Stepping motor with integrated ground terminal

Abstract

The utility model discloses a step motor of cover plate integrated grounding terminal, including motor assembly and the cover plate of being located motor assembly one end, and the output shaft of motor assembly is through the cover plate and is stretched out, the outer edge of cover plate extends the grounding sheet for connecting with the grounding terminal, and the grounding sheet is integrally formed with the cover plate, the utility model discloses simple structure, and the edge extension of cover plate is prolonged, forms integral type grounding sheet cover plate, reduces the possible of part reprocessing and assembly, and its forming process only needs to have the position of grounding sheet when stamping casting, greatly saves the manual cost of compared with grounding sheet welding, grounding connection circuit board etc, and the grounding sheet is connected with the grounding terminal of outside, does not occupy the internal space of motor, and the installation is relatively convenient.

Description

Technical Field

[0001] This utility model relates to the field of stepper motor design technology, and in particular to a stepper motor with an integrated grounding terminal on the cover plate. Background Technology

[0002] Permanent magnet geared stepper motors are widely used in various applications requiring precise control and positioning. The operating environment of these motors varies depending on the customer's application. With the increasing prevalence of control circuits and terminal contacts connecting to the power supply, applications requiring grounding terminals on the motor have emerged. This connects the motor's metal casing or other conductive parts to the ground, forming a low-reactance current loop and enhancing safety.

[0003] Existing grounding methods for motors employ an external grounding bolt structure installed through mounting holes in the motor cover. This bolt grounding structure is complex, prone to poor contact with the mounting holes, and occupies installation space. Another grounding method involves leading grounding pins or other metal conductors from the motor housing or cover and soldering them to the circuit board or connecting them to connectors on the motor (e.g., patent number CN202211708500.1). Grounding via the circuit board or connectors has low weld strength and is prone to detachment, while the connector-to-connector structure occupies the original internal space of the motor. To avoid connection failure, the grounding pin requires high-precision manufacturing processes. Therefore, a stepper motor with a simple grounding structure and good connection stability needs to be designed. Utility Model Content

[0004] To address the technical problems of complex structure, easy detachment, or high manufacturing cost of existing stepper motor grounding methods, this utility model provides a stepper motor with an integrated grounding terminal on the cover plate to solve the above problems.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a stepper motor with a cover plate integrated with a grounding terminal, including a motor assembly and a cover plate located at one end of the motor assembly, the output shaft of the motor assembly extending through the cover plate; the outer edge of the cover plate extends out a grounding piece for connection with a grounding terminal, and the grounding piece is integrally formed with the cover plate.

[0006] In an optional embodiment of this utility model, the motor assembly is provided with a terminal box on its side, and the grounding plate is located at a position opposite to the cut surface of the cover plate that mates with the terminal box.

[0007] In an optional embodiment of this utility model, the grounding plate includes a grounding plane and a grounding inclined plane connected at their ends. The grounding plane is coplanar with the cover plate, and the angle α1 between the grounding inclined plane and the grounding plane is an obtuse angle.

[0008] In an optional embodiment of this utility model, the included angle α1 = 145°.

[0009] In an optional embodiment of this utility model, the end of the grounding plate has a chamfered portion, and the chamfer b on the side of the chamfered portion in the width direction is 10°~12°.

[0010] In an optional embodiment of this utility model, the thickness d of the grounding piece is 0.7mm~0.8mm.

[0011] In an optional embodiment of this utility model, a small hole is provided on the grounding inclined surface of the grounding plate, and when the grounding plate is inserted into the grounding terminal, the protrusion of the grounding terminal is engaged in the small hole.

[0012] In an optional embodiment of this utility model, the grounding slope includes a wide section and a narrow section. The wide section is connected to the grounding plane. A shoulder is formed at the connection between the wide section and the narrow section, facing the end of the grounding plate. The width L2 of the wide section is greater than the width L3 of the grounding terminal, and the maximum width L1 of the narrow section is less than the width L3 of the grounding terminal.

[0013] In an optional embodiment of this utility model, the two end faces of the grounding inclined surface in the thickness direction are parallel to each other.

[0014] In an optional embodiment of this utility model, the motor assembly includes a housing, a spring plate, a rotor assembly, a stator assembly, a fixed plate assembly, an output shaft, a gear assembly, and a terminal box. The spring plate is located on the inner bottom surface of the housing, the rotor assembly is located inside the stator assembly, the stator assembly, the fixed plate assembly, and the gear assembly are arranged sequentially along the axial direction, the rotor assembly is connected to the output shaft through the gear assembly, and the cover plate is riveted to one end of the housing.

[0015] In an optional embodiment of this utility model, when the small hole mates with the protrusion of the grounding terminal, the end of the grounding plate abuts against the baffle.

