Oil-cooled axial flux motor structure

Abstract

The invention relates to the technical field of magnetic flux motors, in particular to an oil-cooled axial magnetic flux motor structure. The cooling oil channel of the stator assembly is formed by the shell, the end covers and the stator supports, and cooling oil is sprayed to a winding through the stator oil spraying opening so as to directly cool a stator winding coil. Meanwhile, cooling oil flows into the rotor assembly through the oil guide hole to cool the permanent magnet, a loop is formed in the rotor assembly, the cooling oil cools the permanent magnet and the rotor through the cooling loop, and then the cooling oil flows out to the cooling oil outlet through the oil duct; through the cooling structure, the cooling effect of the motor winding and the permanent magnet can be greatly improved, the tooth part and the bottom of the stator core are respectively processed and then installed together, the tooth part of the stator core is made of a soft magnetic material and can be integrally formed, the bottom is made of a silicon steel sheet, and the influence on the electromagnetic performance is reduced as much as possible while the processing difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flux motors, and in particular to an oil-cooled axial flux motor structure. Background Art

[0002] Compared with traditional radial flux permanent magnet synchronous motors, axial flux permanent magnet synchronous motors have a more compact axial structure, greater torque density and power density, and are receiving more and more attention.

[0003] Due to its special structure, the outer end winding of the axial flux motor is longer, resulting in large resistance loss and more heat generation; the inner end winding is in close contact, resulting in heat accumulation. At the same time, compared with the winding in the stator core slot, the heat dissipation condition of the end winding is worse. Therefore, the highest temperature point of the axial flux motor winding is generally at the winding. To improve the torque density and power density of the motor, it is necessary to create good heat dissipation conditions for the winding.

[0004] For the dual-stator single-rotor axial flux motor, its structure is a stator on both sides of the middle rotor, and both sides of the rotor are close to the largest heat source inside the motor - the motor winding. In addition, the permanent magnet itself will also produce losses, and excessive temperature will cause the demagnetization of the permanent magnet, which directly affects the performance of the motor.

[0005] Traditional axial flux motors generally dissipate heat through cooling fins on the base and end covers on both sides or water cooling of the end covers. However, relying solely on this form of heat dissipation, when the stator core and the end cover are in poor contact and the load is large, the large amount of heat generated by the motor winding cannot be removed in time. In addition, the permanent magnet cannot be effectively cooled. For this reason, we propose an oil-cooled axial flux motor structure. Summary of the invention

[0006] The object of the present invention is to provide an oil-cooled axial flux motor structure to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] An oil-cooled axial flux motor structure includes a shell, which is connected to a non-driving end cover and a driving end cover by bolts. A stator assembly and two rotor assemblies are arranged in the shell. Cooling oil channels are arranged on the shell and the end covers, and cooling oil flows into the rotor assembly and the stator assembly for cooling, thereby achieving the purpose of reducing the temperature of the axial flux motor.

[0009] Preferably, the shell is provided with a total oil inlet and a total oil outlet; the non-driving end cover is provided with a non-driving end cover oil inlet, an oil distributor, a rotor oil inlet channel, a rotor oil outlet, a rotor oil outlet channel and a non-driving end cover oil outlet; the driving end cover is provided with a driving end cover oil inlet and a driving end cover oil outlet; the cooling oil flows in from the total oil inlet, passes through the non-driving end cover oil inlet and the driving end cover oil inlet and flows into the oil channels of the stator assemblies on both sides respectively, and the stator winding and the iron core are cooled by oil spraying; the non-driving end cover is provided with an oil distributor, and part of the cooling oil flows into the rotor oil inlet channel through the oil distributor to cool the rotor assembly, and then flows into the total oil outlet through the rotor oil outlet channel, the non-driving end cover oil outlet and the driving end cover oil outlet for circulation.

