Double stator motor

Abstract

The present invention provides a dual-stator motor including a rotating shaft, a first driving part and a second driving part arranged side by side on the rotating shaft, the first driving part having a first rotor and a first stator, the second driving part having a second rotor and a second stator, and further including: an air disk sandwiched between the first driving part and the second driving part; a radial air bearing stator, respectively arranged between the first rotor and the first stator and between the second rotor and the second stator; wherein the air disk is connected to the radial air bearing stator. In the present invention, only the radial air bearing stator needs to be arranged to complete the support function of the motor rotor, the air bearing rotor part is omitted, the motor structure is simplified, and in particular, the radial size of the motor can be effectively reduced, thereby reducing the volume of the entire motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a double-stator motor. Background Art

[0002] The drive motor is one of the important technologies in the application field of new energy vehicles such as hybrid vehicles. The drive motor of hybrid vehicles needs to have a wide speed range and an efficient operating area. Ordinary permanent magnet motors have a simple structure and high working efficiency, but due to their constant torque characteristics, it is difficult to meet the requirements of a wide speed range and an efficient operating area, and therefore it is difficult to meet the high performance requirements of motors for hybrid vehicles.

[0003] With the continuous development of motor technology, parallel dual-stator permanent magnet motors have also been well studied and developed, and many dual-stator permanent magnet motors that are easy to start and easy to adjust the speed have appeared. The basic structure of this type of dual-stator permanent magnet motor is: a dual-stator structure is arranged in the casing, and a dual-rotor structure is arranged on the rotating shaft.

[0004] However, the parallel double-stator structure increases the aspect ratio of the shaft due to the side-by-side installation of the stators and the support bearings provided at both ends of the shaft to ensure the stability of the shaft rotation. Under high-speed rotation, the high aspect ratio of the shaft will bring about a series of dynamic problems, such as vibration, balance and stability. In addition, the increase in the length of the shaft will cause the motor to be too large and require high installation space. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the double-stator motor in the prior art that the volume is too large, thereby providing a double-stator motor.

[0006] In order to solve the above problems, the present invention provides a dual-stator motor, including a rotating shaft, a first driving part and a second driving part arranged side by side on the rotating shaft, the first driving part having a first rotor and a first stator, the second driving part having a second rotor and a second stator, and also including: an air disk clamped between the first driving part and the second driving part; a radial air bearing stator, respectively arranged between the first rotor and the first stator and between the second rotor and the second stator; wherein the air disk is connected to the radial air bearing stator.

[0007] Further, the radial air bearing stator is arranged on the inner side surfaces of the first stator and the second stator.

[0008] Furthermore, first annular protrusions are respectively formed on the inner side surfaces of the first stator and the second stator, and the outer peripheral surface of the radial air bearing stator is arranged to fit the top of the first annular protrusion, so that the outer peripheral surface of the radial air bearing stator forms an axial air equalization chamber with one end closed with the inner side surfaces of the first stator and the second stator.

[0009] Further, the first annular protrusion is configured to be disposed away from the gas disk.

[0010] The dual-stator motor in the present invention further comprises a thrust air bearing stator, which is respectively arranged between the first rotor and the air disk and between the second rotor and the air disk, and the air disk is connected to the thrust air bearing stator.

[0011] Furthermore, there are gaps between the inner side surface of the radial air bearing stator and the inner side surface of the thrust air bearing stator and the outer side surface of the first rotor and the outer side surface of the second rotor, respectively, and the gaps are constructed as air film forming chambers.

[0012] Furthermore, the two thrust air bearing stators are symmetrically arranged on two axial end surfaces of the air disk.

[0013] Furthermore, a groove is formed on the axial end surface, and the thrust air bearing stator is embedded in the groove.

[0014] Furthermore, a second annular protrusion is formed on the bottom of the groove, and the outer end surface of the thrust air bearing stator is arranged to fit the top of the second annular protrusion to form a radial air chamber between the outer end surface of the thrust air bearing stator and the axial end surface.

[0015] The air disk in the dual-stator motor of the present invention also includes: a plurality of radial air channels arranged radially along its radial direction; and a first axial air channel and a second axial air channel arranged along its axial direction and connected to the radial air channel; wherein the end of the first axial air channel is connected to the axial equalizing air chamber, and the end of the second axial air channel is connected to the radial equalizing air chamber.

[0016] Furthermore, a plurality of radial air passages are formed at equal intervals on the same circumference.

