A dual rotor electric machine

Abstract

The application relates to a double-rotor motor which comprises an outer-rotor front end cover, a stator front support, a stator fixing screw, an inner-rotor rotating shaft, an outer-rotor rear end cover, an outer-rotor end cover fixing screw, a stator rear support, an inner rotor, a framework, an outer rotor and a stator core; the stator fixing screw is sequentially threaded through the stator front support, the framework and the stator core from one side of the motor and is locked with the threaded hole of the stator rear support; the outer-rotor end cover fixing screw is sequentially threaded through the outer-rotor rear end cover and the outer-rotor front end cover from the other side of the motor and is fixed; the stator core is provided with an inner stator matched with the inner rotor and an outer stator matched with the outer rotor; and the outer-rotor front end cover and the inner-rotor rotating shaft serve as output ends. Compared with the prior art, the application has the advantages of compact structure, high installation precision, high support strength and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric machine, in particular to a double-rotor electric machine. BACKGROUND

[0002] The existing electric machine is generally composed of a stator and a rotor. Since the electric machine has only one rotor, it can only realize single-speed single-shaft output and has single working mode. Such structure cannot meet special requirements in some occasions where forward and reverse rotation is required and is mutually restricted. Meanwhile, it also has problems of insufficient power density and flexible control. In many industrial fields, the electric machine is required to have double-shaft output capability of providing two independent rotating speeds and independent torques. Obviously, the traditional electric machine structure cannot realize this function.

[0003] As shown in the prior art double-rotor electric machine, Figure 1 the stator is mostly directly locked on the end cover or the shell by screws. Such fixing mode is not reliable and it is difficult to ensure the installation accuracy of the stator. The air gap between the stator and the rotor after installation is prone to change, which results in low control accuracy of the air gap and affects the overall performance of the electric machine. SUMMARY

[0004] The present application aims to overcome the defects of the prior art and provides a double-rotor electric machine with compact structure, high installation accuracy and high support strength.

[0005] The object of the present application can be achieved by the following technical solutions.

[0006] According to one aspect of the present application, a double-rotor electric machine is provided, which comprises an outer rotor front end cover, a stator front support, a stator fixing screw, an inner rotor shaft, an outer rotor rear end cover, an outer rotor end cover fixing screw, a stator rear support, an inner rotor, a framework, an outer rotor and a stator core.

[0007] The stator fixing screw passes through the stator front support, the framework and the stator core in sequence from one side of the electric machine and is locked with the threaded hole of the stator rear support. The outer rotor end cover fixing screw is fixed after passing through the outer rotor rear end cover and the outer rotor front end cover in sequence from the other side of the electric machine. The stator core is provided with an inner stator matched with the inner rotor and an outer stator matched with the outer rotor. The outer rotor front end cover and the inner rotor shaft serve as output ends.

[0008] As a preferred technical solution, the first air gap exists between the inner stator and the inner rotor, and the second air gap exists between the outer stator and the outer rotor.

[0009] As a preferred technical solution, the accuracy of the first air gap and the second air gap reaches 0.005 mm.

[0010] As a preferred technical scheme, the frame is provided with a second stator mounting hole and a shared wire mixing column for mixing wires when winding the inner and outer windings.

[0011] As a preferred technical scheme, the front surface of the stator front support is provided with a counterbore for sinking a stator fixing screw therein and a first mounting surface for cooperating with an inner ring of an outer rotor motor bearing.

[0012] The back surface of the stator front support is provided with a first stator mounting hole, a first mounting end surface for mounting and fixing a stator core, and a first inner stopper, the inner side of the first inner stopper being used for placing an inner rotor motor bearing and the outer side being used for cooperating with an inner surface of an inner stator.

[0013] As a preferred technical scheme, the front surface of the stator rear support is provided with a motor use mounting hole, symmetrically distributed lead-out hole and a second mounting surface for mounting an outer rotor motor bearing.

[0014] The back surface of the stator rear support is provided with a fourth stator mounting hole for locking a stator fixing screw, a second mounting end surface for mounting and fixing a stator core, and a second inner stopper cooperating with an inner diameter of an inner stator.

