A potting method for an electric rudder

Abstract

The application relates to a potting method of an electric rudder, and belongs to the technical field of electric rudders, and solves the problem that the good high-overload protection capability and miniaturization and light weight of an existing electric rudder cannot be achieved simultaneously. The potting method of the electric rudder comprises the following steps: step 1, installing a potting tool to form a potting cavity; step 2, smearing release agent in the potting cavity; step 3, preparing potting glue; step 4, pouring the prepared potting glue into the cavity of the potting tool; step 5, curing; and step 6, demolding. The application realizes the miniaturization and light weight of the electric rudder, and the electric rudder has good high-overload protection capability.

Description

Technical Field

[0001] This invention relates to the field of electric servo motor technology, and more particularly to a potting method for an electric servo motor. Background Technology

[0002] An electric servo typically consists of a motor, controller, driver, reduction gear, and control surface locking / unlocking mechanism. The motor parameters determine the deflection speed and frequency of the control surfaces, which has a crucial impact on the servo's performance. Furthermore, a typical development trend for electric servos is to achieve lightweighting and miniaturization while ensuring high performance and high reliability. High overload resistance is a crucial indicator directly measuring the performance and reliability of a servo.

[0003] Artillery shells are launched using gunpowder. During launch, the gunpowder releases energy, subjecting the motor to excessive impact loads, with axial overloads reaching up to 10,000g and radial overloads reaching 4,000g. This harsh environment can easily damage the precision components inside the motor, such as solder joint detachment on the circuit board or deformation due to insufficient housing strength. These issues can severely affect the motor's performance, leading to servo motor failure. Therefore, a high-overload protection structure design was developed for the electric servo motor.

[0004] Currently, the main approaches to designing external high overload protection structures for motors are as follows:

[0005] 1. After the motor and other components are assembled, the entire servo motor is potted.

[0006] This method requires that there be no moving parts inside the servo motor; for example, the control surfaces do not have a folding and unfolding process, and therefore do not occupy internal space of the servo motor.

[0007] II. Separately potted motor

[0008] This method only uses potting material on the outside of the motor. Since commonly used potting materials, such as epoxy resin, silicone rubber, and polyurethane rubber, are all polymer materials, their elastic modulus is lower than that of metal materials, and their ability to resist elastic deformation is lower. Using only potting material as the motor's high overload protection structure is not ideal.

[0009] 3. Construct a metal protective shell around the motor, and then fill the shell with hot-pressed material.

[0010] This method requires adding a metal outer box to the outside of the motor, which occupies the internal space of the servo motor. This is not conducive to the current trend of miniaturization of servos. Moreover, the metal structure has a certain weight, which is also not conducive to the development of lightweight design. Summary of the Invention

[0011] Based on the above analysis, the present invention aims to provide a potting method for electric servos, in order to solve the problem that existing electric servos cannot simultaneously achieve good high overload protection capabilities with miniaturization and weight reduction.

[0012] The objective of this invention is mainly achieved through the following technical solutions:

[0013] On one hand, the present invention provides a potting method for an electric servo motor, comprising the following steps:

[0014] Step 1: Connect the motor, the strength reinforcement, and the motor mounting plate, and connect the strength reinforcement, the motor mounting plate, and the potting base plate;

[0015] Step 2: Install the potting fixture to form the potting cavity;

[0016] Step 3: Prepare the potting compound;

[0017] Step 4: Pour the prepared potting compound into the cavity of the potting fixture;

[0018] Step 5: Curing and demolding to obtain a motor and motor mounting plate assembly with a potting layer;

[0019] Step 6: Connect the motor and motor mounting plate assembly to the servo frame using the connectors.

[0020] Optionally, step 2 includes placing the potting base plate below the motor mounting plate, placing the potting baffle outside the motor, and aligning the mounting holes on the potting baffle with the mounting holes on the potting base plate.

[0021] Optionally, step 3 includes mixing epoxy resin, modified curing agent and toughening agent, followed by degassing treatment.

[0022] Optionally, the curing in step 5 is carried out at room temperature.

[0023] Optionally, step 1 may include applying silicone rubber around the motor mounting holes.

[0024] Optionally, applying silicone rubber around the motor mounting hole means applying silicone rubber to the contact surface between the motor and the strength reinforcement, and around the motor mounting hole.

[0025] Optionally, before step 1, silicone rubber may be applied around the mounting holes of the motor mounting plate.

