Axial flux motor heat dissipation system

Abstract

The utility model belongs to the technical field of axial magnetic flux motors, and discloses an axial magnetic flux motor heat dissipation system, which comprises a motor shell, a rotor shaft and a magnetic steel support, the rotor shaft and the magnetic steel support are jointly provided with an internal heat dissipation structure, and the motor shell is provided with an external heat dissipation structure. The internal heat dissipation structure comprises a plurality of annularly arranged flat heat pipes, each flat heat pipe is installed on the magnetic steel support, an axial cooling flow channel penetrates through the axis of the rotor shaft, and the external heat dissipation structure comprises cooling water channels arranged on the two inner end walls of the motor shell. A first cover plate and a second cover plate are tightly installed on the two inner walls of the motor shell respectively, and a plurality of rib plates are evenly distributed on the inner circumferential wall of the motor shell. According to the utility model, an internal and external combined heat dissipation mode is adopted, rapid release of internal heat of the motor is realized, reduction of internal temperature is beneficial to protection of magnetic steel, balance of temperature distribution of the motor can be further ensured, and the performance of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flux motors, in particular to a heat dissipation system for axial flux motors. Background Art

[0002] The axial flux motor, a highly promising motor topology, features stator electromagnetic wiring parallel to a disc-shaped rotor containing permanent magnets. Its operating principle is based on electromagnetic induction and magnetic field interaction. In an axial flux motor, the magnetic fields of the stator and rotor interact axially. When current flows through the stator windings, a rotating magnetic field is generated. The magnetic lines of force of this field axially cross the air gap and interact with the magnetic field generated by the permanent magnets or field windings on the rotor. This rotation of the stator magnetic field generates a torque on the rotor, causing it to rotate.

[0003] However, due to the unique structure of axial flux motors, heat dissipation is a major challenge. Heat generation in motors is primarily due to copper and iron losses. Therefore, the primary heat-generating components are losses in the coil windings and core. If the heat generated by the motor cannot be dissipated, it will severely damage the insulation and magnetic materials, and may even burn out the motor.

[0004] In the Chinese utility model patent application number 202323078945.9, an axial flux motor is proposed. The main problem with this patent is that the axial flux motor dissipates heat from the motor through a water-cooling cover arranged on the end face of the motor housing, and adopts an external water-cooling heat dissipation method. This heat dissipation method can quickly take away the heat from the surface of the motor, but the heat accumulated inside the motor is difficult to release, which will cause poor internal heat dissipation effect of the motor, low motor power, and excessively high rotor temperature, which is likely to have an adverse effect on the permanent magnet. Utility Model Content

[0005] The main technical problem to be solved by the present invention is to provide an axial flux motor heat dissipation system, which adopts a combined internal and external heat dissipation method to achieve rapid release of heat inside the motor. The reduction in internal temperature is not only beneficial to protecting the magnetic steel, but also can further ensure the balance of the motor temperature distribution and improve the motor performance.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] An axial flux motor heat dissipation system includes a motor housing, a rotor shaft is disposed through the motor housing, a magnetic steel bracket is disposed between the rotor shaft and the motor housing, an internal heat dissipation structure is disposed on the rotor shaft and the magnetic steel bracket, and an external heat dissipation structure is disposed on the motor housing;

[0008] The internal heat dissipation structure includes a plurality of flat heat pipes arranged in a ring shape, each flat heat pipe is arranged along the radial direction of the magnetic steel support, each flat heat pipe is mounted on the magnetic steel support, and an axial cooling channel is provided through the axis of the rotor shaft;

[0009] The external heat dissipation structure includes cooling water channels arranged on the two inner end walls of the motor housing. The first cover plate and the second cover plate are tightly installed on the two inner walls of the motor housing respectively, and a plurality of ribs are evenly distributed on the inner peripheral wall of the motor housing.

