Redundant low-voltage high-speed servo motor

Abstract

The utility model relates to a kind of redundancy low-pressure high-speed servo motor, solve the problem that current low-pressure servo motor has not satisfied the occasion of redundant use of high security. First rotor and second rotor are sequentially fixed on the rotor shaft of the device from front to back, the outside of first rotor and second rotor is respectively correspondingly set first stator and second stator, annular stator support frame is set between first stator and second stator, a plurality of wiring grooves are opened on the outer wall of second stator along front-back direction, a plurality of U-shaped grooves are opened towards back in stator support frame, U-shaped groove is aligned with wiring groove, first stator lead-out wire is worn from the inside of stator support frame along U-shaped groove to the outside of stator support frame, and then wiring groove towards back end along the outer wall of second stator. The utility model first stator lead-out wire and second stator lead-out wire are wired respectively on two sides, make the wiring of double-stator electronic well-ordered, improve yield, reduce maintenance difficulty, improve the quality and use experience of product.

Description

Technical Field

[0001] This utility model belongs to the field of motor structure, and relates to a low-voltage servo motor, and particularly to a redundant low-voltage high-speed servo motor. Background Technology

[0002] Compared to conventional DC motors, low-voltage servo motors offer advantages such as smaller size, longer lifespan, higher efficiency, and higher motion precision, leading to their widespread use in robots, AGVs, and military equipment. However, applications in these high-precision devices place even more stringent demands on motor stability. With the increasing prevalence of these applications and the growing need for enhanced motor stability, existing low-voltage servo motors are no longer sufficient for applications requiring high-safety redundancy. A fault in the motor itself or the encoder wiring can cause system malfunctions, thus creating an urgent need for low-voltage servo products with redundancy.

[0003] A Chinese patent published on August 26, 2022, with publication number CN 217307515 U, discloses a dual-stator, dual-rotor automotive alternator, including a shaft, a front cover, a rear cover, a rectifier, and a regulator. It also includes two rotors mounted on the shaft and two stators corresponding to the rotors, with the rotors axially spaced apart. The two stators are positioned between the front cover and the rear cover, and an intermediate end cover connects the two stators. The two stators are redundant; if one stator fails, the other can still provide half the power. However, the dual-stator design of the motor means double the wiring requirements. While the patent proposes the dual-stator concept, it does not describe how to ensure orderly wiring for the two stators. As mentioned earlier, low-voltage servo motors are characterized by their small size and high motion precision. How to achieve orderly wiring for the two stators within the limited internal space of the motor is crucial not only for reducing the error rate during assembly but also for the stability of the motor during long-term operation. Utility Model Content

[0004] The purpose of this invention is to solve the problem that existing low-voltage servo motors can no longer meet the requirements of high-safety redundant use. It provides a redundant low-voltage high-speed servo motor. Through the mutual redundancy of the two stators, the motor can maintain stable operation for a period of time with the remaining stators when a single stator fails. Furthermore, through the design of the wiring groove of the stator support frame, the lead wires of the two stators can be arranged in an orderly manner, ensuring that there are many lead wires but they are not messy, reducing the probability of lead wire wiring errors, and ensuring long-term stable operation of the motor.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a redundant low-voltage high-speed servo motor, including a motor housing, a stator and a rotor are arranged inside the motor housing, the rotor is sleeved on the rotor shaft with the output end of the rotor shaft as the front end, a first rotor and a second rotor are fixedly arranged on the rotor shaft from front to back, the first rotor and the second rotor are respectively arranged on the outer sides of the first rotor and the second rotor, and an annular stator support frame is arranged between the first stator and the second stator, a plurality of wiring grooves are opened on the outer wall of the second stator along the front-back direction, and a plurality of U-shaped grooves are opened on the stator support frame facing backward, the U-shaped grooves are aligned with the wiring grooves, the first stator lead wire is connected and passes through the U-shaped groove from the inner side of the stator support frame to the outer side of the stator support frame, and then runs along the wiring groove on the outer wall of the second stator to the rear end, and the second stator lead wire runs directly to the rear end.

[0006] Traditional dual-stator motors suffer from tangled and difficult-to-distinguish stator leads, leading to wiring errors during assembly and maintenance. Such errors can damage the entire motor upon power-on. This device addresses this by utilizing a special wiring groove design on the outer wall of the second stator, combined with a U-shaped groove on the rearward-facing stator support frame. This allows the first stator leads to pass through the U-shaped groove and wiring groove, running along the outer edge with a one-line-one-groove correspondence, thus isolating the leads and preventing merging. The second stator leads can then be routed from the opposite side in a circumferential direction. The orderly routing of both first and second stator leads within a limited space reduces assembly difficulty, lowers wiring error rates, facilitates subsequent use and maintenance, enhances product image, and improves user experience.

