Axial flux motor with balanced axial force
By employing a balancing structure in the axial flux motor and utilizing a support ring to balance the axial magnetic attraction of the bearing, the problem of bearing damage caused by excessive axial magnetic pull between the stator and rotor is solved, thereby improving bearing life and motor stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN DMT INTELLIGENT EQUIPMENT TECHNOLOGY CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-05-01
AI Technical Summary
In existing axial flux motors, excessive axial magnetic pull between the stator and rotor can easily damage the bearings, affecting the reliability and lifespan of the motor.
An axial force balancing structure is adopted. By setting a first rotor and a second rotor on both sides of the stator respectively, and setting a support ring between the first bearing and the second bearing, the air gap between the first rotor and the stator and between the second rotor and the stator are the same. The support ring is used to balance the axial magnetic attraction force of the bearing, thereby avoiding bearing wear.
This achieves bearing balance, avoids wear, improves bearing life, ensures motor stability and reliability, and maintains air gap consistency between the stator and rotor.
Smart Images
Figure CN224191743U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motors, and more particularly to an axial flux motor with axial force balance. Background Technology
[0002] Axial flux motors, also known as axial magnetic field motors, disc motors, or circular motors, have an axial magnetic flux direction and a radially placed current-carrying system. The stator and rotor cores are disc-shaped. Axial flux motors employ a "sandwich" structure, meaning a rotor is placed between two stators or a stator is placed between two rotors. The axial magnetic pull between the stator and rotor is very large, causing the bearings to be subjected to eccentric loads, which can easily lead to bearing damage. Utility Model Content
[0003] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes an axial flux motor with axial force balance, which is easy to assemble and keeps the axial magnetic attraction between the stator and the rotor balanced to avoid damage to the bearing installed between the stator and the rotor due to off-center load.
[0004] This utility model proposes an axial flux motor with axial force balance, comprising: a housing 1; a stator 2 fixed inside the housing 1; a first rotor 5 and a second rotor 7 respectively disposed on two opposite sides of the stator 2; a first connecting plate 6 connected to the middle of the first rotor 5, which has an output shaft 61; a second connecting plate 8 connected to the middle of the second rotor 7, the second connecting plate 8 being fixedly connected to the output shaft 61 by a fixing member 91; a first bearing 41 is provided between the first connecting plate 6 and the stator 2, and a second bearing 42 is provided between the second connecting plate 8 and the stator 2; air gaps 99 of the same size are provided between the first rotor 5 and the stator 2, and between the second rotor 7 and the stator 2; a support ring 43 is provided between the first bearing 41 and the second bearing 42, and the first bearing 41, the second bearing 42, and the support ring 43 are all coaxially arranged with the shaft hole 22 of the stator 2.
[0005] In some preferred embodiments, bushings 23 extend from both opposite sides of the stator 2 and are coaxially arranged with the shaft hole 22, and the inner diameter of the bushings 23 is larger than the inner diameter of the shaft hole 22; the first bearing 41 and the second bearing 42 are respectively limited in the bushings 23 on both opposite sides of the stator 2.
[0006] In some preferred embodiments, the support ring 43 is located inside the shaft hole 22, and the two opposite ends of the support ring 43 abut against the first bearing 41 and the second bearing 42, respectively.
[0007] In some preferred embodiments, the first end of the output shaft 61 is disposed through the shaft hole 22, and the first bearing 41, the second bearing 42 and the support ring 43 are all sleeved on the first end of the output shaft 61.
[0008] In some preferred embodiments, the first connecting plate 6 has a first abutting ring 62 that abuts against the first bearing 41, and the second connecting plate 8 has a second abutting ring 81 that abuts against the second bearing 42. The first abutting ring 62 and the second abutting ring 81 are coaxial and have the same inner diameter.