[0017] The dual-stator motor in the present invention also includes a shell, which is covered on the outer circumferential surface of the first stator and the second stator, and has an air inlet formed at the air inlet end corresponding to the radial air channel, and external gas flows into the radial air channel through the air inlet.

[0018] Furthermore, an annular groove is provided on the inner side of the circumferential surface of the shell along its circumference, and a portion of the circumferential surface of the gas disk provided with the radial air channel abuts against the notch of the annular groove to form a circumferential air equalization chamber.

[0019] The technical solution of the present invention has the following advantages:

[0020] 1. The dual-stator motor in the present invention includes a rotating shaft, a first driving part and a second driving part arranged side by side on the rotating shaft, the first driving part has a first rotor and a first stator, the second driving part has a second rotor and a second stator, and also includes: an air disk, clamped between the first driving part and the second driving part; a radial air bearing stator, respectively arranged between the first rotor and the first stator and between the second rotor and the second stator; wherein the air disk is connected to the radial air bearing stator.

[0021] The present invention is different from the prior art in that the dual-stator motor supports the rotating shaft, and instead supports the motor rotor, i.e., the first rotor and the second rotor mentioned above. On this basis, by improving the surface processing technology of the motor rotor, a part of the motor rotor is directly used as the rotor of the air bearing, so that in the present invention, only a radial air bearing stator is required to support the motor rotor, the air bearing rotor part is omitted, the motor structure is simplified, and especially the radial size can be effectively reduced, thereby reducing the volume of the entire motor.

[0022] 2. The radial air bearing stator in the dual-stator motor of the present invention is arranged on the inner side of the first stator and the second stator. The radial air bearing stator is directly fixed on the inner side of the first stator and the second stator in the present invention, and no additional fixing structure is required, which can further reduce the radial size of the motor.

[0023] 3. In the dual-stator motor of the present invention, the first stator and the second stator are respectively formed with a first annular protrusion on the inner side surface, and the outer peripheral surface of the radial air bearing stator is arranged to fit the top of the first annular protrusion, so that the outer peripheral surface of the radial air bearing stator and the inner side surfaces of the first stator and the second stator form an axial uniform air chamber with one end closed. The axial uniform air chamber allows the gas introduced from the outside to enter the radial air bearing stator more evenly and quickly.

[0024] 4. The first annular protrusion in the dual-stator motor of the present invention is constructed to be set away from the air disk. The first annular protrusion designed in this way can make the axial air equalization chamber cover the outer circumference of the entire radial air bearing stator as much as possible to ensure the air intake efficiency of the radial air bearing stator.

[0025] 5. The dual-stator motor of the present invention also includes a thrust air bearing stator, which is respectively arranged between the first rotor and the air disk and between the second rotor and the air disk, and the air disk is connected to the thrust air bearing stator. In some motors, axial force components are generated when the motors are in load motion, and thrust bearings need to be arranged. In the present invention, the end surface of the motor rotor is processed to be used as the rotor of the thrust air bearing, which reduces the space occupied by the thrust bearing in the axial direction and can reduce the axial size of the motor.

[0026] 6. In the dual-stator motor of the present invention, there are gaps between the inner side surfaces of the radial air bearing stator and the inner side surfaces of the thrust air bearing stator and the outer side surfaces of the first rotor and the second rotor, respectively. The gaps are constructed as air film forming chambers. The high-pressure gas coming out of the radial air bearing stator forms a high-pressure air film in the air film forming chamber to support the first rotor and the second rotor.

[0027] 7. In the dual-stator motor of the present invention, two thrust air bearing stators are symmetrically arranged on the two axial end faces of the air disk, and grooves are formed on the axial end faces. The thrust air bearing stators are embedded in the grooves. Embedding the thrust air bearing stators in the grooves on the air disk reduces the utilization of the axial space of the motor by the thrust air bearing stators, which can further reduce the volume of the motor.

[0028] 8. A second annular protrusion is formed on the bottom of the groove of the double-stator motor of the present invention, and the outer end surface of the thrust air bearing stator is arranged to fit the top of the second annular protrusion, so that a radial uniform air chamber is formed between the outer end surface and the axial end surface of the thrust air bearing stator. The radial uniform air chamber allows the gas introduced from the outside to enter the thrust air bearing stator more evenly and quickly.