[0007] Preferably, the first stator and the second stator have the same structure. The first stator and the second stator use the same mechanism, and both are interchangeable, eliminating the need for two molds and reducing production costs.

[0008] Preferably, the front and rear faces of the stator support frame are respectively provided with positioning protrusions, which are aligned with the wiring grooves. The stator support frame does not have U-shaped grooves at the locations of the protrusions. The stator support frame uses protrusions to engage with the wiring grooves of the first and second stators for positioning, making full use of the existing structure of the stator. The protrusions can also serve as the interface between the first and second stator leads, allowing them to connect from opposite sides of the protrusion structure, which is simple, intuitive, and easy to understand.

[0009] Preferably, the first stator lead and the second stator lead are located on opposite sides inside the motor housing.

[0010] Preferably, the stator support frame is symmetrically arranged on both sides, and the number of U-shaped slots on each side of the stator support frame is not less than three. Since most stator leads are three-phase lines, the presence of at least three U-shaped slots satisfies the design requirement of one slot per line.

[0011] Preferably, the wiring channels are evenly distributed in the circumferential direction of the second stator, and the total number of wiring channels is not less than 8.

[0012] Preferably, a rotor support frame is provided between the first rotor and the second rotor, and the rotor support frame is sleeved on the outer surface of the rotor shaft.

[0013] Preferably, the motor housing includes a rear end cover located at the rear end of the motor. A drive gear, which moves with the rear end of the rotor shaft, is mounted on the rear end cover. A first encoder and a second encoder are respectively meshed on both sides of the drive gear. The first encoder and the second encoder are respectively equipped with a first magnet and a second magnet for outputting rotation signals. The encoders also employ a redundant design with dual signal outputs to prevent motor malfunction due to the failure of a single encoder.

[0014] Preferably, a brake capable of clamping and braking the rotor shaft is provided on the front side of the rear end cover.

[0015] Preferably, the rear surface of the rear end cover is provided with a lead wire connector, and the first stator lead wire, the second stator lead wire, the first encoder lead wire, the second encoder lead wire, and the brake lead wire are all connected to the lead wire connector.

[0016] This utility model adopts a separate stator lead routing structure, so that the first stator lead and the second stator lead are routed on two separate sides. Each stator lead on one side is routed in a slot to avoid parallel routing, which makes the routing of the dual stator electronics orderly, improves the yield rate, reduces the difficulty of maintenance, and improves the quality of the product and the user experience. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0019] Figure 2 This is a schematic diagram of a dual-stator wiring structure according to this utility model.

[0020] Figure 3 This is a schematic diagram of a stator support frame structure according to the present invention.

[0021] Figure 4 This is a schematic diagram of a dual encoder structure according to this utility model.

[0022] In the diagram: 1. Motor housing, 2. Front cover, 3. Rear cover, 4. Rotor shaft, 5. First rotor, 6. Second rotor, 7. Rotor support frame, 8. First stator, 9. Second stator, 10. Stator support frame, 11. Brake, 12. Drive gear, 13. First encoder, 14. Second encoder, 15. Lead wire connector, 16. First stator lead wire, 17. Second stator lead wire, 18. Wiring groove, 19. U-shaped groove, 20. Clip protrusion. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0024] Example: A redundant low-voltage high-speed servo motor, such as Figure 1 As shown, the device includes a motor housing 1, a front cover 2 at the front end of the motor housing (the front end is the rotor shaft output section), a rear cover 3 at the rear end (the rear end is the wiring terminal), and a rotor shaft 4 centrally located on the motor housing. A first rotor 5 and a second rotor 6 are fixedly mounted on the rotor shaft 4 from front to back. A rotor support frame 7 is provided between the first rotor 5 and the second rotor 6, and the rotor support frame 7 is sleeved on the outer surface of the rotor shaft 4.

[0025] The first stator 8 and the second stator 9 are respectively disposed on the outer sides of the first rotor 5 and the second rotor 6, and the first stator 8 and the second stator 9 are fixed to the motor housing 1. Figure 2 , 3 As shown, an annular stator support frame 10 is provided between the first stator 8 and the second stator 9. The first stator and the second stator have the same structure. Several wiring grooves 18 are formed along the front-to-back direction on the outer wall of the second stator 9. Several U-shaped grooves 19 are formed rearward on the stator support frame. The U-shaped grooves 19 are aligned with the wiring grooves. The front and rear faces of the stator support frame are also provided with positioning protrusions 20 at 180-degree intervals. The protrusions 20 are aligned with the wiring grooves 18. The stator support frame does not have U-shaped grooves 19 where the protrusions 18 are located. After the first stator lead wire 16 is connected, it passes through the U-shaped grooves 19 from the inner side of the stator support frame 10 to the outer side of the stator support frame, and then runs along the wiring grooves 18 on the outer wall of the second stator towards the rear. The second stator lead wire 17 runs directly towards the rear. Figure 1 , 2 As shown, the first stator lead 16 and the second stator lead 17 are respectively located on opposite sides inside the motor housing 1. The stator support frame 10 is symmetrically arranged on both sides, with the locking protrusion as the dividing interface, and the number of U-shaped grooves on each side of the stator support frame is not less than 3. The wiring grooves are evenly arranged in the circumferential direction of the second stator, and the total number of wiring grooves on the outer wall of the second stator is not less than 8.