[0010] The following is a further optimization of the above technical solution by the present invention:

[0011] The magnetic steel bracket includes a ring plate, and a number of magnetic ribs are arranged on the side walls of the ring plate. Each magnetic rib is arranged along the radial extension of the ring plate. Each magnetic rib and the ring plate are jointly provided with an installation groove, and each flat heat pipe is installed in the corresponding installation groove.

[0012] Further optimization: the end of each flat plate heat pipe extends to the axial hole surface of the ring plate.

[0013] Further optimization: the motor casing includes a left shell and a right shell arranged relatively to each other, a first through hole is opened in the middle of the left shell, the rotor shaft extends out of the outside of the motor casing through the first through hole, and the two cooling water channels are respectively arranged on the inner end walls of the left shell and the right shell, the first cover plate is sleeved on the rotor shaft and pressed on the inner end wall of the left shell, and the second cover plate is pressed on the inner end wall of the right shell.

[0014] Further optimization: all the ribs are divided into two groups, and the two groups of ribs are evenly distributed on the inner circumferential walls of the left shell and the right shell respectively, and each rib is extended along the axial direction of the rotor shaft.

[0015] Further optimization: each rib is a triangular rib.

[0016] Further optimization: each rib is a strip rib.

[0017] The utility model adopts the above technical solution, which has the following beneficial effects: the utility model sets an internal heat dissipation structure on the rotor shaft and the magnetic steel bracket, realizes the cooling of the interior of the motor and the rotor shaft, is beneficial to the rapid release of heat accumulated inside the motor, thereby effectively reducing the temperature of the rotor magnetic steel, protecting the rotor magnetic steel, and thus improving the performance of the motor.

[0018] An external heat dissipation structure is provided on the motor housing. The external heat dissipation structure includes a plurality of ribs provided on the motor housing and a cooling water channel through which coolant passes, thereby accelerating the heat dissipation speed on the motor surface.

[0019] The combined internal and external heat dissipation method is conducive to quickly reducing the internal temperature of the motor and further ensuring the balanced distribution of the motor temperature.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model;

[0023] Figure 2 This is a schematic structural diagram of the rotor shaft in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the magnetic steel bracket in the embodiment of the present utility model;

[0025] Figure 4 It is a structural schematic diagram of the left shell in an embodiment of the present utility model.

[0026] In the figure: 1-motor housing; 11-left housing; 12-right housing; 13-first through hole; 2-rotor shaft; 3-magnetic steel bracket; 31-ring plate; 32-magnetic rib plate; 33-mounting slot; 4-internal heat dissipation structure; 41-flat heat pipe; 42-axial cooling channel; 5-external heat dissipation structure; 51-cooling water channel; 52-first cover plate; 53-second cover plate; 54-rib plate; 55-inlet and outlet; 6-stator; 7-potting glue; 8-magnetic steel. DETAILED DESCRIPTION

[0027] 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 only 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.

[0028] like Figure 1-Figure 4As shown together, an axial flux motor heat dissipation system includes a motor housing 1, a rotor shaft 2 is arranged through the motor housing 1, a magnetic steel bracket 3 is arranged between the rotor shaft 2 and the motor housing 1, an internal heat dissipation structure 4 is arranged on the rotor shaft 2 and the magnetic steel bracket 3, and an external heat dissipation structure 5 is arranged on the motor housing 1.

[0029] In this embodiment, the internal structure, installation position and relationship, and working principle of the axial flux motor all constitute the prior art and are well known to ordinary technicians in this field, and will not be described in detail here.

[0030] In this embodiment, a combined internal and external heat dissipation structure is adopted, which is beneficial to reducing the heat inside the motor, solving the problem of difficult internal heat dissipation in the double-stator single-rotor topology motor, further ensuring the balance of the motor temperature distribution, and the reduction of the internal temperature is beneficial to protecting the magnetic steel 8, thereby improving the motor performance.

[0031] In this embodiment, the magnetic steel support 3 and the rotor shaft 2 are mounted together through the positioning pin shaft hole, and the permanent magnet and the magnetic steel support 3 are bonded together.