[0026] Optionally, applying silicone rubber around the mounting holes of the motor mounting plate refers to applying it to the contact surface between the motor mounting plate and the strength reinforcement, and around the mounting holes of the motor mounting plate.

[0027] Optionally, the potting layer is cylindrical and contains multiple strength reinforcing elements.

[0028] Optionally, the upper surface of the potting layer is lower than the upper surface of the motor.

[0029] Optionally, the strength reinforcements are distributed in a dispersed manner, and the strength reinforcements are provided with through holes; the potting layer also includes holes for accommodating the motor.

[0030] Optionally, the strength reinforcement is made of metal, and the hardness of the strength reinforcement is lower than that of the connector.

[0031] Optionally, the metal includes an aluminum alloy.

[0032] Optionally, the density of the aluminum alloy is 2.8 g / cm³. 3 .

[0033] Optionally, the potting layer is made of epoxy resin.

[0034] Optionally, the density of the epoxy resin is 1.2 g / cm³. 3 .

[0035] On the other hand, the present invention also provides an electric servo motor with high overload resistance, including a motor, the aforementioned potting layer, a motor mounting plate, a servo frame, and a connector; the potting layer is disposed on the outside of the motor, the motor is connected to the motor mounting plate, and the motor mounting plate is connected to the servo frame through the connector; the connector passes through a through hole in the strength reinforcement.

[0036] Optionally, the position of the strength reinforcement corresponds to the position of the interface between the motor and the motor mounting plate.

[0037] Optionally, the position of the strength reinforcement corresponds to the position of the interface between the servo frame and the motor mounting plate.

[0038] Optionally, the connector is a screw, and an anti-loosening element is provided between the screw head and the upper surface of the strength reinforcement.

[0039] Optionally, the anti-loosening component is a spring washer.

[0040] Optionally, the height of the strength reinforcement is greater than half the height of the potting layer and less than the height of the potting layer.

[0041] Optionally, the electric servo motor also includes an anti-loosening indicator, with a central hole on the connector, at least a portion of which is located within the central hole.

[0042] Optionally, the outer wall of the anti-loosening indicator is provided with graduations.

[0043] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0044] (1) By setting a strength reinforcement in the potting layer, the present invention enhances the potting layer’s resistance to high overload, thereby improving the motor’s impact resistance, avoiding relative misalignment of internal components and connecting wires under high overload, and also improving the servo motor’s resistance to high overload.

[0045] (2) This invention selects aluminum alloy (density 2.8 g / cm³) as the material for the strength reinforcement. 3 ), and the potting material was selected as a low-density epoxy resin (density 1.2 g / cm³). 3 While ensuring high overload resistance, it meets the quality requirements of electric servo motors, allowing for greater weight space for the design of other components, and also takes into account miniaturization and lightweighting.

[0046] (3) By controlling the height of the strength reinforcement to a specific height (greater than half the height of the potting layer and less than the height of the potting layer), the present invention can ensure that the servo has good resistance to high overload and meet the space design requirements without affecting other structures.

[0047] (4) By setting through holes on the strength reinforcement, the present invention allows the connector to pass through the through holes to connect the motor to the motor mounting plate and the motor mounting plate to the servo frame. The motor volume will not be increased due to the setting of the strength reinforcement, thus achieving the combination of good high overload protection capability, miniaturization and lightweight of the electric servo.

[0048] (5) By applying silicone rubber around the mounting holes of the motor and the mounting holes of the motor mounting plate, the present invention can prevent the potting compound from flowing into the mounting holes of the motor and the mounting holes of the motor mounting plate, thus avoiding the studs being sealed and unable to be removed.

[0049] (6) The potting method of the present invention does not pot the servo motor as a whole after the motor and other components are assembled, as in the prior art, nor does it pot the motor separately. Instead, it pots the motor and the motor mounting plate as a whole, and adds strength-enhancing components during the potting process, which improves the motor's resistance to high overload and takes into account miniaturization and lightweighting.

[0050] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or may be learned by practicing the invention. Attached Figure Description

[0051] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0052] Figure 1 This is a schematic diagram of a motor high overload protection structure according to an embodiment of the present invention;

[0053] Figure 2 for Figure 1 Top view;

[0054] Figure 3 This is a schematic diagram of an unsealed electric servo motor according to an embodiment of the present invention;

[0055] Figure 4 for Figure 3 AA direction view;

[0056] Figure 5 This is a schematic diagram of the electric servo motor after potting according to an embodiment of the present invention;

[0057] Figure 6 for Figure 5 BB view in the middle.

