Double-rotor direct drive motor

Abstract

The utility model belongs to the technical field of motors, and discloses a double-rotor direct-drive motor, which comprises a shell, an output shaft and a stator mounted on the shell, the output shaft is mounted in the axial center of the shell, an upper rotor and a lower rotor are mounted on rotating shafts on two sides of the stator in a mirror symmetry manner and rotate along with the output shaft, the upper rotor comprises a first magnetic part, and the lower rotor comprises a second magnetic part. The lower rotor comprises a second magnetic part, the first magnetic part and the second magnetic part are oppositely arranged, and when the upper rotor and the lower rotor rotate, the magnetic poles of the first magnetic part and the second magnetic part are the same; due to the fact that when the magnetic poles of the magnetic parts on the two rotors are the same, repulsive force can be generated, vibration and noise caused by unbalanced magnetic force are reduced, the motor is of an upper and lower rotor structure, the magnetic poles of the magnets are oppositely installed, and the design structure can generate rotating torque. And the magnetic part interacts with the magnetic part on the rotor to generate attraction and repulsive force to push the rotor to rotate, so that the torque of the motor is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a dual-rotor direct-drive motor. Background Art

[0002] In modern industry, with the increasing demands for motion control precision, speed, and efficiency, traditional motor-driven methods, such as those using transmission mechanisms like belts and gears, are gradually showing their limitations. These traditional methods are often accompanied by problems such as transmission errors, energy loss, and high maintenance costs, and are no longer able to meet the more demanding needs of industrial applications. To address these issues, direct drive technology has been introduced. Its core advantage lies in eliminating the intermediate transmission link in traditional drives, allowing the motor to directly drive the load, thereby greatly improving control accuracy and response speed.

[0003] The core of direct drive technology lies in increasing and precisely controlling the motor's output torque through high-performance magnetic materials and advanced power electronics. Advances in magnetic materials provide the motor with a stronger magnetic field, enabling it to provide the necessary torque and speed without a mechanical speed-increasing mechanism.

[0004] In the prior art, there is still the problem of uneven magnetic field distribution, which will affect the efficiency and output torque of the motor, and further affect the overall performance of the motor.

[0005] Therefore, a dual-rotor direct-drive motor is proposed to solve the above problems. Utility Model Content

[0006] The main purpose of the utility model is to provide a dual-rotor direct-drive motor, aiming to solve the problem of uneven magnetic field distribution in existing motors, which affects the motor efficiency and output torque.

[0007] In order to achieve the above-mentioned purpose of the utility model, the utility model proposes a dual-rotor direct-drive motor, comprising a housing, an output shaft, and a stator mounted on the housing, wherein the output shaft is mounted at the axial center of the housing, and the upper rotor and the lower rotor are mounted on the rotating shaft on both sides of the stator in a mirror-symmetrical manner and rotate with the output shaft;

[0008] The upper rotor includes a first magnetic member, and the lower rotor includes a second magnetic member. The first magnetic member and the second magnetic member are arranged opposite to each other, and when the upper rotor and the lower rotor rotate, the magnetic poles of the first magnetic member and the second magnetic member are the same.

[0009] Furthermore, a plurality of coils are provided in the circumferential direction of the stator.

[0010] Furthermore, an encoder is included, and the encoder is arranged at the lower end of the lower rotor. A fixing piece is provided on the lower rotor for fixing the encoder to the lower rotor.

[0011] Furthermore, the lower rotor is provided with a receiving groove for accommodating and installing the fixing member.

[0012] Furthermore, the encoder includes a code disc, and the housing is provided with a positioning groove for installing the code disc.

[0013] Furthermore, the encoder also includes a reader, and a mounting plate is bolted to the housing, and the reader is fixedly connected to the mounting plate.

[0014] Furthermore, the code disc is provided with a sliding groove, and the reading head is provided with a sliding block, and the sliding block is slidingly connected to the sliding groove.

[0015] Furthermore, it also includes an inner cover plate and an outer cover plate, the outer cover plate is detachably connected to the outer shell, and the inner cover plate is rotatably connected to the rotating shaft.

[0016] Furthermore, a wire outlet slot is provided at the lower end of the shell for supplying wires to the stator.

[0017] Furthermore, a sealing plate is bolted to the outer shell, and the sealing plate is provided with a wire outlet corresponding to the wire outlet groove.

