Encapsulation device and encapsulation method for motor stator and feedback device

Abstract

The invention relates to the technical field of motor potting, and discloses a potting device and a potting method for a motor stator and a feedback device. The device comprises a feedback device base plate which is hollow and circular, one end of the feedback device base plate is provided with a plurality of positioning clamping tables used for positioning a feedback device, and the other end of the feedback device base plate is provided with a marking groove used for aligning a motor stator iron core in the circumferential direction; the stator pressing tool is cylindrical, and a step surface is arranged at the position of the middle section of the cylinder and used for applying pressure to the step surface of the inner circle of the motor stator; the encapsulation tool assembly comprises a first encapsulation tool and a second encapsulation tool, a first cylinder on the first encapsulation tool is in close fit with the inner circle of the non-wire outlet end of the machine shell, a second cylinder is in close fit with the inner circle of the stator, the outer diameter of the first cylinder is larger than that of the second cylinder, and a round hole in the second encapsulation tool is in close fit with the outer diameter of the wire outlet end of the machine shell; the pouring sealant is prevented from overflowing, and the first pouring tool and the second pouring tool are matched with the part to be poured to form a pouring cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of motor potting, and in particular to a potting device and a potting method for a motor stator and a feedback device. Background Art

[0002] With the development of motor technology, the requirements for motor performance are getting higher and higher. For example, the motor is required to be small in size, high in power density, and high in reliability. In addition, in some application fields, the working environment of the motor is relatively harsh, and the motor needs to be able to resist external impact and vibration. At present, the solution of epoxy encapsulation of the motor stator winding is mostly adopted. After epoxy encapsulation, the motor stator winding can greatly enhance its own impact resistance.

[0003] However, the motor includes feedback devices in addition to the stator windings, and merely improving the shock resistance of the stator windings cannot improve the shock resistance of the motor as a whole. Summary of the invention

[0004] The present invention provides a potting device and a potting method for a motor stator and a feedback device, which can solve the technical problems in the prior art.

[0005] The present invention provides a potting device for a motor stator and a feedback device, wherein the device comprises:

[0006] A feedback device pad, which is a hollow circular plate, with multiple positioning clamps at one end for positioning the feedback device, and a marking groove at the other end for aligning the motor stator core in the circumferential direction;

[0007] The stator pressing tool is cylindrical, and a step surface is provided at the middle section of the cylinder, which is used to apply pressure to the step surface of the inner circle of the motor stator;

[0008] A potting tool assembly includes a first potting tool and a second potting tool. The first cylinder on the first potting tool is tightly matched with the inner circle of the non-outlet end of the casing, and the second cylinder is tightly matched with the inner circle of the stator to prevent the potting glue from leaking out. The outer diameter of the first cylinder is larger than the outer diameter of the second cylinder. The circular hole on the second potting tool is tightly matched with the outer diameter of the outlet end of the casing to prevent the potting glue from overflowing. The first potting tool and the second potting tool cooperate with the potted parts to form a potting cavity, and the potting cavity contains the potted stator winding and the feedback device.

[0009] Preferably, the number of positioning card stations is 3.

[0010] Preferably, the outer diameter of the first cylinder is 16.4 mm, the outer diameter of the second cylinder is 8.8 mm, and the inner diameter of the circular hole is 18 mm.

[0011] The present invention also provides a potting method performed by using the potting device of the motor stator and feedback device, wherein the method comprises:

[0012] S1, putting the feedback device pad on the stator output terminal winding, aligning it with the motor stator core through the marking groove, applying adhesive on the contact surface, making the bottom surface of the feedback device pad fit with the stator end surface, and curing it at room temperature for a first predetermined time;

[0013] S2, applying adhesive on the outer surface of the stator, aligning the root of the stator lead wire with the center line of the housing lead hole, pressing the stator to the corresponding position of the housing using a stator pressing tool, and curing it at room temperature for a first predetermined time;

[0014] S3, with the chip of the feedback device facing the stator, the three grooves on the circuit board of the feedback device are correspondingly buckled onto the three positioning cards of the backing plate of the feedback device, and adhesive is applied to the contact points between the grooves and the positioning cards, and cured at room temperature for a first predetermined time;