[0058] Figure label:

[0059] 1-Motor, 2-Potent layer, 3-Connector, 4-Anti-loosening component, 5-Strength reinforcement component, 6-Motor mounting plate, 7-Stud, 8-Potent baffle, 9-Potent base plate, 10-Screw. Detailed Implementation

[0060] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0061] Example 1

[0062] Existing potting methods typically involve potting the entire servo motor after the motor and other components are assembled, or potting the motor separately.

[0063] A specific embodiment of the present invention discloses a potting method for an electric servo motor. This potting method involves potting the motor 1 and the motor mounting plate 6 together, and includes the following steps:

[0064] Step 1: Check whether the outer surfaces of motor 1 and potting fixture are smooth and flat.

[0065] Step 2: Clean the surface of motor 1 and its parts, and let them air dry.

[0066] Before potting, the surfaces of all parts and motor 1 should be thoroughly cleaned, ensuring they are free of dust, oil, and other impurities. Then, allow them to air dry to minimize the impact of impurities on the adhesion strength between the potting compound and motor 1. Cleaning and drying the surfaces of the parts and motor 1 enhances the adhesion strength between the potting compound and motor 1.

[0067] Step 3: Apply silicone rubber around the mounting hole of motor 1, align the through hole on the strength reinforcement 5 with the mounting hole of motor 1, and use studs 7 to fix motor 1, strength reinforcement 5 and motor mounting plate 6 together.

[0068] The area around the mounting hole of motor 1 refers to the contact surface between motor 1 and the strength reinforcement 5, and the area around the mounting hole of motor 1. By applying silicone rubber around the mounting hole of motor 1, potting compound can be prevented from flowing into the mounting hole of motor 1, thus avoiding sealing the stud 7 and making it impossible to remove.

[0069] Step 4: Apply silicone rubber around the mounting holes of the motor mounting plate 6, align the through holes on the strength reinforcement with the mounting holes of the motor mounting plate 6, and use studs 7 to fix the strength reinforcement 5, the motor mounting plate 6 and the potting base plate 9 in place, and prevent the potting compound from overflowing.

[0070] The area around the mounting holes of the motor mounting plate 6 refers to the area around the mounting holes on the contact surface between the motor mounting plate 6 and the strength reinforcement 5. Applying silicone rubber around the mounting holes of the motor mounting plate 6 prevents potting compound from flowing into the mounting holes and thus avoids sealing the studs 7, making them impossible to remove. After applying the silicone rubber, allow it to stand for 48 hours.

[0071] Step 5: Install the potting fixture.

[0072] Place the potting base plate 9 below the motor mounting plate 6, and place the potting baffle 8 on the outside of the motor. Align the mounting holes on the potting baffle 8 with the mounting holes on the potting base plate 9, and secure them together with screws 10 to form a potting cavity. The motor potting fixture installation is now complete.

[0073] A spring washer and a protective element are sequentially provided between the upper surface of the potting base plate 9 and the lower surface of the screw head.

[0074] The functions of spring washers are twofold: first, to prevent loosening; and second, to automatically eject the screw 10 after it has been loosened to a certain extent, reducing the workload of the operator. Protective components reduce friction and prevent scratches on the product surface.

[0075] Step 6: Apply release agent to the potting cavity to facilitate removal of the tooling after the potting compound has cured.

[0076] Step 7: Prepare the potting compound.

[0077] The potting material is measured according to the volume and proportion requirements of the potting cavity, and then mixed and stirred to obtain the potting adhesive.

[0078] The potting material includes epoxy resin, a modified curing agent, and a toughening agent. During the mixing and stirring of the potting material, a chemical reaction occurs, generating air bubbles. These bubbles can remain in the potting compound, affecting the potting effect. Therefore, this embodiment also includes a de-airing treatment of the potting compound. For example, a vacuum method is used to extract the air bubbles from the potting compound.

[0079] Step 8: Filling and sealing.

[0080] Pour the prepared potting compound into the potting cavity. The potting height shall not exceed the upper end face of the potting baffle 8.

[0081] Step 9: Curing.

[0082] The potted product is left at room temperature for 20-30 hours to cure. Preferably, the curing time is 24 hours.