[0009] In some preferred embodiments, the support ring 43 is provided with a third abutting ring 431 and a fourth abutting ring 432. The third abutting ring 431 abuts against the first bearing 41, and the fourth abutting ring 432 abuts against the second bearing 42. The first abutting ring 62, the second abutting ring 81, the third abutting ring 431 and the fourth abutting ring 432 are coaxial and have the same inner diameter.
[0010] In some preferred embodiments, the housing 1 is provided with a cable outlet 11, and the terminal 21 of the stator 2 extends to the cable outlet 11.
[0011] In some preferred embodiments, the axial flux motor further includes a pressure plate 3 that is assembled and connected to the housing 1, and the pressure plate 3 presses and fixes the periphery of the stator 2 to the housing 1.
[0012] In some preferred embodiments, the pressure plate 3 is annular, and the inner diameter of the pressure plate 3 is larger than the outer diameter of the first rotor 5 or the second rotor 7.
[0013] In some preferred embodiments, the first rotor 5 has a first annular groove 51 with a central hole in the middle, the first connecting plate 6 is limited and assembled in the first annular groove 51, and the second end of the output shaft 61 extends out of the central hole of the first annular groove 51.
[0014] In some preferred embodiments, the second rotor 7 has a second annular groove 71 with a central hole in the middle, and the second connecting plate 8 is limited and assembled in the second annular groove 71.
[0015] Compared with the prior art, the present invention has the following beneficial effects:
[0016] The axial flux motor disclosed in this utility model has a compact structure and is easy to assemble. The first rotor and the second rotor are symmetrically assembled on opposite sides of the stator via the first bearing and the second bearing, respectively. A support ring is provided between the first bearing and the second bearing to balance the axial magnetic attraction force on the first bearing and the second bearing (i.e., the resultant force is 0). This not only protects the first bearing and the second bearing from wear, which helps to improve the service life of the first bearing and the second bearing and ensure the working reliability of the axial flux motor, but also ensures that the air gap between the first rotor and the stator and between the second rotor and the stator is maintained at the same size during use, which helps to maintain the stable and reliable performance of the axial flux motor. Attached Figure Description
[0017] Figure 1 This is an exploded structural diagram of an axial flux motor.
[0018] Figure 2 This is one of the three-dimensional structural diagrams of the stator assembled inside the housing.
[0019] Figure 3 This is the second schematic diagram of the three-dimensional structure of the stator assembled inside the housing.
[0020] Figure 4 This is a three-dimensional structural diagram of an axial flux motor.
[0021] Figure 5 This is a partial cross-sectional view of an axial flux motor.
[0022] The meanings of the labels in the diagram are as follows: 1-Outer casing, 11-Cable outlet, 12-Through groove, 2-Stator, 21-Terminal, 22-Shaft hole, 23-Shaft sleeve, 3-Pressure plate, 41-First bearing, 42-Second bearing, 43-Support ring, 431-Third abutment ring, 432-Fourth abutment ring, 5-First rotor, 51-First annular groove, 6-First connecting plate, 61-Output shaft, 62-First abutment ring, 7-Second rotor, 71-Second annular groove, 8-Second connecting plate, 81-Second abutment ring, 91-Fixing component, 92-First screw, 93-Second screw, 94-Third screw, 99-Air gap. Detailed Implementation
[0023] To further illustrate the technical means and effects adopted by this application to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.
[0024] Combination Figures 1-5 As shown, this utility model discloses an axial flux motor with axial force balance, comprising: a housing 1; a stator 2 fixed inside the housing 1; a first rotor 5 and a second rotor 7 respectively disposed on two opposite sides of the stator 2; a first connecting plate 6 connected to the middle of the first rotor 5, which has an output shaft 61; and a second connecting plate 8 connected to the middle of the second rotor 7. The second connecting plate 8 is fixedly connected to the output shaft 61 by a fixing member 91, thereby enabling the first rotor 5 and the second rotor 7 to be coaxially fixedly assembled on the two opposite sides of the stator 2.