[0015] As a preferred technical scheme, the outer rotor front end cover is provided with symmetrically distributed first end cover mounting holes and an outer rotor mounting step for positioning and mounting an outer rotor.

[0016] As a preferred technical scheme, the outer rotor rear end cover is provided with symmetrically distributed second end cover mounting holes, and the outer rotor end cover fixing screw is sunk therein when mounted.

[0017] As a preferred technical scheme, the back surface of the stator front support is provided with a first protruding part, which passes through the frame and contacts one side of the stator core.

[0018] The stator rear support is provided with a second protruding part, which passes through the other side of the frame and contacts the other side of the stator core.

[0019] As a preferred technical scheme, the stator front support and the stator rear support are both provided with protruding parts and mounting end surfaces for enhancing the support strength of the stator core mounting and fixing.

[0020] Compared with the prior art, in the motor structure of the application, a stator and two rotors are included; wherein the stator includes an inner stator and an outer stator, the inner rotor and the inner stator form an inner rotor motor, and the rotation speed and torque are output through the rotation shaft; the outer rotor and the outer stator form an outer rotor motor, and the rotation speed and torque are output through the outer rotor end cover. The stator core is provided with a mounting hole between the inner stator and the outer stator, and the fixing screw passes through the stator front support, the stator core and the stator rear support in sequence, and through the inner stop structure and the mounting end face on the front and rear supports, the stator core can be firmly fixed between the front and rear supports, the use of other excess components is avoided, the size and structure of the motor as a whole become more compact, and the installation precision and support strength of the stator are improved, thereby improving the precision of the motor air gap. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the prior motor;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of embodiment 1 of the application;

[0023] Figure 3 It is another perspective three-dimensional structural schematic diagram of embodiment 1 of the application;

[0024] Figure 4 It is a front view structural schematic diagram of embodiment 1 of the application;

[0025] Figure 5 It is a side view structural schematic diagram of embodiment 1 of the application;

[0026] Figure 6 It is a rear view structural schematic diagram of embodiment 1 of the application;

[0027] Figure 7 It is an explosion structural schematic diagram of embodiment 1 of the application;

[0028] Figure 8 It is a sectional view structural schematic diagram of embodiment 1 of the application;

[0029] Figure 9 It is a three-dimensional structural schematic diagram of the stator core of embodiment 1 of the application;

[0030] Figure 10 It is a front view structural schematic diagram of the stator core of embodiment 1 of the application;

[0031] Figure 11 It is a structural schematic diagram of the stator core and the inner and outer rotors of embodiment 1 of the application after assembly;

[0032] Figure 12 It is a three-dimensional structural schematic diagram of the framework of embodiment 1 of the application;

[0033] Figure 13It is the main view structure schematic diagram of the skeleton of embodiment 1 of the application;

[0034] Figure 14 It is the one side three-dimensional structure schematic diagram of the stator front support of embodiment 1 of the application;

[0035] Figure 15 It is the one side main view structure schematic diagram of the stator front support of embodiment 1 of the application;

[0036] Figure 16 It is the other side three-dimensional structure schematic diagram of the stator front support of embodiment 1 of the application;

[0037] Figure 17 It is the other side main view structure schematic diagram of the stator front support of embodiment 1 of the application;

[0038] Figure 18 It is the one side three-dimensional structure schematic diagram of the stator rear support of embodiment 1 of the application;

[0039] Figure 19 It is the one side main view structure schematic diagram of the stator rear support of embodiment 1 of the application;

[0040] Figure 20 It is the other side three-dimensional structure schematic diagram of the stator rear support of embodiment 1 of the application;

[0041] Figure 21 It is the other side main view structure schematic diagram of the stator rear support of embodiment 1 of the application;

[0042] Figure 22 It is the stator installation structure schematic diagram of embodiment 1 of the application;

[0043] Figure 23 It is the one side three-dimensional structure schematic diagram of the outer rotor front end cover of embodiment 1 of the application;

[0044] Figure 24 It is the one side main view structure schematic diagram of the outer rotor front end cover of embodiment 1 of the application;

