and the rear shell structure 12, but the first oil seal structure 61 and the front shell structure 11, and the second oil seal structure 62 and the rear shell structure 12 cannot rotate relative to each other. By providing the first oil seal structure 61 and the second oil seal structure 62, it is possible to ensure that the shaft 3 and the front shell structure 11 and the rear shell structure 12 can rotate relative to each other, prevent leakage of the coolant, and prevent external liquid from entering the motor. The first oil seal structure 61 and the second oil seal structure 62 can be conventional oil seal structures, which will not be described in detail.

[0050] like Figure 5 As shown, the rotor structure 2 includes a support member 21 and a plurality of magnets 22. The support member 21 is arranged in a disc shape. The support member 21 is provided with a center hole 23. The plurality of magnets 22 are arranged on the support member 21 and arranged along the circumference of the support member 21. Specifically, the support member 21 is a rotor skeleton arranged in a disc shape, and the rotor skeleton is formed by pressing a composite material. The arrangement of the magnets 22 on the rotor skeleton can be adopted in the arrangement method of the magnets 22 of the conventional disc motor 100, which will not be described in detail here.

[0051] The rotating shaft 3 has an output end 31 and a non-output end 32. The two ends of the rotating shaft 3 are respectively arranged through the front shell structure 11 and the rear shell structure 12. The non-output end 32 of the rotating shaft 3 is arranged through the front shell structure 11, and the output end 31 of the rotating shaft 3 is arranged through the rear shell structure 12. The rotating shaft 3 is arranged through the center hole 23 and is rotatably arranged on the housing 1. A cooling channel is formed in the rotating shaft 3, and the cooling channel is connected to the center hole 23 to form a first cooling circuit.

[0052] There are many ways to set up the cooling channel. For example, it can include a first channel 3a and a second channel 3b that are respectively extended axially in the rotating shaft 3, and the first channel 3a and the second channel 3b are radially spaced apart. In other feasible implementations, other settings are also possible.

[0053] Wherein, when the cooling channel includes the first channel 3a and the second channel 3b, the first channel 3a and the second channel 3b can be arranged such that the first channel 3a is arranged adjacent to the second channel 3b and the first channel 3a and the second channel 3b are arranged side by side in the radial direction; or the second channel 3b is arranged around the first channel 3a, and the specific arrangement can be selected according to needs. In this embodiment, the first channel 3a is arranged at the central axis position of the rotating shaft 3, and the second channel 3b is an annular channel arranged around the first channel 3a, so that the area of ​​the cooling channel can be increased. In other embodiments, the specific formation of the cooling channel can be determined according to specific needs.

[0054] For the sake of convenience, the following mainly takes the cooling channel including the first channel 3a located at the central axis position of the shaft 3, and the second channel 3b arranged around the first channel 3a as an example for explanation. The first channel 3a and the second channel 3b extend from the position adjacent to the center hole 23 to the non-output end 32 of the shaft 3, respectively. The first channel 3a can be the liquid inlet channel and the second channel 3b can be the liquid outlet channel; or the first channel 3a can be the liquid outlet channel and the second channel 3b can be the liquid inlet channel. The specific arrangement is not limited here. Usually, the volume of the liquid inlet channel is larger than the volume of the liquid outlet channel, so that the coolant can stay in the first cooling circuit for a longer time, be fully cooled, and take away heat.

[0055] For ease of explanation, the following description will take the first channel 3a as the liquid inlet channel and the second channel 3b as the liquid outlet channel as an example, but it does not mean that the present invention is limited to the first channel 3a as the liquid inlet channel and the second channel 3b as the liquid outlet channel.

[0056] After the coolant enters from the first channel 3a, in order to facilitate full contact with the heat dissipation end 52 of the heat conductive member 5, the inner wall of the center hole 23, the heat conductive member 5 and the periphery of the rotating shaft 3 are surrounded to form a first sealed cavity 81 at the center hole 23. The first channel 3a and the second channel 3b respectively have a first hole 3a1 and a second hole 3b1 extending outside the rotating shaft 3. The first hole 3a1 is used to input the coolant into the first sealed cavity 81, and the second hole 3b1 is used to discharge the coolant in the first sealed cavity 81 to form a first cooling circuit; the first sealed cavity 81 is connected to the first hole 3a1 and the second hole 3b1 respectively. At this time, after the coolant enters from the first channel 3a, it flows out from the first hole 3a1 of the first channel 3a and enters the first sealed cavity 81. After heat exchange with the heat conductive member 5 in the first sealed cavity 81, the coolant passes through the second hole 3b1 and flows into the second channel 3b, thereby forming a first cooling circuit.