[0025] In addition, a first bearing 41 is provided between the first connecting plate 6 and the stator 2. The two axial ends of the first bearing 41 abut against the first connecting plate 6 and the stator 2 respectively. The first rotor 5 rotates relative to the stator 2 based on the first bearing 41. A second bearing 42 is provided between the second connecting plate 8 and the stator 2. The two axial ends of the second bearing 42 abut against the second connecting plate 8 and the stator 2 respectively. The second rotor 7 rotates relative to the stator using the second bearing 42.
[0026] The first bearing 41 and the second bearing 42 are bearings with the same axial dimension, thereby enabling the first bearing 41 and the second bearing 42 to have the same size air gap 99 between the first rotor 5 and the stator 2 and between the second rotor 7 and the stator 2.
[0027] Furthermore, a support ring 43 is provided between the first bearing 41 and the second bearing 42. The first bearing 41, the second bearing 42, and the support ring 43 are all coaxially arranged with the shaft hole 22 of the stator 2, that is, the two axial ends of the support ring 43 abut against the first bearing 41 and the second bearing 42 respectively.
[0028] The magnetic attraction force on the first rotor 5 is transmitted from the first direction through the first connecting plate 6 and the first bearing 41 to the support ring 43, where the support ring 43 is subjected to a force F1 from the first bearing 41. Similarly, the second magnetic attraction force on the second rotor 7 is transmitted from the second direction through the second connecting plate 8 and the second bearing 42 to the support ring 43, where the support ring 43 is subjected to a force F2 from the second bearing 42. Since the forces F1 and F2 are equal in magnitude and opposite in direction, the resultant force on the support ring 43 is 0. This avoids wear on the first bearing 41 and the second bearing 42 due to unidirectional magnetic attraction. It also helps ensure that the air gap 99 between the first rotor 5 and the stator 2, and between the second rotor 7 and the stator 2, is maintained at the same size during use using the first bearing 41 and the second bearing 42, respectively. This avoids the large axial magnetic force between the stator and the rotor affecting the size of the air gap between the rotor and the stator, thus helping the axial flux motor maintain reliable performance.
[0029] Furthermore, the first rotor 5 and the second rotor 7 are coaxially fixedly assembled on two opposite sides of the stator 2, which has good axial symmetry. This greatly reduces the axial magnetic pull force generated by the first rotor 5 and the second rotor 7 on the stator 2, resulting in better motor stability.
[0030] Meanwhile, by having the two ends of the support ring 43 abut against the first bearing 41 and the second bearing 42, the force between the first bearing 41 and the second bearing 42 is efficiently transmitted; under the synergistic effect of the support ring 43, the axial magnetic attraction force on each bearing is 0, which avoids wear during operation and helps to improve the bearing life.
[0031] In some preferred embodiments, the first connecting plate 6 has a first abutting ring 62 that abuts against the first bearing 41, and the second connecting plate 8 has a second abutting ring 81 that abuts against the second bearing 42. The first abutting ring 62 and the second abutting ring 81 are coaxial and have the same inner diameter.
[0032] In some preferred embodiments, a third abutment ring 431 and a fourth abutment ring 432 are provided on two opposite sides of the support ring 43. The third abutment ring 431 abuts against the first bearing 41, and the fourth abutment ring 432 abuts against the second bearing 42. The first abutment ring 431, the second abutment ring 431, the third abutment ring 431, and the fourth abutment ring 432 are coaxial and have the same inner diameter.
[0033] By setting the first abutment ring 62, the lever arm distance of the first connecting plate 6 acting on the first bearing 41 is greatly increased. Since the magnitude of the magnetic force on the first connecting plate 6 and the lever arm are fixed, setting the first abutment ring 62 moves the point of action between the first connecting plate 6 and the first bearing 41 away from the axis. Therefore, it can be understood that the lever arm between the first connecting plate 6 and the first bearing 42 is increased by the first abutment ring 62. Thus, the force exerted by the first connecting plate 6 on the first bearing 41 through the first abutment ring 62 is reduced due to the increased lever arm, greatly reducing bearing wear and extending bearing life. The interaction between the second abutment ring 81, the third abutment ring 431, and the fourth abutment ring 432 is similar to that of the first abutment ring 62 and will not be elaborated further.
