Motor end cover assembly, brush motor and electrical equipment
By covering the inner wall of the motor end cover with an insulating layer, the problem of leakage grounding or short circuit caused by conductive powder in brushed motors is solved, thus achieving stable operation of the motor system and avoiding electrical equipment failure.
Patent Information
- Application Number
- CN202423087517.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-13
AI Technical Summary
During operation, brushed motors generate conductive powder due to the contact friction between the brushes and the commutator. This powder can cause the motor end cover to become conductive with the brush assembly, leading to leakage grounding or short circuit, which in turn causes brushed motor and motor system failure.
An insulating layer is applied to the side wall of the inner cavity of the motor end cover to prevent conductive powder from adhering to the motor end cover. The insulating layer adsorbs the conductive powder, preventing the motor end cover from conducting with the brush assembly.
It effectively avoids grounding or short circuits in brushed motors, prevents brushed motor and motor system failures, and reduces electrical equipment failures caused by minute currents.
Smart Images
Figure CN223829142U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor technology, and in particular to a motor end cover assembly, a brushed motor, and electrical equipment. Background Technology
[0002] Brushed motors are devices that convert or transmit electrical energy based on the law of electromagnetic induction. As an important power device, brushed motors are widely used in home appliances, manufacturing, automotive industry, aerospace, medical devices, robotics, chip manufacturing and other fields.
[0003] When a brushed motor is working, the brushes located inside the motor end cover come into contact with and rub against the commutator so that the current is guided through the commutator into the rotor coil and the direction of the coil current is changed by the commutator.
[0004] However, the contact friction between the brushes and the commutator generates conductive powder. As the conductive powder accumulates, it can cause the brushed motor to leak to ground or short-circuit, thus causing failure of the brushed motor and motor system. Utility Model Content
[0005] This utility model provides a motor end cover assembly, a brushed motor, and electrical equipment to prevent brushed motor leakage to ground or short circuit, thereby solving the technical problem of brushed motor and motor system failure.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] On the one hand, this utility model provides a motor end cover assembly, including:
[0008] A motor end cover, the motor end cover having an inner cavity;
[0009] A brush assembly, the brush assembly including a brush that is in frictional contact with a commutator located in the inner cavity;
[0010] An insulating layer that covers the sidewalls of the inner cavity.
[0011] Based on the above technical solution, the present invention can be further improved as follows:
[0012] In one possible implementation, the insulating layer comprises an insulating varnish applied to the sidewall of the inner cavity.
[0013] In one possible implementation, the insulating varnish is uniformly coated on the sidewalls of the inner cavity.
[0014] In one possible implementation, the insulating layer comprises an insulating film attached to the sidewall of the inner cavity.
[0015] In one possible implementation, the insulating film is a high-temperature resistant insulating film.
[0016] In one possible implementation, the thickness of the insulating layer is greater than or equal to 0.1 mm.
[0017] In one possible implementation, the brush assembly further includes a brush holder connected to the brush;
[0018] The inner cavity has at least one pair of windows on its side wall, through which the brush holder is exposed.
[0019] In one possible implementation, the brush holder has an insulating portion located between the brush and the motor end cover to insulate the brush from the motor end cover.
[0020] On the other hand, this utility model provides a brushed motor, including a motor body and a motor end cover assembly as described in any of the above, wherein the motor end cover assembly is connected to the end of the motor body;
[0021] The motor body includes a rotor assembly, the rotor assembly includes a commutator and a shaft, the commutator is mounted on the shaft, and the brushes in the motor end cover assembly are in frictional contact with the commutator.
[0022] On the other hand, this utility model provides an electrical device including the brushed motor.
[0023] The motor end cover assembly, brushed motor, and electrical equipment provided by this utility model have the following beneficial effects:
[0024] The frictional contact between the brushes and the commutator allows current to flow through the brushes and into the rotor via the commutator, with the commutator adjusting the current direction. An insulating layer covers the sidewalls of the inner cavity, causing conductive powder generated by the friction between the brushes and the commutator to adhere to the insulating layer, preventing the conductive powder from connecting to the motor end cover. Compared to related technologies, in the end cover assembly, brushed motor, and electrical equipment provided by this invention, the conductive powder adheres to the insulating layer covering the motor end cover, rather than to the motor end cover itself. This prevents the motor end cover from conducting to the brush assembly, thus avoiding grounding leakage or short circuits in the brushed motor, and consequently preventing malfunctions of the brushed motor and motor system.