[0015] S4, evenly apply an inorganic thickener on the outer surface of the first potting tool, assemble the stator onto the first potting tool with the non-outlet end of the stator facing downward, so that the end face of the housing at the non-outlet end of the stator fits with the end face of the first potting tool, then evenly apply an inorganic thickener on the outer surface of the housing and the outlet hole, and put the assembly of the first potting tool and the stator into a high temperature box at 70° C. for preheating for a second predetermined time;

[0016] S5, preparing epoxy potting glue according to a predetermined ratio, stirring the glue liquid evenly after preparing the glue, and putting it into a vacuum box to evacuate;

[0017] S6, after the preheating of the assembly of the first potting tool and the stator and the vacuuming of the potting glue are synchronously completed, the epoxy potting glue is poured into the assembly of the first potting tool and the stator, and when the liquid level of the epoxy potting glue is consistent with the feedback device, the second potting tool is assembled to the end face of the casing;

[0018] S7, placing the assembly of the first potting tool, the second potting tool and the stator into a vacuum box to evacuate;

[0019] S8, taking out the assembly of the first potting tool, the second potting tool and the stator. If the liquid level of the epoxy potting glue is lower than the feedback device, add epoxy potting glue until it is flush with the feedback device and perform a secondary vacuum operation;

[0020] S9, after potting is completed, remove the second potting tool and clean the glue stains on the inner wall of the casing;

[0021] S10, placing the potted stator together with the first potting tool into a high temperature box at 80°C and heating for a third predetermined time, then raising the temperature to 120°C, heating for a third predetermined time, and then naturally cooling down in the box.

[0022] Preferably, the binder is Loctite 914 instant adhesive, and the inorganic thickener is silicone grease.

[0023] Preferably, the first predetermined time is 15 minutes, the second predetermined time is 30 minutes, the third predetermined time is 2 hours, and the predetermined ratio is 2:1.

[0024] Preferably, the vacuum box parameters in S5 are set as follows: temperature 60° C., pressure 100 Pa, and time 5 minutes; and the vacuum box parameters in S7 are set as follows: temperature 60° C., pressure 100 Pa, and time 10 minutes.

[0025] Preferably, the epoxy potting glue is poured into the assembly of the first potting tool and the stator at least twice, and a pause of 1-2 minutes is made after each pouring to allow the glue to fill the entire assembly of the first potting tool and the stator.

[0026] Through the above technical scheme, the motor stator and the feedback device can be potted with potting glue at the same time, the potting cavity is well sealed, vacuum potting can be performed, and demolding is easy, which greatly enhances the overall impact resistance of the motor and solves the problem that the motor stator and the feedback device are easily damaged when subjected to high impact. In addition, the potting device described in the present invention has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram showing the structure of positioning the feedback device using a feedback device pad and the motor stator thereof according to an embodiment of the present invention;

[0029] Figure 2 A schematic diagram showing a method of pressing a stator into a casing using a stator pressing tool according to an embodiment of the present invention is shown;

[0030] Figure 3 It is a schematic diagram of the structure after the feedback device pad, feedback device, stator and housing are assembled according to an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a first potting tool according to an embodiment of the present invention;

[0032] Figure 5 is a schematic diagram of a second potting tool according to an embodiment of the present invention;

[0033] Figure 6 It is a structural schematic diagram of a potting operation according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0037] like Figure 1-5 As shown, an embodiment of the present invention provides a potting device for a motor stator and a feedback device, wherein the device comprises:

[0038] A feedback device pad, which is a hollow circular plate, with multiple positioning clamps at one end for positioning the feedback device, and a marking groove at the other end for aligning the motor stator core in the circumferential direction;

[0039] The stator pressing tool is cylindrical, and a step surface is provided at the middle section of the cylinder, which is used to apply pressure to the step surface of the inner circle of the motor stator;

[0040] A potting tool assembly includes a first potting tool (potting tool A) and a second potting tool (potting tool B). The first cylinder on the first potting tool is tightly matched with the inner circle of the non-outlet end of the casing, and the second cylinder is tightly matched with the inner circle of the stator to prevent the potting glue from leaking out. The outer diameter of the first cylinder is larger than the outer diameter of the second cylinder. The circular hole on the second potting tool is tightly matched with the outer diameter of the outlet end of the casing to prevent the potting glue from overflowing. The first potting tool and the second potting tool cooperate with the potted parts to form a potting cavity, and the potting cavity contains the potted stator winding and feedback device.

