An embedded turntable bearing direct drive motor
By designing an embedded rotary table bearing direct drive motor, using the combination of rotary table bearings and rotation monitoring parts, the existing DD direct drive motor has solved the problem of large size and heavy mass in the field of CNC machine tool turntables, achieving high-precision transmission and large load bearing capacity, which is suitable for industrial applications with small spaces.
Patent Information
- Application Number
- CN202420542663.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-03-20
AI Technical Summary
The existing DD direct drive motors are huge in the field of CNC machine tool turntables, which leads to the need to reduce the effective working stroke of the machine tool in the case of small space, weakening the high-precision advantages of the motor. At the same time, users have a concept of the inherent lack of rigidity of traditional DD motors, which affects their use in industrial applications.
An embedded rotary table bearing direct drive motor is designed. By setting the rotary table bearing parts and rotation monitoring parts inside the motor, the axial and radial bearing capacity of the bearing is used to increase multiple rotary dynamic seals and static seals, and combined with a high-precision hollow rotary encoder, high-precision transmission and large load bearing capacity are achieved.
It realizes the high-precision transmission of the motor, small size, high rigidity and high power density, and can be used under large overturning torque conditions, maintaining the accuracy and rigidity unchanged for a long time, significantly improving the performance in the industrial transmission field.
Smart Images
Figure CN222735947U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of rotation of a turntable bearing direct-drive motor, and more specifically, to an embedded turntable bearing direct-drive motor. Background Art
[0002] As a high-precision rotary transmission mechanism, DD motor direct drive motor is widely used in various occasions requiring precise rotation and high rigidity support due to its unique advantages such as low speed and high torque, high precision, high response speed and low loss. The embedded turntable bearing direct drive motor is a motor composed of a flat stator and rotor, an embedded turntable bearing, a high-precision encoder and a connector. In this way, the direct drive motor can not only ensure high-precision transmission but also withstand large axial force and radial force, so that the motor can be used in occasions with large overturning torque conditions. At present, the DD direct drive motors on the market have been widely used in the field of CNC machine tool turntables. The occasions require that the motor must have high torque, high rigidity, high precision and other requirements. In order to meet these requirements, the traditional DD motor must increase the external dimensions of the stator and rotor inside the motor to meet the requirements. As a result, the DD motors on the market are currently large in size and heavy in weight, which makes it necessary to reduce the effective working stroke of the machine tool in many cases where the internal space of the machine tool is small, and also weakens the high precision advantage of the motor itself. In addition, users' perception of the inherent lack of rigidity of traditional DD motors has made DD motors even more overshadowed in industrial applications. In order to improve the above shortcomings of DD motors, our company has developed an embedded turntable bearing direct-drive motor, which uses the good axial and radial bearing capacity of the bearing itself, and adds multiple rotating dynamic seals and static seals between the connecting parts, so that the motor has the advantages of bearing large loads, high rigidity, and high protection. In addition, a high-precision hollow rotary encoder is added to enable it to obtain higher precision transmission and hollow oil, liquid, gas and other medium transmission. The above measures have greatly improved the performance requirements of embedded turntable bearing direct-drive motors in the field of industrial transmission. Utility Model Content
[0003] In order to overcome the above defects, the utility model provides an embedded turntable bearing direct drive motor, which specifically adopts the following technical solutions:
[0004] An embedded turntable bearing direct drive motor, comprising:
[0005] A power part, which provides rotational power to output work externally;
[0006] A turntable bearing member, which is arranged on the power member to improve the stability of the power member during the outward rotation and work process;
[0007] The rotation monitoring component is arranged on the power component, monitors the rotation data of the power component in real time, and controls the power component through the connected driver.
[0008] Preferably, the power member comprises a motor housing, a stator member and a rotor member, the stator member and the rotor member are both arranged in the motor housing, and the rotor member is driven in the circumferential direction in the stator member to output work outward.
[0009] Preferably, the outer ring of the stator component is coated with glue and then pressed into the inner cavity of the motor housing by a first tooling device, and the rotor component is rotatably embedded in the stator component and rotates circumferentially to output work.
[0010] Preferably, the turntable bearing member includes a turntable front end bearing member and a turntable rear end bearing member, and the turntable front end bearing member and the turntable rear end bearing member are both arranged on the motor housing to provide support for the circumferential rotation and axial locking of the rotor member.
