Shaft current blocking insulation structure for motor

Abstract

The utility model provides an insulation structure for blocking shaft current for a motor, which is characterized in that the insulation structure comprises an insulation film, the thickness of the insulation film is not less than 0.5 mm, two ends of the insulation film are connected to form a closed structure, an outer metal wrapping layer wraps the outer side of the insulation film, an inner metal wrapping layer wraps the inner side of the insulation film, and the outer metal wrapping layer wraps the inner metal wrapping layer. The outer side of the outer metal wrapping layer is matched with the inner side of the base in shape and size, and the inner side of the inner metal wrapping layer is matched with the outer side of the bearing seat in shape and size. The problems of poor insulation effect and unqualified ground insulation of the variable frequency motor shaft in the prior art are solved, the original structure and support effect are not changed, and the insulation function is added.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, specifically an insulating structure for blocking shaft current in motors. Background Technology

[0002] Due to the power supply conditions during operation, variable frequency motors inevitably generate shaft voltage inside the motor. Once an electrical circuit is formed, it will damage the bearings and affect the normal operation of the motor. Therefore, it is necessary to add an insulation layer to block this electrical circuit. The original insulation measures include using insulated bearings; or covering the end cover and bearing sleeve with non-woven tape material and insulating the area around the fasteners; or using an integral insulation structure. However, the original insulated bearings are too expensive, the non-woven tape structure is too cumbersome to operate and has low reliability; integral insulation requires complex mold pressing, lacks flexibility, and cannot be adapted to multiple models. Utility Model Content

[0003] This invention provides an insulating structure for blocking shaft current in motors, thereby addressing the technical deficiencies of the prior art.

[0004] To solve the above-mentioned technical problems, the present invention provides an insulating structure for blocking shaft current in a motor, characterized by comprising an insulating film with a thickness of not less than 0.5 mm, the two ends of the insulating film being connected to form a closed structure, an outer metal wrapping layer covering the outer side of the insulating film, and an inner metal wrapping layer covering the inner side of the insulating film. The outer side of the outer metal wrapping layer is shaped and sized to match the inner side of the motor base, and the inner side of the inner metal wrapping layer is shaped and sized to match the outer side of the bearing seat.

[0005] Specifically, the insulation structure is used in conjunction with the variable frequency motor.

[0006] Specifically, the outer metal coating layer and the inner metal coating layer are generally annular.

[0007] Specifically, during the assembly of the insulating structure, when the insulating film is wrapped around the outer side of the inner metal wrapping layer, the outer metal wrapping layer needs to be heated before the inner side of the outer metal wrapping layer is heat-fitted onto the insulating film.

[0008] Specifically, after the outer metal cladding layer and the inner metal cladding layer encapsulate the insulating film, an epoxy adhesive is used to seal the joint, and all indicators must meet the requirements of the national standard GB / T 4612.

[0009] Specifically, the epoxy adhesive is a thermally conductive and insulating epoxy adhesive.

[0010] Specifically, the outer metal cladding layer and the inner metal cladding layer are made of cast iron.

[0011] Specifically, the insulating film is made of polyimide.

[0012] Due to its insulating film and other structures, the beneficial effects of this invention are:

[0013] 1. It solves the problems of poor insulation and substandard insulation between the variable frequency motor shaft and ground without changing the original structure and support function, and adds insulation function without increasing weight or adding particularly complicated processes, thus improving the reliability of the product.

[0014] 1. This insulation structure can be directly fabricated on the metal body without requiring special processing equipment or techniques, allowing for flexible adaptation to various needs. Material and processing costs are also lower. No further machining is required after assembly. This improves motor reliability, reduces manufacturing costs, and results in a simpler, more rational, and easier-to-implement structure, avoiding quality issues.

[0015] 2. The entire structure is modular, allowing for adjustments to the manufacturing dimensions of individual components to meet the specific installation requirements of different models. Each component can be mass-produced, assembled elsewhere into its final form, and then sent to the generator assembly station, making it suitable for orders of various types of variable frequency motors in small batches. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.

[0017] Figure 1 This is a two-dimensional schematic diagram of the upper half of an insulation structure for blocking shaft current in an electric motor according to the present invention.

[0018] Figure 2 This is a schematic diagram showing the position of the upper part of the insulating structure for blocking shaft current in a motor, relative to the motor base and bearing housing.

[0019] Figure 3 This is a three-dimensional schematic diagram of the upper half of an insulation structure for blocking shaft current in an electric motor according to the present invention.

[0020] Among them, 1. outer metal cladding layer, 2. inner metal cladding layer, 3. epoxy adhesive, 4. insulating film, 5. base, and 6. bearing housing. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by a person of ordinary skill in the art to which this application pertains.