[0010] Preferably, the stator assembly consists of a stator oil channel, a stator bracket baffle, a stator bracket one, a winding coil, a stator core bottom, a stator core tooth portion, a stator bracket two and a stator bracket three; the stator oil channel consists of a stator annular flow channel, a stator oil channel outlet and a stator oil spray port; the stator core bottom and the stator core tooth portion are assembled together with the stator core mounting groove and the stator core mounting boss to form a stator core.

[0011] Preferably, the stator core teeth are integrally formed of soft magnetic material, the bottom of the stator core is made of silicon steel sheet material, the stator core teeth are assembled with the stator bracket two through the stator core teeth mounting groove, and the stator core is fixed in the middle by the stator bracket two and the stator bracket baffle to achieve axial positioning and circumferential positioning of the stator core.

[0012] Preferably, stator oil spraying ports are distributed on the stator oil passage, and after the cooling oil reaches the stator oil passage through the oil inlet of the drive end cover on the housing, the oil is sprayed through the stator oil spraying ports to cool the winding coil and the stator core.

[0013] Preferably, the rotor assembly consists of a rotor core, a rotating shaft and a permanent magnet, the permanent magnet is embedded in the rotor core, and the rotor core and the rotating shaft are connected by a key.

[0014] Preferably, the cooling oil flows into the oil inlet of the shaft through the oil channel on the non-driving end cover, and then flows into the rotor core oil inlet channel, and the rotor oil inlet annular oil channel is connected with the rotor oil outlet annular oil channel, and the cooling oil flows into the rotor core oil outlet channel and the shaft oil outlet through the rotor core oil inlet channel, the rotor oil inlet annular oil channel, and the rotor oil outlet annular oil channel in sequence.

[0015] Preferably, the stator support baffle, stator support one, winding coil, stator core tooth portion, stator core bottom portion and stator oil channel are symmetrically arranged in the shell, including stator support baffle two, stator support four, winding coil two, stator core tooth portion two, stator core bottom portion two and stator oil channel two, and the stator oil channel two is composed of stator annular flow channel two and stator oil channel outlet two.

[0016] It can be seen without a doubt that the above-mentioned technical solution of the present application can definitely solve the technical problem to be solved by the present application.

[0017] At the same time, through the above technical solutions, the present invention has at least the following beneficial effects:

[0018] 1. The present invention provides an axial magnetic flux motor structure, in which a cooling oil channel of the stator assembly is formed by a housing, an end cover and a stator bracket, and then cooling oil is poured onto the winding through the stator oil pouring port to directly cool the stator winding coil; at the same time, cooling oil flows into the rotor assembly through the oil guide hole to cool the permanent magnet, and a loop is formed inside the rotor assembly. The cooling oil cools the permanent magnet and the rotor through the cooling loop, and then flows out to the cooling oil outlet through the oil channel. Through this cooling structure, the cooling effect of the motor winding and permanent magnet can be greatly improved.

[0019] 2. The teeth and bottom of the stator core of the present invention are processed separately and then installed together. The teeth of the stator core are made of soft magnetic material and can be formed in one piece. The bottom is made of silicon steel sheet, which reduces the processing difficulty and minimizes the impact on electromagnetic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0021] Figure 1 A cross-sectional view of the axial flux motor of the present invention;

[0022] Figure 2 This is an appearance diagram of the axial flux motor of the present invention;

[0023] Figure 3 It is a schematic diagram of the non-driving end cover of the present invention;

[0024] Figure 4 It is a schematic diagram of the housing of the present invention;

[0025] Figure 5 It is a schematic diagram of the driving end cover of the present invention;

[0026] Figure 6 It is a schematic diagram of the stator assembly of the present invention;

[0027] Figure 7 An exploded view of the stator assembly of the present invention;

[0028] Figure 8 It is a schematic diagram of the bottom of the stator core of the present invention;

[0029] Fig. 9 It is a schematic diagram of the teeth of the stator core of the present invention;

[0030] Fig.10 It is a schematic diagram of the rotor assembly of the present invention;

[0031] Fig.11 is a cross-sectional view of a rotor assembly of the present invention;

[0032] Fig.12 It is a schematic diagram of the rotating shaft structure of the present invention;

[0033] Fig.13 It is a schematic diagram of the rotor core structure of the present invention.

