Current-shunting double-rotor coaxial motor

Abstract

The invention relates to the technical field of synchronous motors, aims to solve the problem that in the prior art, a high-power low-rotating-speed motor has high requirements for a motor structure, material strength, an electrical distance and a ventilation structure due to large torque and large current, and provides a current-shunting double-rotor coaxial motor which comprises a rotating shaft, and two rotor racks are coaxially mounted on the rotating shaft. A rotor iron core is mounted on each rotor rack, and the two rotor iron cores are coaxially arranged; a stator iron core is arranged on the outer side of each rotor iron core, the two stator iron cores are symmetrically arranged, and each stator iron core is mounted on a corresponding stator base; each rotor iron core and each stator iron core are respectively connected with a lead; the double rotors are coaxially arranged, the output torque of the motor is improved, the size of the motor is small, the requirements for the structure and material strength of the motor are low, the double stators are symmetrically arranged, power is independently supplied to achieve current shunting, and the requirements for the design of a ventilation structure and an insulation structure of the motor, selection of insulation materials, electrical spacing and the like are low.

Description

Technical Field

[0001] This invention relates to the field of synchronous motor technology, and more specifically, to a current-splitting dual-rotor coaxial motor. Background Technology

[0002] In high-power, low-speed motors, due to the formula P=Tω (where P represents power, T represents torque, and ω represents angular velocity), the motor torque is often very large. Since torque T=Ct*Φ*I, within a certain range, the motor torque and armature current exhibit a positive correlation. The manufacturing and design challenges of such high-power, low-speed motors lie in the challenges that large torque and current pose to the motor structure, material strength, electrical clearance, and ventilation structure. The traditional solution is to continuously increase the radial dimension of the motor to achieve higher output power. However, under the demand for high torque, increasing the motor size poses a challenge to the structural strength of the motor, leading to exponentially increasing structural costs and strength risks. At the same time, the large current determines that the motor's heat loss is huge, requiring a more sophisticated ventilation structure to increase heat dissipation power to meet the requirements of stable operation. The large current also has a significant impact on the design of the motor's insulation structure, the selection of insulation materials, and electrical spacing, which are also carefully considered during motor design. In general, using this type of motor with a traditional structure presents enormous design challenges. Summary of the Invention

[0003] The present invention aims to provide a current-splitting dual-rotor coaxial motor to solve the problem that high-power, low-speed motors with high torque and high current in the prior art have high requirements for motor structure, material strength, electrical distance and ventilation structure.

[0004] This invention is achieved using the following technical solution: This invention provides a current-splitting dual-rotor coaxial motor, including a shaft, on which two rotor frames are coaxially mounted, and each rotor frame is equipped with a rotor core, the two rotor cores being arranged coaxially; a stator core is arranged on the outer side of each rotor core, the two stator cores being arranged symmetrically, and each stator core is mounted on a corresponding stator frame; each rotor core and each stator core are respectively connected to a lead wire.

[0005] As a preferred technical solution: The two rotor frames are a left rotor frame and a right rotor frame, and the two rotor cores are a left rotor core and a right rotor core. The left rotor core is mounted on the left rotor frame, and the right rotor core is mounted on the right rotor frame.

[0006] As a preferred technical solution: The two stator cores are a left stator core and a right stator core, with the left stator core mounted on the left stator frame and the right stator core mounted on the right stator frame.

[0007] As a preferred technical solution: The left stator base and the right stator base are arranged side by side and are fixedly connected.

[0008] As a preferred technical solution: A retainer is connected to the stator frame, and the retainer is located between the two rotor frames.

[0009] As a preferred technical solution: The stator frame includes multiple frame units, each frame unit being arc-shaped, and the multiple frame units are assembled to form a complete circular structure.

[0010] As a preferred technical solution: The two adjacent base units are positioned by pin holes and then connected by bolts.

[0011] As a preferred technical solution: The rotating shaft has a hollow structure.

[0012] As a preferred technical solution: The left end of the rotating shaft is connected to a left end cap, and the right end of the rotating shaft is connected to a right end cap.

[0013] As a preferred technical solution: Both the left end cap and the right end cap are connected to the rotating shaft via sliding bearings. The sliding bearings are sleeved on the rotating shaft, and the left end cap and the right end cap are connected to the outside of the corresponding sliding bearings.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. This invention utilizes a coaxial arrangement of two rotors, each capable of independently generating electromagnetic torque. When the two rotors rotate coaxially, their output torques are superimposed, significantly improving the overall output torque of the motor and meeting high-power requirements. Simultaneously, it does not significantly increase motor size, placing lower demands on motor structure and material strength, resulting in lower structural costs. Furthermore, the coaxial design allows the two rotors to share the same output shaft, simplifying the mechanical structure and improving system compactness and reliability. This invention employs a symmetrical arrangement of two stators with separate power supplies to achieve current shunting. Each stator current is half the design value, reducing heat load and improving the motor's heat dissipation performance and reliability. It also places lower demands on motor ventilation structure, insulation structure design, insulation material selection, and electrical spacing. The invention incorporates a cage design to fix and support the stator, ensuring it does not deform, maintaining motor rigidity, improving operational stability and reliability, and extending the motor's service life.