[0057] Of course, when the first channel 3a is a liquid outlet channel and the second channel 3b is a liquid inlet channel, the flow direction of the coolant is opposite to the above flow direction. At this time, the second hole 3b1 is used to input the coolant into the first sealed cavity 81, and the first hole 3a1 is used to discharge the coolant from the first sealed cavity 81. After the coolant enters from the second channel 3b, it flows out from the second hole 3b1 of the second channel 3b and enters the first sealed cavity 81. After heat exchange with the heat conducting member 5 in the first sealed cavity 81, the coolant passes through the first hole 3a1 and flows into the first channel 3a, thereby forming a first cooling circuit.

[0058] More specifically, there can be multiple first holes 3a1, which are evenly spaced and arranged along the circumference of the rotating shaft 3, and are respectively connected to the first sealed cavity 81. Similarly, there can be multiple second holes 3b1, which are evenly spaced and arranged along the circumference of the rotating shaft 3, and are respectively connected to the first sealed cavity 81. The number of first holes 3a1 and second holes 3b1 can be set as needed.

[0059] In order to ensure the smooth circulation of the first cooling circuit, the first hole 3a1 and the second hole 3b1 form a height difference along the axial direction of the rotating shaft 3. When the first channel 3a is a liquid inlet channel and the second channel 3b is a liquid outlet channel, the height of the first hole 3a1 along the axial direction of the rotating shaft 3 is lower than the height of the second hole 3b1. The closer the position of the first hole 3a1 is to the bottom of the first sealed cavity 81, the better, and the closer the position of the second hole 3b1 is to the top of the first sealed cavity 81, the better, so that the coolant can fill the first sealed cavity 81 when circulating in the first cooling circuit, and the heat-conducting member 5 can fully exchange heat with the coolant.

[0060] Of course, when the first channel 3a is the liquid outlet channel and the second channel 3b is the liquid inlet channel, the height settings of the first hole 3a1 and the second hole 3b1 along the axial direction of the rotating shaft 3 are exactly opposite to the above, that is, the height of the second hole 3b1 along the axial direction of the rotating shaft 3 is lower than the height of the first hole 3a1, and the closer the position of the second hole 3b1 is to the bottom of the first sealed cavity 81, the better, and the closer the position of the first hole 3a1 is to the top of the first sealed cavity 81, the better, so that it is convenient for the coolant to fill the first sealed cavity 81 when circulating in the first cooling circuit, so that the heat conductive part 5 and the coolant can have sufficient heat exchange.

[0061] It should be noted that the first hole 3 a 1 and the second hole 3 b 1 are respectively located on both sides of the heat-conducting member 5 along the axial direction of the rotating shaft 3 , so that the coolant can fully contact the surface of the heat-conducting member 5 .

[0062] In the present invention, after the coolant enters from the first channel 3a, it flows into the first sealed cavity 81 through the first hole 3a1, and after heat exchange with the heat conductor 5, it flows out from the second hole 3b1 and enters the second channel 3b. In this way, the cooling cycle does not pass through the stator structure 4, and the coolant will not enter the air gap between the stator structure 4 and the rotor structure 2.

[0063] It should be noted that no cooling channel is provided in the support member 21 of the rotor structure 2, or the position of the heat conductor 5 is not replaced by a cooling channel. The main reason is that if a cooling channel is provided in the support member 21 of the rotor structure 2 or the heat conductor 5 is directly replaced by a cooling channel, the coolant will enter the air gap between the stator structure 4 and the rotor structure 2, which will cause a large oil stirring loss. This is mainly because if the air gap is filled with oil, the rotor structure 2 needs to resist a large resistance when rotating, so that the efficiency of the motor is significantly reduced and the loss is large. Therefore, it is not feasible to provide a cooling channel in the support member 21 of the rotor structure 2 or replace the position of the heat conductor 5 with a cooling channel.

[0064] In addition, the liquid inlet channel and the liquid outlet channel are staggered in the direction from the non-output end 32 to the output end 31 of the rotating shaft 3. More specifically, the extension length of the liquid inlet channel toward the output end 31 along the axial direction exceeds the extension length of the liquid outlet channel toward the output end 31, so that the liquid inlet and the liquid outlet form a circulation loop.