[0016] The beneficial effects of this utility model are: (1) The structure of this utility model is simple. The grounding piece extends out from the edge of the cover plate to form an integrated grounding piece cover plate, which reduces the possibility of reprocessing and assembly of parts. Its forming process only requires leaving the position of the grounding piece during stamping and casting, which greatly saves the labor cost compared to welding the grounding piece and connecting the grounding circuit board. Moreover, the grounding piece is connected to the external grounding terminal, which does not occupy the internal space of the motor and is relatively convenient to install.

[0017] (2) This utility model reasonably arranges the position of the grounding plate without affecting the riveting of the cover plate and the assembly of the terminal box, so as to ensure the normal installation of the motor.

[0018] (3) Through the reasonable design of the structure and size of the grounding plate, this utility model makes the connection between the grounding plate and the grounding terminal more stable and faster. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is an exploded view of a specific embodiment of the stepper motor with integrated grounding terminal on the cover plate described in this utility model; Figure 2 This is a perspective view of a specific embodiment of the stepper motor with integrated grounding terminal on the cover plate according to the present invention; Figure 3 This is a schematic diagram of the grounding current on the surface of the stepper motor described in this utility model; Figure 4 This is a top view of the present invention; Figure 5 This is a front view of the cover plate in this utility model; Figure 6 yes Figure 5 Enlarged view of point A in the middle; Figure 7 This is an enlarged view of the end of the grounding plate in this utility model; Figure 8 This is a perspective view of the grounding terminal that is connected to the grounding plate in this utility model; Figure 9 yes Figure 8 The diagram shows the dimensions of the grounding terminal. Figure 10 yes Figure 8 Side view of the grounding terminal shown.

[0021] In the diagram, 1. Motor assembly, 101. Output shaft, 102. Housing, 1021. U-shaped opening, 103. Spring plate, 104. Rotor assembly, 105. Stator assembly, 106. Fixing plate assembly, 107. Gear assembly, 108. Terminal box, 2. Cover plate, 201. Cut surface, 3. Shoulder, 4. Grounding terminal, 401. Protrusion, 402. Baffle, 5. Grounding plate, 501. Grounding plane, 502. Grounding slope, 5021. Chamfered part of the slope, 5022. Wide section, 5023. Narrow section, 6. Rivet foot, 7. Small hole. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] Example 1 like Figure 2 As shown, a stepper motor with an integrated grounding terminal in the cover plate includes a motor assembly 1 and a cover plate 2 located at one end of the motor assembly 1. The output shaft 101 of the motor assembly 1 extends through the cover plate 2. A grounding piece 5 extends from the outer edge of the cover plate 2 for connection with a grounding terminal 4, and the grounding piece 5 is integrally formed with the cover plate 2.

[0024] The grounding piece 5 and the cover plate 2 are integrally formed by stamping and casting process, which is simple in structure and reduces the possibility of reprocessing and assembly of parts. The forming process only requires leaving the position of the grounding piece 5 during stamping and casting, which greatly saves the labor costs compared to welding the grounding piece and connecting the circuit board.

[0025] The cover plate 2 is usually made of steel, and the grounding piece 5 is also made of steel. The integrated material strength is stronger than that of the circuit board material welded grounding piece. The grounding connection with bolts has the risk of loose bolts and is complicated to install. The integrated cover plate grounding piece method is more stable and the grounding piece 5 is not easy to fall off, thereby improving the problems of poor grounding contact, complex product structure and insufficient material strength.

[0026] like Figure 1 As shown, the motor assembly 1 typically includes a housing 102, a spring plate 103, a rotor assembly 104, a stator assembly 105, a fixing plate assembly 106, an output shaft 101, a gear assembly 107, and a terminal box 108. The housing 102 is a cavity with one open end, and a cover plate 2 is riveted to the open end of the housing 102. The spring plate 103, rotor assembly 104, stator assembly 105, fixing plate assembly 106, and gear assembly 107 are located inside the housing 102. The spring plate 103 is located on the inner bottom surface of the housing 102, and the rotor assembly 104 is located at the center of the stator assembly 105. The stator assembly 105, fixing plate assembly 106, and gear assembly 107 are arranged sequentially along the axial direction. The rotor assembly 104 is connected to the output shaft 101 via the gear assembly 107. The outer circumferential surface of the housing 102 has a U-shaped opening 1021, and the terminal box 108 is connected to the insertion end of the stator assembly 105 via the U-shaped opening 1021.