[0018] Beneficial effects:

[0019] The utility model discloses a dual-rotor direct-drive motor, comprising a housing, an output shaft and a stator mounted on the housing, the output shaft being mounted at the axial center of the housing, the upper rotor and the lower rotor being mirror-symmetrically mounted on the rotating shafts on both sides of the stator, and as the output shaft rotates, the upper rotor comprises a first magnetic part, the lower rotor comprises a second magnetic part, the first magnetic part and the second magnetic part are arranged relative to each other, and when the upper rotor and the lower rotor rotate, the magnetic poles of the first magnetic part and the second magnetic part are the same; this arrangement is because when the magnetic poles of the magnetic parts on the two rotors are the same, a mutually repulsive force will be generated between them, which helps to maintain the balance of the rotor and reduce vibration and noise caused by magnetic imbalance. The motor adopts an upper and lower rotor structure, and the magnetic poles of the magnets are mounted relative to each other. This design structure can generate a rotational torque. When current passes through the stator to generate a magnetic field, it interacts with the magnetic parts on the rotor to generate attraction and repulsion forces, which drives the rotor to rotate and increases the motor torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exploded view of the structure of a dual-rotor direct-drive motor according to an embodiment of the present invention;

[0021] Figure 2This is a partial structural diagram of a dual-rotor direct-drive motor according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the upper rotor of a dual-rotor direct-drive motor according to an embodiment of the present invention;

[0023] Figure 4 1 is a schematic diagram of the stator of a dual-rotor direct-drive motor according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the lower rotor of a dual-rotor direct-drive motor according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of an encoder for a dual-rotor direct-drive motor according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the encoder portion of a dual-rotor direct-drive motor according to an embodiment of the present invention;

[0027] in:

[0028] 1. Inner end cap; 2. Outer end cap; 3. Upper rotor; 31. Upper rotor body; 32. First magnetic component; 4. Stator; 41. Stator body; 42. Coil; 43. Iron core; 5. First bearing; 6. Lower rotor; 61. Lower rotor body; 62. Second magnetic component; 7. Second bearing; 8. Output shaft; 9. Encoder; 91. Code disk; 92. Read head; 10. Housing; 11. Mounting plate; 12. Closing plate

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] 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.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] Reference Figures 1 to 7 The utility model discloses a dual-rotor direct-drive motor, comprising a housing 10, an output shaft 8, and a stator 4 mounted on the housing 10. The output shaft 8 is mounted at the axial center of the housing 10. The upper rotor 3 and the lower rotor 6 are mirror-symmetrically mounted on the rotating shafts on both sides of the stator 4 and rotate with the output shaft 8.

[0035] The upper rotor 3 includes a first magnetic member 32, and the lower rotor 6 includes a second magnetic member 62. The first magnetic member 32 and the second magnetic member 62 are arranged opposite to each other, and when the upper rotor 3 and the lower rotor 6 rotate, the magnetic poles of the first magnetic member 32 and the second magnetic member 62 are the same.

[0036] The dual-rotor direct-drive motor of the present application includes a circular housing 10 and a stator 4. The upper rotor 3 and the lower rotor 6 are installed on the rotating shaft on both sides of the length direction of the stator 4. The rotating shaft includes a first bearing 5 and a second bearing 7. The second bearing 7 is pressed onto the output shaft 8 by a machine to make the inner ring more secure. The lower rotor 6 is installed on the outer ring of the second bearing 7 and can make circular motion relative to the stator 4. The first bearing 5 is pressed onto the top of the lower rotor 6 by a machine. The inner ring of the first bearing 5 is tightly fitted with the output shaft 8. The outer ring of the first bearing 5 presses the lower rotor 6 and rotates with the lower rotor 6; the upper rotor 3 includes an upper rotor body 31 and a first magnetic part 32, and the lower rotor 6 consists of a lower rotor body 61 and a second magnetic part 62, wherein the first magnetic part 32 and the second magnetic part 62 are both magnets, and the magnets are fixed to the rotor body by glue. The glue can evenly distribute stress between the entire contact surface, reducing damage to the magnet or rotor body due to local stress concentration.

[0037] The magnet includes an N pole and an S pole. The upper rotor 3 and the lower rotor 6 are correspondingly provided with pin holes. After the upper rotor 3 and the lower rotor 6 are installed in the corresponding positions, they are further positioned by pins so that when rotating, the magnetic poles of the upper rotor 3 and the lower rotor 6 are in the same direction. Using pin holes for positioning can ensure that the upper rotor 3 and the lower rotor 6 have a precise relative position after installation. At the same time, when the magnetic poles of the upper rotor 3 and the lower rotor 6 are arranged in relative directions, the two work together to generate greater torque, that is, the N pole of one rotor faces the S pole of the other rotor, which can generate a stronger magnetic attraction. This attraction can be converted into the output torque of the motor, thereby improving the torque density and efficiency of the motor.

