A stepping motor

Abstract

The present invention relates to a stepper motor, comprising a motor stator, a motor front end cover, a motor mounting plate, a motor rear end cover, a motor front frame, a motor rear frame, a motor rotor assembly, a motor front bearing, a motor rear bearing and a motor fixing screw, wherein the motor front end cover and the motor mounting plate are fixed together, the motor front bearing and the motor rear bearing are respectively mounted on the motor front end cover and the motor rear end cover, the motor fixing screw passes through the motor rear end cover, the motor rear frame, the motor stator and the motor front frame in sequence and then is screwed into the motor front end cover, the stator core of the motor stator adopts a stator core with different slot pitch angles, and the motor fixing screw passes through a slot with a larger slot pitch angle in the stator core. Compared with the prior art, the present invention has the advantages of compact motor volume, being conducive to miniaturization of motor size, and improving the power density of the motor.

Description

Technical Field

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

[0002] Existing hybrid stepper motor structures such as Figure 1-3 As shown, in the existing stepper motors, the motors all have a square external structure, and the four corners of the motor are the motor itself and the fixing screw holes for customers. This structure will cause the external size of the motor to be too large, which is not conducive to the miniaturization of the motor and the improvement of power density.

[0003] After searching, Chinese patent publication number CN203708069U discloses a circular stepper motor, which specifically includes a front end cover, a rear end cover, a stator assembly, a rotor assembly, a front end insulating sheet, and a rear end insulating sheet. The front end cover is circular in shape and has two screws arranged on it. The screws pass through the front end cover, the front end insulating sheet, the stator assembly, the rear end insulating sheet and the rear end cover in sequence. By setting a circular front end cover, it has high efficiency, light weight, high reliability, and can improve the bearing capacity of the rotor; however, this technology still has the following problems: when the screw passes through the stator assembly, the slot area of ​​the stator will be reduced, so that the winding area of ​​the motor will also be reduced, affecting the performance of the motor. Summary of the invention

[0004] The purpose of the present invention is to provide a stepping motor in order to overcome the defects of the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] According to one aspect of the present invention, a stepper motor is provided, comprising a motor stator, a motor front end cover, a motor mounting plate, a motor rear end cover, a motor front frame, a motor rear frame, a motor rotor assembly, a motor front bearing, a motor rear bearing and a motor fixing screw, wherein the motor front end cover and the motor mounting plate are fixed together, the motor front bearing and the motor rear bearing are respectively mounted on the motor front end cover and the motor rear end cover, the motor fixing screw passes through the motor rear end cover, the motor rear frame, the motor stator and the motor front frame in sequence and then is screwed into the motor front end cover, the stator core of the motor stator adopts a stator core with different slot pitch angles, and the motor fixing screw passes through a slot with a larger slot pitch angle in the stator core.

[0007] As a preferred technical solution, the motor front end cover and the motor mounting plate are fixed together by riveting.

[0008] As a preferred technical solution, threaded holes matching the motor fixing screws are provided on the surface of the front end cover of the motor.

[0009] As a preferred technical solution, the rear end cover of the motor is provided with a through hole for the motor fixing screw to pass through.

[0010] As a preferred technical solution, the stator core of the motor stator adopts a two-phase 3.75° step angle stepper motor stator core, and the slot angle of the larger slot is 56.25°.

[0011] As a preferred technical solution, the stator core of the motor stator adopts a two-phase 5.625° step angle stepper motor stator core, and the slot angle of the larger slot is 61.875°.

[0012] As a preferred technical solution, the stator core of the motor stator adopts a two-phase 6° step angle stepper motor stator core, and the slot angle of the larger slot is 54°.

[0013] As a preferred technical solution, the stator core of the motor stator adopts a two-phase 7.5° step angle stepper motor stator core, and the slot angle of the larger slot is 67.5° or 52.5°.