[0027] The grounding plate 5 and grounding terminal 4, connected via PS series connectors, reduce component complexity and space occupation, enabling the motor to be grounded. This ensures that conductive metal parts such as the housing 102, output shaft 101, and cover plate 2 are connected to the grounding terminal 4 via the grounding plate 5, with the final lead-out wire grounded to the earth, forming a low-reasonable current loop. Figure 3 Analysis shows that when current flows through the metal conductor of the motor, I1 or I2 will eventually be connected to the ground through the I3 grounding terminal after passing through the motor. This means that when the current is conducted and grounded, it makes the use safer.

[0028] In a preferred embodiment, the grounding plate 5 is located at a position opposite to the cut surface 201 where the cover plate 2 mates with the outlet box 108. As Figure 4 shown, since the cover plate 2 needs to be riveted to the housing 102 during the production of the stepper motor, its tooling die needs to avoid the rivet legs 6 and the mounting holes of the cover plate 2. The grounding plate 5 generally extends from the position opposite to the outlet box 108, which does not interfere with the connecting wires led out from the outlet box 108 during installation, nor does it interfere with the rivet legs 6 when the cover plate 2 is riveted.

[0029] Second Embodiment On the basis of the above embodiments, this embodiment elaborately designs the structure of the grounding plate 5.

[0030] The grounding plate 5 includes a grounding plane 501 and a grounding inclined surface 502 that are connected at their ends. The grounding plane 501 is coplanar with the cover plate 2, and the included angle α1 between the grounding inclined surface 502 and the grounding plane 501 is an obtuse angle. As Figure 5 shown, the overall shape of the grounding plate 5 and the cover plate 2 presents an L-shape. The grounding inclined surface 502 is used for plugging with the grounding terminal 4. The arrangement of the grounding plane 501 is to extend the starting point of the grounding inclined surface 502 outward to form a certain distance from the edge of the cover plate 2, so as to ensure no interference during planar installation with the grounding terminal 4. The obtuse included angle α1 can ensure that the grounding plate 5 does not contact the surface of the housing 102, and can be connected downward to the grounding terminal 4 for grounding, so that the grounding plate 5 can stably perform its own function. In this embodiment, the included angle α1=145°. In a preferred embodiment, the two end faces of the grounding inclined surface 502 in the thickness direction are parallel to each other, so that the grounding inclined surface 502 can fit more tightly when mating with the grounding terminal 4 to avoid shaking.

[0031] In order to fix the grounding plate 5 and the grounding terminal 4, the grounding inclined surface 502 of the grounding plate 5 is usually provided with a small hole 7 (as Figure 7 shown), when the grounding plate 5 is inserted into the grounding terminal 4, the protrusion 401 of the grounding terminal 4 snaps into the small hole 7.

[0032] The structure of the grounding terminal 4 is as Figures 8-10As shown, to ensure successful connection between the grounding piece 5 and the grounding terminal 4, a baffle 402 is provided on the grounding terminal 4. When the small hole 7 engages with the protrusion 401 of the grounding terminal 4, the end of the grounding piece 5 abuts against the baffle 402. The baffle 402 can buffer the insertion force when the grounding piece 5 is inserted. The baffle 402 has an elastic deformation function, allowing the grounding piece 5 to be inserted into the direction of the baffle 402 with an interference fit. After the grounding piece 5 is inserted, the baffle 402 and the protrusion 16 together hold the grounding piece 5 in place, making the grounding piece 5 fit more closely and seamlessly with the grounding terminal 4. Under the squeezing action of the baffle 402, the grounding piece 5 is not easily detached from the protrusion 401. The overall structure has no shaking effect, reducing the vibration noise of parts generated during motor operation, greatly improving noise, and increasing structural stability. When replacing the grounding terminal 4, press and hold the baffle 402, and the grounding plate 5 can be moved towards the baffle 402 and moved out of the small hole 401, thus making it easy to replace the new grounding terminal 4. Compared with the structure of the grounding terminal welded on the circuit board in the prior art, this utility model is easy to disassemble and rework, which greatly improves the cost of replacing the whole machine because the grounding terminal 4 cannot be removed during production or use, and improves the recyclability of parts.

[0033] Example 3 Based on Example 2, such as Figure 6 As shown, the end of the grounding piece 5 has a chamfered portion 5021, and the chamfer b on the side of the chamfered portion 5021 in the width direction is 10°~12°. During production, it can be effectively inserted or pulled out of the grounding terminal 4, reducing the loss of insertion or extraction force, saving time and effort, and facilitating the replacement of the grounding terminal 4.

[0034] The dimensions of the grounding piece 5 (including thickness and width) are set according to the dimensions of the grounding terminal 4. Analyzing the thickness of the grounding piece 5, the thickness d is preferably 0.7mm~0.8mm, making it suitable for mating with PS-187 series or PS-250 series connectors. These connectors can be stably matched with the grounding piece 5. Figure 8 The grounding terminal 4 is selected when the thickness d of the grounding piece 5 is 0.8 mm.

