Annular ultrathin high-precision hollow motor

Abstract

The utility model is applicable to the technical field of ultrasonic motors, and provides an annular ultrathin high-precision hollow motor, which mainly comprises a motor structure for driving and a feedback structure for closed loop feedback, and the motor structure comprises a stator assembly and a rotor which can rotate relatively; the feedback structure comprises a driving gear and a driven gear which are meshed with each other, the driving gear is fixedly connected with the rotor, the driven gear is meshed with one side of the driving gear, and a rotating shaft of the driving gear is parallel to a rotating shaft of the driven gear. A gear meshing structure between the driving gear and the driven gear is used as a closed-loop feedback structure which is not coaxial with a motor structure and is transferred to a position of a shaft parallel to the motor structure, the thickness of the whole hollow motor is reduced, and the hollow motor can meet the production requirement of the existing thinner equipment structure; the gear meshing structure is only used for transmitting feedback but not transmitting torque, the feedback structure is hardly abraded, and the precision of the motor is not reduced. And the later maintenance cost is greatly reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic motors, and specifically relates to an annular ultra-thin high-precision hollow motor. Background Art

[0002] The motor mechanism in the prior art is usually a closed-loop feedback structure and a coaxial arrangement of the motor. Although this configuration can provide accurate feedback, it also increases the axial size of the motor, which results in a thicker motor structure. The motor is large in size and is not suitable for use in thinner equipment structures with strict space requirements; at the same time, a larger motor structure may mean higher material and manufacturing costs. Therefore, the prior art has defects. Utility Model Content

[0003] The utility model aims to overcome the above-mentioned deficiencies of the prior art and provides a ring-shaped ultra-thin high-precision hollow motor.

[0004] The utility model is implemented as follows: a ring-shaped ultra-thin high-precision hollow motor, comprising:

[0005] The motor structure includes a stator assembly and a rotor that can rotate relative to each other;

[0006] The feedback structure comprises a driving gear and a driven gear meshing with each other, wherein the driving gear is fixedly connected to the rotor, the driven gear meshes with one side of the driving gear, and the rotating shaft of the driving gear is parallel to the rotating shaft of the driven gear.

[0007] Furthermore, the motor structure and the feedback structure are connected by a mounting flange, and the mounting flange includes a first mounting portion for fixing the motor structure and a second mounting portion for fixing the feedback structure.

[0008] Furthermore, the first mounting portion includes a first through hole, the stator assembly is fixed to the first mounting portion and surrounds the first through hole, a first bearing is provided in the first through hole, the stator assembly is provided on the outer ring of the first bearing, and the rotor is matched with the stator assembly and fixed to the inner ring of the first bearing.

[0009] Furthermore, a locking member is provided for limiting the rotor and the first bearing. The locking member includes a locking ring and a preload ring. The locking ring and the preload ring are combined and fixed to the inner ring of the first bearing. The locking ring is fixed to the rotor.

[0010] Furthermore, the second mounting portion includes a second through hole, the second through hole is located on the side of the first through hole, a second bearing is arranged in the second through hole, a rotating rod is arranged at the rotating shaft position of the driven gear, and the rotating rod is fixed to the inner ring of the second bearing.

[0011] Furthermore, the number of teeth of the driving gear is at least 8 times the number of teeth of the driven gear.

[0012] The utility model provides an annular ultra-thin high-precision hollow motor, which adopts a gear meshing structure between a driving gear and a driven gear as a closed-loop feedback structure. The entire feedback structure is not coaxial with the motor structure and is transferred to a position parallel to the motor structure, thereby reducing the thickness of the entire hollow motor and meeting the production requirements of thinner equipment structures. Furthermore, since the parallel gear meshing structures are only used to transmit feedback but not torque, the feedback structure is hardly worn, greatly reducing the subsequent maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0015] Figure 1 It is a structural schematic diagram provided by the utility model.

[0016] Figure 2 It is a schematic diagram of a structural explosion provided by the utility model.

[0017] Explanation of the accompanying drawings: 1. Motor structure; 11. Stator assembly; 12. Rotor; 2. Feedback structure; 21. Driving gear; 22. Driven gear; 23. Rotating rod; 3. Mounting flange; 31. First mounting portion; 32. Second mounting portion; 33. First through hole; 34. First bearing; 35. Locking ring; 36. Preload ring; 37. Second through hole, 38. Second bearing. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] See also Figure 1-Figure 2 , which is a ring-shaped ultra-thin high-precision hollow motor disclosed in the utility model, mainly includes a motor structure 1 for driving and a feedback structure 2 for closed-loop feedback.

[0020] The motor structure 1 includes a stator assembly 11 and a rotor 12 that can rotate relative to each other. The stator assembly 11 is usually composed of an elastic ring, a piezoelectric ceramic ring, and an elastic metal ring with convex teeth bonded thereto, while the rotor 12 is composed of a rotating ring and a friction material. The piezoelectric ceramic ring will vibrate when an alternating voltage of ultrasonic frequency is applied, and these vibrations are transmitted and amplified through the convex teeth of the stator, thereby generating sufficient friction between the stator assembly 11 and the rotor 12 to drive the rotor 12 to move. The principle of relative rotation between the stator assembly 11 and the rotor 12 is a prior art and will not be further elaborated in this embodiment.