[0011] Preferably, the bearing component at the front end of the turntable includes a first rotating seal and a turntable bearing, the first rotating seal is arranged between the motor housing and the rotor component to provide a rotating sealing connection between the motor housing and the rotor component; the outer ring of the turntable bearing is connected to the motor housing, and the inner ring of the turntable bearing is connected to the rotor component to provide radial support and axial support for the rotating rotor component.
[0012] Preferably, the rear end bearing member of the turntable includes a support bearing and a preload wave pad, the support bearing is sleeved on the rotor member, and the support bearing is embedded in the motor end cover of the motor housing, and the preload wave pad is embedded in the inner ring of the motor end cover to adjust the axial tolerance preload.
[0013] Preferably, the rotation monitoring component comprises a monitoring support and an encoder, wherein the monitoring support provides support on the motor housing, and the encoder monitors rotation data of the rotor component on the monitoring support.
[0014] Preferably, the monitoring support member includes an inner ring support frame and an outer ring support frame, the inner ring support frame moves on the rotor member, and the outer ring support frame is on the motor end cover; the rotating part of the encoder moves on the inner ring support frame, and the non-rotating part of the encoder is on the outer ring support frame, so as to monitor the rotation data of the rotor member in real time.
[0015] Preferably, an encoder cover of the encoder is fastened to the motor end cover, and a second rotating seal is provided between an inner ring of the encoder cover and the rotor component.
[0016] Preferably, an output cable is provided on the motor end cover, and an end of the output cable is electrically connected to the driver.
[0017] The utility model at least has the following beneficial effects:
[0018] 1) The utility model has the advantages of high transmission precision, small size, high rigidity, high power density and convenient use of the built-in turntable bearing direct-drive motor;
[0019] 2) The output end of the rotating part of the embedded turntable bearing direct-drive motor of the utility model adopts a cylindrical roller and bidirectional thrust needle roller combined bearing made by our company, namely an embedded turntable bearing. The embedded turntable bearing can withstand both axial force and radial force, so that the embedded turntable bearing direct-drive motor has a large load-bearing torque and can be used under large overturning torque conditions and maintain accuracy and rigidity for a long time; the client installation stop directly uses the outer circle and end face of the embedded turntable bearing as the positioning reference surface, and the positioning reference surface is processed by external cylindrical grinding and double end face precision grinding, and the grinding accuracy can reach within 0.002, which effectively ensures that the installation axis is highly coaxial with the motor rotation axis, and realizes high-precision transmission;
[0020] 3) The embedded turntable bearing used in the embedded turntable bearing direct-drive motor of the utility model has the advantages of multi-layer protection and good self-sealing performance; currently, conventional turntable bearings on the market generally do not have self-sealing performance, and grease and external impurities during user use require additional multiple rotating dynamic seals and static seals to be set on the outside, which greatly increases the design and manufacturing cost and the volume of the equipment itself. The embedded turntable bearing used in the embedded turntable bearing direct-drive motor takes internal and external sealing protection into consideration and successfully applies it at the beginning of design and manufacturing. In addition, the integrated design with the motor makes it possible to add rotating dynamic seals and static seals between each internal and external connecting parts, thereby significantly improving the protection level, reducing the volume, and significantly improving the convenience of client installation;
[0021] 4) The rotor of the embedded turntable bearing direct-drive motor of the utility model is designed and manufactured with a hollow hole, which is convenient for the client to directly route the wires and ventilate the inside of the motor, and realize the simple and convenient interaction between the motor and other external media. It improves the problems of many cables being tangled and occupying too much space caused by the external wiring of the traditional solid shaft servo motor used in turntable and other working conditions, and provides a practical solution for realizing the small overall size and simple portability of the equipment;
[0022] 5) The utility model embedded turntable bearing direct drive motor is equipped with a high-precision rotary circular grating encoder. The encoder itself is thin and strong, and the appearance adopts a glue-filling process. Its absolute accuracy can reach up to ±3 arc seconds, and the repeatability is ±1.5 arc seconds. At the same time, it is compatible with BISS-C, SSI, incremental and other protocol interfaces, which makes it widely adaptable to users. One end of the rotor is directly connected to the high-precision encoder, and the other end is directly connected to the load. The encoder accuracy represents the output end accuracy, thereby realizing high-precision transmission of the motor;
[0023] 6) The stator of the embedded turntable bearing direct-drive motor of the utility model adopts an integral punching sheet, and the winding coil is made flat, which greatly reduces the volume; the coil and the punching sheet are wrapped with epoxy resin and insulating pads, and the mature insulating varnishing process is used. Therefore, compared with the same motors on the market, the motor has good electrical insulation, high power density ratio, light weight and short overall length.
