Composite electric spindle with inner rotor and outer rotor

Abstract

The utility model discloses an inner and outer rotor composite motorized spindle, which comprises a core shaft, a spindle shell, and an inner rotor, an inner stator, an outer stator and an outer rotor which are coaxially arranged from inside to outside, the core shaft is rotatably connected with the spindle shell, and a cavity for accommodating the inner rotor, the outer rotor, the inner stator and the outer stator is formed between the core shaft and the spindle shell; the inner stator and the outer stator are arranged on the main shaft shell, and the outer rotor and the inner rotor are arranged on the core shaft. An inner rotor, an inner stator, an outer stator and an outer rotor are arranged between a mandrel and an electric spindle shell, so that an inner rotor motor and an outer rotor motor are arranged in the electric spindle, the two motors are designed according to a high-speed motor and a low-speed motor respectively, and the electric spindle can be switched between high-speed small torque and low-speed large torque; performance parameters of the two sets of motors are mutually independent, dependence and restriction do not exist, and the torque and rotating speed adjusting range is larger.

Description

Technical Field

[0001] The utility model relates to the technical field of numerically controlled machine tools, in particular to an inner and outer rotor composite electric spindle. Background Art

[0002] The electric spindle is a key component in CNC machine tools that controls tool rotation. Its speed and torque are limited by the motor. For the same power, high-speed electric spindles tend to have lower torque, while high-torque electric spindles have relatively lower speeds. To maximize the adaptability of electric spindles, the currently adopted solution is to design the electric spindle motor with a dual-winding design. This means that the stator windings of the electric spindle motor are designed to have both high-speed and low-speed operating modes. This switching mode achieves drive characteristics of high-speed, low-torque and low-speed, high-torque. A specific switching speed threshold is set. When the motor speed falls below this threshold, it operates in low-speed mode, and when the speed exceeds this threshold, it switches to high-speed mode. While this solution broadens the torque and speed range of the electric spindle, the two modes provided by the dual-winding design cannot be arbitrarily combined to define parameters. Comprehensive consideration and balanced matching are required during design. If the electric spindle requires two operating modes with significantly different parameters, a dual-winding solution alone cannot achieve this. Summary of the Invention

[0003] The utility model provides an inner and outer rotor composite electric spindle, which provides an electric spindle that meets the requirements of low speed, high torque and high speed.

[0004] In order to achieve the above purpose, the technical solution of the utility model is:

[0005] An inner-outer rotor composite electric spindle comprises: a core shaft, a spindle housing, and an inner rotor, an inner stator, an outer stator, and an outer rotor coaxially arranged from the inside out, the core shaft and the spindle housing being rotatably connected, and a cavity for accommodating the inner rotor, outer rotor, inner stator, and outer stator being formed between the core shaft and the spindle housing;

[0006] The inner stator and the outer stator are arranged on the main shaft housing, and the outer rotor and the inner rotor are arranged on the core shaft.

[0007] Furthermore, the core shaft includes a tool mounting portion and a rotary shaft, the tool mounting portion is fixed to the end of the rotary shaft, and the inner rotor is sleeved and fixed on the rotary shaft;

[0008] It also includes a support body fixed on the tool mounting portion, and the outer rotor is vertically fixed on the support body.

[0009] Furthermore, a detachable tool handle seat is provided at the front end of the core shaft.

[0010] Furthermore, it also includes a stator cooling jacket fixed on the main shaft housing, the stator cooling jacket is located between the inner stator and the outer stator, and the inner stator and the outer stator are fixed on the stator cooling jacket.

[0011] Furthermore, the spindle housing includes a main body and a front bearing assembly and a rear bearing assembly fixed on the main body, and both ends of the core shaft are rotatably connected to the front bearing assembly and the rear bearing assembly respectively.

[0012] Furthermore, the front bearing assembly includes a front dynamic balancing disc, a front bearing sealing cover, a front bearing pressure cover and a front bearing seat, and the front dynamic balancing disc and the front bearing sealing cover form a labyrinth seal;

[0013] The front dynamic balancing disc is fixed to the front end of the core shaft, the front bearing seat is fixed on the main body, the front bearing sealing cover and the front bearing pressure cover are arranged between the front dynamic balancing disc and the front bearing seat, and the front bearing seat is provided with a front bearing sleeved on the core shaft.