[0038] The stator 4 is provided with a plurality of coils 42 in the circumferential direction.

[0039] The stator 4 includes a stator body 41, an iron core 43 and a coil 42. The stator body 41 is connected to the housing 10 by screws. The coil 42 is wound around the iron core 43 and is arranged in the stator body 41. In the embodiment of the present application, the stator core 43 is shorter than the stator core 43 used in other motors. The stator 4 contains multiple coils 42 distributed along the circumference. Therefore, the motor is flat as a whole and the length space required for axial installation is small. The shortened stator core 43 and the compact coil 42 layout make the motor flatter, reduce the axial space requirement, and facilitate integration into space-constrained equipment. At the same time, the compact coil 42 layout can provide a higher power density, so that the motor can provide a larger output torque in a smaller volume.

[0040] The working principle of the motor is based on electromagnetic induction. When current passes through the coil 42 in the stator 4, a rotating magnetic field is generated. Since the stator core 43 is short, the magnetic field is mainly concentrated in the rotor area, interacting with the permanent magnets on the rotor to generate torque, causing the rotor to rotate. This compact coil 42 layout helps to improve the utilization of the magnetic field and the efficiency of the motor.

[0041] The dual-rotor direct-drive motor further includes an encoder 9, which is provided at the lower end of the lower rotor 6. A fixing member is provided on the lower rotor 6 for fixing the encoder 9 to the lower rotor 6.

[0042] The lower rotor 6 is provided with a receiving groove for receiving and installing the fixing member;

[0043] The encoder 9 includes a code disc 91, and the housing 10 is provided with a positioning groove for mounting the code disc 91;

[0044] The encoder 9 further includes a reader 92 , and a mounting plate 11 is bolted to the housing 10 , and the reader 92 is fixedly connected to the mounting plate 11 ;

[0045] The code disc 91 is provided with a sliding groove, and the reading head 92 is provided with a sliding block, and the sliding block is slidingly connected to the sliding groove.

[0046] A accommodating groove is provided on the lower rotor 6 for accommodating the fixing part, so that the fixing part can flow into the groove when squeezed to prevent the formation of cavities and contamination of other components. The magnet is fixedly connected to the rotor body through the fixing part. In the embodiment of the present application, the fixing part is glue.

[0047] The encoder 9 includes a code disc 91 and a reader 92, wherein the code disc 91 is fixed to the bottom surface of the lower rotor 6 with glue, so that the code disc 91 of the encoder can rotate with the rotor. The reader 92 of the encoder is mounted on a reader 92 mounting plate 11, and the reader 92 mounting plate 11 is fixed to the housing 10 by screws. In order to improve the motor accuracy and the manufacturing error of the encoder 9 code disc 91, the present application is designed with two positioning slots for the encoder 9 installation position on the housing 10, which can compensate for the installation and manufacturing error of the encoder code disc 91 to make the motor more accurate.

[0048] In this embodiment, the encoder's code disc 91 is fixed to the bottom surface of the lower rotor 6 with glue to ensure the synchronous rotation of the code disc 91 and the rotor, thereby achieving real-time monitoring of the rotor position and speed. This fixing method simplifies the connection mechanism between the encoder 9 and the rotor, avoids complex mechanical connections, and reduces errors that may occur during assembly. The encoder's reader 92 is mounted on the reader 92 mounting plate 11 and fixed to the housing 10 by screws, providing a stable reading environment and ensuring the precise relative position between the reader 92 and the code disc 91. In addition, the two encoder 9 mounting position positioning slots designed on the housing 10 provide flexible adjustment space for the encoder 9, which can compensate for errors caused by the manufacturing or installation process and ensure the accuracy of the motor operation.

[0049] When the code disk 91 rotates with the rotor, these marks will pass through the detection area of ​​the reader 92 in turn. The changes in the marks detected by the reader 92 are converted into electrical signals. After being processed by the internal circuit, they are converted into coded signals that can represent position and speed. These signals are sent to the control system of the motor. The control system adjusts the operating parameters of the motor according to the feedback information provided by the encoder 9 to achieve precise control. By designing two encoder 9 installation position positioning grooves on the housing 10, the position of the encoder 9 can be fine-tuned during the manufacturing or installation process to compensate for possible errors and further improve the control accuracy of the motor.

[0050] The dual-rotor direct-drive motor further includes an inner cover plate and an outer cover plate. The outer cover plate is detachably connected to the housing 10 , and the inner cover plate is rotatably connected to the rotating shaft.