[0023] like Figures 1 to 3 As shown, this utility model provides an insulating structure for blocking shaft current in a motor. It features an insulating film 4 with a thickness of at least 0.5 mm. The two ends of the insulating film 4 are connected to form a closed structure. An outer metal layer 1 is wrapped around the outside of the insulating film 4, and an inner metal layer 2 is wrapped around the inside. The outer side of the outer metal layer 1 matches the inner side of the base 5 in shape and size, and the inner side of the inner metal layer 2 matches the outer side of the bearing seat 6 in shape and size. The insulating film 4 is crucial to this utility model, not only blocking the electrical circuit but also ensuring insulation effectiveness and necessary mechanical strength, with a thickness of at least 0.5 mm after wrapping. The outer metal layer 1 provides protection for the insulating film 4 and connects to the base 5 to form a stable structure. The inner metal layer 2 also provides protection for the insulating film 4 and connects to the bearing seat 6 to form a stable structure. Finally, this utility model connects between the base 5 and the bearing seat 6, improving the overall stability of the equipment while blocking the electrical circuit, preventing damage to the bearing, and avoiding interference with the normal operation of the motor.

[0024] Specifically, the insulation structure is designed to work with the variable frequency motor. Insulation measures are essential for the variable frequency motor, while they would increase the cost of a regular motor.

[0025] Specifically, the outer metal cladding layer 1 and the inner metal cladding layer 2 are generally annular, and the annular shape is compatible with most machine bases 5 and bearing seats 6, thus improving versatility.

[0026] Specifically, during the assembly of the insulating structure, when the insulating film 4 is wrapped around the outer side of the inner metal wrapping layer 2, the outer metal wrapping layer 1 needs to be heated before the inner side of the outer metal wrapping layer 1 is heat-fitted onto the insulating film 4, which improves the reliability of the installation.

[0027] Specifically, after the outer metal sheath 1 and the inner metal sheath 2 encapsulate the insulating film, an epoxy adhesive 3 is used to seal the joint. All indicators must meet the requirements of the national standard GB / T 4612. The outer metal sheath 1 and the inner metal sheath 2 combine to form a closed ring, and are both sealed with epoxy adhesive 3, thus improving the safety of the insulating film.

[0028] Specifically, the epoxy adhesive 3 is a thermally conductive and insulating epoxy adhesive, which further improves the insulation performance and at the same time transfers heat, thus playing a heat dissipation function.

[0029] Specifically, the outer metal cladding layer 1 and the inner metal cladding layer 2 are made of cast iron. Cast iron has high compressive strength, excellent vibration damping performance, low cost, mature casting process, is suitable for mass production, wear-resistant and corrosion-resistant, and its surface can be sprayed to extend its service life.

[0030] Specifically, the insulating film 4 is made of polyimide. Polyimide is resistant to high temperature, suitable for high-speed / high-power motors, has high insulation strength to effectively block shaft current, high mechanical strength, tensile strength, and wear resistance, and is suitable for bearing seats and machine base mounting under high pressure.

[0031] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any changes or modifications to the above embodiments within the scope of the essential spirit of the present utility model will fall within the scope of the claims of the present utility model.

Claims

1. An insulating structure for blocking shaft current in an electric motor, characterized in that... It includes an insulating film (4) with a thickness of not less than 0.5 mm. The two ends of the insulating film (4) are connected to form a closed structure. The outer side of the insulating film (4) is wrapped with an outer metal wrapping layer (1), and the inner side of the insulating film (4) is wrapped with an inner metal wrapping layer (2). The outer side of the outer metal wrapping layer (1) is shaped and sized to match the inner side of the base (5), and the inner side of the inner metal wrapping layer (2) is shaped and sized to match the outer side of the bearing seat (6).

2. The insulation structure for blocking shaft current in a motor according to claim 1, characterized in that... The insulation structure is designed to work with the variable frequency motor.

3. An insulation structure for blocking shaft current in a motor according to claim 1, characterized in that... The outer metal wrapping layer (1) and the inner metal wrapping layer (2) are generally annular.

4. An insulation structure for blocking shaft current in a motor according to claim 1, characterized in that... When the insulating structure is assembled, the insulating film (4) is wrapped around the outside of the inner metal wrapping layer (2). After the outer metal wrapping layer (1) needs to be heated, the inner side of the outer metal wrapping layer (1) is heat-fitted onto the insulating film.

5. An insulation structure for blocking shaft current in a motor according to claim 1, characterized in that... After the outer metal cladding layer (1) and the inner metal cladding layer (2) wrap the insulating film (4), an epoxy adhesive (3) is sealed at the joint. All indicators must meet the requirements of the national standard GB / T 4612.

6. An insulation structure for blocking shaft current in a motor according to claim 5, characterized in that... The epoxy adhesive (3) is a thermally conductive and insulating epoxy adhesive.

7. An insulation structure for blocking shaft current in a motor according to claim 1, characterized in that... The outer metal cladding layer (1) and the inner metal cladding layer (2) are made of cast iron.

8. The insulation structure for blocking shaft current in an electric motor according to any one of claims 1 to 7, characterized in that... The insulating film (4) is made of polyimide.

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