[0041] Through the above technical scheme, the motor stator and the feedback device can be potted with potting glue at the same time, the potting cavity is well sealed, vacuum potting can be performed, and demolding is easy, which greatly enhances the overall impact resistance of the motor and solves the problem that the motor stator and the feedback device are easily damaged when subjected to high impact. In addition, the potting device described in the present invention has a simple structure and low cost.

[0042] According to an embodiment of the present invention, the number of positioning card stations is 3.

[0043] According to one embodiment of the present invention, the outer diameter of the first cylinder is 16.4 mm, the outer diameter of the second cylinder is 8.8 mm, and the inner diameter of the circular hole is 18 mm. Figure 4 and 5 shown.

[0044] The embodiment of the present invention further provides a potting method performed by using the potting device of the motor stator and feedback device, wherein the method comprises:

[0045] S1, putting the feedback device pad on the stator output terminal winding, aligning it with the motor stator core through the marking groove, applying adhesive on the contact surface, making the bottom surface of the feedback device pad fit with the stator end surface, and curing it at room temperature for a first predetermined time;

[0046] S2, applying adhesive on the outer surface of the stator, aligning the root of the stator lead wire with the center line of the housing lead hole, pressing the stator to the corresponding position of the housing using a stator pressing tool, and curing it at room temperature for a first predetermined time;

[0047] S3, with the chip of the feedback device facing the stator, the three grooves on the circuit board of the feedback device are correspondingly buckled onto the three positioning cards of the backing plate of the feedback device, and adhesive is applied to the contact points between the grooves and the positioning cards, and cured at room temperature for a first predetermined time;

[0048] S4, evenly apply an inorganic thickener on the outer surface of the first potting tool, assemble the stator onto the first potting tool with the non-outlet end of the stator facing downward, so that the end face of the housing at the non-outlet end of the stator fits with the end face of the first potting tool, then evenly apply an inorganic thickener on the outer surface of the housing and the outlet hole, and put the assembly of the first potting tool and the stator into a high temperature box at 70° C. for preheating for a second predetermined time;

[0049] S5, preparing epoxy potting glue according to a predetermined ratio, stirring the glue liquid evenly after preparing the glue, and putting it into a vacuum box to evacuate;

[0050] S6, after the preheating of the assembly of the first potting tool and the stator and the vacuuming of the potting glue are synchronously completed, the epoxy potting glue is poured into the assembly of the first potting tool and the stator, and when the liquid level of the epoxy potting glue is consistent with the feedback device, the second potting tool is assembled to the end face of the casing;

[0051] S7, placing the assembly of the first potting tool, the second potting tool and the stator into a vacuum box to evacuate;

[0052] S8, taking out the assembly of the first potting tool, the second potting tool and the stator. If the liquid level of the epoxy potting glue is lower than the feedback device, add epoxy potting glue until it is flush with the feedback device and perform a secondary vacuum operation;

[0053] S9, after potting is completed, remove the second potting tool and clean the glue stains on the inner wall of the casing;

[0054] S10, placing the potted stator together with the first potting tool into a high temperature box at 80°C and heating for a third predetermined time, then raising the temperature to 120°C, heating for a third predetermined time, and then naturally cooling down in the box.

[0055] Wherein, step S4 and step S5 can be executed simultaneously.

[0056] Through the above technical solution, the motor stator and feedback device can be potted with potting glue at the same time, the potting cavity is well sealed, vacuum potting can be performed, and it is easy to demould, which greatly enhances the overall impact resistance of the motor and solves the problem that the motor stator and feedback device are easily damaged when subjected to high impact. In addition, the potting operation in this method is simple and effective, and easy to implement; the motor stator and feedback device after potting have strong impact resistance and are not easily damaged.

[0057] Among them, the structure when performing the above-mentioned encapsulation operation is as follows Figure 6 shown.

[0058] According to one embodiment of the present invention, the binder is Loctite 914 instant adhesive, and the inorganic thickener is silicone grease.

[0059] According to an embodiment of the present invention, the first predetermined time is 15 minutes, the second predetermined time is 30 minutes, the third predetermined time is 2 hours, and the predetermined ratio is 2:1.

