Hollow lead screw nut motor

Abstract

The utility model is applicable to the technical field of ultrasonic motors, and provides a hollow lead screw nut motor which is matched with an external lead screw for use, the motor comprises a shell with a cover plate, a motor shaft is rotatably connected between the cover plate and the bottom of the shell, the motor shaft is of a hollow tubular structure, the inner ring of the motor shaft is provided with a thread along the length direction, and the inner ring of the motor shaft is provided with a nut. The external lead screw is in threaded connection with an inner ring of the motor shaft, a stator assembly and a rotor assembly which surround the periphery of the motor shaft by a circle are arranged in the shell, the stator assembly and the rotor assembly are driven by a driving circuit board to achieve relative rotation, and the rotor assembly is fixedly connected with the motor shaft; the motor shaft is designed to be of a hollow tubular structure, the inner ring of the motor shaft is provided with threads, that is, the motor shaft is of a hollow nut structure, the motor shaft is driven to rotate through cooperation of the stator assembly and the rotor assembly, linear motion of the external lead screw can be achieved, the length size of the external lead screw can be customized according to actual application scenes, and different applications can be met; and the use flexibility is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic motors, and particularly relates to a hollow lead screw nut motor. Background Art

[0002] Currently, the types of ultrasonic motors on the market are relatively limited, which restricts their use in diverse application scenarios. Existing ultrasonic motors are often designed with standardized sizes, which limits their use in customized applications that require specific sizes. For example, in precision instruments or small devices, smaller-sized motors may be needed to fit into compact spaces. That is, existing motors lack the ability to customize the size and shape according to specific application scenarios and lack flexibility, making it difficult for them to adapt to applications with special requirements for shape, such as scenarios that require a specific profile to match the device structure or meet aesthetic requirements.

[0003] Therefore, existing ultrasonic motors are not flexible enough in structure to meet the specific requirements for size and shape in specific application scenarios. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the deficiency of insufficient flexibility in the above-mentioned existing technology and provide a hollow lead screw nut motor.

[0005] The utility model is realized as follows: A hollow lead screw nut motor is used in cooperation with an external lead screw. The motor includes a housing with a cover plate. A motor shaft is rotatably connected between the cover plate and the bottom of the housing. The motor shaft is a hollow tubular structure. Threads are provided along the length direction of the inner circle of the motor shaft. The external lead screw is threadedly connected to the inner circle of the motor shaft. A stator assembly and a rotor assembly surrounding the outer periphery of the motor shaft are further provided inside the housing. Relative rotation between the stator assembly and the rotor assembly is achieved through the drive of a drive circuit board. The rotor assembly is fixedly connected to the motor shaft.

[0006] Further, through holes adapted to the size of the motor shaft are provided on both the cover plate and the bottom of the housing. A bearing is provided in each through hole. Both ends of the motor shaft are connected to the inner rings of the corresponding bearings.

[0007] Further, a protrusion is provided on the side of the cover plate facing the bottom of the housing. The protrusion is a ring structure and is provided corresponding to the position of the through hole on the cover plate. The bearing is provided in the inner circle of the protrusion. The stator assembly is fixed to the cover plate around the outer circle of the protrusion.

[0008] Further, an encoder is also connected to the housing. The encoder is signal-connected to the drive circuit board to detect the position and speed of the rotor assembly.

[0009] Furthermore, a positioning plate is provided on the outer wall of the motor shaft, and the rotor assembly is detachably connected to the motor shaft through the positioning plate and a plurality of rotor screws.

[0010] Furthermore, a plurality of positioning holes are provided at positions around the protrusion of the cover plate, and the stator assembly is detachably connected to the cover plate through the positioning holes and a plurality of stator screws.

[0011] A hollow lead screw nut motor provided by the present utility model designs the motor shaft as a hollow tubular structure, and a thread is provided on the inner ring of the motor shaft, that is, the motor shaft is a hollow nut structure. Among them, the cooperation of the stator assembly and the rotor assembly drives the rotation of the motor shaft. At this time, the connection between the external lead screw and the motor shaft can realize the linear motion of the external lead screw. Users can customize the length dimension of the external lead screw according to the actual application scenario to meet different applications and improve the flexibility of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0013] The following drawings are only intended to illustrate and explain the present utility model schematically and do not limit the scope of the present utility model.

[0014] Figure 1 It is a schematic structural diagram provided by the present utility model.

[0015] Figure 2 It is an exploded view of the structure provided by the present utility model.

[0016] Figure 3 It is an exploded view of the structure of the cooperation between the motor and the external lead screw in the present utility model.

[0017] Explanation of the reference numerals in the drawings: 1. External lead screw; 2. Cover plate; 21. Protrusion; 22. Positioning hole; 23. Stator screw; 3. Housing; 4. Motor shaft; 41. Positioning plate; 42. Rotor screw; 5. Stator assembly; 6. Rotor assembly; 7. Encoder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following will further describe the present utility model in detail with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0019] Please refer to Figures 1-3 , which discloses a hollow lead screw nut motor for a utility model, used in cooperation with an external lead screw 1. The motor includes a housing 3 with a cover plate 2. A motor shaft 4 is rotatably connected between the cover plate 2 and the bottom of the housing 3. The motor shaft 4 is a tubular structure with a hollow design. A thread is provided along the length direction of the inner circle of the motor shaft 4. Thus, the structure of the motor shaft 4 can be regarded as a hollow nut structure, and the external lead screw 1 is threadedly connected to the inner circle of the motor shaft 4.

