Stepper electric motor

Abstract

A stepper electric motor, comprising an electric motor front end cap (2), an electric motor rear end cap (3), an electric motor stator core (6), an electric motor front rotor core (7), an electric motor rear rotor core (8), an electric motor front bearing (10), an electric motor rear bearing (11), a magnetic encoder steel magnet (15) and an electric motor shaft (16), wherein a magnetic encoder steel magnet holder (14) for fixing the magnetic encoder steel magnet (15) is mounted at the rear end of the electric motor shaft (16); a wave washer (13) is provided between the electric motor rear bearing (11) and the electric motor rear end cap (3); and the electric motor front bearing (10) is fixed by means of a step structure formed between the electric motor front end cap (2) and the electric motor shaft (16). Compared with the prior art, the present solution has advantages such as significantly improving the ability of an electric motor to resist axial displacement caused by axial impact, preventing failure of the electric motor due to the axial displacement caused by axial impact.

Description

A stepping motor Technical Field

[0001] The utility model relates to a motor, in particular to a stepping motor. Background Art

[0002] As shown in Figure 1, the existing stepper motor includes a motor front cover 2, a motor rear cover 3, a motor front frame 4, a motor rear frame 5, a motor stator core 6, a motor front rotor core 7, a motor rear rotor core 8, a motor magnet 9, a motor front bearing 10, a motor rear bearing 11, an O-ring 12, a wave washer 13, a magnetic braid magnet 15 and a motor shaft 16;

[0003] A magnetic steel seat 14 for fixing the magnetic steel 15 is installed at the rear end of the motor shaft 16, and a wave pad 13 is provided between the motor rear bearing 11 and the motor rear end cover 3.

[0004] The function of the wave pad 13 is to apply a certain preload to the bearing, eliminate the axial clearance of the bearing, and make the bearing work in a suitable state. At the same time, the wave pad also balances the axial force on the motor output shaft.

[0005] The motor shaft and end caps contain glue reservoirs 17 on the front bearing, 18 on the front bearing front end cap, and 19 on the rear bearing shaft. These reservoirs are used to limit the axial displacement of the bearings. However, when significant forces are applied to the motor's output shaft in either axial direction, particularly in the opposite direction, the motor's wave pads will be flattened, resulting in significant axial displacement. This can cause the motor's magnetic encode signal to fail, and the motor to stop operating.

[0006] On the other hand, axial displacement will cause the wave pad to be in a cyclic state of compression and loosening, which will cause fatigue fracture of the wave pad over time, thus affecting the life of the motor.

[0007] Therefore, how to improve the motor's ability to resist axial displacement caused by axial impact and prevent the motor from failing due to axial displacement caused by axial impact has become a technical problem that needs to be solved.

[0008] Utility Model Content

[0009] The purpose of the present invention is to provide a stepping motor in order to overcome the above-mentioned defects in the prior art.

[0010] The purpose of the utility model can be achieved through the following technical solutions:

[0011] According to one aspect of the present invention, a stepper motor is provided, comprising a motor front end cover, a motor rear end cover, a motor stator core, a motor front rotor core, a motor rear rotor core, a motor front bearing, a motor rear bearing magnetic woven magnet and a motor shaft, wherein the rear end of the motor shaft is provided with a magnetic woven magnet seat for fixing the magnetic woven magnet, a wave pad is provided between the motor rear bearing and the motor rear end cover, and the motor front bearing is fixed by a step structure formed between the motor front end cover and the motor shaft.

[0012] As a preferred technical solution, the motor shaft is provided with a first thread, and the motor further includes a first locking nut cooperating with the first thread, and the first locking nut fixes the inner ring of the motor front bearing on the motor shaft.

[0013] As a preferred technical solution, the first locking nut is fixed to the motor shaft by thread glue.

[0014] As a preferred technical solution, a second thread is provided in the bearing chamber of the front end cover of the motor, and the motor also includes a second locking nut that cooperates with the second thread, and the second locking nut fixes the outer ring of the motor front bearing on the front end cover of the motor.

[0015] As a preferred technical solution, the second locking nut fixes the motor front end cover by thread glue.

[0016] As a preferred technical solution, the motor further includes a first sleeve, which fixes the outer ring of the motor front bearing to the front end cover of the motor.

[0017] As a preferred technical solution, the first shaft sleeve is fixed to the front end cover of the motor by glue.

[0018] As a preferred technical solution, the motor further includes a second sleeve, which fixes the inner ring of the motor front bearing on the motor shaft.

[0019] As a preferred technical solution, the second sleeve is fixed to the motor shaft by glue.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] The utility model fixes the front bearing of the motor between the front end cover and the step of the shaft through the design of two locking nuts / sleeves for the shaft and the end cover, limits the axial displacement of the motor, greatly improves the motor's ability to resist axial impact and axial displacement, and prevents the motor from failing due to axial displacement caused by axial impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic structural diagram of an existing stepping motor;

[0023] FIG2 is a schematic structural diagram of Example 1 of the present utility model;

[0024] FIG3 is a schematic structural diagram of Example 2 of the present utility model;

[0025] Among them, A is the existing stepper motor, 2 is the front end cover of the motor, 3 is the rear end cover of the motor, 4 is the front frame of the motor, 5 is the rear frame of the motor, 6 is the stator core of the motor, 7 is the front rotor core of the motor, 8 is the rear rotor core of the motor, 9 is the motor magnet, 10 is the front bearing of the motor, 11 is the rear bearing of the motor, 12 is the O-ring, 13 is the wave pad, 14 is the magnetic braided magnet seat, 15 is the magnetic braided magnet, 16 is the motor shaft, 17 is the glue storage tank on the front bearing shaft of the motor, 18 is the glue storage tank on the front end cover of the front bearing of the motor, and 19 is the glue storage tank on the rear bearing shaft of the motor.