[0060] According to one embodiment of the present invention, the vacuum box parameters in S5 are set to: temperature 60°C, pressure 100Pa, time 5 minutes, and the vacuum box parameters in S7 are set to: temperature 60°C, pressure 100Pa, time 10 minutes.

[0061] According to one embodiment of the present invention, the epoxy potting glue is poured into the assembly of the first potting tool and the stator at least twice, and a pause of 1-2 minutes is made after each pouring to allow the glue to fill the entire assembly of the first potting tool and the stator.

[0062] The encapsulation device and encapsulation method of the motor stator and feedback device according to the present invention are described below with reference to examples.

[0063] like Figure 1-Figure 5 As shown, the potting device of the present invention includes: (1) a feedback device pad, which is a hollow circular plate with three positioning cards at one end for positioning the feedback device; and a marking groove at the other end for aligning the stator core in the circumferential direction. (2) a stator pressing tool, which is cylindrical with a step surface at the middle section for applying pressure to the step surface of the inner circle of the stator. (3) a potting tool assembly, which is divided into a potting tool A and a potting tool B. The cylindrical surface with an outer diameter of 16.4 on the potting tool A is tightly matched with the inner circle of the non-outlet end of the casing, and the cylindrical surface with an outer diameter of 8.8 is tightly matched with the inner circle of the stator to prevent the potting glue from leaking out. The circular hole with an inner diameter of 18 on the potting tool B is tightly matched with the outer diameter of the outlet end of the casing to prevent the potting glue from overflowing. The potting tool A and the potting tool B cooperate with the potted parts to form a potting cavity, which contains the potted stator winding and feedback device.

[0064] The specific potting operation is as follows: Put the feedback device pad on the stator outlet winding, align its marking groove with the marking groove on the stator, and apply Loctite 914 instant glue on the contact surface. Gently press the feedback device pad to make its bottom surface fit with the stator end surface, and cure it at room temperature for 15 minutes. Apply a layer of Loctite 914 instant glue on the outer surface of the stator, align the root of the stator lead wire with the center line of the housing outlet hole, press the stator to the corresponding position of the housing using the stator pressing tool, and cure it at room temperature for 15 minutes. With the chip of the feedback device facing the stator, snap the three grooves on the feedback device circuit board onto the three positioning cards of the feedback device pad, apply Loctite 914 instant glue at the contact between the groove and the card, and cure it at room temperature for 15 minutes. Apply a layer of silicone grease evenly on the outer surface of the potting tool A. With the non-outlet end of the stator assembly facing downward, assemble it to the potting tool A, so that the housing end face of the stator non-outlet end fits the end face of the potting tool A. Apply a layer of silicone grease evenly on the outer surface of the housing and the outlet hole. Preheat the above assembly in a high temperature box at 70°C for 30 minutes. Prepare epoxy potting glue 9000A-TZ / B-TZ in a ratio of 2:1. After preparing the glue, stir the glue evenly and put it into a vacuum box for vacuuming. The vacuum box parameters are set as follows: temperature 60°C, pressure 100Pa, and time 5 minutes. After the stator assembly is preheated and the potting glue is vacuumed, pour the potting glue into the stator assembly. Affected by the gap and the fluidity of the glue, the glue should be poured into the stator assembly at least twice. After each pouring, pause for 1-2 minutes to allow the glue to fill the entire stator assembly. When the glue height is basically consistent with the uppermost end of the feedback device, assemble the potting tool B to the end face of the housing. Put the stator assembly equipped with potting tool A and potting tool B into a vacuum box for vacuuming. The vacuum box parameters are set as follows: temperature 60°C, pressure 100Pa, and time 10 minutes. Take out the stator assembly equipped with potting tooling A and potting tooling B and observe the potting glue level. If it is lower than the feedback device, add glue until it is flush with the feedback device and perform a secondary vacuum operation.

[0065] After potting is completed, remove the potting tool B and clean the glue stains on the inner wall of the casing.

[0066] The potted stator assembly together with the potting tool A is placed in a high temperature box at 80°C and heated for 2 hours, then the temperature is raised to 120°C and heated for another 2 hours, and then cooled naturally in the box.