[0014] As a preferred technical solution, the stator core of the motor stator adopts a two-phase 10° step angle stepper motor stator core, and the slot angle of the larger slot is 90°;

[0015] Alternatively, the stator core of the motor stator adopts a two-phase 11.25° step angle stepper motor stator core, and the slot pitch angle of the larger slot is 78.75°.

[0016] As a preferred technical solution, the stator core of the motor stator adopts a three-phase 5.455° step angle stepper motor stator core, and the slot angle of the larger slot is 76.365°;

[0017] Alternatively, the stator core of the motor stator adopts a three-phase 6° or 12° step angle stepper motor stator core, and the slot angle of the larger slot is 72°;

[0018] Alternatively, the stator core of the motor stator adopts a three-phase 7.5° step angle stepper motor stator core, and the slot pitch angle of the larger slot is 60°.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1) Miniaturization and improved power density: The round motor core and the motor fixing screws are inserted into the motor stator core slots. The motor body size does not exceed the stator outer diameter of the motor. The motor is compact, which is conducive to miniaturization of the motor size and improves the power density of the motor.

[0021] 2) The motor performance is guaranteed. When the fixing screws of the motor pass through the larger slot, the actual winding area of ​​the motor is not affected and the performance of the motor is not reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main structure of the existing motor;

[0023] Figure 2 It is a side view structural schematic diagram of an existing motor;

[0024] Figure 3 for Figure 1 AA cross-sectional structural diagram;

[0025] Figure 4 This is a schematic diagram of the main structure of Example 1;

[0026] Figure 5 It is a right view structural schematic diagram of Example 1;

[0027] Figure 6 is a schematic diagram of the three-dimensional structure of Example 1;

[0028] Figure 7 This is a schematic diagram of the explosion structure of Example 1;

[0029] Figure 8 This is a schematic diagram of the front structure of the front end cover of Example 1;

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the front end cover of Example 1;

[0031] Fig.10 This is a schematic diagram of the front structural view of the rear end cover of Example 1;

[0032] Fig.11 It is a schematic diagram of the three-dimensional structure of the rear end cover of Example 1;

[0033] Fig.12 This is a schematic diagram of the stator core structure of Example 2;

[0034] Fig.13 This is a schematic diagram of the stator core structure of Example 3;

[0035] Fig.14 Schematic diagram of the stator core structure of Example 4;

[0036] Fig.15 This is a schematic diagram of the stator core structure of Example 5;

[0037] Fig.16 This is a schematic diagram of the stator core structure of Example 6;

[0038] Fig.17is a schematic diagram of the stator core structure of Example 7;

[0039] Fig.18 This is a schematic diagram of the stator core structure of Example 8;

[0040] Fig.19 is a schematic diagram of the stator core structure of Example 9;

[0041] Fig. 20 is a schematic diagram of the stator core structure of Embodiment 10;

[0042] Fig.21 is a schematic diagram of the stator core structure of Example 11;

[0043] Fig. 22 This is a schematic diagram of the stator core structure of Example 12.

[0044] Among them, a is the motor fixing installation hole, b is the existing motor front cover, c is the existing motor front frame, d is the existing motor rear frame, e is the outlet PCB, and f is the existing motor rear cover;

[0045] 1 is the motor body, 2 is the motor stator, 3 is the motor front end cover, 4 is the motor mounting plate, 5 is the motor rear end cover, 6 is the motor front frame, 7 is the motor rear frame, 8 is the motor rotor assembly, 9 is the motor front bearing, 10 is the motor rear bearing, 11 is the motor fixing screw, 12 is the threaded hole, 13 is the riveting fixing point, and 14 is the through hole. DETAILED DESCRIPTION

[0046] 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 described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0047] Example 1

[0048] like Figure 3-7 As shown, a stepper motor comprises a motor stator 2, a motor front end cover 3, a motor mounting plate 4, a motor rear end cover 5, a motor front frame 6, a motor rear frame 7, a motor rotor assembly 8, a motor front bearing 9, a motor rear bearing 10 and a motor fixing screw 11. The motor front end cover 3 and the motor mounting plate 4 are fixed together, the motor front bearing 9 and the motor rear bearing 10 are respectively mounted on the motor front end cover 3 and the motor rear end cover 5, and the motor fixing screw 11 passes through the motor rear end cover 5, the motor rear frame 7, the motor stator 2, and the motor front frame 6 in sequence and is then screwed into the motor front end cover 3.