[0029] 9. In the dual-stator motor of the present invention, an annular groove is provided on the inner side of the circumference of the housing along its circumference, and the part of the circumference of the gas disk provided with radial air channels abuts against the notch of the annular groove to form a circumferential uniform air chamber. The gas entering from the air inlet first enters the circumferential uniform air chamber, is evenly filled in the circumferential uniform air chamber for pressure equalization, and then enters the radial air channel to ensure the consistency of the gas pressure in each radial air channel, providing a strong guarantee for the operation of the air bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1A full cross-sectional view of a dual-stator motor in an embodiment of the present invention;

[0032] Figure 2 for Figure 1 A partial enlarged view of

[0033] Figure 3 A schematic diagram of the housing structure of a dual-stator motor in an embodiment provided by the present invention;

[0034] Figure 4 A schematic diagram of the gas disk structure of the double-stator motor in the embodiment provided by the present invention;

[0035] Figure 5 An axial cross-sectional view of an air disk of a dual-stator motor in an embodiment provided by the present invention;

[0036] Figure 6 A radial cross-sectional view of an air disk of a dual-stator motor in an embodiment provided by the present invention;

[0037] Figure 7 A schematic diagram of the position of the first annular protrusion in the dual-stator motor in the embodiment provided by the present invention.

[0038] Description of reference numerals:

[0039] 100 - shaft;

[0040] 200 - first driving unit; 201 - first rotor; 202 - first stator;

[0041] 300 - second driving unit; 301 - second rotor; 302 - second stator;

[0042] 400 - gas disc; 401 - axial end face; 402 - groove; 403 - radial gas equalizing chamber; 404 - radial gas channel; 405 - first axial gas channel; 406 - second axial gas channel;

[0043] 500 - radial air bearing stator;

[0044] 600 - thrust air bearing stator;

[0045] 700 - first annular protrusion;

[0046] 800 - axial air chamber;

[0047] 900-Air film forming room;

[0048] 110 - housing; 111 - air inlet; 112 - circumferential air chamber; 113 - annular groove. DETAILED DESCRIPTION

[0049] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0053] Example 1

[0054] like Figures 1 to 7 As shown, a dual-stator motor provided in this embodiment includes a rotating shaft 100, a first driving part 200 and a second driving part 300 arranged side by side on the rotating shaft 100, the first driving part 200 has a first rotor 201 and a first stator 202, the second driving part 300 has a second rotor 301 and a second stator 302, and also includes: an air disk 400, clamped between the first driving part 200 and the second driving part 300; a radial air bearing stator 500, respectively arranged between the first rotor 201 and the first stator 202 and between the second rotor 301 and the second stator 302; wherein the air disk 400 is connected to the radial air bearing stator 500.

[0055] It should also be noted that the motor shaft of the motor in this embodiment is also subjected to axial force when loaded, so this embodiment also includes a thrust air bearing stator 600, which is respectively arranged between the first rotor 201 and the air disk 400 and between the second rotor 301 and the air disk 400, and the air disk 400 is connected to the thrust air bearing stator 600. In this embodiment, the end surface of the motor rotor is processed to be used as the rotor of the thrust air bearing, which reduces the space occupied by the thrust bearing in the axial direction and can reduce the axial size of the motor.

[0056] The dual-stator motor in this embodiment is generally cylindrical. Figure 3 As shown in , it has a cylindrical housing 110, and motor end covers 311 are respectively installed at both ends of the housing 110. The motor end cover 311 is formed with an annular support edge at the corresponding position of the opening of the housing 110 to achieve the positioning and installation of the housing 110. A mounting hole 114 is processed at the end surface of the housing 110, and the motor end cover 311 is screwed to the housing 110.

[0057] In this embodiment, the rotating shaft 100 is connected to the first rotor 201 and the second rotor 301 by interference fit, and rotates together with the first rotor 201 and the second rotor 301 under the action of magnetic force.

[0058] Since air bearings are used in this embodiment, gas needs to be provided from the outside. In this embodiment, an air disk 400 is embedded in the axial middle of the housing 110 .

[0059] The present embodiment is different from the dual-stator motor in the prior art in that it supports the motor rotor instead of the rotating shaft, i.e., the first rotor 201 and the second rotor 301 mentioned above. On this basis, by improving the surface processing technology of the motor rotor, a part of the motor rotor is directly used as the rotor of the air bearing, so that in the present embodiment, only the radial air bearing stator 500 and the thrust air bearing stator 600 are required to support the motor rotor, thereby eliminating the air bearing rotor part and simplifying the motor structure. In particular, the axial and radial dimensions of the motor can be effectively reduced, thereby reducing the volume of the entire motor.