[0065] The inner wall of the first channel 3a extends out of the front shell structure 11 along the axial direction of the rotating shaft 3. The end of the first channel 3a extending out of the shell 1 is formed with a liquid inlet 3a2, and the end of the second channel 3b extending out of the shell 1 is provided with a liquid outlet 3b2, so that the cooling liquid enters the first channel 3a from the liquid inlet 3a2, and flows out from the second channel 3b through the liquid outlet 3b2 after circulation.

[0066] Since conventional disc motors have stator structures on both sides and a rotor structure in the middle, and the rotor structure is formed by laminating composite materials with low thermal conductivity, the magnetic steel will generate heat due to loss in the disc motor. In the case of long-term operation, the magnetic steel 22 will be demagnetized due to the inability to dissipate heat due to excessive temperature, resulting in a continuous decline in the performance of the disc motor and affecting the normal operation of the disc motor. In the present invention, the heat conductive member 5 is arranged in the support member 21 and between two adjacent magnetic steels 22. The heat conductive member 5 extends radially along the support member 21 to the cooling channel, and heat is transferred through the heat conductive member 5, so that the problem that the magnetic steel 22 cannot dissipate heat can be solved.

[0067] The heat of the magnetic steel 22 is transferred to the heat conductive part 5, and the heat conductive part 5 then transfers the heat to the coolant in the cooling channel, so that the cooling of the magnetic steel 22 can be achieved. Specifically, a heat conductive part 5 is provided between two adjacent magnetic steels 22. It should be noted that the closer the distance of the heat conductive part 5 to the magnetic steel 22 in the circumferential direction, the better the heat conduction effect, which can reduce the conduction path between the magnetic steel 22 and the heat conductive part 5, that is, the closer the heat conductive part 5 is to the magnetic steel 22, the better the conduction effect. In order to ensure the overall conduction effect, the heat conductive part 5 is provided in the middle position between two adjacent magnetic steels 22, so that the heat conduction effect of the two adjacent magnetic steels 22 can be guaranteed.

[0068] Of course, in order to improve the heat conduction effect, the wider the width of the heat conductor 5 along the circumference of the rotor structure 2, the better, so that the heat transfer efficiency is higher; however, if the heat conductor 5 is too wide, it will affect the strength of the rotor structure 2. Therefore, under the premise of ensuring strength, the wider the width of the heat conductor 5 along the circumference, the better. Since the rotor structure 2 is arranged in a disc shape, considering the overall strength of the rotor structure 2, the width of the heat conductor 5 along the circumference is gradually narrowed toward the direction close to the rotating shaft 3, so that the conduction effect of the heat conductor 5 can be maximized under the premise of ensuring strength.

[0069] The thicker the thickness of the heat conducting member 5 along the axial direction, the better the heat conducting effect. However, since the thickness of the heat conducting member 5 is too thick, it will affect the overall strength. Therefore, the thickness of the heat conducting member 5 along the axial direction is D1, and the thickness of the support member 21 of the rotor structure 2 is D, and D1≤D / 3. In this embodiment, D1 is D / 3, so that the heat conducting effect of the heat conducting member 5 is optimal while ensuring the overall strength.

[0070] The heat conducting member 5 is usually made of a material with high thermal conductivity, such as a heat pipe, or ceramic. In other feasible embodiments, it can also be other heat conducting materials. The heat conducting member 5 has a fixed end 51 and a heat dissipation end 52 located at both ends, respectively. The fixed end 51 is installed in the support member 21, and the heat dissipation end 52 extends to the first cooling circuit, and heat is dissipated by the coolant in the first cooling circuit. The coolant is usually cooling oil. In other embodiments, it can also be other coolants. There is no specific limitation here, and it can be set according to specific needs.