[0026] like Figure 1 , 4As shown, the rear end cover 3 is equipped with a drive gear 12 that moves with the rear end of the rotor shaft 4. A first encoder 13 and a second encoder 14 mesh with each other on either side of the drive gear. The first encoder 13 and the second encoder 14 are respectively equipped with a first magnet and a second magnet that output rotation signals. A brake 11 capable of clamping and braking the rotor shaft is located on the front side of the rear end cover 3. A lead wire connector 15 is located on the rear surface of the rear end cover 3, connecting the first stator lead wire, the second stator lead wire, the first encoder lead wire, the second encoder lead wire, and the brake lead wire.

[0027] This device utilizes a special wiring groove design on the outer wall of the second stator, combined with a U-shaped groove on the rearward-facing stator support frame. This allows the first stator leads to pass through the U-shaped groove and the wiring groove, running along the outer side with one lead per groove, thus creating separation between the leads and preventing wire merging. The second stator leads can run from the opposite side in the circumferential direction. The orderly routing of the first and second stator leads within a limited space, with clear separation, reduces assembly difficulty, lowers wiring error rates, facilitates subsequent use and maintenance, enhances product image, and improves user experience. The encoder also employs a redundant design with dual signal outputs to prevent motor malfunction due to a single encoder failure.

Claims

1. A redundant low-voltage high-speed servo motor, comprising a motor housing, a stator and a rotor disposed inside the motor housing, the rotor being sleeved on a rotor shaft, characterized in that: With the output end of the rotor shaft as the front end, a first rotor and a second rotor are fixedly arranged on the rotor shaft from front to back. A first stator and a second stator are respectively arranged on the outer side of the first rotor and the second rotor. An annular stator support frame is arranged between the first stator and the second stator. Several wiring grooves are opened on the outer wall of the second stator along the front-back direction. Several U-shaped grooves are opened on the stator support frame facing backward. The U-shaped grooves are aligned with the wiring grooves. After the first stator lead wire is connected, it passes through the U-shaped groove from the inner side of the stator support frame to the outer side of the stator support frame, and then runs along the wiring groove on the outer wall of the second stator to the rear end. The second stator lead wire runs directly to the rear end.

2. The redundant low-voltage high-speed servo motor according to claim 1, characterized in that: The first stator and the second stator have the same structure.

3. A redundant low-voltage high-speed servo motor according to claim 1 or 2, characterized in that: The front and rear faces of the stator support frame are respectively provided with positioning protrusions, which are aligned with the wiring grooves. The stator support frame does not have U-shaped grooves at the locations where the protrusions are provided.

4. A redundant low-voltage high-speed servo motor according to claim 1, characterized in that: The first stator lead and the second stator lead are respectively located on opposite sides inside the motor housing.

5. A redundant low-voltage high-speed servo motor according to claim 1, characterized in that: The stator support frame is symmetrically arranged on both sides, and the number of U-shaped grooves on each side of the stator support frame is not less than 3.

6. A redundant low-voltage high-speed servo motor according to claim 1, characterized in that: The wiring channels are evenly arranged in the circumferential direction of the second stator, and the total number of wiring channels is not less than 8.

7. A redundant low-voltage high-speed servo motor according to claim 1, characterized in that: A rotor support frame is provided between the first rotor and the second rotor, and the rotor support frame is sleeved on the outer surface of the rotor shaft.

8. A redundant low-voltage high-speed servo motor according to claim 1, characterized in that: The motor housing includes a rear end cover disposed at the rear end of the motor. The rear end cover is provided with a drive gear that moves with the rear end of the rotor shaft. A first encoder and a second encoder are respectively meshed on both sides of the drive gear. A first magnet and a second magnet that output rotation signals are respectively disposed on the first encoder and the second encoder.

9. A redundant low-voltage high-speed servo motor according to claim 8, characterized in that: A brake capable of clamping and braking the rotor shaft is provided on the front side of the rear end cover.

10. A redundant low-voltage high-speed servo motor according to claim 9, characterized in that: The rear surface of the rear end cover is provided with a lead wire connector, and the first stator lead wire, the second stator lead wire, the first encoder lead wire, the second encoder lead wire, and the brake lead wire are all connected to the lead wire connector.

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