[0015] 2. This invention divides the large and heavy stator frame into sections for easy transport, ensuring the convenience of transporting large motors. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the current-splitting dual-rotor coaxial motor described in this invention.

[0017] Figure 2 This is a cross-sectional view of the cage described in this invention.

[0018] Figure 3 This is a schematic diagram of the stator frame described in this invention.

[0019] Icons: 1-Left stator frame, 2-Left stator core, 3-Left rotor core, 4-Left rotor frame, 5-Right shaft, 6-Right stator frame, 7-Right stator core, 8-Right rotor core, 9-Right rotor frame, 10-Left end cover, 11-Right end cover, 12-Left shaft, 13-Cage, 14-Stator lead one, 15-Stator lead two, 16-Rotor lead one, 17-Rotor lead two, 18-Frame unit. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1 like Figure 1 and Figure 2As shown in the figure, this embodiment proposes a current-splitting dual-rotor coaxial motor, including a rotating shaft, on which two rotor frames are coaxially mounted, namely a left rotor frame 4 and a right rotor frame 9.

[0022] Preferably, the two rotor frames are fixedly mounted on the rotating shaft by means of a stop and bolts, wherein the stop on the rotor frame matches the stop on the rotating shaft, and the rotor frame is fixed to the rotating shaft by bolts.

[0023] Each rotor frame is equipped with a rotor core. Specifically, the left rotor frame 4 is equipped with a left rotor core 3, and the right rotor frame 9 is equipped with a right rotor core 8.

[0024] Preferably, the left rotor core 3 is fixedly mounted on the left rotor frame 4 by bolts, and the right rotor core 8 is fixedly mounted on the right rotor frame 9 by bolts.

[0025] Each rotor core has a stator core arranged on its outer side. Specifically, the left stator core 2 is arranged on the outer side of the left rotor core 3, and the right stator core 7 is arranged on the outer side of the right rotor core 8.

[0026] The left rotor core 3 is connected to rotor lead 16, which supplies power through rotor lead 16; the right rotor core 8 is connected to rotor lead 2 17, which supplies power through rotor lead 2 17. The left stator core 2 is connected to stator lead 14 and is powered through stator lead 14. The right stator core 7 is connected to stator lead 2 15 and is powered through stator lead 2 15, so that the two rotor cores and the stator core are powered separately.

[0027] The stator cores and rotor cores on the left and right sides of this invention constitute two motors. By adjusting the power input of each stator core and rotor core, the power frequency and phase of the two motors are adjusted to be consistent, so that the two motors have phase speed and in-phase composite magnetic field, achieving the purpose of driving the shaft with both rotors simultaneously and increasing the shaft output torque. Compared with the traditional single-core motor, under the same voltage, the stator and rotor currents are both halved, realizing the current splitting effect and reducing the challenges of heat dissipation and insulation of stator and rotor windings caused by large current.

[0028] The stator cores are mounted on corresponding stator frames. Specifically, the left stator core 2 is mounted on the left stator frame 1, and the right stator core 7 is mounted on the right stator frame 6. Preferably, the stator cores are connected to the corresponding stator frames by positioning ribs.

[0029] The left stator frame 1 and the right stator frame 6 are arranged side by side and are fixedly connected.

[0030] Preferably, the left stator base 1 and the right stator base 6 are provided with axial pin holes on opposite sides. After the lead ends of the left stator base 1 and the right stator base 6 are aligned, they are connected by positioning through the axial pin holes and installing axial bolts in the axial pin holes, and then fixed by welding.

[0031] A retainer 13 is connected to the stator frame, and the retainer 13 is located between the two rotor frames and also between the two rotor cores. The retainer 13 is used to ensure that the stator frame does not deform.

[0032] Preferably, the retainer 13 is connected to the left stator base 1 and the right stator base 6 by means of a stop and bolts. The stop on the retainer 13 mates with the stop on the stator base, and the retainer 13 is fixedly connected to the stator base by bolts.

[0033] The rotating shaft is the right rotating shaft 5. The dual-rotor coaxial motor also includes a left rotating shaft 12. The right rotating shaft 5 and the left rotating shaft 12 are coaxially connected. Due to space limitations, the left rotating shaft 12 cannot be integrally formed with the right rotating shaft 5. If space permits, a single rotating shaft can be provided.

[0034] Preferably, both the left rotating shaft 12 and the right rotating shaft 5 are hollow structures, and they are fixedly connected together by bolts.

[0035] The left end cap 10 is connected to the left side of the left rotating shaft 12, and the right end cap 11 is connected to the right side of the right rotating shaft 5.

