A novel stepping motor structure

Abstract

The utility model discloses a new -type stepping motor structure is internally provided with stator subassembly, rotor subassembly in its motor shell, and the motor rotating shaft is arranged in the core part of rotor subassembly, and the front bearing hole position of the front bearing seat of motor shell front side is internally provided with the front ball bearing, and the motor rotating shaft is rotatably connected with the front bearing seat through the front ball bearing, the rear bearing hole position of the rear bearing seat of motor shell rear side is internally provided with the rear ball bearing, and the rear end of motor rotating shaft is rotatably connected with the rear bearing seat through the rear ball bearing, and the front end of motor rotating shaft penetrates the front bearing hole position and extends to the front end side of front bearing seat, and the front end of front bearing seat is provided with cylindrical connecting portion, and the cylindrical connecting portion is the integral structure with front bearing seat, and the outer circumferential surface of cylindrical connecting portion is provided with outer thread, and the front bearing hole position extends to the inside of cylindrical connecting portion, and the compression spring is arranged in the rear side of front ball bearing in the front bearing hole position. Through the above structure design, the utility model has the advantages of novel design, compact structure and convenient and fast installation.

Description

Technical Field

[0001] This utility model relates to the field of stepper motor technology, and in particular to a novel stepper motor structure. Background Technology

[0002] Chinese utility model patent with patent number ZL202322590682.3 and title "A Screw Output Stepper Motor" discloses the following technical solution: A screw output stepper motor, including a motor body, the motor body including a motor housing, a stator assembly, and a rotor assembly; a front fixed bracket is installed at the front end of the motor housing, and a rear cover plate is installed at the rear end of the motor housing; the rotor assembly includes a synchronously rotating drive shaft, a drive screw, and a magnet; a plastic part is fitted behind the drive screw on the drive shaft, and the magnet... Located around the plastic part, the drive shaft, plastic part, and magnet are injection molded into a single structure; a front ball bearing is installed in the front bearing hole of the front fixed bracket, and a rear ball bearing is installed in the rear bearing hole of the rear cover plate. The front end of the drive shaft is mounted to the front fixed bracket via the front ball bearing, and the rear end of the drive shaft is mounted to the rear cover plate via the rear ball bearing; a stop is slidably fitted between the rear end of the drive shaft, the rear ball bearing, and the plastic part is equipped with a compression spring that elastically abuts against the stop, and the stop abuts against the inner ring of the rear ball bearing.

[0003] It should be noted that the above-mentioned screw-output stepper motor still has the following drawbacks, specifically:

[0004] Defect 1: This screw output stepper motor is installed by means of a front fixed bracket for fastening. The front fixed bracket needs to be made with corresponding positioning holes and screw holes, which makes the installation inconvenient.

[0005] Defect 2: The front end of the drive shaft is mounted on the front fixed bracket via a front ball bearing. This means the front fixed bracket needs to extend from the front side of the motor housing to the front end of the drive shaft, which increases the overall size of the screw output stepper motor and results in poor structural compactness. Utility Model Content

[0006] The purpose of this utility model is to provide a new stepper motor structure to address the shortcomings of the existing technology. This new stepper motor structure has a novel design, a compact structure, and is easy and quick to install.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0008] A novel stepper motor structure includes a motor housing, a stator assembly and a rotor assembly located inside the stator assembly, and a motor shaft disposed in the core of the rotor assembly;

[0009] A front bearing housing is fastened to the front side of the motor housing. The front bearing housing has a front bearing hole, and a front ball bearing is installed in the front bearing hole. The motor shaft is rotatably connected to the front bearing housing through the front ball bearing. A rear bearing housing is fastened to the rear side of the motor housing. The rear bearing housing has a rear bearing hole, and a rear ball bearing is installed in the rear bearing hole. The rear end of the motor shaft is rotatably connected to the rear bearing housing through the rear ball bearing.

[0010] The front end of the motor shaft passes through the front bearing hole and extends to the front end of the front bearing housing. The front end of the front bearing housing is provided with a cylindrical connecting part that protrudes forward and surrounds the motor shaft. The cylindrical connecting part and the front bearing housing are an integral structure, and the cylindrical connecting part and the motor shaft are arranged coaxially. The outer circumferential surface of the cylindrical connecting part is provided with external threads.

[0011] The front bearing bore extends into the interior of the cylindrical connector. Inside the front bearing bore, on the rear side of the front ball bearing, a compression spring is installed, which is fitted around the motor shaft. The front end of the compression spring abuts against the inner ring of the front ball bearing, and the rear end of the compression spring abuts against the rotor assembly.

[0012] The rotor assembly also includes a plastic part and a magnet. The plastic part is fitted around the motor shaft, and the magnet is located around the plastic part. The motor shaft, plastic part, and magnet are injection molded into a single structure.

[0013] The front end of the plastic part is fitted with a front washer that is fitted around the motor shaft, and the rear end of the compression spring abuts against the front washer.