[0045] Figure 25 It is the other side three-dimensional structure schematic diagram of the outer rotor front end cover of embodiment 1 of the application;

[0046] Figure 26 It is the other side main view structure schematic diagram of the outer rotor front end cover of embodiment 1 of the application;

[0047] Figure 27 It is the one side three-dimensional structure schematic diagram of the outer rotor rear end cover of embodiment 1 of the application;

[0048] Figure 28 It is the one side main view structure schematic diagram of the outer rotor rear end cover of embodiment 1 of the application;

[0049] Figure 29 This is a three-dimensional structural diagram of the other side of the outer rotor rear end cover of Embodiment 1 of the present invention;

[0050] Figure 30 This is a schematic diagram of the other side of the external rotor rear end cover of Embodiment 1 of the present invention;

[0051] Figure 31 This is a three-dimensional structural diagram of the stator front support of Embodiment 2 of the present invention;

[0052] Figure 32 This is a schematic diagram of the front support structure of the stator in Embodiment 2 of the present invention;

[0053] Figure 33 This is a three-dimensional structural diagram of the stator rear support of Embodiment 2 of the present invention;

[0054] Figure 34 This is a schematic diagram of the main structure of the stator rear support in Embodiment 2 of the present invention;

[0055] Figure 35 This is a three-dimensional structural diagram of the stator mounting according to Embodiment 2 of the present invention;

[0056] Figure 36 This is a schematic cross-sectional view of the stator mounting structure in Embodiment 2 of the present invention;

[0057] Figure 37 This is a three-dimensional structural diagram of the stator mounting according to Embodiment 3 of the present invention;

[0058] Figure 38 This is a schematic cross-sectional view of the stator mounting structure in Embodiment 3 of the present invention;

[0059] 1 is a dual-rotor motor, 2 is the outer rotor front end cover, 3 is the stator front bracket, 4 is the stator fixing screw, 5 is the inner rotor shaft, 6 is the outer rotor rear end cover, 7 is the outer rotor end cover fixing screw, 8 is the stator rear bracket, 9 is the outer rotor motor bearing, 10 is the inner rotor motor bearing, 11 is the inner rotor motor bushing, 12 is the inner rotor, 13 is the inner rotor motor corrugated washer, 14 is the frame, 15 is the outer rotor, 16 is the stator core, 17 is the outer rotor motor corrugated washer, 18 is the inner stator, 19 is the outer stator, 20 is the third stator mounting hole, and 21 is... 22 is the first air gap, 23 is the second air gap, 24 is the common mixing column, 25 is the second stator mounting hole, 26 is the countersunk hole, 27 is the first stator mounting hole, 28 is the first mounting end face, 29 is the first inner stop, 30 is the motor mounting hole, 31 is the lead wire hole, 32 is the second mounting surface, 33 is the second mounting end face, 34 is the fourth stator mounting hole, 35 is the second inner stop, 36 is the first end cover mounting hole, 37 is the outer rotor mounting step, 38 is the second end cover mounting hole, 39 is the first protrusion, and 40 is the second protrusion. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present application.

[0061] As shown in Figures 2-30 , a double-rotor motor includes an outer rotor front end cover 2, a stator front support 3, a stator fixing screw 4, an inner rotor shaft 5, an outer rotor rear end cover 6, an outer rotor end cover fixing screw 7, a stator rear support 8, an inner rotor 12, a skeleton 14, an outer rotor 15 and a stator core 16. The stator fixing screw 4 passes through the stator front support 3, the skeleton 14 and the stator core 16 in sequence from one side of the motor, and is locked with the threaded hole of the stator rear support 8. The stator core 16 is provided with an inner stator 18 matched with the inner rotor 12 and an outer stator 19 matched with the outer rotor 15. The outer rotor front end cover 2 and the inner rotor shaft 5 serve as output ends. The outer rotor end cover fixing screw 7 passes through the outer rotor rear end cover 6 and the outer rotor front end cover 2 in sequence from the other side of the motor, and is fixed. When the motor operates, the outer rotor rear end cover 6 rotates simultaneously with the outer rotor front end cover 2.