[0014] Furthermore, a ventilation groove is provided on the inner periphery of the front bearing sealing cover, an air inlet hole connected to the ventilation groove is provided on the front bearing sealing cover, an air sealing cover plate is provided inside the front bearing sealing cover, the air sealing cover plate covers the ventilation groove, and the air sealing cover plate is evenly distributed with through holes.

[0015] Furthermore, a front bearing cooling channel is formed between the main body and the front bearing assembly, and a rear bearing cooling channel is formed between the main body and the rear bearing assembly.

[0016] Furthermore, it also includes an angle encoder and a flange set on the core shaft, the angle encoder includes an encoder gear and a reading head set relatively, the encoder gear is set on the flange, and the reading head is set on the main shaft housing.

[0017] Furthermore, the outer stator is sleeved on the outer periphery of the stator cooling jacket, and the outer stator and the stator cooling jacket are interference fit; the stator cooling jacket is sleeved on the outer periphery of the inner stator, and the stator cooling jacket and the inner stator are interference fit.

[0018] Beneficial effects:

[0019] Compared with the existing electric spindle with a dual-winding motor, the utility model provides an inner and outer rotor composite electric spindle, which arranges an inner rotor and an inner stator as well as an outer stator and an outer rotor between the core shaft and the electric spindle housing, so that the electric spindle contains a group of inner rotor motors and a group of outer rotor motors. The two groups of motors are designed as high-speed motors and low-speed motors respectively, so that the electric spindle can switch between high speed and low torque and low speed and high torque. The performance parameters of the two groups of motors are independent of each other, there is no dependence or restriction, and the torque and speed adjustment range is larger. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 This is a schematic structural diagram of an inner and outer rotor composite electric spindle provided by the utility model;

[0022] Figure 2 for Figure 1 A magnified view of point A;

[0023] Figure 3 for Figure 1 Enlarged view of point B;

[0024] Figure 4 for Figure 2 Enlarged view of point C;

[0025] Figure 5 The utility model discloses a schematic structural diagram of a core shaft, an inner rotor and an outer rotor of an inner-outer rotor composite electric spindle.

[0026] In the picture:

[0027] 1. Mandrel; 101. Tool mounting; 102. Rotary axis; 2. Inner rotor; 201. Inner rotor magnet; 202. Inner rotor yoke; 3. Inner stator; 4. Outer stator; 5. Outer rotor; 501. Outer rotor magnet; 502. Outer rotor yoke; 6. Stator cooling jacket; 7. Broaching mechanism; 8. Broaching cylinder; 9. Encoder gear; 10. Reading head; 11. Tool holder; 12. Front bearing cooling channel; 13. Rear bearing cooling channel; 14. Flange; 15. Airtight seal cover; 16. Breathing groove; 17. Front dynamic balancing plate; 18. Front bearing sealing cover; 19. Front bearing pressure cover; 20. Front bearing seat; 21. Front bearing; 22. First locking nut; 23. Inner spacer; 24. Outer spacer; 25. Proximity switch; 26. Bracket; 27. Sealing cover; 28. Rear bearing seat; 29. ​​Rear bearing; 30. Second locking nut; 31. Front flange; 32. Sleeve; 33. Rear seat; 34. Rear cover; 35. Rotary joint; 36. Cutting disc; 37. Bracket; 38. Support body. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0029] This embodiment provides an inner and outer rotor composite electric spindle, such as Figure 1 As shown, it includes: a core shaft 1, a main shaft housing, and an inner rotor 2, an inner stator 3, an outer stator 4, and an outer rotor 5 coaxially arranged from the inside to the outside. The core shaft 1 and the main shaft housing are rotatably connected, and a cavity is formed between the core shaft 1 and the main shaft housing to accommodate the inner rotor 2, the outer rotor 5, the inner stator 3, and the outer stator 4;

[0030] The inner stator 3 and the outer stator 4 are arranged on the main shaft housing, and the outer rotor 5 and the inner rotor 2 are arranged on the core shaft 1. In this embodiment, the outer rotor 5 and the core shaft 1 are fixedly connected by bolts, and the inner rotor 2 and the core shaft 1 are interference fit;

[0031] Compared to existing electric spindles equipped with dual-winding motors, the present embodiment provides an inner-outer rotor composite electric spindle. By arranging an inner rotor 2 and an inner stator 3, as well as an outer stator 4 and an outer rotor 5, between a core shaft 1 and the electric spindle housing, the electric spindle contains one inner rotor motor and one outer rotor motor. The two motors are designed as high-speed motors and low-speed motors, respectively. Through switching control systems, they are controlled individually or through synchronous dual-drive control, enabling the electric spindle to switch between high speed, low torque, and low speed, high torque. The performance parameters of the two motors are independent of each other, without dependence or restriction, and the torque and speed adjustment range is wider.