[0060] like Figure 2 As shown, the radial air bearing stator 500 is installed on the inner side surfaces of the first stator 202 and the second stator 302. Specifically, the outer circumferential surface of the radial air bearing stator 500 is in contact with the inner circumferential surface of the first stator 202 and the second stator 302, and the two are fixed by interference fit using a thermal processing process. There is no need to add additional fixing structures, which can further reduce the radial size of the motor.

[0061] Furthermore, if Figure 7As shown, first annular protrusions 700 are respectively formed on the inner side surfaces of the first stator 202 and the second stator 302, and the outer peripheral surface of the radial air bearing stator 500 is arranged to fit the top of the first annular protrusion 700, so that the outer peripheral surface of the radial air bearing stator 500 forms an axial air equalization chamber 800 with the inner side surfaces of the first stator 202 and the second stator 302 respectively. The axial air equalization chamber 800 can allow the gas introduced from the outside to enter the radial air bearing stator 500 more evenly and quickly.

[0062] In this embodiment, the first annular protrusion 700 is constructed to be arranged away from the air disk 400, that is, designed close to the motor end cover 311. The first annular protrusion 700 designed in this way can make the axial air equalizing chamber 800 cover the outer circumference of the entire radial air bearing stator 500 as much as possible to ensure the air intake efficiency of the radial air bearing stator 500.

[0063] Furthermore, a sealant may be applied on the top of the first annular protrusion 700 or on the outer circumferential surface of the radial air bearing stator 500 corresponding to the first annular protrusion 700 to prevent air leakage.

[0064] like Figure 2 As shown, there are gaps between the inner side of the radial air bearing stator 500 and the inner side of the thrust air bearing stator 600 and the outer side of the first rotor 201 and the outer side of the second rotor 301, respectively, and the gaps are configured as air film forming chambers 900. The high-pressure gas from the radial air bearing stator 500 forms a high-pressure air film in the air film forming chamber to achieve a supporting effect on the first rotor 201 and the second rotor 301.

[0065] In order to overcome the axial force of the rotating shaft 100 , two thrust air bearing stators 600 are symmetrically mounted on two axial end surfaces 401 of the air disk 400 .

[0066] In this embodiment, a groove 402 is formed on the axial end surface 401, and the thrust air bearing stator 600 is embedded in the groove 402 in an interference fit manner. The thrust air bearing stator 600 is embedded in the groove 402 on the air disk 400, which reduces the use of the thrust air bearing stator 600 in the axial space of the motor, and can further reduce the volume of the motor.

[0067] In order to supply air to the thrust air bearing stator 600, a second annular protrusion is formed on the bottom of the groove 402, and the outer end surface of the thrust air bearing stator 600 is arranged to fit the top of the second annular protrusion, so that a radial air equalization chamber 403 is formed between the outer end surface of the thrust air bearing stator 600 and the axial end surface 401. The function of the radial air equalization chamber 403 is the same as that of the axial air equalization chamber 800.

[0068] In this embodiment, the groove 402 is cylindrical, and a second annular protrusion is formed at the bottom of the groove near the groove wall toward the groove opening, which has a simple structure and is easy to design.

[0069] As described above, the axial air equalization chamber 800 and the radial air equalization chamber 403 are respectively connected to the external gas, so that the gas forms a high-pressure air mold in the air film forming chamber 900 after passing through the radial air bearing stator 500 and the thrust air bearing stator 600 in this embodiment. The formation of the air mold forming chamber 900 cooperates with the first rotor 201 and the second rotor 301 of the dual-stator motor to replace the stator in the traditional air bearing, so as to reduce the bearing's demand for the internal space of the motor and reduce the volume of the motor.

[0070] The following is a detailed description of the gas disc 400:

[0071] The gas disk 400 is mainly used to introduce gas into the axial gas chamber 800 and the radial gas chamber 403 in this embodiment. Figure 4 The gas disk 400 shown also includes: a plurality of radial air channels 404 arranged radially along the radial direction; and a first axial air channel 405 and a second axial air channel 406 arranged along the axial direction and connected to the radial air channel 404; wherein the end of the first axial air channel 405 is connected to the axial equalizing air chamber 800, and the end of the second axial air channel 406 is connected to the radial equalizing air chamber 403.

[0072] like Figure 6 As shown, a plurality of radial air passages 404 are formed at equal intervals on the same circumference. The uniform radial arrangement of the radial air passages 404 can ensure uniform air intake of the first axial air passage 405 and the second axial air passage 406 .