[0062] As shown in Figure 7 and 8 , the stator fixing screw 4 passes through the first stator mounting hole 27 of the stator front support 3, the second stator mounting hole 24 of the skeleton, the third stator mounting hole 20 of the stator core and the fourth stator mounting hole 34 of the stator rear support 8 in sequence from the front of the motor, and connects and fixes the stator core 16, the skeleton 14, the stator front support 3 and the stator rear support 8. The outer rotor end cover fixing screw 7 passes through the end cover mounting hole 38 of the outer rotor rear end cover 6 and the end cover mounting hole 36 of the outer rotor front end cover 2 in sequence from the back of the motor, and connects and fixes the outer rotor rear end cover 6 and the outer rotor front end cover 2.

[0063] As shown in Figures 9-11 , the inner stator 18, the outer stator 19 and the third stator mounting hole 20 exist on the stator core 16. The inner stator winding (not shown in the figure) exists on the inner stator 18. The outer stator winding (not shown in the figure) exists on the outer stator 19. The first air gap 21 exists between the inner stator 18 and the inner rotor 12. The second air gap 22 exists between the outer stator 19 and the outer rotor 15. The inner surface of the inner stator and the outer surface of the outer stator are further processed, so that the precision of the air gap can reach 0.005 mm.

[0064] As shown in Figure 12 and 13 , the inner stator 18, the outer stator 19 and the third stator mounting hole 20 exist on the stator core 16. The inner stator winding (not shown in the figure) exists on the inner stator 18. The outer stator winding (not shown in the figure) exists on the outer stator 19. The first air gap 21 exists between the inner stator 18 and the inner rotor 12. The second air gap 22 exists between the outer stator 19 and the outer rotor 15. The inner surface of the inner stator and the outer surface of the outer stator are further processed, so that the precision of the air gap can reach 0.005 mm.As shown, the frame 14 is provided with a second stator mounting hole 24 and a common winding post 23 for winding the inner and outer windings. The second stator mounting hole 24 has a protruding part for separating the inner and outer windings. The protruding part can separate the inner and outer windings and prevent the inner and outer windings from intersecting during winding.

[0065] like Figures 14-17 As shown, there is a countersunk hole 25 on the front side of the stator front bracket 3, into which the stator fixing screw 4 is recessed to prevent it from being exposed, thereby reducing the axial dimension of the motor; there is a first mounting surface 26 that mates with the inner ring of the outer rotor motor bearing 9; there is a through first stator mounting hole 27 on the back side of the stator front bracket 3; there is a stator first mounting end face 28 and a first inner stop 29, the inner side of the inner stop is used to place the inner rotor motor bearing 10, and the outer side of the inner stop is used to mate with the inner surface of the inner stator 18. This surface mating can be a small interference fit, which serves as a positioning function. The first mounting end face 28 provides support for the installation and fixing of the stator core.

[0066] like Figures 18-21 As shown, on the front side of the stator rear support 8, there are motor mounting holes 30 for installing the motor, symmetrically distributed through-holes 31 for the lead wires of the inner and outer windings, and a second mounting surface 32 for mounting the inner ring of the outer rotor motor bearing 9; on the back side of the stator rear support 8, there is a fourth stator mounting hole 34 of a certain depth, which is a threaded hole for locking the stator fixing screw 4; there is a second mounting end face 33 and a second inner stop 35 for installing and fixing the other side of the stator core.

[0067] like Figures 23-26 As shown, the outer rotor front end cover 2 is provided with symmetrically distributed first end cover mounting holes 36 and outer rotor mounting steps 37 for positioning and mounting the outer rotor. The first end cover mounting holes 36 are located on the wall of the outer rotor front end cover 2.

[0068] like Figures 27-30 As shown, the outer rotor rear end cover 6 is provided with symmetrically distributed second end cover mounting holes 38. When the outer rotor end cover fixing screw 7 is installed, it is sunk into the holes to avoid the screws being exposed. The second end cover mounting holes 38 are countersunk holes located on the wall of the rear end cover 6.