[0021] The feedback structure 2 includes a driving gear 21 and a driven gear 22 that mesh with each other, and the driving gear 21 is fixedly connected to the rotor 12. When the rotor 12 is driven to rotate by generating mechanical energy through the friction between the rotor 12 and the stator assembly 11, the rotor 12 drives the driving gear 21 to rotate, and the driving gear 21 drives the driven gear 22 to rotate. The rotation information of the rotor 12 is fed back through the rotation of the driven gear 22 to monitor the position and speed of the rotor 12 in real time, compare with the expected set value, and adjust the control signal according to the deviation, so as to achieve more precise motion control. The meshing structure between the driving gear 21 and the driven gear 22 is only used to transmit feedback but not torque, and it will hardly wear out, which greatly reduces the cost of subsequent maintenance. The driven gear 22 meshes with one side of the driving gear 21, the rotating axis of the driving gear 21 is parallel to the rotating axis of the driven gear 22, and the rotor 12 is coaxially arranged with the driving gear 21, so that the entire feedback structure 2 and the motor structure 1 are non-coaxially arranged, and the closed-loop feedback is transferred to the parallel axis position of the motor structure 1, which greatly reduces and increases the axial size of the entire hollow motor, thereby reducing the thickness of the entire hollow motor, and can meet the current production requirements of thinner equipment structures.

[0022] Among them, the matching clearance between the driving gear 21 and the driven gear 22 can be regarded as a constant a. By bringing the constant a into the precise control, precise control can be achieved. In addition, the accuracy can be improved by adjusting the tooth ratio between the driving gear 21 and the driven gear 22. In this embodiment, the number of teeth of the driving gear 21 is more than 8 times the number of teeth of the driven gear 22, which can improve the actual control accuracy by more than 3 bits. While reducing the thickness of the entire hollow motor, the control accuracy can also be improved. This hollow motor can be used as a low-cost and high-precision servo control solution.

[0023] The motor structure 1 and the feedback structure 2 are specifically connected by a mounting flange 3, and the mounting flange 3 includes a first mounting portion 31 for fixing the motor structure 1 and a second mounting portion 32 for fixing the feedback structure 2. The first mounting portion 31 includes a first through hole 33, the stator assembly 11 is fixed to the first mounting portion 31 and surrounds the first through hole 33, a first bearing 34 is arranged in the first through hole 33, the stator assembly 11 is arranged on the outer ring of the first bearing 34, and the rotor 12 is matched with the stator assembly 11 and fixed to the inner ring of the first bearing 34. In specific applications, the moving parts of the equipment are directly fixed to the inner ring of the first bearing 34. When the rotor 12 rotates, it can drive the inner ring of the first bearing 34 to rotate, and can drive the moving parts of the equipment to operate smoothly. In addition, since the bearing structure does not have any mechanical connection structure, a locking member is also provided to fix the rotor 12 and the first bearing 34. The locking member includes a locking ring 35 and a preload ring 36. The locking ring 35 and the preload ring 36 are combined and fixed to the inner ring of the first bearing 34, and the locking ring 35 is fixed to the rotor 12.

[0024] The second mounting portion 32 includes a second through hole, which is located on the side of the first through hole 33. A second bearing is provided in the second through hole. A rotating rod 23 is provided at the rotating axis position of the driven gear 22. The rotating rod 23 is fixed to the inner ring of the second bearing. The driven gear 22 can rotate smoothly with the cooperation of the rotating rod 23 and the second bearing to smoothly realize real-time monitoring of the rotor 12.

[0025] Among them, the connection between the stator assembly 11 and the first mounting portion 31, the connection between the locking ring 35 and the rotor 12, and the connection between the locking ring 35 and the preload ring 36 can all be screw connections, which is convenient for disassembly and assembly, and for subsequent disassembly and maintenance operations.

[0026] The above are only two preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ring-shaped ultra-thin high-precision hollow motor, characterized in that: include: A motor structure (1) comprises a stator assembly (11) and a rotor (12) which are relatively rotatable; The feedback structure (2) comprises a driving gear (21) and a driven gear (22) meshing with each other, wherein the driving gear (21) is fixedly connected to the rotor (12), and the driven gear (22) meshes with one side of the driving gear (21), and the rotation axis of the driving gear (21) is parallel to the rotation axis of the driven gear (22).

2. The annular ultra-thin high-precision hollow motor according to claim 1, characterized in that: The motor structure (1) and the feedback structure (2) are connected by a mounting flange (3), wherein the mounting flange (3) comprises a first mounting portion (31) for fixing the motor structure (1) and a second mounting portion (32) for fixing the feedback structure (2).

3. The annular ultra-thin high-precision hollow motor according to claim 2, characterized in that: The first mounting portion (31) comprises a first through hole (33); the stator assembly (11) is fixed to the first mounting portion (31) and surrounds the first through hole (33); a first bearing (34) is provided in the first through hole (33); the stator assembly (11) is arranged on the outer ring of the first bearing (34); and the rotor (12) is matched with the stator assembly (11) and fixed to the inner ring of the first bearing (34).

4. The annular ultra-thin high-precision hollow motor according to claim 3, characterized in that: A locking member is also provided for limiting the rotor (12) and the first bearing (34), the locking member comprising a locking ring (35) and a preload ring (36), the locking ring (35) and the preload ring (36) being combined and fixed to the inner ring of the first bearing (34), and the locking ring (35) being fixed to the rotor (12).

5. The annular ultra-thin high-precision hollow motor according to claim 3, characterized in that: The second mounting portion (32) includes a second through hole, the second through hole is located on the side of the first through hole (33), a second bearing is arranged in the second through hole, a rotating rod (23) is arranged at the rotating shaft position of the driven gear (22), and the rotating rod (23) is fixed to the inner ring of the second bearing.

6. The annular ultra-thin high-precision hollow motor according to claim 1, characterized in that: The number of teeth of the driving gear (21) is at least 8 times the number of teeth of the driven gear (22).

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