[0034] In the accompanying drawings, the assemblies represented by the reference numerals are listed as follows:

[0035] In the figure: 1. Non-driving end cover; 101. Oil inlet of non-driving end cover; 102. Oil distribution port; 103. Rotor oil inlet channel; 104. Rotor oil outlet; 105. Rotor oil outlet channel; 106. Non-driving end cover oil outlet; 2. Housing; 201. Total oil inlet; 202. Total oil outlet; 3. Driving end cover; 301. Driving end cover oil inlet; 302. Driving end cover oil outlet; 4. Stator oil channel; 401. Stator annular flow channel; 402. Stator oil channel outlet; 403. Stator oil pouring port; 5. Stator bracket baffle; 6. Stator bracket one; 7. Winding coil; 8. Stator core bottom; 801. Stator core mounting slot; 9. Stator core tooth; 901, stator core mounting boss; 902, stator core tooth mounting groove; 10, rotor core; 1001, rotor core oil inlet channel; 1002, rotor oil inlet annular oil channel; 1003, rotor oil outlet annular oil channel; 1004, rotor core oil outlet channel; 11, shaft; 1101, shaft oil inlet; 1102, shaft oil outlet; 12, stator bracket baffle 2; 13, stator bracket 4; 14, winding coil 2; 15, stator core tooth 2; 16, stator core bottom 2; 17, stator oil channel 2; 1701, stator annular flow channel 2; 1702, stator oil channel outlet 2; 18, stator bracket 2; 19, stator bracket 3; 20, permanent magnet. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] Example 1

[0038] Reference Figure 1-13 An oil-cooled axial flux motor structure includes a shell 2, which is connected to a non-driving end cover 1 and a driving end cover 3 by bolts. A stator assembly and two rotor assemblies are arranged in the shell 2. Cooling oil channels are arranged on the shell 2 and the end covers, and cooling oil flows into the rotor assembly and the stator assembly for cooling, so as to achieve the purpose of reducing the temperature of the axial flux motor.

[0039] The housing is provided with a total oil inlet 201 and a total oil outlet 202; the non-driving end cover 1 is provided with a non-driving end cover oil inlet 101, an oil distributor 102, a rotor oil inlet passage 103, a rotor oil outlet 104, a rotor oil outlet passage 105 and a non-driving end cover oil outlet 106; the driving end cover 3 is provided with a driving end cover oil inlet 301 and a driving end cover oil outlet 302. The cooling oil flows in from the total oil inlet 201, passes through the non-driving end cover oil inlet 101 and the driving end cover oil inlet 301, and flows into the oil passages of the stator assemblies on both sides, respectively, to cool the stator winding and the iron core. Among them, the non-driving end cover 1 is provided with an oil distributor 102, and part of the cooling oil flows into the rotor oil inlet passage 103 through the oil distributor 102 to cool the rotor assembly. The oil then flows into the main oil outlet 202 through the rotor oil outlet passage 105, the non-driving end cover oil outlet 106 and the driving end cover oil outlet 302 for circulation.

[0040] The stator assemblies are mainly composed of stator oil passage 4, stator bracket baffle 5, stator bracket 1 6, winding coil 7, stator core bottom 8, stator core tooth 9, stator bracket 2 18 and stator bracket 3 19. The stator core bottom 8 and stator core tooth 9 are assembled together through the stator core mounting groove 801 and the stator core mounting boss 901 to form the stator core.