[0032] In this embodiment, the magnetic steel support 3, the permanent magnets and the rotor shaft 2 together constitute the rotor part of the permanent magnet synchronous axial flux motor.

[0033] The internal heat dissipation structure 4 includes a plurality of flat heat pipes 41 arranged in a ring shape. Each flat heat pipe 41 is arranged to extend radially along the magnetic steel support 3. Each flat heat pipe 41 is installed on the magnetic steel support 3. An axial cooling channel 42 is provided through the axis of the rotor shaft 2.

[0034] In this embodiment, the rotor shaft 2 is a hollow structure. The hollow portion inside the rotor shaft 2 constitutes an axial cooling channel 42. The two ends of the axial cooling channel 42 are respectively connected to a coolant inlet pipe (not shown in the figure) and a coolant outlet pipe (not shown in the figure), so that a steady stream of coolant passes through the axial cooling channel 42 to quickly remove the heat inside the motor.

[0035] The external heat dissipation structure 5 includes cooling water channels 51 arranged on the two inner end walls of the motor housing 1. A first cover plate 52 and a second cover plate 53 are tightly mounted on the two inner walls of the motor housing 1 respectively. A plurality of ribs 54 are evenly distributed on the inner peripheral wall of the motor housing 1.

[0036] In this embodiment, not only can ribs 54 be provided on the inner peripheral wall of the motor housing 1, but the inner peripheral wall of the motor housing 1 can also be provided in a wavy shape (not shown in the figure), both of which can accelerate the heat dissipation speed of the motor surface.

[0037] In this embodiment, both ends of the cooling water channel 51 are further provided with cooling liquid inlets and outlets 55 for the circulation of the cooling liquid.

[0038] like Figure 1 and Figure 3 As shown in the figures, the magnetic steel bracket 3 includes a ring plate 31, and a number of magnetic ribs 32 are evenly distributed on the side walls of the ring plate 31. Each magnetic rib 32 is arranged along the radial extension of the ring plate 31. Each magnetic rib 32 and the ring plate 31 are commonly provided with a mounting groove 33, and each flat heat pipe 41 is installed in the corresponding mounting groove 33.

[0039] like Figure 3 As shown, the end of each flat plate heat pipe 41 extends to the axial hole surface of the ring plate 31 .

[0040] In this embodiment, the mounting groove 33 penetrates the entire magnetic rib plate 32 and the ring plate 31 along the radial direction of the ring plate 31 , so that the flat heat pipe 41 in the mounting groove 33 extends all the way to the surface of the inner shaft hole on the ring plate 31 .

[0041] In this embodiment, the flat heat pipe 41 is combined with the rotor shaft 2 after assembly, and can quickly conduct the heat from the magnet 8 on the magnet bracket 3 to the rotor shaft 2, and use the axial cooling flow channel 42 inside the rotor shaft 2 to quickly release the heat accumulated inside the motor.

[0042] like Figure 1 and Figure 4 As shown together, the motor housing 1 includes a left shell 11 and a right shell 12 arranged opposite to each other. A first through hole 13 is opened in the middle of the left shell 11, and the rotor shaft 2 extends out of the motor housing 1 through the first through hole 13. Two cooling water channels 51 are respectively arranged on the inner end walls of the left shell 11 and the right shell 12. The first cover plate 52 is sleeved on the rotor shaft 2 and pressed against the inner end wall of the left shell 11. The second cover plate 53 is pressed against the inner end wall of the right shell 12.

[0043] In this embodiment, a stator 6 is further provided inside the motor housing 1 , and the stator 6 is fixed to the motor housing 1 by a potting compound 7 . The provision of the ribs 54 is beneficial to expanding the contact area between the motor housing 1 and the potting compound 7 .

[0044] In this embodiment, the potting compound 7 is made of epoxy resin, and its thermal conductivity is generally between 0.2-0.3 W / mK.