[0051] The inner cover is connected to the rotating shaft, typically through a keyway, set screws, or other mechanical connection method to achieve synchronous rotation with the rotating shaft. In this way, the inner cover not only presses the inner ring of the upper bearing to ensure the stability of the bearing during operation, but also absorbs the vibration generated when the bearing is subjected to force to a certain extent, reducing the impact on motor performance. The outer cover is fixed to the motor housing 10 through a detachable connection method (such as a clip, screws, etc.), forming a sealed housing 10 structure. This design allows the operator to easily open and close the outer cover for maintenance and inspection of the motor, while preventing dust and other contaminants from entering the interior of the motor, protecting the cleanliness and normal operation of the motor.

[0052] The lower end of the housing 10 is provided with a wire outlet slot for supplying wires to the stator 4 .

[0053] After the stator coil 42 of the motor completes the current conversion and distribution, the generated current needs to flow to the control system or load outside the motor. These wires are guided out in an orderly manner through the outlet slots, avoiding confusion and mutual interference of the wires inside or outside the motor.

[0054] A sealing plate 12 is bolted to the housing 10 , and the sealing plate 12 is provided with a wire outlet corresponding to the wire outlet groove.

[0055] The sealing plate 12 is fixed to the motor housing 10 by bolts, and the wire outlet thereon precisely corresponds to the wire outlet slot of the housing 10, forming a channel from the inside of the motor to the outside, and the converged motor wires and the encoder 9 wires are wired out along the wire outlet; when the stator coil 42 of the motor completes the current conversion, the wires enter the sealing plate 12 through the wire outlet slot, and are then led out to the outside through the wire outlet. In this process, the wire outlet of the sealing plate 12 plays a role in guiding and protecting the wires, ensuring that the wires will not be damaged or interfered with during the lead-out process. At the same time, the sealing treatment between the sealing plate 12 and the housing 10, such as the use of a sealing ring or sealant, can prevent pollutants such as dust and moisture from entering the interior of the motor through the wire outlet, thereby ensuring the stable operation and long-term reliability of the motor.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dual-rotor direct-drive motor, characterized in that: The invention comprises a housing (10), an output shaft (8), and a stator (4) mounted on the housing (10), wherein the output shaft (8) is mounted at the axial center of the housing (10), and the upper rotor (3) and the lower rotor (6) are mounted on the rotating shafts on both sides of the stator (4) in a mirror-symmetrical manner and rotate along with the output shaft (8); The upper rotor (3) includes a first magnetic member (32), and the lower rotor (6) includes a second magnetic member (62). The first magnetic member (32) and the second magnetic member (62) are arranged relative to each other, and when the upper rotor (3) and the lower rotor (6) rotate, the magnetic poles of the first magnetic member (32) and the second magnetic member (62) are the same.

2. The dual-rotor direct-drive motor according to claim 1, characterized in that: The stator (4) is provided with a plurality of coils (42) in the circumferential direction.

3. The dual-rotor direct-drive motor according to claim 1, characterized in that: It also includes an encoder (9), which is arranged at the lower end of the lower rotor (6). A fixing piece is provided on the lower rotor (6) for fixing the encoder (9) to the lower rotor (6).

4. The dual-rotor direct-drive motor according to claim 3, characterized in that: The lower rotor (6) is provided with a receiving groove for receiving and installing the fixing member.

5. The dual-rotor direct-drive motor according to claim 3, characterized in that: The encoder (9) includes a code disc (91), and the housing (10) is provided with a positioning groove for mounting the code disc (91).

6. The dual-rotor direct-drive motor according to claim 5, characterized in that: The encoder (9) further includes a reader (92), and a mounting plate (11) is bolted to the housing (10), and the reader (92) is fixedly connected to the mounting plate (11).

7. The dual-rotor direct-drive motor according to claim 6, characterized in that: The code disc (91) is provided with a sliding groove, and the reading head (92) is provided with a sliding block, and the sliding block is slidingly connected to the sliding groove.

8. The dual-rotor direct-drive motor according to claim 1, characterized in that: It also includes an inner cover plate and an outer cover plate, wherein the outer cover plate is detachably connected to the outer shell (10), and the inner cover plate is rotatably connected to the rotating shaft.

9. The dual-rotor direct-drive motor according to claim 1, characterized in that: The lower end of the housing (10) is provided with a wire outlet slot for supplying wires to the stator (4).

10. The dual-rotor direct-drive motor according to claim 9, characterized in that: A sealing plate (12) is bolted to the housing (10), and the sealing plate (12) is provided with a wire outlet corresponding to the wire outlet groove.

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