[0041] The stator core tooth material is a soft magnetic material, which can be formed in one piece, and each tooth is processed separately to reduce the processing difficulty; the stator core bottom is made of silicon steel sheet, which can reduce the impact of the use of soft magnetic materials on the electromagnetic field performance of the motor. The stator core tooth 9 is assembled with the stator bracket 2 18 through the stator core tooth mounting groove 902, and the stator core is fixed in the middle through the stator bracket 2 18 and the stator bracket baffle 5 to achieve axial positioning and circumferential positioning of the stator core.

[0042] Stator oil spraying ports 403 are distributed on the stator oil passage 4. After the cooling oil flows into the stator oil passage 4 through the inlet on the housing 2, the stator oil spraying ports 403 are used to spray the motor stator winding coil and the stator core. Then, the oil flows to the main outlet of the housing 2 through the stator oil passage outlet 402. At the same time, in order to prevent the cooling oil from entering the air gap between the stator and the rotor, the stator bracket 1 6, the stator bracket 3 19 and the stator bracket 2 18 are used to seal the stator assembly. The stator assemblies on both sides are the same.

[0043] The rotor assembly is composed of a rotor core 10, a rotating shaft 11 and a permanent magnet 20. The permanent magnet 20 is embedded in the rotor core 10, and the rotor core 10 and the rotating shaft 11 are connected by a key.

[0044] The stator support baffle 5, stator support one 6, winding coil 7, stator core tooth portion 9, stator core bottom portion 8 and stator oil channel 4 are symmetrically arranged in the housing 2 with stator support baffle two 12, stator support four 13, winding coil two 14, stator core tooth portion two 15, stator core bottom portion two 16 and stator oil channel two 17. The stator oil channel two 17 is composed of a stator annular flow channel two 1701 and a stator oil channel outlet two 1702. Due to the symmetrical arrangement, the functions they undertake are the same.

[0045] Example 2

[0046] Embodiment 1 is further optimized, specifically, as Figure 4 As shown, the cooling oil flows into the shaft oil inlet 1101 through the oil passage on the non-driving end cover 1, and then flows into the rotor core oil inlet passage 1001. The rotor oil inlet annular passage 1002 is connected with the rotor oil outlet annular passage 1003, and the cooling oil flows into the rotor core oil outlet passage 1004 through the rotor core oil inlet passage 1001, the rotor oil inlet annular passage 1002, and the rotor oil outlet annular passage 1003 in sequence, and then flows into the shaft oil outlet 1102. Then it flows through the oil passage on the end cover to the oil outlet. The cooling effect of the permanent magnet 20 and the rotor core is guaranteed.

[0047] From the above, we can know that:

[0048] The present invention is directed to the following technical problems: For a dual-stator single-rotor axial flux motor, its structure is a stator on both sides of the middle rotor, and both sides of the rotor are close to the largest heat source inside the motor - the motor winding. Moreover, the permanent magnet itself will also produce losses, and excessive temperature will cause demagnetization of the permanent magnet, which will directly affect the performance of the motor. Traditional axial flux motors generally dissipate heat through the heat dissipation fins on the base and the end covers on both sides or the end cover water cooling method. However, relying solely on this form of heat dissipation, when the contact between the stator core and the end cover is general and the load is large, the large amount of heat generated by the motor winding cannot be taken away in time. Moreover, the permanent magnet cannot be effectively cooled; adopting the technical solutions of the above embodiments and through the above settings, this application will inevitably solve the above technical problems.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. An oil-cooled axial flux motor structure, characterized in that: The invention comprises a housing (2), wherein the housing (2) is connected to a non-driving end cover (1) and a driving end cover (3) by bolts, wherein a stator assembly and two rotor assemblies are arranged in the housing (2), and cooling oil channels are arranged on the housing (2) and the end covers, and cooling oil flows into the rotor assembly and the stator assembly for cooling, thereby achieving the purpose of reducing the temperature of the axial flux motor.