[0025] In addition, by avoiding the conduction between the motor end cover and the brush assembly inside the brushed motor, a small current is avoided from forming inside the brushed motor, thereby preventing faults and fault signals caused by small currents in electrical equipment. Attached Figure Description
[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of the motor end cover assembly provided in an embodiment of the present utility model.
[0028] Explanation of reference numerals in the attached figures:
[0029] 10-Motor end cover;
[0030] 11-Inner cavity; 111-Window;
[0031] 20 - Commutator;
[0032] 30 - Brush assembly;
[0033] 31-Brush; 32-Brush holder; 321-Insulation part;
[0034] 40 - Insulation layer;
[0035] 50-spindle. Detailed Implementation
[0036] The contact friction between the brushes and commutator generates conductive powder. As this powder accumulates, it can cause leakage to ground or short circuits in the brushed motor, leading to malfunctions in the brushed motor and the entire motor system. This problem arises because, in related technologies, conductive powder easily adheres to the motor end cover and brush assembly. As the powder accumulates, it creates a conductive connection between the end cover and the brush assembly, causing leakage through the end cover or an internal short circuit within the motor. This generates a fault signal, affecting components such as the power supply and driver in the motor system, ultimately resulting in a malfunction.
[0037] To address the aforementioned technical problems, this utility model provides a motor end cover assembly, a brushed motor, and electrical equipment. By covering the sidewall of the inner cavity of the motor end cover with an insulating layer, conductive powder is used to prevent the motor end cover and brush assembly from conducting through, thereby preventing leakage or short circuits in the brushed motor and thus preventing malfunctions in the brushed motor and the motor system. Furthermore, by preventing conduction between the motor end cover and the brush assembly within the brushed motor, minute currents are prevented from forming within the brushed motor, thus preventing malfunctions and fault signals in the electrical equipment caused by minute currents.
[0038] To make the above-mentioned objectives, features, and advantages of the embodiments of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0039] refer to Figure 1 This utility model embodiment provides a motor end cover assembly, which includes a motor end cover 10, an inner cavity 11 within the motor end cover 10, and a commutator 20 located in the inner cavity 11. The motor end cover assembly also includes at least one pair of brush assemblies 30 and an insulating layer 40.
[0040] The motor end cover 10 is the main structure of the motor end cover assembly. The motor end cover 10 can be made of metals such as aluminum, iron, or stainless steel. The motor end cover 10 is used to seal one end of the brushed motor to protect its internal structure and prevent external impurities from entering. (Reference) Figure 1 The motor end cover 10 has an inner cavity 11, which is a hollow structure inside the motor end cover 10. For example, with Figure 1 As shown in the example, the motor end cover 10 is in the shape of a ring. In addition, the motor end cover 10 can also be in the shape of an approximate ring, a rectangular ring, or an approximate rectangular ring.
[0041] The inner cavity 11 contains a commutator 20, which is used to switch the direction of current in the brushed motor, for example, referring to... Figure 1 The commutator 20 is installed on the rotor shaft 50 of the brushed motor.
[0042] The brush assembly 30 includes brushes 31, which are used to guide current into the brushed motor via the commutator 20. Brushes 31 can be metal graphite carbon brushes, pitch graphite carbon brushes, resin graphite carbon brushes, or electrographite carbon brushes. Metal graphite carbon brushes are made by combining graphite with fine metal powders such as copper, silver, tin, and lead, and have low resistivity and high conductivity. Pitch graphite carbon brushes are made by mixing pitch and graphite, and have good sliding performance and wear resistance. Resin graphite carbon brushes are made by mixing resin and graphite, and have good damping and lubrication characteristics. Electrographite carbon brushes are made by combining carbon, graphite, and flexible conductive materials, and have good electrical conductivity, thermal conductivity, and lubrication performance.
[0043] refer to Figure 1The brush 31 makes frictional contact with the commutator 20, allowing current to flow through the brush 31 and into the brushed motor via the commutator 20. The friction between the brush 31 and the commutator 20 generates conductive powder, which can be carbon powder or fine metal powders such as copper, silver, tin, or lead. This conductive powder easily adheres to the inner wall of the motor end cover 10 cavity 11 and the brush assembly 30. As the conductive powder accumulates, it forms a conductive path between the motor end cover 10 and the brush assembly 30, causing leakage or short circuits in the motor end cover 10, ultimately leading to malfunctions in the brushed motor and the motor system.