[0073] In this embodiment, an air inlet 111 is formed on the housing 110 at the air inlet end corresponding to the radial air channel 404 , and external air flows into the radial air channel 404 through the air inlet 111 .

[0074] An annular groove 113 is provided on the inner side of the circumference of the housing 110 along its circumference, and a portion of the circumference of the air disk 4 provided with radial air channels 404 abuts against the notch of the annular groove 113 to form a circumferential uniform air chamber 112. The gas entering from the air inlet 11 first enters the circumferential uniform air chamber 112, is evenly filled in the circumferential uniform air chamber 112 for pressure equalization, and then enters the radial air channels 404 to ensure the consistency of the gas pressure in each radial air channel 404, providing a strong guarantee for the operation of the air bearing.

[0075] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A dual-stator motor, comprising a rotating shaft (100), a first driving part (200) and a second driving part (300) arranged side by side on the rotating shaft (100), wherein the first driving part (200) has a first rotor (201) and a first stator (202), and the second driving part (300) has a second rotor (301) and a second stator (302), characterized in that: include: An air disk (400) is sandwiched between the first driving part (200) and the second driving part (300); Radial air bearing stators (500) are respectively arranged between the first rotor (201) and the first stator (202) and between the second rotor (301) and the second stator (302); Wherein, the air disk (400) is connected to the radial air bearing stator (500); It also includes a thrust air bearing stator (600), which is respectively arranged between the first rotor (201) and the air disk (400) and between the second rotor (301) and the air disk (400), and the air disk (400) is connected to the thrust air bearing stator (600).

2. The dual-stator motor according to claim 1, characterized in that: The radial air bearing stator (500) is arranged on the inner side surfaces of the first stator (202) and the second stator (302).

3. The dual-stator motor according to claim 2, characterized in that: A first annular protrusion (700) is formed on the inner side surfaces of the first stator (202) and the second stator (302), respectively, and the outer peripheral surface of the radial air bearing stator (500) is arranged to fit the top of the first annular protrusion (700), so that the outer peripheral surface of the radial air bearing stator (500) and the inner side surfaces of the first stator (202) and the second stator (302) respectively form an axial air equalization chamber (800) with one end closed.

4. The dual-stator motor according to claim 3, characterized in that: The first annular protrusion (700) is configured to be disposed away from the gas disk (400).

5. The dual-stator motor according to claim 1, characterized in that: There are gaps between the inner side surface of the radial air bearing stator (500) and the inner side surface of the thrust air bearing stator (600) and the outer side surface of the first rotor (201) and the outer side surface of the second rotor (301), respectively, and the gaps are constructed as air film forming chambers (900).

6. The dual-stator motor according to claim 3, characterized in that: The two thrust air bearing stators (600) are symmetrically arranged on two axial end surfaces (401) of the air disk (400).

7. The dual-stator motor according to claim 6, characterized in that: A groove (402) is formed on the axial end surface (401), and the thrust air bearing stator (600) is embedded in the groove (402).

8. The dual-stator motor according to claim 7, characterized in that: A second annular protrusion is formed on the bottom of the groove (402), and the outer end surface of the thrust air bearing stator (600) is arranged to fit the top end of the second annular protrusion, so that a radial air equalization chamber (403) is formed between the outer end surface of the thrust air bearing stator (600) and the axial end surface (401).

9. The dual-stator motor according to claim 8, characterized in that: The gas disk (400) further comprises: A plurality of radial air passages (404) arranged radially along the radial direction; and a first axial air channel (405) and a second axial air channel (406) arranged along the axial direction thereof and connected to the radial air channel (404); The end of the first axial air channel (405) is in communication with the axial air equalization chamber (800), and the end of the second axial air channel (406) is in communication with the radial air equalization chamber (403).

10. The dual-stator motor according to claim 9, characterized in that: A plurality of radial air channels (404) are formed at equal intervals on the same circumference.

11. The dual-stator motor according to claim 9, characterized in that: It also comprises a shell (110) which is arranged on the outer circumferential surface of the first stator (22) and the second stator (32), and has an air inlet (111) formed at the air inlet end corresponding to the radial air channel (404), and external air flows into the radial air channel (404) through the air inlet (111).

12. The dual-stator motor according to claim 11, characterized in that: An annular groove (113) is provided on the inner side of the circumferential surface of the shell (110) along its circumference, and a portion of the circumferential surface of the gas disc (4) provided with the radial air channel (404) abuts against the notch of the annular groove (113) to form a circumferential air equalization chamber (112).

Images