[0067] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0068] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0069] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A potting device for a motor stator and a feedback device, characterized in that: The device includes: A feedback device pad, which is a hollow circular plate, with multiple positioning clamps at one end for positioning the feedback device, and a marking groove at the other end for aligning the motor stator core in the circumferential direction; The stator pressing tool is cylindrical, and a step surface is provided at the middle section of the cylinder, which is used to apply pressure to the step surface of the inner circle of the motor stator; A potting tool assembly includes a first potting tool and a second potting tool. The first cylinder on the first potting tool is tightly matched with the inner circle of the non-outlet end of the casing, and the second cylinder is tightly matched with the inner circle of the stator to prevent the potting glue from leaking out. The outer diameter of the first cylinder is larger than the outer diameter of the second cylinder. The circular hole on the second potting tool is tightly matched with the outer diameter of the outlet end of the casing to prevent the potting glue from overflowing. The first potting tool and the second potting tool cooperate with the potted parts to form a potting cavity, and the potting cavity contains the potted stator winding and the feedback device.

2. The device according to claim 1, characterized in that The number of positioning card stations is 3.

3. The device according to claim 2, characterized in that The outer diameter of the first cylinder is 16.4 mm, the outer diameter of the second cylinder is 8.8 mm, and the inner diameter of the circular hole is 18 mm.

4. A potting method using the potting device of the motor stator and feedback device according to any one of claims 1 to 3, characterized in that: The method includes: S1, putting the feedback device pad on the stator output terminal winding, aligning it with the motor stator core through the marking groove, applying adhesive on the contact surface, making the bottom surface of the feedback device pad fit with the stator end surface, and curing it at room temperature for a first predetermined time; S2, applying adhesive on the outer surface of the stator, aligning the root of the stator lead wire with the center line of the housing lead hole, pressing the stator to the corresponding position of the housing using a stator pressing tool, and curing it at room temperature for a first predetermined time; S3, with the chip of the feedback device facing the stator, the three grooves on the circuit board of the feedback device are correspondingly buckled onto the three positioning cards of the backing plate of the feedback device, and adhesive is applied to the contact points between the grooves and the positioning cards, and cured at room temperature for a first predetermined time; S4, evenly apply an inorganic thickener on the outer surface of the first potting tool, assemble the stator onto the first potting tool with the non-outlet end of the stator facing downward, so that the end face of the housing at the non-outlet end of the stator fits with the end face of the first potting tool, then evenly apply an inorganic thickener on the outer surface of the housing and the outlet hole, and put the assembly of the first potting tool and the stator into a high temperature box at 70° C. for preheating for a second predetermined time; S5, preparing epoxy potting glue according to a predetermined ratio, stirring the glue liquid evenly after preparing the glue, and putting it into a vacuum box to evacuate; S6, after the preheating of the assembly of the first potting tool and the stator and the vacuuming of the potting glue are synchronously completed, the epoxy potting glue is poured into the assembly of the first potting tool and the stator, and when the liquid level of the epoxy potting glue is consistent with the feedback device, the second potting tool is assembled to the end face of the casing; S7, placing the assembly of the first potting tool, the second potting tool and the stator into a vacuum box to evacuate; S8, taking out the assembly of the first potting tool, the second potting tool and the stator. If the liquid level of the epoxy potting glue is lower than the feedback device, add epoxy potting glue until it is flush with the feedback device and perform a secondary vacuum operation; S9, after potting is completed, remove the second potting tool and clean the glue stains on the inner wall of the casing; S10, placing the potted stator together with the first potting tool into a high temperature box at 80°C and heating for a third predetermined time, then raising the temperature to 120°C, heating for a third predetermined time, and then naturally cooling down in the box.

5. The method according to claim 4, characterized in that The binder is Loctite 914 instant adhesive and the inorganic thickener is silicone grease.

6. The method according to claim 5, characterized in that The first scheduled time is 15 minutes, the second scheduled time is 30 minutes, the third scheduled time is 2 hours, and the scheduled ratio is 2:

1.

7. The method according to claim 6, characterized in that The vacuum box parameters in S5 are set as follows: temperature 60°C, pressure 100Pa, time 5 minutes; the vacuum box parameters in S7 are set as follows: temperature 60°C, pressure 100Pa, time 10 minutes.

8. The method according to claim 6, characterized in that The epoxy potting glue is poured into the assembly of the first potting tool and the stator at least twice, and a pause of 1-2 minutes is made after each pouring to allow the glue to fill the entire assembly of the first potting tool and the stator.

Images