[0049] In the present invention, in the circular stator, the fixing screws of the motor are placed in the slots of the stator core of the motor, so that the size of the motor body does not exceed the outer diameter of the stator of the motor, the motor structure is compact, and it is beneficial to improve the power density of the motor.

[0050] When the motor fixing screw 11 passes through the stator core of the motor stator 2, the slot area of ​​the motor stator will be reduced, so the winding area of ​​the motor will also be reduced, affecting the performance of the motor.

[0051] In the present invention, the stator core of the motor stator 2 adopts stator cores with different slot pitch angles, and the motor fixing screws 11 pass through the slots with larger slot pitch angles in the stator core. That is, in the present invention, there are several slots with larger slot pitch angles than other slots. Since the winding of the motor depends on the smallest slot, when the fixing screws of the motor pass through the larger slots, it does not affect the actual winding area of ​​the motor, and the performance of the motor will not be reduced.

[0052] like Figure 8-9 As shown, the motor front end cover 3 and the motor mounting plate 4 are fixed together by riveting. The riveting fixing point 13 is arranged on the motor front end cover 3, and the surface of the motor front end cover 3 is provided with a threaded hole 12 matching the motor fixing screw 11.

[0053] like Figure 10-11 As shown, the motor rear end cover 5 is provided with a through hole 14 for the motor fixing screw 11 to pass through.

[0054] Example 2

[0055] like Fig.12 As shown, the stator core of the motor stator 2 adopts a two-phase 3.75° step angle stepper motor stator core, the slot pitch angle of the larger slot is 56.25°, and the motor fixing screw 11 passes through the slot with a slot pitch angle of 56.25°.

[0056] Example 3

[0057] like Fig.13 As shown, the stator core of the motor stator 2 adopts a two-phase 5.625° step angle stepper motor stator core, the slot pitch angle of the larger slot is 61.875°, and the motor fixing screw 11 passes through the slot with a slot pitch angle of 61.875°.

[0058] Example 4

[0059] like Fig.14 As shown, the stator core of the motor stator 2 adopts a two-phase 6° step angle stepper motor stator core, the slot angle of the larger slot is 54°, and the motor fixing screw 11 passes through the slot with a slot angle of 54°.

[0060] Example 5

[0061] like Fig.15 As shown, the stator core of the motor stator 2 adopts a two-phase 7.5° step angle stepper motor stator core, the slot angle of the larger slot is 67.5°, and the motor fixing screw 11 passes through the slot with a slot angle of 67.5°.

[0062] Example 6

[0063] like Fig.16 As shown, the stator core of the motor stator 2 adopts a two-phase 7.5° step angle stepper motor stator core, the slot angle of the larger slot is 52.5°, and the motor fixing screw 11 passes through the slot with a slot angle of 52.5°.

[0064] Example 7

[0065] like Fig.17 As shown, the stator core of the motor stator 2 adopts a two-phase 10° step angle stepper motor stator core, the slot angle of the larger slot is 90°, and the motor fixing screw 11 passes through the slot with a slot angle of 90°.

[0066] Example 8

[0067] like Fig.18 As shown, the stator core of the motor stator 2 adopts a two-phase 11.25° step angle stepper motor stator core, the slot angle of the larger slot is 78.75°, and the motor fixing screw 11 passes through the slot with a slot angle of 78.75°.

[0068] Example 9

[0069] like Fig.19 As shown, the stator core of the motor stator 2 adopts a three-phase 5.455° step angle stepper motor stator core, the slot pitch angle of the larger slot is 76.365°, and the motor fixing screw 11 passes through the slot with a slot pitch angle of 76.365°.