[0044] Insulating layer 40 has insulating properties, see reference. Figure 1 An insulating layer 40 covers the sidewall of the inner cavity 11, and the insulating layer 40 is present at any position on the sidewall of the inner cavity 11. This allows the conductive powder to adhere to the insulating layer 40, rather than to the sidewall of the inner cavity 11 of the motor end cover 10. This prevents the motor end cover 10 and the brush assembly 30 from conducting, preventing leakage or short circuit in the brushed motor, and thus preventing malfunctions of the brushed motor and the motor system.
[0045] The motor end cover assembly provided in this embodiment of the utility model covers the side wall of the inner cavity 11 of the motor end cover 10 with an insulating layer 40, so that the conductive powder adheres to the insulating layer 40 instead of adhering to the side wall of the inner cavity 11 of the motor end cover 10. This prevents the motor end cover 10 and the brush assembly 30 from being connected through the conductive powder, thereby preventing leakage or short circuit in the brushed motor, and thus preventing malfunctions of the brushed motor and the motor system.
[0046] In some embodiments, the insulating layer 40 comprises an insulating varnish, which is an insulating paint, and is applied to the sidewall of the inner cavity 11. Forming the insulating layer 40 with an insulating varnish is convenient and facilitates the formation of an insulating layer on the sidewall of the inner cavity 11. The insulating varnish also prevents corrosion of the sidewall of the inner cavity 11.
[0047] Based on the above embodiment, the insulating varnish is uniformly coated on the sidewall of the inner cavity 11. Uniform coating means that the insulating varnish has a uniform thickness on the sidewall of the inner cavity 11; for example, the difference between the maximum and minimum thickness on the sidewall of the inner cavity 11 is between 0.1 and 0.2 mm, such as 0.1 mm, 0.15 mm, or 0.2 mm.
[0048] In one possible implementation, the thickness of the insulating varnish is greater than or equal to 0.1 mm, such as 0.1 mm, 0.2 mm, or others. It should be noted that the thickness of the insulating varnish at any location on the sidewall of the inner cavity 11 is greater than or equal to 0.1 mm. This configuration ensures that the brushed motor, after being tested with 500V AC for 1 second, has a leakage current of less than 2.5 mA, meeting industrial requirements.
[0049] In other embodiments, the insulating layer 40 includes an insulating film attached to the sidewall of the inner cavity 11. The insulating film may be made of materials including, but not limited to, polyethylene, polyvinyl chloride, and polypropylene. Insulating films are readily available and suitable for temporarily resolving problems caused by conductive powder leading to grounding or short circuits in the brushed motor, thus causing malfunctions in the brushed motor and motor system. For example, a plastic bag can be wrapped around and covered on the sidewall of the inner cavity 11.
[0050] In one possible implementation, the insulating film is a high-temperature resistant insulating film. A high-temperature resistant insulating film is a plastic film that maintains stable physical and chemical properties at the product's operating temperature while possessing good insulating properties. High-temperature resistant insulating films include, but are not limited to, polyethylene terephthalate films, polyimide films, or polytetrafluoroethylene films. This configuration prevents high-temperature damage to the insulating film during brushed motor operation, thus ensuring the film's insulation properties.
[0051] It should be noted that the thickness of the insulating film is greater than or equal to 0.1 mm, for example, 0.1 mm, 0.2 mm, or other thicknesses. It should also be noted that the thickness of the insulating varnish at any location on the sidewall of the inner cavity 11 is greater than or equal to 0.1 mm. This configuration ensures that the brushed motor, after being tested with 500V AC for 1 second, exhibits a leakage current of less than 2.5 mA, meeting industrial requirements.
[0052] In some embodiments, reference Figure 1 The brush assembly 30 also includes a brush holder 32 for positioning the brush 31 so that the brush 31 has an accurate position on the commutator 20. The brush holder 32 is connected to the brush 31, and the brush 31 is mounted on the brush holder 32. For example, the brush holder 32 has a mounting groove 321, and the brush 31 is mounted in the mounting groove 321.
[0053] A window 111 is provided on the side wall of the inner cavity 11, and the window 111 connects to the inside of the motor end cover 10. The brush holder 32 is inserted through the window 111 so that the brush holder 32 can introduce current into the brushed motor through the brush 31 and the commutator 20. The brush holder 32 positions the brush 31, which can ensure stable current transmission.