[0083] Step 10: Demolding.

[0084] After the potting compound has completely cured, remove the potting fixture to obtain the motor and motor mounting plate assembly with the potting layer. Check the potting layer for air bubbles, complete filling, and impurities.

[0085] Step 11: Assembly.

[0086] The electric servo is assembled by fastening the motor and motor mounting plate assembly to the servo frame using connectors (such as screws).

[0087] Step 12: Performance Testing. Perform an overload test on the servo motor to ensure it functions properly and meets usage requirements.

[0088] Example 2

[0089] A specific embodiment of the present invention discloses a servo motor high overload protection structure, such as... Figure 1 and Figure 2 As shown, the encapsulation layer 2 is obtained by the encapsulation method of Embodiment 1. The encapsulation layer 2 is cylindrical and contains a plurality of strength reinforcing members 5, which are dispersedly arranged; the encapsulation layer 2 also includes holes (not shown in the figure) for accommodating a motor.

[0090] The advantage of dispersing the strength reinforcement 5 within the potting layer 2 is that it can disperse radial impact force.

[0091] The strength reinforcement 5 and the potting layer 2 are not separate components, but rather form a single unit. This design allows for resistance to radial impacts from the motor.

[0092] The strength reinforcement 5 is made of metal, and its hardness is lower than that of the connector 3 that connects the motor 1 and the motor mounting plate 6, as well as the hardness of the connector 3 that connects the servo frame and the motor mounting plate 6. In this embodiment, the hardness of the strength reinforcement 5 is limited to be lower than that of the connector 3, so that there is a certain amount of compression space during the tightening process, which plays a certain role in buffering and better reducing impact load.

[0093] In one possible implementation, the strength reinforcement 5 has a through hole for the connector 3 to pass through; that is, the strength reinforcement 5 is a ring-shaped structure, such as a pressure ring. Exemplarily, the strength reinforcement 5 is made of aluminum alloy. The aluminum alloy used in this embodiment has a density of 2.8 g / cm³. 3 .

[0094] The height of the strength reinforcement 5 within the potting layer 2 is a key factor affecting high overload resistance, determined by the height of the potting layer. In a preferred embodiment, the height of the strength reinforcement 5 is set to be greater than half the height of the potting layer and less than the height of the potting layer. Setting the height of the strength reinforcement 5 within this specific range ensures that the servo has good high overload resistance while meeting space design requirements and not affecting other structures. For example, the height of the strength reinforcement 5 is 30-60mm.

[0095] In another possible implementation, the material of the potting layer 2 is a potting compound, which is mainly composed of epoxy resin and also includes a modified curing agent and a toughening agent.

[0096] Compared to metal materials, epoxy resin has a lower elastic modulus and relatively lower strength, resulting in a slightly weaker overload protection effect for motor 1. The strength reinforcement 5 within the potting layer 2 is equivalent to adding a metal skeleton to the epoxy resin to increase the high overload resistance of the potting layer 2. The density of the epoxy resin is 1.2 g / cm³. 3 .

[0097] In this embodiment, low-density aluminum alloy and epoxy resin are used to meet the lightweight requirements of the electric servo motor while ensuring high overload strength, thus providing more space for the design of other components.

[0098] Example 3

[0099] Another specific embodiment of the present invention discloses an electric servo motor with high overload resistance, such as... Figures 3-6 As shown, it includes a motor 1, a potting layer obtained by the potting method of Embodiment 1, a motor mounting plate 6, a servo frame, and a connector 3; the potting layer 2 is located on the outside of the motor 1, and the motor 1 is connected to the motor mounting plate 6 and the motor mounting plate 6 is connected to the servo frame through the connector 3.

[0100] The connector 3 passes through the through hole on the strength reinforcement 5, and the upper surface of the potting layer 2 is lower than the upper surface of the motor 1.

[0101] In this embodiment, the motor mounting plate 6 not only serves to fix the motor 1, but also offsets most of the axial impact force, thus protecting the motor axially.

[0102] The positions of multiple strength reinforcements 5 in the potting layer correspond to the positions at the interfaces between the motor 1 and the motor mounting plate 6, and between the servo frame and the motor mounting plate 6, respectively, so that the connecting piece 3 passes through the through holes on the strength reinforcements 5 to connect the motor 1 and the motor mounting plate 6, and the servo frame and the motor mounting plate 6. For example, the connecting piece 3 is a screw, such as a 12.9 grade strength screw, to resist large impact loads and increase high overload resistance.