[0071] The heat dissipation end 52 of the heat conductor 5 extends out of the support member 21 and extends into the first cooling circuit. The larger the area of ​​the heat dissipation end 52 extending into the first cooling circuit, the better the cooling effect. However, the heat dissipation end 52 cannot extend onto the rotating shaft 3 and abut against the rotating shaft 3. That is, there must be a gap between the heat dissipation end 52 and the rotating shaft 3. Since the heat conductor 5 itself will form a voltage difference after the rotor structure 2 rotates, it is equivalent to that the heat conductor 5 itself will generate a part of the current. Assuming that the heat dissipation end 52 of the heat conductor 5 abuts against the rotating shaft 3 at this time, the current path will be relatively large, and the heat generation will be greater than before, which is equivalent to the heat conductor 5 and the rotating shaft 3 and the rotor structure 2 forming an integral whole. At this time, the eddy current circuit will be relatively large, and the self-heating will be relatively large. Therefore, the heat dissipation end 52 is spaced apart from the outer wall of the rotating shaft 3, so that the heat conductor 5 can be prevented from forming an integral whole with the rotating shaft 3 and increasing the heat generation. In this embodiment, the heat dissipation end 52 of the heat conductive member 5 extends beyond the support member 21 to the first cooling circuit, and the heat dissipation end 52 is arranged close to the rotating shaft 3 and spaced apart from the rotating shaft 3. This can increase the resistance to the flow of the coolant and the heat conduction area so that the coolant and the heat conductive member 5 can have sufficient heat exchange, and on the other hand, it can prevent the heat dissipation end 52 from abutting against the rotating shaft 3 and generating heat.

[0072] In order to facilitate the installation of the rotor structure 2, as Figure 4 As shown, an annular boss 33 is provided on the rotating shaft 3. The annular boss 33 can be arranged on the side of the rotor structure 2 close to the non-output end 32 of the rotating shaft 3, or can be arranged on the side of the rotor structure 2 away from the non-output end 32 of the rotating shaft 3. There is no specific limitation and it can be arranged according to actual needs. One side of the rotor structure 2 is sealed and mounted on the annular boss 33, and the other side is sealed and fixed by the annular pressure plate 73. A first sealed cavity 81 is formed between the annular pressure plate 73, the inner wall of the central hole 23 of the support member 21, the annular boss 33, and the outer wall of the rotating shaft 3.

[0073] More specifically, the rotor structure 2 abuts against the annular boss 33 and is sealed with the annular boss 33. The annular pressure plate 73 is pressed on the other side of the rotor structure 2 and the rotor structure 2 and the annular boss 33 are fixed together. The annular pressure plate 73 and the rotor structure 2 are also sealed and crimped.

[0074] The annular pressure plate 73 may be fixed to the rotor structure 2 and the annular boss 33 by bolts, or other detachable connection methods, which are not listed here. The sealing between the annular boss 33 and the rotor structure 2 may adopt a conventional sealing method, such as a sealing gasket; similarly, the sealing between the annular pressure plate 73 and the rotor structure 2 may adopt a conventional sealing method, such as a sealing gasket.

[0075] More specifically, a first sealing gasket 63 is disposed between one side of the support member 21 and the annular boss 33 , and a second sealing gasket 64 is disposed between the annular pressure plate 73 and the other side of the support member 21 .

[0076] In order to facilitate installation and prevent leakage of coolant, a first sealing cover 9 is provided outside the liquid outlet 3b2. The first sealing cover 9 is provided on the front shell structure 11 and has a first clearance hole 91 for the inner wall of the first channel 3a to extend. During installation, after the wall surface of the first channel 3a of the rotating shaft 3 extends out of the first clearance hole 91, the first sealing cover 9 is sealed with the outer surface of the front shell structure 11. In this way, the first sealing cover 9 and the front shell structure 11 are surrounded to form a second sealing cavity 82, and the second sealing cavity 82 is connected to the liquid outlet 3b2. At this time, the first channel 3a extends out of the second sealing cavity 82, and the liquid outlet 3b2 is exposed outside the front shell structure 11 and the first sealing cover 9.

[0077] The first sealing cover 9 is provided with a through hole 92, so that the coolant flows out from the liquid outlet 3b2, enters the second sealing cavity 82, and then flows out from the through hole 92. The through hole 92 can be connected to other pipes as needed, and no specific limitation is made here.

[0078] Conventionally, the first cooling circuit of the rotor is connected to the second cooling circuit of the stator structure 4 inside the housing 1, which places very high demands on sealing. Even if the sealing is good, the occurrence of seal aging or seal damage will cause the coolant to spray directly from the stator structure 4 to the rotor structure 2 and enter the air gap between the stator structure 4 and the rotor structure 2. On the one hand, the amount of coolant is difficult to control, and on the other hand, too much coolant enters the air gap between the stator structure 4 and the rotor structure 2, which will cause a relatively large oil stirring loss. Therefore, the present invention extends the liquid outlet 3b2 of the cooling channel to the outside to solve this problem. More specifically, the through hole 92 can be connected to the second cooling circuit of its stator structure 4 through a pipeline, that is, the first cooling circuit of the rotor and the second cooling circuit of the stator structure 4 can be connected outside the housing 1, rather than inside the housing 1, avoiding connection inside the housing 1.