[0036] Preferably, the outer side of the left end cover 10 is connected to the left stator base 1, and the inner side of the left end cover 10 is connected to the left rotating shaft 12 via a sliding bearing. The sliding bearing is sleeved on the left rotating shaft 12, and the left end cover 10 is connected to the outer side of the sliding bearing. The outer side of the right end cover 11 is connected to the right stator base 6, and the inner side of the right end cover 11 is connected to the right rotating shaft 5 via a sliding bearing. The sliding bearing is sleeved on the right rotating shaft 5, and the right end cover 11 is connected to the outer side of the sliding bearing.

[0037] The outer side of the end cover is connected to the stator frame, and the inner side is connected to the bearing. The bearing is sleeved on the rotating shaft, realizing the function of connecting the stator and the rotor and supporting the stator.

[0038] The dual-rotor coaxial motor of the present invention can be used in applications requiring high power, low speed, and high torque.

[0039] This invention utilizes a coaxial arrangement of two rotors, each capable of independently generating electromagnetic torque. When the two rotors rotate coaxially, their output torques are superimposed, significantly improving the overall output torque of the motor and meeting high-power requirements. Simultaneously, it does not significantly increase motor size, minimizing requirements on motor structure and material strength, resulting in low structural cost. Furthermore, the coaxial design allows the two rotors to share a single output shaft, simplifying the mechanical structure and improving system compactness and reliability. The invention employs a symmetrical arrangement of two stators with separate power supplies to achieve current shunting. Each stator current is half the design value, reducing heat load and improving the motor's heat dissipation performance and reliability. It also minimizes requirements on motor ventilation structure, insulation structure design, insulation material selection, and electrical spacing. Finally, the invention incorporates a cage to fix and support the stators, ensuring they do not deform, maintaining motor rigidity, improving operational stability and reliability, and extending the motor's service life.

[0040] Example 2 The difference between this embodiment and Embodiment 1 is that: like Figure 3 As shown, the stator frame includes multiple frame units 18, each frame unit 18 being arc-shaped, and the multiple frame units 18 are assembled to form a complete circular structure.

[0041] Preferably, two adjacent base units 18 are positioned by pin holes and then connected by bolts.

[0042] Preferably, the stator frame has a three-lobed structure (i.e., it has three frame units 18), such as... Figure 3 As shown, the three-lobed structure is first positioned by pin holes, and then the two adjacent base units 18 are fixedly connected by bolts to form a complete circular structure.

[0043] During manufacturing, the stator core is first stacked within the circular structure of the stator frame. Then, the stator frame is divided into three frame units 18, each containing one-third of the stator core. The three frame units 18 with stator cores are transported separately and then assembled during the final assembly stage. They are positioned using pin holes, connected with bolts, and finally welded back into the circular structure. In this way, by dividing and transporting the large and heavy stator frame in sections, the ease of transporting the large motor is ensured.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A current-splitting dual-rotor coaxial motor, characterized in that: The device includes a rotating shaft on which two rotor frames are coaxially mounted. Each rotor frame has a rotor core mounted on it, and the two rotor cores are arranged coaxially. A stator core is arranged on the outer side of each rotor core, and the two stator cores are arranged symmetrically. Each stator core is mounted on a corresponding stator base. Each rotor core and each stator core are connected to a lead wire.

2. The current-splitting dual-rotor coaxial motor according to claim 1, characterized in that: The two rotor frames are a left rotor frame and a right rotor frame, and the two rotor cores are a left rotor core and a right rotor core. The left rotor core is mounted on the left rotor frame, and the right rotor core is mounted on the right rotor frame.

3. The current-splitting dual-rotor coaxial motor according to claim 1, characterized in that: The two stator cores are a left stator core and a right stator core, with the left stator core mounted on the left stator frame and the right stator core mounted on the right stator frame.

4. The current-splitting dual-rotor coaxial motor according to claim 3, characterized in that: The left stator base and the right stator base are arranged side by side and are fixedly connected.

5. The current-splitting dual-rotor coaxial motor according to claim 1, characterized in that: A retainer is connected to the stator frame, and the retainer is located between the two rotor frames.

6. The current-splitting dual-rotor coaxial motor according to claim 1, characterized in that: The stator frame includes multiple frame units, each frame unit being arc-shaped, and the multiple frame units are assembled to form a complete circular structure.

7. The current-splitting dual-rotor coaxial motor according to claim 6, characterized in that: The two adjacent base units are positioned by pin holes and then connected by bolts.

8. The current-splitting dual-rotor coaxial motor according to claim 1, characterized in that: The rotating shaft has a hollow structure.

9. The current-splitting dual-rotor coaxial motor according to claim 1, characterized in that: The left end of the rotating shaft is connected to a left end cap, and the right end of the rotating shaft is connected to a right end cap.

10. The current-splitting dual-rotor coaxial motor according to claim 9, characterized in that: Both the left end cap and the right end cap are connected to the rotating shaft via sliding bearings. The sliding bearings are sleeved on the rotating shaft, and the left end cap and the right end cap are connected to the outside of the corresponding sliding bearings.

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