[0103] The number of strength reinforcement members 5 is determined based on the size of the motor 1. While meeting space requirements, the multiple strength reinforcement members 5 are arranged as evenly as possible to disperse the radial impact force. For example, there are six strength reinforcement members 5.

[0104] It should be noted that the function of the three strength reinforcements 5 in the inner ring is to fix the motor to the motor mounting plate, and the function of the three strength reinforcements in the outer ring is to fix the motor mounting plate to the servo frame.

[0105] In a preferred embodiment, an anti-loosening element 4 is further provided between the screw head and the upper surface of the strength reinforcement 5. For example, a spring washer. By providing the anti-loosening element 4, it can prevent loosening on the one hand; on the other hand, it can automatically eject the screw after the connector 3 is loosened to a certain extent, reducing the workload of the operator.

[0106] In a preferred embodiment, the electric servo motor further includes an anti-loosening indicator to assist in determining whether the connector is loose. The connector has a central hole, and at least a portion of the anti-loosening indicator is positioned within this central hole. The positional relationship between the anti-loosening indicator and the central hole determines whether the connector is loose and the degree of looseness.

[0107] Specifically, initially, the anti-loosening indicator is completely placed inside the central hole, and its upper surface is flush with the upper surface of the connector. When the connector becomes loose, it moves upward, causing the upper surface of the anti-loosening indicator to be lower than the upper surface of the connector, thus indicating that the connector is loose. The degree to which the upper surface of the anti-loosening indicator is lower than the upper surface of the connector indicates the extent of the looseness.

[0108] In another possible implementation, a scale can be provided on the outer wall of the anti-loosening indicator, with a portion of the anti-loosening indicator placed inside the central hole and a portion outside the central hole. The degree of looseness of the connector is determined by the change in the scale on the outer wall of the anti-loosening indicator.

[0109] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A potting method for an electric servo motor, characterized in that, Includes the following steps: Step 1: Connect the motor, the strength reinforcement, and the motor mounting plate, and connect the strength reinforcement, the motor mounting plate, and the potting base plate; Step 2: Install the potting fixture to form the potting cavity; Step 3: Prepare the potting compound; Step 4: Pour the prepared potting compound into the cavity of the potting fixture; Step 5: Curing and demolding to obtain a motor and motor mounting plate assembly with a potting layer; Step 6: Connect the motor and motor mounting plate assembly to the servo frame using the connectors; The electric servo motor includes a motor, a potting layer, a motor mounting plate, a servo motor frame, and connectors; the potting layer is located on the outside of the motor, and the motor is connected to the motor mounting plate, and the motor mounting plate is connected to the servo motor frame, all via the connectors; The potting layer is cylindrical and contains multiple strength reinforcing members that are dispersedly arranged and have through holes; the potting layer also includes holes for accommodating a motor. The connector passes through a through hole in the strength reinforcement to connect the motor to the motor mounting plate and the servo frame to the motor mounting plate.

2. The potting method according to claim 1, characterized in that, Step 2 includes placing the potting base plate below the motor mounting plate, placing the potting baffle outside the motor, and aligning the mounting holes on the potting baffle with the mounting holes on the potting base plate.

3. The potting method according to claim 1 or 2, characterized in that, Step 3 includes mixing epoxy resin, modified curing agent and toughening agent, followed by degassing treatment.

4. The potting method according to claim 3, characterized in that, The curing in step 5 is carried out at room temperature.

5. The potting method according to claim 1, characterized in that, Before step 1, silicone rubber is applied around the motor mounting holes.

6. The potting method according to claim 5, characterized in that, Applying silicone rubber around the motor mounting hole refers to applying silicone rubber to the contact surface between the motor and the strength reinforcement, and around the motor mounting hole.

7. The potting method according to claim 1, characterized in that, Before step 1, silicone rubber is applied around the mounting holes of the motor mounting plate.

8. The potting method according to claim 7, characterized in that, Applying silicone rubber around the mounting holes of the motor mounting plate refers to applying it to the contact surface between the motor mounting plate and the strength reinforcement, and around the mounting holes of the motor mounting plate.

9. The potting method according to claim 1, characterized in that, The upper surface of the potting layer is lower than the upper surface of the motor.

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