[0032] The inner rotor motor is located inside the outer rotor motor. The inner rotor motor does not take up extra space in the axial direction of the electric spindle, shortening the length of the electric spindle, making the electric spindle structure more compact and easy to integrate into CNC machine tools.

[0033] In a specific embodiment, Figure 5 As shown, the core shaft 1 includes a tool mounting portion 101 and a rotary shaft 102. The tool mounting portion 101 is fixed to the end of the rotary shaft 102. In this embodiment, the tool mounting portion 101 and the rotary shaft 102 are integrally formed.

[0034] The inner rotor 2 includes an inner rotor magnet 201 and an inner rotor yoke 202. The inner rotor magnet 201 is fixed to the inner rotor yoke 202. The inner rotor yoke 202 is sleeved on the rotating shaft 102. The inner rotor yoke 202 and the rotating shaft 102 have an interference fit.

[0035] It also includes a support body 38 fixed to the tool mounting portion 101 by bolts, and the outer rotor 5 includes an outer rotor magnet 501 and an outer rotor yoke 502. The outer rotor magnet 501 is fixed on the outer rotor yoke 502, and the outer rotor yoke 502 is vertically fixed to the end of the support body 38. The support body 38 allows a space to be formed between the outer rotor 5 and the rotating shaft 102 to accommodate the inner rotor 2, the inner stator 3 and the outer stator 4. In this embodiment, the outer rotor yoke 502 and the support body 38 are formed as one piece.

[0036] In a specific embodiment, Figure 1 As shown, a detachable tool handle seat 11 is provided at the front end of the core shaft 1. The tool handle seat 11 is used to accommodate the tool handle of the tool. In this embodiment, the tool handle seat 11 is connected to the tool mounting portion 101 of the core shaft 1 by bolts. By replacing the tool handle seat 11, tools of different sizes can be adapted.

[0037] In a specific embodiment, the spindle housing includes a main body and a front bearing assembly and a rear bearing assembly fixed to the main body, and both ends of the core shaft 1 are rotatably connected to the front bearing assembly and the rear bearing assembly respectively;

[0038] In this embodiment, if Figure 1 As shown, the main body includes a front flange 31, a sleeve 32, a rear seat 33 and a rear cover 34 connected to each other by bolts to facilitate the disassembly and assembly of the electric spindle;

[0039] like Figure 2 As shown, the front bearing assembly includes a front dynamic balancing disc 17, a front bearing sealing cover 18, a front bearing pressure cover 19 and a front bearing seat 20. The front dynamic balancing disc 17 and the front bearing sealing cover 18 form a labyrinth seal;

[0040] The front dynamic balancing disc 17 is fixed to the front end of the core shaft 1 by bolts, and the front bearing seat 20 is fixed to the front flange 31 by bolts. The front bearing sealing cover 18 and the front bearing pressure cover 19 are arranged between the front dynamic balancing disc 17 and the front bearing seat 20. The front bearing sealing cover 18 and the front bearing pressure cover 19 are fixed to the front bearing seat 20 by bolts. The front bearing seat 20 is provided with a front bearing 21 sleeved on the core shaft 1. The front bearing seat 20 is rotatably connected to the tool mounting portion 101 of the core shaft 1 through the front bearing 21. A first locking nut 22 is sleeved on the core shaft 1 to limit the axial position of the front bearing 21. An inner spacer 23 and an outer spacer 24 are provided between the two front bearings 21 to ensure the axial positioning of the front bearing 21;

[0041] like Figure 3As shown, the rear bearing assembly includes a sealing cover 27 and a rear bearing seat 28. The rear bearing seat 28 is provided with a rear bearing 29 sleeved on the core shaft 1. The rear bearing seat 28 is rotatably connected to the rotating shaft 102 of the core shaft 1 through the rear bearing 29. A second locking nut 30 is sleeved on the core shaft 1 to limit the axial position of the rear bearing 29.