[0034] Among them, the stator 2 has bushings 23 extending from both opposite sides, which are coaxially arranged with the shaft hole 22, and the inner diameter of the bushing 23 is larger than the inner diameter of the shaft hole 22; the first bearing 41 and the second bearing 42 are respectively limited in the bushings 23 on both opposite sides of the stator 2.
[0035] See Figure 5 As shown, the support ring 43 is located inside the shaft hole 22. The two opposite ends of the support ring 43 abut against the axial center regions of the first bearing 41 and the second bearing 42, respectively. The support ring 43 is used to transmit force between the first bearing 41 and the second bearing 42, so that the axial magnetic attraction force on the first bearing 41 and the second bearing 42 is 0. At the same time, the two opposite sides of the peripheral portion of the shaft hole 22 abut against the circumferential regions of the first bearing 41 and the second bearing 42 away from the axis, respectively. This not only provides a limit for the assembly of the first bearing 41 and the second bearing 42, but also facilitates the transmission of force between the first bearing 41 and the second bearing 42 to ensure that the axial magnetic attraction force on the first bearing 41 and the second bearing 42 is 0. This avoids the first bearing 41 and the second bearing 42 from being subjected to off-center loads with non-zero magnetic attraction forces during use, which would cause wear or damage. This helps to improve the service life of the first bearing 41 and the second bearing 42 and ensure the working reliability of the axial flux motor.
[0036] The axial flux motor also includes a pressure plate 3 that is assembled and connected to the housing 1, and the pressure plate 3 presses and fixes the periphery of the stator 2 to the housing 1.
[0037] Specifically, both the housing 1 and the pressure plate 3 are annular. The size of the housing 1 is larger than that of the pressure plate 3, and the inner diameter of the pressure plate 3 is larger than the outer diameter of the first rotor 5 or the second rotor 7. Multiple second screws 93 are threaded through the pressure plate 3 and the stator 1 in sequence and then connected to the housing 1, thereby using the pressure plate 3 to press and fix the periphery of the stator 2 to the housing 1.
[0038] To facilitate the wiring of the stator 2, a wire outlet 11 is provided in the housing 1, and the wiring terminals 21 of the stator 2 extend to the wire outlet 11.
[0039] For ease of assembly, the first end of the output shaft 61 is arranged to pass through the shaft hole 22, and the first bearing 41, the second bearing 42 and the support ring 43 are all sleeved on the first end of the output shaft 61.
[0040] The first rotor 5 has a first annular groove 51 with a central hole in its middle part. The first connecting plate 6 is fitted into the first annular groove 51 for limiting, and the second end of the output shaft 61 extends out of the central hole of the first annular groove 51, so that the second end of the output shaft 61 serves as the power output end of the axial flux motor, which facilitates connection to the driven device by extending the second end of the output shaft 61 when the axial flux motor is used as a power source. The first connecting plate 6 and the first annular groove 51 are usually fixed together by the first screw 92.
[0041] The second rotor 7 has a second annular groove 71 with a central hole in its middle part, and the second connecting plate 8 is fitted into the second annular groove 71 for limiting. The second connecting plate 8 and the second annular groove 71 can usually be fixed together by the second screw 93.
[0042] In addition, the axial flux motor of this invention has the characteristics of reasonable installation structure and easy assembly. A typical assembly operation process is as follows:
[0043] First, place the stator 2 into the housing 1, press the periphery of the stator 2 onto the housing 1 using the pressure plate 3, and fix the stator 2 to the housing 1 by passing through the pressure plate 3 and the third screw 94.