[0020] A stator assembly 5 and a rotor assembly 6 surrounding the periphery of the motor shaft 4 are further provided inside the housing 3. Relative rotation is achieved between the stator assembly 5 and the rotor assembly 6 through the drive of a drive circuit board. The stator assembly 5 generally consists of an elastic ring, a piezoelectric ceramic ring, and an elastic metal ring with convex teeth bonded thereto, while the rotor assembly 6 is composed of a rotating ring and a friction material. When the drive circuit board sends a start signal, the piezoelectric ceramic ring generates vibrations when an AC voltage with an ultrasonic frequency is applied. These vibrations are transmitted and amplified through the convex teeth of the stator assembly 5, and then sufficient frictional force is generated between the stator assembly 5 and the rotor assembly 6 to drive the rotor assembly 6 to move. The principle of relative rotation between the stator assembly 5 and the rotor assembly 6 is prior art and will not be further elaborated in detail in this embodiment. Specifically, the rotor assembly 6 is fixedly connected to the motor shaft 4. When the rotor assembly 6 rotates in cooperation with the stator assembly 5, it will drive the motor shaft 4 to rotate synchronously. Since the external lead screw 1 is threadedly connected to the inner thread of the motor shaft 4, the rotational movement of the motor shaft 4 is converted into the linear movement of the external lead screw, achieving the effect of driving the external lead screw 1 by this motor. And the threaded connection between the external lead screw 1 and the inner thread of the motor shaft 4 does not limit the length dimension of the external lead screw 1, that is, the user can customize the length dimension of the external lead screw 1 according to the actual application scenario to meet different applications and improve the flexibility of use.

[0021] Furthermore, the housing 3 is also connected with an encoder 7. The encoder 7 is signal-connected to the drive circuit board to detect the position and speed of the rotor assembly 6, realizing precise control of the rotational movement of the motor shaft 4 to achieve the effect of controlling the external lead screw 1.

[0022] Further, in order to enable the motor shaft 4 to rotate smoothly under the combined drive of the stator assembly 5 and the rotor assembly 6, through holes adapted to the size of the motor shaft 4 are provided at the bottoms of both the cover plate 2 and the housing 3. A bearing is provided in each through hole, and both ends of the motor shaft 4 are connected to the inner ring of the corresponding bearing, that is, the housing 3 and the cover plate 2 will not affect the rotational movement of the motor shaft 4 while maintaining their relative positions unchanged.

[0023] Meanwhile, in order to keep the stator assembly 5 in the same relative position as the housing 3 and the cover plate 2 when the motor shaft 4 rotates, a protrusion 21 is provided on the side of the cover plate 2 facing the bottom of the housing 3. The protrusion 21 is of an annular structure and is arranged corresponding to the position of the through hole on the cover plate 2. The bearing is arranged in the inner ring of the protrusion 21, and the stator assembly 5 is fixed to the cover plate 2 around the outer ring of the protrusion 21.

[0024] A positioning plate 41 is provided on the outer wall of the motor shaft 4. The rotor assembly 6 is detachably connected to the motor shaft 4 through the positioning plate 41 and a number of rotor screws 42. At the same time, a number of positioning holes 22 are provided at the position of the cover plate 2 around the protrusion 21 for one week. The stator assembly 5 is detachably connected to the cover plate 2 through the positioning holes 22 and a number of stator screws 23, that is, the stator assembly 5 and the rotor assembly 6 can be disassembled separately. If one of the stator assembly 5 and the rotor assembly 6 is damaged or both are damaged at the same time, the stator assembly 5 and the rotor assembly 6 can be repaired or replaced separately without replacing the entire motor, which can reduce the maintenance cost and downtime. Or, the user can separately replace or upgrade the stator assembly 5 or the rotor assembly 6 according to specific application requirements or performance requirements to improve the performance of the entire motor or adapt to new working conditions.

[0025] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, or improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hollow screw nut motor, used in conjunction with an external screw (1), characterized in that: The motor comprises a housing (3) with a cover plate (2); a motor shaft (4) is rotatably connected between the cover plate (2) and the bottom of the housing (3); the motor shaft (4) is a hollow tubular structure; the inner ring of the motor shaft (4) is provided with threads along its length direction; the external screw rod (1) is threadedly connected to the inner ring of the motor shaft (4); a stator assembly (5) and a rotor assembly (6) are also provided in the housing (3) and surround the outer periphery of the motor shaft (4); the stator assembly (5) and the rotor assembly (6) are driven by a driving circuit board to achieve relative rotation; the rotor assembly (6) is fixedly connected to the motor shaft (4).

2. A hollow screw nut motor according to claim 1, characterized in that: The bottoms of the cover plate (2) and the housing (3) are both provided with through holes adapted to the size of the motor shaft (4), each through hole is provided with a bearing, and both ends of the motor shaft (4) are connected to the inner rings of the corresponding bearings.

3. A hollow screw nut motor according to claim 2, characterized in that: A protrusion (21) is provided inwardly on one side of the cover plate (2) facing the bottom of the housing (3); the protrusion (21) is an annular structure and is arranged corresponding to the position of the through hole on the cover plate (2); the bearing is arranged on the inner ring of the protrusion (21); and the stator assembly (5) is fixed to the cover plate (2) around the outer ring of the protrusion (21).

4. The hollow screw nut motor according to claim 1, characterized in that: The housing (3) is also connected to an encoder (7), and the encoder (7) is connected to the drive circuit board signal to detect the position and speed of the rotor assembly (6).

5. The hollow screw nut motor according to claim 1, characterized in that: A positioning plate (41) is provided on the outer wall of the motor shaft (4), and the rotor assembly (6) is detachably connected to the motor shaft (4) via the positioning plate (41) and a plurality of rotor screws (42).

6. The hollow screw nut motor according to claim 3, characterized in that: The cover plate (2) is provided with a plurality of positioning holes (22) around the protrusion (21), and the stator assembly (5) is detachably connected to the cover plate (2) via the positioning holes (22) and a plurality of stator screws (23).

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