[0042] In a specific embodiment, Figure 1 As shown, it also includes a stator cooling jacket 6 fixed on the rear seat 33. The stator cooling jacket 6 is located between the inner stator 3 and the outer stator 4. The inner stator 3 and the outer stator 4 are fixed on the stator cooling jacket 6. In this embodiment, the inner stator 3 and the outer stator 4 are both interference fit with the stator cooling jacket 6. A coolant channel communicating with the stator cooling jacket is provided on the rear seat 33. The stator cooling jacket 6 is connected to the external cooling system through the coolant channel.

[0043] In a specific embodiment, Figure 4 As shown, a vent groove 16 is provided on the inner periphery of the front bearing sealing cover 18, an air inlet hole communicating with the vent groove 16 is provided on the front bearing sealing cover 18, an air sealing cover plate 15 is provided inside the front bearing sealing cover 18, the air sealing cover plate 15 covers the vent groove 16, and through holes are evenly distributed on the air sealing cover plate 15 to facilitate uniform air discharge;

[0044] The ventilation groove 16 is connected to the air source through the air inlet hole, and the air sealing cover 15 and the front bearing sealing cover 18 are interference fit. The air source introduces compressed air into the ventilation groove 16 through the air inlet hole. The compressed air flows along the circumferential direction of the ventilation groove 16 and is evenly discharged through the through holes evenly distributed on the air sealing cover 15, ensuring that the inside of the labyrinth seal maintains positive pressure and uniform pressure, forming an airtight seal. The labyrinth seal and the air seal form double protection to prevent impurities such as cutting chips and dust from entering the electric spindle.

[0045] In a specific embodiment, Figure 2 As shown, a front bearing cooling channel 12 is formed between the front flange 31 and the front bearing assembly. Figure 3 As shown, a rear bearing cooling channel 13 is formed between the rear seat 33 and the rear bearing assembly.

[0046] The front flange 31 is provided with a coolant channel connected to the front bearing cooling channel 12, and the front bearing cooling channel 12 is connected to the external cooling system through the coolant channel;

[0047] The rear seat 33 is provided with a coolant channel connected to the rear bearing cooling channel 13 , and the rear bearing cooling channel 13 is connected to the external cooling system through the coolant channel.

[0048] In a specific embodiment, Figure 3As shown, it also includes an angle encoder and a flange 14 arranged on the core shaft 1. The angle encoder includes an encoder gear 9 and a reading head 10 arranged relatively to each other. The encoder gear 9 is arranged on the flange 14. The flange 14 is fixed to the rotating shaft 102 of the core shaft 1 by bolts to provide a mounting base for the encoder gear 9. The reading head 10 is fixed to the rear bearing seat 28 by bolts.

[0049] In a specific embodiment, Figure 1 As shown, it also includes a broaching mechanism 7 and a beating cylinder 8. The broaching mechanism includes a coaxial arrangement in the core shaft 1, the beating cylinder 8 is fixed on the rear cover 34, the beating cylinder 8 is connected to the tail end of the pull rod of the broaching mechanism 7, and the other end of the pull rod is provided with a pulling claw, which is driven by the beating cylinder 8 to move the pull rod axially. When the pull rod moves axially, the pulling claw is driven to contract or expand. A beating disc 13 is provided on the pull rod, and three proximity switches 25 are provided in the spindle housing along the axial direction of the core shaft 1 to confirm the state of the broaching mechanism 7 by detecting the position of the beating disc 13 (the three proximity switches 25 are used to detect the three states of broaching, loosening the knife and clamping without a knife).

[0050] In this embodiment, if Figure 1 As shown, the proximity switch 25 is fixed on a bracket 37, and the bracket 37 is fixed on the rear seat 33. There are three brackets 37 fixed on the rear seat 33, which are used to fix three proximity switches 25 respectively. Figure 1 Only one bracket 37 and one proximity switch 25 are drawn for illustration. In actual application, three brackets 37 are arranged circumferentially around the core shaft 1. The three proximity switches 25 fixed on the three brackets 37 have different distances from the rear seat 33 along the axial direction of the core shaft 1 to respectively detect the three states of broaching, loosening the tool and clamping without a tool.