[0070] Example 10

[0071] like Fig. 20 As shown, the stator core of the motor stator 2 adopts a three-phase 6° step angle stepper motor stator core, the slot angle of the larger slot is 72°, and the motor fixing screw 11 passes through the slot with a slot angle of 72°.

[0072] Embodiment 11

[0073] like Fig.21 As shown, the stator core of the motor stator 2 adopts a three-phase 7.5° step angle stepper motor stator core, the slot pitch angle of the larger slot is 60°, and the motor fixing screw 11 passes through the slot with a slot pitch angle of 60°.

[0074] Example 12

[0075] like Fig. 22 As shown, the stator core of the motor stator 2 adopts a three-phase 12° step angle stepper motor stator core, the slot angle of the larger slot is 72°, and the motor fixing screw 11 passes through the slot with a slot angle of 72°.

[0076] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A stepper motor, comprising a motor stator (2), a motor front end cover (3), a motor mounting plate (4), a motor rear end cover (5), a motor front frame (6), a motor rear frame (7), a motor rotor assembly (8), a motor front bearing (9), a motor rear bearing (10) and a motor fixing screw (11), wherein the motor front end cover (3) and the motor mounting plate (4) are fixed together, the motor front bearing (9) and the motor rear bearing (10) are respectively mounted on the motor front end cover (3) and the motor rear end cover (5), and the motor fixing screw (11) passes through the motor rear end cover (5), the motor rear frame (7), the motor stator (2), and the motor front frame (6) in sequence and is then screwed into the motor front end cover (3), characterized in that: The stator core of the motor stator (2) adopts stator cores with different slot pitch angles, and the motor fixing screws (11) pass through the slots with larger slot pitch angles in the stator core.

2. A stepper motor according to claim 1, characterized in that: The motor front end cover (3) and the motor mounting plate (4) are fixed together by riveting.

3. A stepping motor according to claim 1, characterized in that: The surface of the motor front end cover (3) is provided with a threaded hole (12) matching the motor fixing screw (11).

4. A stepping motor according to claim 1, characterized in that: The motor rear end cover (5) is provided with a through hole (14) for the motor fixing screw (11) to pass through.

5. A stepping motor according to claim 1, characterized in that: The stator core of the motor stator (2) adopts a two-phase 3.75° step angle stepping motor stator core, and the slot angle of the larger slot is 56.25°.

6. A stepping motor according to claim 1, characterized in that: The stator core of the motor stator (2) adopts a two-phase 5.625° step angle stepping motor stator core, and the slot angle of the larger slot is 61.875°.

7. A stepping motor according to claim 1, characterized in that: The stator core of the motor stator (2) adopts a two-phase 6° step angle stepping motor stator core, and the slot angle of the larger slot is 54°.

8. A stepping motor according to claim 1, characterized in that: The stator core of the motor stator (2) adopts a two-phase 7.5° step angle stepping motor stator core, and the slot angle of the larger slot is 67.5° or 52.5°.

9. A stepping motor according to claim 1, characterized in that: The stator core of the motor stator (2) adopts a two-phase 10° step angle stepping motor stator core, and the slot angle of the larger slot is 90°; Alternatively, the stator core of the motor stator (2) adopts a two-phase 11.25° step angle stepping motor stator core, and the slot angle of the larger slot is 78.75°.

10. A stepping motor according to claim 1, characterized in that: The stator core of the motor stator (2) adopts a three-phase 5.455° step angle stepper motor stator core, and the slot angle of the larger slot is 76.365°; Alternatively, the stator core of the motor stator (2) adopts a three-phase 6° or 12° step angle stepper motor stator core, and the slot angle of the larger slot is 72°; Alternatively, the stator core of the motor stator (2) adopts a three-phase 7.5° step angle stepping motor stator core, and the slot angle of the larger slot is 60°.

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