[0024] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model's embedded turntable bearing direct-drive motor;
[0026] Figure 2 It is a longitudinal sectional front view of the embedded turntable bearing direct drive motor of the utility model;
[0027] Figure 3 It is a schematic diagram of the longitudinal sectional three-dimensional structure of the embedded turntable bearing direct-drive motor of the utility model.
[0028] Among them: 1-motor housing, 2-motor end cover, 3-stator part, 4-rotor part, 5-first O-ring, 6-first rotating seal, 7-turntable bearing, 8-first screw, 9-support bearing, 10-pre-tightening wave pad, 11-monitoring support, 12-encoder, 13-encoder cover, 14-second rotating seal, 15-output cable, 16-cable waterproof connector. DETAILED DESCRIPTION
[0029] The following will describe the technical solution of the present invention in detail by way of embodiments with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.
[0030] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship.
[0031] according to Figure 1-Figure 3 As shown, an embedded turntable bearing direct drive motor includes a power part, a turntable bearing part and a rotation monitoring part, and the turntable bearing part and the rotation monitoring part are both arranged on the power part. The power part includes a motor housing, a stator part 3 and a rotor part 4, and the stator part 3 and the rotor part 4 are both arranged on the motor housing.
[0032] The motor housing includes a motor housing 1 and a motor end cover 2, and the motor end cover 2 is arranged on the motor housing 1. After the outer ring of the stator component 3 is coated with glue, the stator component 3 is pressed into the inner cavity of the motor housing 1 using a first tooling device and left to stand for 4 hours to wait for the glue to dry. The rotor component 4 is rotatably embedded in the stator component 3 and is circumferentially rotated to output work. Furthermore, a first O-ring 5 coated with butter is installed in the first sealing groove of the left port of the motor housing 1.
[0033] The turntable bearing member includes a turntable front end bearing member and a turntable rear end bearing member, and the turntable front end bearing member and the turntable rear end bearing member are both arranged on the motor housing. The turntable front end bearing member includes a first rotary seal 6 and a turntable bearing 7, and the first rotary seal 6 and the turntable bearing 7 are both arranged in the motor housing 1. Specifically, after the outer ring of the first rotary seal 6 is coated with sealant, its lip is installed into the inner hole at the left end of the motor housing 1 with the second tooling device facing outward. One end face of the bearing outer ring of the turntable bearing 7 is fastened to the left port of the motor housing 1 by the first screw 8, and the static seal between the turntable bearing 7 and the motor housing 1 is maintained by the first O-ring 5. The turntable bearing 7 is sleeved on the left end of the rotor member 4, and the bearing inner ring of the turntable bearing 7 is fastened to the left end of the rotor member 4 by the second screw. Further, a rotary seal ring is arranged between the bearing outer ring of the turntable bearing 7 and the rotor member 4. Further, the turntable bearing 7 is an embedded turntable bearing.
[0034] Furthermore, the installation process of the rotor component 4 is to first apply yellow grease to the inner diameter lip of the first rotating seal 6 for lubrication, and then install the rotor component 4 with the magnetic steel sheet pre-attached as a whole into the turntable bearing 7, and fasten the rotor component 4 and the inner ring of the turntable bearing 7 with the second screw.
[0035] The bearing component at the rear end of the turntable includes a support bearing 9 and a preload wave pad 10. The support bearing 9 is mounted on the right end of the rotor component 4, and the support bearing 9 is embedded in the inner ring of the motor end cover 2. The preload wave pad 10 is embedded in the inner ring of the motor end cover to adjust the axial tolerance preload.
[0036] Furthermore, the installation process of the bearing member at the rear end of the turntable is as follows: first, the support bearing is pressed into the bearing stop at the right end of the rotor member 4 through the third tooling device; then, the preload wave pad 10 is placed into the bearing inner hole of the motor end cover 2, and then the motor end cover 2 is installed as a whole on the right end of the motor housing 1, and the motor end cover 2 is fastened to the motor housing 1 through the third screw. Furthermore, a second O-ring coated with yellow grease is installed in the second sealing groove on the left port of the motor end cover 2 to provide a static seal between the motor end cover 2 and the motor housing 1.