[0054] Based on the above embodiment, the brush holder 32 has an insulating portion 321, which is insulating and can be made of plastic. The insulating portion 321 is located between the brush 31 and the motor end cover 10 to insulate the brush 31 from the motor end cover 10. (Reference) Figure 1 The insulating part 321 can be an insulating cap, which is located inside the window 111. The brush 31 is located inside the insulating cap, so that the brush 31 is insulated from the motor end cover 10, further improving the insulation between the brush 31 and the motor end cover 10.
[0055] This utility model embodiment also provides a brushed motor, which includes a motor body and a motor end cover assembly as described above. The specific structure of the motor end cover assembly is shown in the above embodiments. The motor end cover assembly is located at one end of the motor body, and the motor body includes a rotor assembly, such as... Figure 1 As shown, the rotor assembly includes a commutator 20 and a shaft 50. The commutator 20 is mounted on the shaft 50, and the brushes 31 in the motor end cover assembly are in frictional contact with the commutator 20. In one possible implementation, the motor body also includes a stator and a flange. The stator is sleeved on the rotor, one end of the shaft 50 is mounted on a first bearing inside the motor end cover assembly, and the other end of the shaft 50 is mounted on a second bearing inside the flange. Since this motor adopts all the technical solutions of any of the above embodiments, it has at least all the beneficial effects brought by any of the above embodiments, which will not be elaborated here.
[0056] This utility model embodiment also provides an electrical device, which may include, but is not limited to, any one of the following: a blower, an air conditioner, a washing machine, a sweeper, a range hood, and a robot. The robot may include, but is not limited to, any one of the following: a chip manufacturing robot, a medical emergency robot, an automated equipment robot, and a health and wellness robot.
[0057] The electrical equipment includes the brushed motor described in the above embodiments. The specific structure of the brushed motor is described in the above embodiments. Since this motor employs all the technical solutions of any of the above embodiments, it possesses at least all the beneficial effects brought about by any of the above embodiments, which will not be elaborated upon here.
[0058] Furthermore, by preventing the motor end cover and brush assembly from conducting within the brushed motor, a small current is avoided within the brushed motor, thereby preventing faults and fault signals caused by small currents in electrical equipment.
[0059] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
[0060] It should be noted that phrases such as "in particular implementation," "in some embodiments," "in this embodiment," and "exemplarily" used in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Additionally, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.
[0061] Generally, terms should be understood at least in part by their use in context. For example, the term "one or more" as used in the text can be used, at least in part, to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning, depending on the context. Similarly, terms such as "a" or "the" can also be understood, at least in part, to convey either singular or plural usage, depending on the context.
[0062] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).
[0063] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.
[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A motor end cover assembly, characterized in that, include: Motor end cover (10), the motor end cover (10) having an inner cavity (11); A brush assembly (30) includes a brush (31) that is in frictional contact with a commutator (20) located in the inner cavity (11); An insulating layer (40) covers the sidewall of the inner cavity (11); The thickness of the insulating layer (40) is greater than or equal to 0.1 mm; The brush holder (32) has an insulating part (321) located between the brush (31) and the motor end cover (10) to insulate the brush (31) from the motor end cover (10).
2. The motor end cover assembly according to claim 1, characterized in that, The insulating layer (40) includes an insulating varnish, which is applied to the sidewall of the inner cavity (11).
3. The motor end cover assembly according to claim 2, characterized in that, The insulating varnish is uniformly coated on the side wall of the inner cavity (11).
4. The motor end cover assembly according to claim 1, characterized in that, The insulating layer (40) includes an insulating film that is attached to the sidewall of the inner cavity (11).
5. The motor end cover assembly according to claim 4, characterized in that, The insulating film is a high-temperature resistant insulating film.
6. The motor end cover assembly according to any one of claims 1-5, characterized in that, The brush assembly (30) further includes a brush holder (32) connected to the brush (31); The inner cavity (11) has a window (111) on its side wall, and the brush holder (32) passes through the window (111).
7. A brushed motor, characterized in that, It includes a motor body and a motor end cap assembly as described in any one of claims 1-6, wherein the motor end cap assembly is connected to the end of the motor body; The motor body includes a rotor assembly, which includes a commutator (20) and a shaft (50). The commutator (20) is mounted on the shaft (50), and the brushes (31) in the motor end cover assembly are in frictional contact with the commutator (20).
8. An electrical device, characterized in that, Including the brushed motor as described in claim 7.