[0045] In this embodiment, the cooling water channel 51 is provided on the inner end walls of the left shell 11 and the right shell 12 in an S-shaped wave-like extension.

[0046] In this embodiment, the cooling water channel 51 is arranged in a semi-open state, which is very convenient for processing.

[0047] In this embodiment, the first cover plate 52 and the second cover plate 53 are provided to separate the two cooling water channels 51 from the interior of the motor, thereby sealing the cooling water channels 51 and fixing the stator 6 .

[0048] In this embodiment, the first cover plate 52 and the second cover plate 53 are detachably mounted on the left housing 11 and the right housing 12 respectively by screws.

[0049] All the ribs 54 are divided into two groups. The two groups of ribs 54 are evenly distributed on the inner circumferential walls of the left shell 11 and the right shell 12 , respectively. Each rib 54 extends along the axial direction of the rotor shaft 2 .

[0050] like Figure 4 As shown, each rib 54 is a triangular rib.

[0051] Each rib 54 is a strip-shaped rib.

[0052] In this embodiment, the ribs 54 are not limited to triangular or strip-shaped ribs, and ribs of other shapes that can achieve the above-mentioned heat dissipation function are also acceptable.

[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An axial flux motor heat dissipation system, comprising a motor housing (1), a rotor shaft (2) passing through the motor housing (1), and a magnetic steel bracket (3) disposed between the rotor shaft (2) and the motor housing (1), characterized in that: The rotor shaft (2) and the magnetic steel bracket (3) are both provided with an internal heat dissipation structure (4), and the motor housing (1) is provided with an external heat dissipation structure (5); The internal heat dissipation structure (4) includes a plurality of flat heat pipes (41) arranged in a ring shape, each flat heat pipe (41) is arranged along the radial direction of the magnetic steel support (3), and each flat heat pipe (41) is mounted on the magnetic steel support (3). An axial cooling channel (42) is provided through the axis of the rotor shaft (2); The external heat dissipation structure (5) comprises cooling water channels (51) arranged on the two inner end walls of the motor housing (1), a first cover plate (52) and a second cover plate (53) are tightly mounted on the two inner walls of the motor housing (1), and a plurality of ribs (54) are evenly distributed on the inner peripheral wall of the motor housing (1).

2. The axial flux motor heat dissipation system according to claim 1, characterized in that: The magnetic steel bracket (3) includes a ring plate (31), and a plurality of magnetic conductive ribs (32) are arranged on the side walls of the ring plate (31). Each magnetic conductive rib (32) is arranged along the radial direction of the ring plate (31). Each magnetic conductive rib (32) and the ring plate (31) are both provided with a mounting groove (33), and each flat heat pipe (41) is installed in a corresponding mounting groove (33).

3. The axial flux motor heat dissipation system according to claim 2, characterized in that: The end of each flat plate heat pipe (41) extends to the axial hole surface of the ring plate (31).

4. The axial flux motor heat dissipation system according to claim 1, characterized in that: The motor housing (1) comprises a left housing (11) and a right housing (12) arranged relative to each other, a first through hole (13) is opened in the middle of the left housing (11), and the rotor shaft (2) extends out of the motor housing (1) through the first through hole (13), two cooling water channels (51) are respectively arranged on the inner end walls of the left housing (11) and the right housing (12), a first cover plate (52) is sleeved on the rotor shaft (2) and pressed against the inner end wall of the left housing (11), and a second cover plate (53) is pressed against the inner end wall of the right housing (12).

5. The axial flux motor heat dissipation system according to claim 4, characterized in that: All the ribs (54) are divided into two groups. The two groups of ribs (54) are evenly distributed on the inner peripheral walls of the left shell (11) and the right shell (12), respectively. Each rib (54) is extended along the axial direction of the rotor shaft (2).

6. The axial flux motor heat dissipation system according to claim 5, characterized in that: Each rib (54) is a triangular rib.

7. The axial flux motor heat dissipation system according to claim 5, characterized in that: Each rib (54) is a strip rib.

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