[0069] Example 2

[0070] like Figures 32-36As shown, the stator front support 3 has a first protrusion 39 on its back side. This first protrusion 39 passes through the frame 14 and contacts one side of the stator core 16, providing support for the stator core. The stator rear support 8 has a second protrusion 40. This second protrusion 40 passes through the other side of the frame 14 and contacts the other side of the stator core 16, providing support for the stator core. The rest is the same as in Embodiment 1.

[0071] Example 3

[0072] like Figures 37-38 As shown, both the stator front bracket 3 and the stator rear bracket 8 are provided with protrusions and mounting end faces to enhance the support strength for the installation and fixation of the stator core 16. The rest is the same as in Embodiment 1.

[0073] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A dual rotor electric machine characterized by, The motor comprises an outer rotor front end cover (2), a stator front support (3), a stator fixing screw (4), an inner rotor rotating shaft (5), an outer rotor rear end cover (6), an outer rotor end cover fixing screw (7), a stator rear support (8), an inner rotor (12), a framework (14), an outer rotor (15) and a stator core (16); The stator fixing screw (4) is locked with the threaded hole of the stator rear support (8) after passing through the stator front support (3), the framework (14) and the stator core (16) in sequence from one side of the motor, the outer rotor end cover fixing screw (7) is fixed after passing through the outer rotor rear end cover (6) and the outer rotor front end cover (2) in sequence from the other side of the motor, the stator core (16) is provided with an inner stator (18) matched with the inner rotor (12) and an outer stator (19) matched with the outer rotor (15), and the outer rotor front end cover (2) and the inner rotor rotating shaft (5) serve as output ends; The front surface of the stator front support (3) is provided with a counterbore (25) for the stator fixing screw (4) to sink into and a first mounting surface (26) for matching with the inner ring of the outer rotor motor bearing (9); the back surface of the stator front support (3) is provided with a first stator mounting hole (27), a first mounting end surface (28) for mounting and fixing the stator core (16) and a first inner stop (29), the inner side of the first inner stop (29) is arranged with the inner rotor motor bearing (10), and the outer side is matched with the inner diameter of the inner stator (18); The front surface of the stator rear support (8) is provided with a motor use mounting hole (30), symmetrically distributed lead-out hole (31) and a second mounting surface (32) for mounting the outer rotor motor bearing (9); the back surface of the stator rear support (8) is provided with a fourth stator mounting hole (34) for locking the stator fixing screw (4), a second mounting end surface (33) for mounting and fixing the stator core (16) and a second inner stop (35), the second inner stop (35) is matched with the inner diameter of the inner stator (18).

2. A dual rotor electric machine according to claim 1, characterized in that The first air gap (21) exists between the inner stator (18) and the inner rotor (12), and the second air gap (22) exists between the outer stator (19) and the outer rotor (15).

3. A dual rotor electric machine according to claim 2, characterized in that The precision of the first air gap (21) and the second air gap (22) reaches 0.005 mm.

4. A dual rotor electric machine according to claim 1, characterized in that The framework (14) is provided with a second stator mounting hole (24) and a shared wire mixing column (23) for mixing wires when winding the inner and outer windings, and the second stator mounting hole (24) is provided with a protruding part for separating the inner and outer windings.

5. A double rotor electric machine according to claim 1, characterized in that The outer rotor front end cover (2) is provided with symmetrically distributed first end cover mounting holes (36) and an outer rotor mounting step (37) for positioning and mounting the outer rotor.

6. A double rotor electric machine according to claim 1, characterized in that The outer rotor rear end cover (6) is provided with symmetrically distributed second end cover mounting holes (38), and the outer rotor end cover fixing screw (7) is sunk into the second end cover mounting holes (38) when being mounted.

7. A double rotor electric machine according to claim 1, characterized in that The back surface of the stator front support (3) is provided with a first protruding part (39), and the first protruding part (39) is in contact with one side of the stator core (16) after passing through the framework (14). The stator rear support (8) is provided with a second protruding part (40) which passes through the other side skeleton (14) and contacts the other side of the stator core (16).

8. A double rotor electric machine according to claim 1, characterized in that The stator front support (3) and the stator rear support (8) are both provided with protruding parts and mounting end faces for enhancing the support strength of the stator core (16) during mounting and fixing.

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