[0035] Analyzing from the width direction of the grounding piece 5, the maximum width L1 of the portion of the grounding piece 5 inserted into the grounding terminal 4 should be less than the width L3 of the grounding terminal 4. In this embodiment, in order to limit the insertion depth of the grounding terminal 4, preferably, the grounding slope 502 includes a wide section 5022 and a narrow section 5023. As the names suggest, the wide section 5022 has a larger width, and the narrow section 5023 has a smaller width. The wide section 5022 is connected to the grounding plane 501. The connection between the wide section 5022 and the narrow section 5023 forms a shoulder 3 facing the end of the grounding piece 5. The width L2 of the wide section 5022 is greater than the width L3 of the grounding terminal 4, and the maximum width L1 of the narrow section 5023 is less than the width L3 of the grounding terminal 4 (e.g., ...). Figure 7 and Figure 9 As shown), that is, L2 > L3 > L1. When the shoulder 3 is connected to the grounding terminal 4, it can play a limiting role, allowing the grounding terminal 4 to move upwards from the grounding plate 5 to the shoulder 3 as far as possible.

[0036] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0037] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A stepper motor with an integrated grounding terminal on the cover plate, characterized in that: Includes a motor assembly (1) and a cover plate (2) located at one end of the motor assembly (1), the output shaft (101) of the motor assembly (1) extends through the cover plate (2); the outer edge of the cover plate (2) extends out to form a grounding piece (5) for connection with a grounding terminal (4), and the grounding piece (5) is integrally formed with the cover plate (2).

2. The stepper motor with integrated grounding terminal on the cover plate according to claim 1, characterized in that: The motor assembly (1) has a terminal box (108) on its side, and the grounding plate (5) is located opposite to the cut surface (201) of the cover plate (2) that mates with the terminal box (108).

3. The stepper motor with integrated grounding terminal on the cover plate according to claim 1, characterized in that: The grounding plate (5) includes a grounding plane (501) and a grounding inclined plane (502) connected at the ends. The grounding plane (501) is coplanar with the cover plate (2), and the angle α1 between the grounding inclined plane (502) and the grounding plane (501) is an obtuse angle.

4. The stepper motor with integrated grounding terminal on the cover plate according to claim 3, characterized in that: The included angle α1 = 145°.

5. The stepper motor with integrated grounding terminal on the cover plate according to claim 1, characterized in that: The end of the grounding piece (5) has a chamfered portion (5021), and the chamfered portion (5021) has a chamfered angle b on the side in the width direction of the chamfered portion (5021) of 10°~12°.

6. The stepper motor with integrated grounding terminal on the cover plate according to claim 1, characterized in that: The thickness d of the grounding piece (5) is 0.7mm~0.8mm.

7. The stepper motor with integrated grounding terminal on the cover plate according to claim 3, characterized in that: The grounding plate (5) has a small hole (7) on its grounding inclined surface (502). When the grounding plate (5) is inserted into the grounding terminal (4), the protrusion (401) of the grounding terminal (4) is inserted into the small hole (7).

8. The stepper motor with integrated grounding terminal on the cover plate according to claim 3, characterized in that: The grounding slope (502) includes a wide section (5022) and a narrow section (5023). The wide section (5022) is connected to the grounding plane (501). The connection between the wide section (5022) and the narrow section (5023) forms a shoulder (3) facing the end of the grounding plate (5). The width L2 of the wide section (5022) is greater than the width L3 of the grounding terminal (4), and the maximum width L1 of the narrow section (5023) is less than the width L3 of the grounding terminal (4).

9. The stepper motor with integrated grounding terminal on the cover plate according to claim 3, characterized in that: The two end faces of the grounding inclined surface (502) are parallel to each other in the thickness direction.

10. The stepper motor with integrated grounding terminal on the cover plate according to claim 1, characterized in that: The motor assembly (1) includes a housing (102), a spring plate (103), a rotor assembly (104), a stator assembly (105), a fixing plate assembly (106), an output shaft (101), a gear assembly (107), and a terminal box (108). The spring plate (103) is located on the inner bottom surface of the housing (102), and the rotor assembly (104) is located inside the stator assembly (105). The stator assembly (105), the fixing plate assembly (106), and the gear assembly (107) are arranged sequentially along the axial direction. The rotor assembly (104) is connected to the output shaft (101) through the gear assembly (107). The cover plate (2) is riveted to one end of the housing (102).

11. The stepper motor with integrated grounding terminal on the cover plate according to claim 7, characterized in that: When the small hole (7) engages with the protrusion (401) of the grounding terminal (4), the end of the grounding piece (5) abuts against the baffle (402).

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