[0014] The rear end of the plastic part is fitted with a rear washer that is sleeved around the motor shaft. The rear washer contacts the inner ring of the rear ball bearing and the plastic part.

[0015] The front end of the motor shaft is equipped with a drive screw, which is arranged coaxially with the motor shaft.

[0016] The drive screw and the motor shaft are an integral structure.

[0017] Compared with the prior art, the present invention has the following beneficial effects, specifically:

[0018] 1. During installation, the cylindrical connecting part of the front bearing housing is directly screwed into the internal thread hole of the opposite part through its external thread, so as to realize the quick installation and fixation of the front bearing housing, thereby realizing the quick installation and fixation of this new stepper motor structure.

[0019] 2. The motor shaft extends to the front end of the front bearing housing, meaning the front end of the motor shaft is suspended. Compared to existing technologies, the novel stepper motor structure of this invention is simpler and more compact.

[0020] 3. Since the cylindrical connecting part increases the axial dimension of the entire front bearing housing, by extending the front bearing hole into the interior of the cylindrical connecting part, this structural design can effectively increase the accommodating space of the front bearing hole. By installing the compression spring in the front bearing hole, this utility model can further increase the compactness of the overall structure.

[0021] 4. Therefore, the novel stepper motor structure of this utility model has the advantages of novel design, compact structure and convenient and quick installation. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] Figure 2 This is an exploded view of the present invention.

[0025] Figure 3 This is a cross-sectional schematic diagram of the present invention.

[0026] exist Figures 1 to 3 This includes:

[0027] 1-Motor housing; 2-Stator assembly; 3-Rotor assembly; 31-Motor shaft; 32-Plastic part; 33-Drive screw; 41-Front bearing housing; 411-Front bearing hole; 412-Cylindrical connection part; 413-External thread; 42-Front ball bearing; 51-Rear bearing housing; 511-Rear bearing hole; 52-Rear ball bearing; 6-Compression spring; 71-Front washer; 72-Rear washer. Detailed Implementation

[0028] The present invention will now be described in conjunction with specific embodiments.

[0029] Example 1, as Figures 1 to 3 As shown, a novel stepper motor structure includes a motor housing 1, a stator assembly 2 and a rotor assembly 3 located inside the stator assembly 2, and a motor shaft 31 disposed in the core of the rotor assembly 3.

[0030] Among them, such as Figures 1 to 3As shown, a front bearing housing 41 is fastened to the front side of the motor housing 1. The front bearing housing 41 has a front bearing hole 411, and a front ball bearing 42 is installed in the front bearing hole 411. The motor shaft 31 is rotatably connected to the front bearing housing 41 through the front ball bearing 42. A rear bearing housing 51 is fastened to the rear side of the motor housing 1. The rear bearing housing 51 has a rear bearing hole 511, and a rear ball bearing 52 is installed in the rear bearing hole 511. The rear end of the motor shaft 31 is rotatably connected to the rear bearing housing 51 through the rear ball bearing 52.

[0031] Furthermore, such as Figures 1 to 3 As shown, the front end of the motor shaft 31 passes through the front bearing hole 411 and extends to the front end of the front bearing housing 41. The front end of the front bearing housing 41 is provided with a cylindrical connecting part 412 that protrudes forward and surrounds the periphery of the motor shaft 31. The cylindrical connecting part 412 and the front bearing housing 41 are an integral structure, and the cylindrical connecting part 412 and the motor shaft 31 are arranged coaxially. The outer circumferential surface of the cylindrical connecting part 412 is provided with an external thread 413.

[0032] Furthermore, such as Figure 2 and Figure 3 As shown, the front bearing hole 411 extends into the interior of the cylindrical connecting portion 412. A compression spring 6, fitted around the motor shaft 31, is installed within the front bearing hole 411 on the rear side of the front ball bearing 42. The front end of the compression spring 6 abuts against the inner ring of the front ball bearing 42, and the rear end of the compression spring 6 abuts against the rotor assembly 3. Similar to existing technologies, the compression spring 6 in this embodiment is used to eliminate axial clearance; its principle will not be elaborated here.

[0033] It should be noted that during the installation of the new stepper motor structure in this embodiment, the cylindrical connecting part 412 of the front bearing housing 41 is directly screwed to the internal thread hole of the opposite part through its external thread 413, so as to realize the quick installation and fixation of the front bearing housing 41, thereby realizing the quick installation and fixation of the new stepper motor structure.

[0034] It should be emphasized that in this embodiment, the motor shaft 31 extends to the front end of the front bearing housing 41, that is, the front end of the motor shaft 31 in this embodiment is a suspended structure; compared with the prior art, the new stepper motor structure in this embodiment is simpler and more compact.

[0035] It should be further emphasized that, since the cylindrical connecting part 412 increases the axial dimension of the entire front bearing housing 41, this structural design can effectively increase the accommodating space of the front bearing hole 411 by extending the front bearing hole 411 into the interior of the cylindrical connecting part 412. By installing the compression spring 6 in the front bearing hole 411, this embodiment can further increase the compactness of the overall structure.

