Motor end cover and stepping motor with same

Abstract

The invention relates to a motor end cover and a stepping motor with the motor end cover, the motor end cover comprises a motor front end cover and a motor rear end cover, the motor front end cover and / or the motor rear end cover are / is provided with a seam allowance structure matched with a motor stator iron core, the seam allowance structure is a segmented seam allowance structure, comprising a first spigot in interference fit with the inner diameter of a motor stator core and a second spigot in clearance fit with the inner diameter of the motor stator core. Compared with the prior art, the motor has the advantages that the manufacturing and processing difficulty of motor parts is reduced, the convenience of motor installation is improved, the production efficiency of the motor is improved, and the manufacturing cost of the motor is reduced.

Description

Technical Field

[0001] The invention relates to a motor, in particular to a motor end cover and a stepping motor with the end cover. Background Art

[0002] like Figure 1 As shown, the existing hybrid stepper motor structure includes a motor stator core 1, a motor front end cover 2, a motor rear end cover 3, a rotor core 4, a rotor magnet 5, a magnetic isolation plate 6, a rotating shaft 7, a motor front bearing 8, a motor rear bearing 9, a locking nut 10 for the front end cover, a locking nut 11 for the shaft, a motor magnetic braid assembly 12 and a motor output wire assembly 13.

[0003] In the existing stepper motor solution, the structure is shown in the figure above. The outer diameter φ1 of the stop of the front and rear end covers of the motor and the inner diameter φ0 of the motor stator are installed and matched. In order to improve the rigidity of the motor structure, it is generally designed that φ0<φ1, which means that the stop of the front and rear end covers of the motor and the inner diameter of the stator are interference fit.

[0004] The stator core of the motor is generally made of stacked silicon steel sheets, the thickness of which is L0. Figure 1 It can be seen that L1 is the matching length of the motor front cover and the stopper. In order to ensure the convenience of processing and installation, and save the amount of silicon steel sheet, generally, L0 <L1<4*L0。

[0005] In the motor structure with special axial displacement control requirements, when the current bearing is fixed with two locking nuts and a wider bearing is selected to ensure the life of the bearing, L1 will be much larger than L0. This will result in extremely high precision requirements for the outer diameter of the motor end cover stop and the inner diameter of the core. Slight roundness and dimensional deviation will make the interference fit installation of the end cover and the core extremely difficult, resulting in quality risks for the motor and increased manufacturing costs. Summary of the invention

[0006] The purpose of the present invention is to provide a motor end cover and a stepping motor having the end cover in order to overcome the defects of the prior art.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] According to one aspect of the present invention, a motor end cover is provided, comprising a motor front end cover and a motor rear end cover, wherein the motor front end cover and / or the motor rear end cover are provided with a stop structure that cooperates with the motor stator core, and the stop structure is a segmented stop structure, comprising a first stop that has an interference fit with the inner diameter of the motor stator core and a second stop that has a clearance fit with the inner diameter of the motor stator core.

[0009] As a preferred technical solution, the relationship between the first stop outer diameter φ1, the second stop outer diameter φ2 and the motor stator core inner diameter φ0 is as follows:

[0010] φ2<φ0<φ1.

[0011] As a preferred technical solution, the first stop length L2 is specifically set as follows:

[0012] L0 <L2<4*L0

[0013] Where L0 is the thickness of the stator laminations.

[0014] As a preferred technical solution, the second stop length L3 is set to: L3 = L1 - L2, where L1 is the stop structure length.

[0015] As a preferred technical solution, the stopper structure length L1 is set as follows:

[0016] 4*L0 <L1

[0017] Where L0 is the thickness of the stator laminations.

[0018] As a preferred technical solution, the front end cover of the motor is provided with a stop structure that cooperates with the stator core of the motor.

[0019] As a preferred technical solution, the rear end cover of the motor is provided with a stop structure that cooperates with the stator core of the motor.