[0037] The rotation monitoring component includes a monitoring support 11 and an encoder 12. The monitoring support 11 is arranged on the motor housing, and the encoder 12 is arranged on the monitoring support 11. The monitoring support 11 includes an inner ring support frame and an outer ring support frame. The inner ring support frame is fixedly mounted on the right end of the rotor component 4 and moves with it, and the outer ring support frame is fixedly arranged on the motor end cover 2. The rotating part of the encoder 12 is fixedly arranged on the inner ring support frame and moves with it, and the non-rotating part of the encoder 12 is fixedly arranged on the outer ring support frame to monitor the rotation data of the rotor component 4 in real time. Further, the encoder 12 is a high-precision encoder.
[0038] The encoder cover 13 of the encoder 12 is fastened to the motor end cover 2 by a fourth screw, and a third O-ring is provided between the encoder cover 13 and the motor end cover 2 to achieve static sealing between the encoder cover 13 and the motor end cover 2. A second rotating seal 14 is provided between the inner ring of the encoder cover 13 and the rotor member 4. Further, the outer ring of the second rotating seal 14 is coated with sealant, and then the inner ring of the second rotating seal 14 is coated with yellow grease, and then the lip of the second rotating seal 14 is installed into the inner cavity of the encoder cover 13 with the fourth tooling device facing outward.
[0039] Furthermore, the motor end cover 2 is provided with an output cable 15, and the output cable 15 is provided with a cable waterproof connector 16 at the point where it passes through the encoder cover 13. The end of the output cable 15 is welded by a soldering iron and then connected to the driver, and an aging test is performed according to the standard.
[0040] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.
Claims
1. An embedded turntable bearing direct drive motor, characterized in that: include: A power part, which provides rotational power to output work externally; A turntable bearing member, which is arranged on the power member to improve the stability of the power member during the outward rotation and work process; The rotation monitoring component is arranged on the power component, monitors the rotation data of the power component in real time, and controls the power component through the connected driver.
2. The embedded turntable bearing direct drive motor according to claim 1, characterized in that: The power component includes a motor housing, a stator component and a rotor component. The stator component and the rotor component are both arranged in the motor housing, and the rotor component is driven in the circumferential direction in the stator component to output work outward.
3. The embedded turntable bearing direct drive motor according to claim 2, characterized in that: The outer ring of the stator component is coated with glue and pressed into the inner cavity of the motor housing through a first tooling device. The rotor component is rotatably embedded in the stator component and rotates circumferentially to output work.
4. The embedded turntable bearing direct drive motor according to claim 2 or 3, characterized in that: The turntable bearing member includes a turntable front end bearing member and a turntable rear end bearing member, and the turntable front end bearing member and the turntable rear end bearing member are both arranged on the motor housing to provide support for the circumferential rotation and axial locking of the rotor member.
5. The embedded turntable bearing direct drive motor according to claim 4, characterized in that: The bearing component at the front end of the turntable includes a first rotating seal component and a turntable bearing. The first rotating seal component is arranged between the motor housing and the rotor component to provide a rotating sealing connection between the motor housing and the rotor component. The outer ring of the turntable bearing is connected to the motor housing, and the inner ring of the turntable bearing is connected to the rotor component to provide radial support and axial support for the rotating rotor component.
6. The embedded turntable bearing direct drive motor according to claim 4, characterized in that: The bearing component at the rear end of the turntable includes a support bearing and a preload wave pad. The support bearing is sleeved on the rotor component and embedded in the motor end cover of the motor housing. The preload wave pad is embedded in the inner ring of the motor end cover to adjust the axial tolerance preload.
7. The embedded turntable bearing direct drive motor according to claim 6, characterized in that: The rotation monitoring component includes a monitoring support component and an encoder. The monitoring support component provides support on the motor housing, and the encoder monitors rotation data of the rotor component on the monitoring support component.
8. The embedded turntable bearing direct drive motor according to claim 7, characterized in that: The monitoring support member includes an inner ring support frame and an outer ring support frame, the inner ring support frame moves on the rotor member, and the outer ring support frame is on the motor end cover; the rotating part of the encoder moves on the inner ring support frame, and the non-rotating part of the encoder is on the outer ring support frame, so as to monitor the rotation data of the rotor member in real time.
9. The embedded turntable bearing direct drive motor according to claim 8, characterized in that: The encoder cover of the encoder is fastened to the motor end cover, and a second rotating seal is arranged between the inner ring of the encoder cover and the rotor component.
10. The embedded turntable bearing direct drive motor according to claim 6, characterized in that: An output cable is arranged on the motor end cover, and an end of the output cable is electrically connected to the driver.