[0079] More specifically, the liquid outlet 3b2 of the second channel 3b is connected to the second cooling circuit of the stator structure 4, and the coolant flowing out of the liquid outlet 3b2 of the second channel 3b enters the second cooling circuit of the stator structure 4 as the inlet oil, so that the first cooling circuit of the rotor structure 2 and the second cooling circuit of the stator structure 4 can be connected together outside the shell 1.

[0080] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the present invention.

Claims

1. A disc motor, characterized in that: include: case; The rotor structure comprises a disc-shaped support member and a plurality of magnetic steels arranged along the circumference of the support member, wherein the support member is provided with a central hole; a rotating shaft, which passes through the central hole and is rotatably disposed on the housing, wherein a cooling channel is formed in the rotating shaft, and the cooling channel is connected to the central hole to form a first cooling circuit; and The heat conducting member is disposed in the supporting member and between two adjacent magnetic steels, and the heat conducting member extends to the first cooling circuit along the radial direction of the supporting member.

2. The disc motor according to claim 1, characterized in that: The inner wall of the central hole, the heat conducting member, and the periphery of the rotating shaft surround the central hole to form a first sealed cavity; A first channel and a second channel extending in the axial direction are respectively disposed in the rotating shaft. The first channel and the second channel are spaced apart in the radial direction. The first channel and the second channel are respectively communicated with the first sealing cavity and together form the first cooling circuit.

3. The disc motor according to claim 2, characterized in that: The heat conducting member has a fixed end and a heat dissipation end respectively located at both ends, the fixed end is installed in the supporting member, the heat dissipation end extends out of the supporting member along the radial direction of the supporting member and extends into the first cooling circuit, and the heat dissipation end is arranged close to the rotating shaft and has a gap with the rotating shaft.

4. The disc motor according to claim 2, characterized in that: The thickness of the heat conducting member along the axial direction is D1, and the thickness of the supporting member along the axial direction is D, where D1≤D / 3.

5. The disc motor according to claim 2, characterized in that: The first channel and the second channel respectively have a first hole and a second hole extending outside the rotating shaft, the first channel and the second channel are respectively connected to the first sealing cavity through the first hole and the second hole, one of the first channel and the second channel is a liquid inlet channel, and the other is a liquid outlet channel; The first hole and the second hole form a height difference along the axial direction of the rotating shaft, wherein, when the first channel is a liquid inlet channel and the second channel is a liquid outlet channel, the height of the first hole is lower than the height of the second hole; when the second channel is a liquid inlet channel and the first channel is a liquid outlet channel, the height of the second hole is lower than the height of the first hole.

6. The disc motor according to claim 5, characterized in that: The second channel is arranged around the first channel, the first channel is a liquid inlet channel, and the second channel is a liquid outlet channel.

7. The disc motor according to claim 6, characterized in that: The end of the first channel extending out of the shell is formed with a liquid inlet, the end of the second channel extending out of the shell is provided with a liquid outlet, the outside of the liquid outlet is provided with a first sealing cover, the first sealing cover is provided on the shell and has a first clearance hole for the wall surface of the first channel to extend out; After the wall surface of the first channel extends out of the first clearance hole, the first sealing cover is sealed with the outer surface of the shell, the first sealing cover and the shell are surrounded to form a second sealing cavity, and the second sealing cavity is communicated with the liquid outlet; The first channel extends out of the second sealing cavity, and the liquid outlet is exposed to the outside of the housing and the first sealing cover.

8. The disc motor according to claim 7, characterized in that: The cooling circuit of the rotor structure is connected to the cooling circuit of the stator structure outside the housing.

9. The disc motor according to claim 2, characterized in that: An annular boss is provided on the rotating shaft; One side of the support is sealingly mounted on the annular boss, and the other side is sealingly fixed by an annular pressure plate; The first sealing cavity is formed between the annular pressure plate, the inner wall of the central hole of the support member, the annular boss, and the outer wall of the rotating shaft.

10. The disk motor according to claim 9, characterized in that: A first sealing gasket is arranged between one side of the support member and the annular boss, and a second sealing gasket is arranged between the annular pressure plate and the other side of the support member.

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