[0020] As a preferred technical solution, both the front end cover and the rear end cover of the motor are provided with a stop structure that cooperates with the stator core of the motor.

[0021] According to another aspect of the present invention, a stepper motor with a motor end cover is provided, including a motor stator core, a rotor core, a rotor magnet, a magnetic isolation plate, a rotating shaft, a motor front bearing, a motor rear bearing, a locking nut for the front end cover, a locking nut for the shaft, a motor magnetic braid assembly and a motor output wire assembly, and the stepper motor also includes the motor end cover described in any one of claims 1-8.

[0022] As a preferred technical solution, the motor end cover includes a motor front end cover and a motor rear end cover, and the motor front end cover and / or the motor rear end cover are provided with a stop structure that cooperates with the motor stator core. The stop structure is a segmented stop structure, including a first stop that has an interference fit with the inner diameter of the motor stator core and a second stop that has a clearance fit with the inner diameter of the motor stator core.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] When the mating rabbet of the motor is relatively long, the form of segmented rabbet can be adopted, which can reduce the manufacturing and processing difficulty of motor parts, improve the convenience of motor installation, thereby enhancing the production efficiency of the motor and reducing the manufacturing cost of the motor. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of an existing motor;

[0026] Figure 2 It is a schematic structural diagram of the motor of the present invention.

[0027] Among them, 1 is the motor stator core, 2 is the motor front end cover, 3 is the motor rear end cover, 4 is the rotor core, 5 is the rotor magnet, 6 is the magnetic isolation sheet, 7 is the rotating shaft, 8 is the front bearing of the motor, 9 is the rear bearing of the motor, 10 is the locking nut for the front end cover, 11 is the locking nut for the shaft, 12 is the motor magnetic encoder assembly, and 13 is the motor lead-out assembly;

[0028] φ0 is the inner diameter of the motor stator core, φ1 is the outer diameter of the first rabbet, φ2 is the outer diameter of the second rabbet, L0 is the thickness of the stator lamination, L1 is the length of the rabbet structure, L2 is the length of the first rabbet, and L3 is the length of the second rabbet. Detailed Embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Embodiment 1

[0031] As Figure 2 shown, a motor end cover includes a motor front end cover 2 and a motor rear end cover 3. A rabbet structure mating with the motor stator core 1 is provided on the motor front end cover 2 and / or the motor rear end cover 3. This rabbet structure is a segmented rabbet structure, including a first rabbet with an interference fit with the inner diameter of the motor stator core 1 and a second rabbet with a clearance fit with the inner diameter of the motor stator core 1.

[0032] The relationship among the outer diameter φ1 of the first rabbet, the outer diameter φ2 of the second rabbet, and the inner diameter φ0 of the motor stator core 1 is as follows: φ2 < φ0 < φ1.

[0033] The first rabbet length L2 is specifically set as follows: L0 < L2 < 4 * L0, where L0 is the thickness of the stator lamination.

[0034] The second rabbet length L3 is set as: L3 = L1 - L2, where L1 is the length of the rabbet structure.

[0035] The length L1 of the rabbet structure is set as follows: 4*L0 < L1, where L0 is the thickness of the stator lamination sheet.

[0036] The front end cover 2 of the motor is provided with a rabbet structure that cooperates with the stator core 1 of the motor. Or the rear end cover 3 of the motor is provided with a rabbet structure that cooperates with the stator core 1 of the motor. Or both the front end cover 2 and the rear end cover 3 of the motor are provided with rabbet structures that cooperate with the stator core 1 of the motor.

[0037] When the length of the rabbet of the motor 4*L0 < L1; the outer diameter of the rabbet of the motor can be set in segments:

[0038] The length L2 of the outer diameter φ1 of the rabbet that has an interference fit with the inner diameter φ0 of the stator is set as: L0 < L2 < 4*L0;

[0039] The length L3 of the outer diameter φ2 of the rabbet that has a clearance fit with the inner diameter φ0 of the stator is set as: L3 = L1 - L2;

[0040] In the present invention, when the rabbet for the rear end cover cooperation is relatively long, the same method can also be adopted.