[0026] B is the stepping motor of Example 1, 20 is the first locking nut, and 21 is the second locking nut;

[0027] C is the stepping motor of Example 2, 22 is the first shaft sleeve, and 23 is the second shaft sleeve. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0029] Example 1

[0030] As shown in Figure 2, the utility model is a stepping motor, including a motor front end cover 2, a motor rear end cover 3, a motor stator core 6, a motor front rotor core 7, a motor rear rotor core 8, a motor front bearing 10, a motor rear bearing 11 magnetic woven magnet 15 and a motor shaft 16. The rear end of the motor shaft 16 is equipped with a magnetic woven magnet seat 14 for fixing the magnetic woven magnet 15. A wave pad 13 is arranged between the motor rear bearing 11 and the motor rear end cover 3. The motor front bearing 10 is fixed by a step structure formed between the motor front end cover 2 and the motor shaft 16.

[0031] The motor shaft 16 is provided with a first thread, and the motor further includes a first locking nut 20 that cooperates with the first thread. The first locking nut 20 secures the inner ring of the motor front bearing 10 to the motor shaft 16. A step is provided on the other side of the shaft. The bearing chamber of the motor front end cover 2 is provided with a second thread, and the motor further includes a second locking nut 21 that cooperates with the second thread. The second locking nut 21 secures the outer ring of the motor front bearing 10 to the motor front end cover 2.

[0032] The first locking nut 20 is fixed to the motor shaft 16 by thread glue. The second locking nut 21 is fixed to the motor front end cover 2 by thread glue.

[0033] Two locking nuts secure the front bearing of the motor between the bearing chamber of the front end cover and the step of the output shaft. The axial force borne by the motor output shaft will be applied to the locking nut. The locking nut is fixed with thread glue, which improves the reliability of the motor in resisting axial impact force, avoids encoder failure caused by the axial position of the motor, and improves the reliability of the motor.

[0034] Example 2

[0035] As shown in Figure 3, the utility model is a stepper motor, including a motor front end cover 2, a motor rear end cover 3, a motor stator core 6, a motor front rotor core 7, a motor rear rotor core 8, a motor front bearing 10, a motor rear bearing 11 magnetic woven magnet 15 and a motor shaft 16. The rear end of the motor shaft 16 is equipped with a magnetic woven magnet seat 14 for fixing the magnetic woven magnet 15. A wave pad 13 is arranged between the motor rear bearing 11 and the motor rear end cover 3. The motor front bearing 10 is fixed by a step structure formed between the motor front end cover 2 and the motor shaft 16.

[0036] The motor further includes a first sleeve 22 and a second sleeve 23 . The first sleeve 22 fixes the outer ring of the motor front bearing 10 on the motor front end cover 2 , and the second sleeve 23 fixes the inner ring of the motor front bearing 10 on the motor shaft 16 .

[0037] The first shaft sleeve 22 is fixed on the motor front end cover 2 by glue. The second shaft sleeve 23 is fixed on the motor shaft 16 by glue.

[0038] Two bushings fix the front bearing of the motor between the bearing chamber of the front end cover and the step of the output shaft. The axial force borne by the motor output shaft will be applied to the bushing. The bushing is fixed by glue, which improves the reliability of the motor in resisting axial impact force, avoids encoder failure caused by the axial position of the motor, and improves the reliability of the motor.

[0039] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A stepper motor, comprising a motor front end cover (2), a motor rear end cover (3), a motor stator core (6), a motor front rotor core (7), a motor rear rotor core (8), a motor front bearing (10), a motor rear bearing (11), a magnetic steel (15) and a motor shaft (16), wherein a magnetic steel seat (14) for fixing the magnetic steel (15) is installed at the rear end of the motor shaft (16), a wave pad (13) is arranged between the motor rear bearing (11) and the motor rear end cover (3), and characterized in that: The motor front bearing (10) is fixed via a step structure formed between the motor front end cover (2) and the motor shaft (16).

2. A stepper motor according to claim 1, characterized in that: The motor shaft (16) is provided with a first thread, and the motor further comprises a first locking nut (20) matched with the first thread, wherein the first locking nut (20) fixes the inner ring of the motor front bearing (10) on the motor shaft (16).

3. A stepping motor according to claim 2, characterized in that: The first locking nut (20) is fixed to the motor shaft (16) by means of thread glue.

4. A stepping motor according to claim 1, characterized in that: A second thread is provided in the bearing chamber of the front end cover (2) of the motor, and the motor further comprises a second locking nut (21) matched with the second thread, wherein the second locking nut (21) fixes the outer ring of the front bearing (10) of the motor to the front end cover (2) of the motor.

5. A stepping motor according to claim 4, characterized in that: The second locking nut (21) is fixed to the motor front end cover (2) by means of thread glue.

6. A stepping motor according to claim 1, characterized in that: The motor further comprises a first shaft sleeve (22), wherein the first shaft sleeve (22) fixes the outer ring of the motor front bearing (10) on the motor front end cover (2).

7. A stepping motor according to claim 6, characterized in that: The first shaft sleeve (22) is fixed to the front end cover (2) of the motor by glue.

8. A stepping motor according to claim 1, characterized in that: The motor further comprises a second shaft sleeve (23), wherein the second shaft sleeve (23) fixes the inner ring of the motor front bearing (10) on the motor shaft (16).

9. A stepping motor according to claim 8, characterized in that: The second shaft sleeve (23) is fixed on the motor shaft (16) by glue.

Images