[0036] In summary, the novel stepper motor structure of this embodiment has the advantages of novel design, compact structure, and convenient and quick installation through the above structural design.

[0037] Example 2, as Figure 2 and Figure 3 As shown, the difference between this embodiment 2 and embodiment 1 is that the rotor assembly 3 also includes a plastic part 32 and a magnet. The plastic part 32 is fitted around the motor shaft 31, and the magnet is located around the plastic part 32. The motor shaft 31, the plastic part 32, and the magnet are injection molded into an integral structure.

[0038] Among them, the front end of the plastic part 32 is equipped with a front gasket 71 that is fitted around the motor shaft 31, and the rear end of the compression spring 6 abuts against the front gasket 71.

[0039] It should be explained that, for the novel stepper motor structure of this embodiment two, its stator assembly 2 includes a winding frame and a coil winding wound on the winding frame. The winding frame is limited and secured by the motor housing 1. When the novel stepper motor structure of this embodiment two is in operation, the coil winding is energized and generates a magnetic force on the magnet of the rotor assembly 3. This magnetic force drives the rotor assembly 3 to rotate relative to the stator assembly 2, thereby enabling the motor shaft 31 to output power.

[0040] For the front gasket 71 in this second embodiment, it can effectively prevent the compression spring 6 from directly contacting the plastic part 32 of the rotor assembly 3.

[0041] Example 3, as Figure 2 and Figure 3 As shown, the difference between this embodiment 3 and embodiment 2 is that: the rear end of the plastic part 32 is provided with a rear gasket 72 that is fitted around the motor shaft 31, and the rear gasket 72 contacts the inner ring of the rear ball bearing 52 and the plastic part 32 respectively.

[0042] Example 4, as Figures 1 to 3 As shown, the difference between this embodiment four and embodiment one is that a drive screw 33 is installed at the front end of the motor shaft 31, and the drive screw 33 is arranged coaxially with the motor shaft 31.

[0043] It should be explained that the drive screw 33 and the motor shaft 31 can be an integral structure.

[0044] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A novel stepper motor structure, comprising a motor housing (1), a stator assembly (2) and a rotor assembly (3) located inside the stator assembly (2), and a motor shaft (31) disposed in the core of the rotor assembly (3). A front bearing housing (41) is fastened to the front side of the motor housing (1). The front bearing housing (41) has a front bearing hole (411) and a front ball bearing (42) is installed inside the front bearing hole (411). The motor shaft (31) is rotatably connected to the front bearing housing (41) through the front ball bearing (42). A rear bearing housing (51) is fastened to the rear side of the motor housing (1). The rear bearing housing (51) has a rear bearing hole (511) and a rear ball bearing (52) is installed inside the rear bearing hole (511). The rear end of the motor shaft (31) is rotatably connected to the rear bearing housing (51) through the rear ball bearing (52). Its features are: The front end of the motor shaft (31) passes through the front bearing hole (411) and extends to the front end of the front bearing housing (41). The front end of the front bearing housing (41) is provided with a cylindrical connecting part (412) that protrudes forward and surrounds the periphery of the motor shaft (31). The cylindrical connecting part (412) and the front bearing housing (41) are an integral structure, and the cylindrical connecting part (412) and the motor shaft (31) are arranged coaxially. The outer circumferential surface of the cylindrical connecting part (412) is provided with an external thread (413). The front bearing hole (411) extends into the interior of the cylindrical connecting part (412). Inside the front bearing hole (411), a compression spring (6) is installed on the rear side of the front ball bearing (42) and is fitted around the motor shaft (31). The front end of the compression spring (6) abuts against the inner ring of the front ball bearing (42), and the rear end of the compression spring (6) abuts against the rotor assembly (3).

2. The novel stepper motor structure according to claim 1, characterized in that: The rotor assembly (3) also includes a plastic part (32) and a magnet. The plastic part (32) is fitted around the motor shaft (31), and the magnet is located around the plastic part (32). The motor shaft (31), the plastic part (32), and the magnet are injection molded into an integrated structure. The front end of the plastic part (32) is fitted with a front gasket (71) that is fitted around the motor shaft (31), and the rear end of the compression spring (6) abuts against the front gasket (71).

3. The novel stepper motor structure according to claim 2, characterized in that: The rear end of the plastic part (32) is fitted with a rear gasket (72) that is fitted around the motor shaft (31). The rear gasket (72) contacts the inner ring of the rear ball bearing (52) and the plastic part (32) respectively.

4. The novel stepper motor structure according to claim 1, characterized in that: The front end of the motor shaft (31) is equipped with a drive screw (33), which is coaxially arranged with the motor shaft (31).

5. A novel stepper motor structure according to claim 4, characterized in that: The drive screw (33) and the motor shaft (31) are an integral structure.

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