2. The oil-cooled axial flux motor structure according to claim 1, characterized in that: The housing (2) is provided with a total oil inlet (201) and a total oil outlet (202); the non-driving end cover (1) is provided with a non-driving end cover oil inlet (101), an oil distribution port (102), a rotor oil inlet passage (103), a rotor oil outlet (104), a rotor oil outlet passage (105) and a non-driving end cover oil outlet (106); the driving end cover (3) is provided with a driving end cover oil inlet (301) and a driving end cover oil outlet (302); cooling oil flows in from the total oil inlet (201) and passes through the non-driving end cover. The oil inlet (101) of the moving end cover and the oil inlet (301) of the driving end cover flow into the oil passages of the stator assemblies on both sides respectively, so as to cool the stator winding and the iron core by spraying oil. The non-driving end cover (1) is provided with an oil distribution port (102), and part of the cooling oil flows into the rotor oil inlet passage (103) through the oil distribution port (102) to cool the rotor assembly, and then flows into the main oil outlet (202) through the rotor oil outlet passage (105), the non-driving end cover oil outlet (106) and the driving end cover oil outlet (302) to circulate.

3. The oil-cooled axial flux motor structure according to claim 1, characterized in that: The stator assembly is composed of a stator oil passage (4), a stator support baffle (5), a stator support one (6), a winding coil (7), a stator core bottom (8), a stator core tooth portion (9), a stator support two (18) and a stator support three (19); the stator oil passage (4) is composed of a stator annular flow passage (401), a stator oil passage outlet (402) and a stator oil spraying port (403); the stator core bottom (8) and the stator core tooth portion (9) are assembled together through a stator core mounting groove (801) and a stator core mounting boss (901) to form a stator core.

4. The oil-cooled axial flux motor structure according to claim 3 is characterized in that: The stator core tooth portion (9) is formed of an integrated soft magnetic material, the stator core bottom portion (8) is made of a silicon steel sheet material, the stator core tooth portion (9) is assembled with the second stator bracket (18) through the stator core tooth portion mounting groove (902), and the stator core is fixed in the middle through the second stator bracket (18) and the stator bracket baffle (5), thereby achieving axial positioning and circumferential positioning of the stator core.

5. The oil-cooled axial flux motor structure according to claim 3, characterized in that: Stator oil spraying ports (403) are distributed on the stator oil passage (4). After the cooling oil passes through the oil inlet (301) of the drive end cover on the housing (2) to the stator oil passage (4), the oil is sprayed through the stator oil spraying ports (403) to cool the winding coil (7) and the stator core.

6. The oil-cooled axial flux motor structure according to claim 1, characterized in that: The rotor assembly consists of a rotor core (10), a rotating shaft (11) and a permanent magnet (20); the permanent magnet (20) is embedded in the rotor core (10); and the rotor core (10) and the rotating shaft (11) are connected via a key.

7. The oil-cooled axial flux motor structure according to claim 1, characterized in that: The cooling oil flows into the shaft oil inlet (1101) through the oil passage on the non-driving end cover (1), and then flows into the rotor core oil inlet passage (1001), and the rotor oil inlet annular passage (1002) is connected to the rotor oil outlet annular passage (1003), and the cooling oil flows into the rotor core oil outlet passage (1004) and the shaft oil outlet (1102) in sequence through the rotor core oil inlet passage (1001), the rotor oil inlet annular passage (1002), and the rotor oil outlet annular passage (1003).

8. The oil-cooled axial flux motor structure according to claim 4, characterized in that: The stator support baffle (5), stator support one (6), winding coil (7), stator core tooth portion (9), stator core bottom portion (8) and stator oil passage (4) are symmetrically arranged in the housing (2) with stator support baffle two (12), stator support four (13), winding coil two (14), stator core tooth portion two (15), stator core bottom portion two (16) and stator oil passage two (17); the stator oil passage two (17) is composed of stator annular flow passage two (1701) and stator oil passage outlet two (1702).

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