[0051] In a specific embodiment, Figure 1 As shown, it also includes a rotary joint 35, which includes a rotary joint seat and a rotary joint rod. The rotary joint seat is fixed on the knife cylinder 8. The knife cylinder 8 is hollow inside and is sleeved on the rotary joint seat. One end of the rotary joint rod is rotatably connected to the rotary joint seat, and the other end is inserted into the pull rod and sealed by a sealing ring to provide coolant to the pull rod.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An inner and outer rotor composite electric spindle, characterized in that: include: A core shaft (1), a main shaft housing, and an inner rotor (2), an inner stator (3), an outer stator (4), and an outer rotor (5) coaxially arranged from the inside to the outside, wherein the core shaft (1) and the main shaft housing are rotatably connected, and a cavity for accommodating the inner rotor (2), the outer rotor (5), the inner stator (3), and the outer stator (4) is formed between the core shaft (1) and the main shaft housing; The inner stator (3) and the outer stator (4) are arranged on the main shaft housing, and the outer rotor (5) and the inner rotor (2) are arranged on the core shaft (1).

2. The inner and outer rotor composite electric spindle according to claim 1, characterized in that: The core shaft (1) comprises a tool mounting portion (101) and a rotary shaft (102), wherein the tool mounting portion (101) is fixed to the end of the rotary shaft (102), and the inner rotor (2) is sleeved and fixed on the rotary shaft (102); It also includes a support body (25) fixed on the tool mounting portion (101), and the outer rotor (5) is vertically fixed on the support body (25).

3. The inner and outer rotor composite electric spindle according to claim 1, characterized in that: The front end of the core shaft (1) is provided with a detachable tool handle seat (11).

4. The inner and outer rotor composite electric spindle according to claim 1, characterized in that: It also includes a stator cooling jacket (6) fixed on the main shaft housing, the stator cooling jacket (6) is located between the inner stator (3) and the outer stator (4), and the inner stator (3) and the outer stator (4) are fixed on the stator cooling jacket (6).

5. The inner and outer rotor composite electric spindle according to claim 1, characterized in that: The main shaft housing comprises a main body and a front bearing assembly and a rear bearing assembly fixed on the main body, and the two ends of the core shaft (1) are rotatably connected to the front bearing assembly and the rear bearing assembly respectively.

6. The inner and outer rotor composite electric spindle according to claim 5, characterized in that: The front bearing assembly comprises a front dynamic balancing disc (17), a front bearing sealing cover (18), a front bearing pressure cover (19) and a front bearing seat (20), wherein the front dynamic balancing disc (17) and the front bearing sealing cover (18) form a labyrinth seal; The front dynamic balancing disc (17) is fixed to the front end of the core shaft (1), the front bearing seat (20) is fixed to the main body, the front bearing sealing cover (18) and the front bearing pressure cover (19) are arranged between the front dynamic balancing disc (17) and the front bearing seat (20), and the front bearing seat (20) is provided with a front bearing (21) sleeved on the core shaft (1).

7. The inner and outer rotor composite electric spindle according to claim 6, characterized in that: A ventilation groove (16) is provided on the inner periphery of the front bearing sealing cover (18), an air inlet hole communicating with the ventilation groove (16) is provided on the front bearing sealing cover (18), an air sealing cover plate (15) is provided inside the front bearing sealing cover (18), the air sealing cover plate (15) covers the ventilation groove (16), and the air sealing cover plate (15) is uniformly distributed with through holes.

8. The inner and outer rotor composite electric spindle according to claim 5, characterized in that: A front bearing cooling channel (12) is formed between the main body and the front bearing assembly, and a rear bearing cooling channel (13) is formed between the main body and the rear bearing assembly.

9. The inner and outer rotor composite electric spindle according to claim 1, characterized in that: It also includes an angle encoder and a flange (14) arranged on the core shaft (1), the angle encoder includes an encoder gear (9) and a reading head (10) arranged opposite to each other, the encoder gear (9) is arranged on the flange (14), and the reading head (10) is arranged on the spindle housing.

10. The inner and outer rotor composite electric spindle according to claim 4, characterized in that: The outer stator (4) is sleeved on the outer periphery of the stator cooling sleeve (6), and the outer stator (4) and the stator cooling sleeve (6) are interference-fitted; the stator cooling sleeve (6) is sleeved on the outer periphery of the inner stator (3), and the stator cooling sleeve (6) and the inner stator (3) are interference-fitted.

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