[0044] Next, the first connecting plate 6 is fixedly assembled with the first rotor 5 using the first screw 92. Then, the first bearing 41, stator 2, support ring 43, and second bearing 42 are sequentially sleeved on the first end of the output shaft 61, so that the first bearing 41 and the second bearing 42 are respectively limited in the bushings 23 on the two opposite sides of the stator 2, while the support ring 43 is located in the shaft hole 22 of the stator 2, and the support ring 43 is located between the first bearing 41 and the second bearing 42.
[0045] Finally, the second connecting plate 7 is fixedly assembled with the second rotor 8 using the second screw 93, and then the first connecting plate 7 is coaxially fixedly connected with the first end of the output shaft 61 using the fastener 91 to complete the motor assembly.
[0046] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An axially force-balanced axial flux motor, comprising: Housing (1); stator (2) fixed inside housing (1); first rotor (5) and second rotor (7) respectively disposed on two opposite sides of stator (2); first connecting plate (6) connected to first rotor (5) having output shaft (61); second connecting plate (8) connected to second rotor (7) and fixedly connected to output shaft (61); characterized in that: A first bearing (41) is provided between the first connecting plate (6) and the stator (2), and a second bearing (42) is provided between the second connecting plate (8) and the stator (2). An air gap (99) is formed between the first rotor (5) and the stator (2) and between the second rotor (7) and the stator (2). A support ring (43) is provided between the first bearing (41) and the second bearing (42). The first bearing (41), the second bearing (42), and the support ring (43) are all coaxially arranged with the shaft hole (22) of the stator (2).
2. An axial flux machine according to claim 1, characterised in that: Both sides of the stator (2) extend bushings (23) that are coaxially arranged with the shaft hole (22), and the inner diameter of the bushings (23) is larger than the inner diameter of the shaft hole (22); the first bearing (41) and the second bearing (42) are respectively limited in the bushings (23) on both sides of the stator (2).
3. The axial flux machine of claim 1, wherein: The support ring (43) is located inside the shaft hole (22), and the two opposite ends of the support ring (43) abut against the first bearing (41) and the second bearing (42) respectively.
4. The axial flux machine of claim 1, wherein: The first end of the output shaft (61) is set through the shaft hole (22), and the first bearing (41), the second bearing (42) and the support ring (43) are all sleeved on the first end of the output shaft (61).
5. The axial flux machine of claim 1, wherein: The first connecting plate (6) has a first abutting ring (62) that abuts against the first bearing (41), and the second connecting plate (8) has a second abutting ring (81) that abuts against the second bearing (42). The first abutting ring (62) and the second abutting ring (81) are coaxial and have the same inner diameter.
6. The axial flux motor according to claim 5, characterized in that: The support ring (43) is provided with a third abutting ring (431) and a fourth abutting ring (432). The third abutting ring (431) abuts against the first bearing (41), and the fourth abutting ring (432) abuts against the second bearing (42). The first abutting ring (62), the second abutting ring (81), the third abutting ring (431) and the fourth abutting ring (432) are coaxial and have the same inner diameter.
7. The axial flux machine of claim 1, wherein: It also includes a pressure plate (3) that is assembled and connected to the housing (1), which presses and fixes the periphery of the stator (2) to the housing (1).
8. The axial flux motor according to claim 7, characterized in that: The pressure plate (3) is in the shape of a ring, and the inner diameter of the pressure plate (3) is larger than the outer diameter of the first rotor (5) or the second rotor (7).
9. The axial flux motor according to claim 1, characterized in that: The first rotor (5) has a first annular groove (51) with a central hole in the middle, and the first connecting plate (6) is limited and assembled in the first annular groove (51).
10. The axial flux motor according to claim 1, characterized in that: The second rotor (7) has a second annular groove (71) with a central hole in the middle, and the second connecting plate (8) is limited and assembled in the second annular groove (71).