[0041] Embodiment 2

[0042] As Figure 2 shown, a stepper motor with a motor end cover includes a stator core 1 of the motor, a rotor core 4, a rotor magnet 5, a magnetic isolation sheet 6, a rotating shaft 7, a front bearing 8 of the motor, a rear bearing 9 of the motor, a lock nut 10 for the front end cover, a lock nut 11 for the shaft, a motor magnetic encoder assembly 12, and a motor wire outlet assembly 13. The stepper motor further includes the motor end cover of Embodiment 1.

[0043] The motor end cover includes a front end cover 2 and a rear end cover 3 of the motor. The front end cover 2 and / or the rear end cover 3 of the motor is provided with a rabbet structure that cooperates with the stator core 1 of the motor. This rabbet structure is a segmented rabbet structure, including a first rabbet that has an interference fit with the inner diameter of the stator core 1 and a second rabbet that has a clearance fit with the inner diameter of the stator core 1.

[0044] When the rabbet for the motor cooperation is relatively long, adopting the form of a segmented rabbet can reduce the manufacturing and processing difficulty of the motor parts, improve the convenience of motor installation, thereby improving the production efficiency of the motor and reducing the manufacturing cost of the motor.

[0045] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A motor end cover, comprising a motor front end cover (2) and a motor rear end cover (3), characterized in that: The motor front end cover (2) and / or the motor rear end cover (3) are provided with a stopper structure that cooperates with the motor stator core (1), and the stopper structure is a segmented stopper structure, comprising a first stopper that has an interference fit with the inner diameter of the motor stator core (1) and a second stopper that has a clearance fit with the inner diameter of the motor stator core (1).

2. A motor end cover according to claim 1, characterized in that: The relationship between the first stop outer diameter φ1, the second stop outer diameter φ2 and the motor stator core (1) inner diameter φ0 is as follows: φ2<φ0<φ1.

3. The motor end cover according to claim 1, characterized in that: The first stop length L2 is specifically set as follows: L0 <L2<4*L0 Where L0 is the thickness of the stator laminations.

4. The motor end cover according to claim 1, characterized in that: The second stop length L3 is set to: L3 = L1 - L2, where L1 is the stop structure length.

5. A motor end cover according to claim 4, characterized in that: The stopper structure length L1 is set as follows: 4*L0 <L1 Where L0 is the thickness of the stator laminations.

6. The motor end cover according to claim 1, characterized in that: The motor front end cover (2) is provided with a stop structure that matches the motor stator core (1).

7. The motor end cover according to claim 1, characterized in that: The rear end cover (3) of the motor is provided with a stopper structure that matches the motor stator core (1).

8. The motor end cover according to claim 1, characterized in that: The front end cover (2) and the rear end cover (3) of the motor are both provided with stopper structures that cooperate with the stator core (1) of the motor.

9. A stepper motor with a motor end cover, comprising a motor stator core (1), a rotor core (4), a rotor magnetic steel (5), a magnetic isolation sheet (6), a rotating shaft (7), a motor front bearing (8), a motor rear bearing (9), a locking nut for a front end cover (10), a locking nut for a shaft (11), a motor magnetic braid assembly (12) and a motor lead assembly (13), characterized in that: The stepper motor further comprises a motor end cover as described in any one of claims 1-8.

10. The stepper motor with a motor end cover according to claim 9, characterized in that: The motor end cover comprises a motor front end cover (2) and a motor rear end cover (3), wherein the motor front end cover (2) and / or the motor rear end cover (3) are provided with a stopper structure matched with the motor stator core (1), wherein the stopper structure is a segmented stopper structure, comprising a first stopper having an interference fit with the inner diameter of the motor stator core (1) and a second stopper having a clearance fit with the inner diameter of the motor stator core (1).

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