Injection molding structure of rotor iron shell of variable frequency motor

Abstract

The utility model discloses a variable frequency motor rotor iron casing injection molding structure, which comprises an iron casing and a plastic lining, the center of the iron casing is fixedly connected with a vertically distributed central shaft, the plastic lining is arranged in the iron casing and is fixedly connected with the inner wall of the iron casing, and the inner wall of the plastic lining is provided with a plurality of annularly distributed embedding grooves. The outer wall of the plastic lining is provided with a protruding fixing point, the side wall of the iron shell is provided with a concave limiting clamp, the limiting clamp is located at the edge of the embedding groove, the outer side wall of the iron shell is further provided with a limiting hole, and the fixing point is embedded in the limiting hole and fixedly connected with the iron shell. According to the utility model, the plastic lining which is integrally formed through injection molding is arranged in the iron shell, so that the permanent magnet can be conveniently fixed, the convenience of rotor production and assembly is improved, the stability of the permanent magnet can be effectively improved, and the limiting holes are formed in the side wall of the iron shell and are matched with the convex fixing points on the outer side wall of the plastic lining, so that the stability of the permanent magnet is improved. The structural strength between the plastic lining and the iron shell is improved, and the plastic lining is prevented from falling off.

Description

Technical Field

[0001] The utility model relates to the technical field of variable-frequency motors, in particular to an injection molding structure of a rotor iron shell of a variable-frequency motor. Background Technique

[0002] A variable-frequency motor is a general term for motors driven by inverters. With the rapid development of variable-frequency speed regulation technology, various high-voltage inverters have emerged continuously, playing a huge energy-saving role in aspects such as the auxiliary power supply of power plants. A variable-frequency motor refers to a motor that can continuously operate at 100% rated load within the range of 10% - 100% rated speed under standard environmental conditions, and the temperature rise will not exceed the rated allowable value of the motor.

[0003] Currently, the permanent magnets in the rotors of variable-frequency motors in the market are usually directly fixed on the inner wall of the iron shell. During the installation process, it is not convenient to position the permanent magnets, which is likely to affect the dynamic balance of the rotor. Moreover, there is a lack of effective insulation measures between the rotor iron shell and the stator coil, affecting the safety of the variable-frequency motor during operation. For this reason, an injection molding structure of a rotor iron shell of a variable-frequency motor is proposed. Content of the Utility Model

[0004] (1) Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the utility model provides an injection molding structure of a rotor iron shell of a variable-frequency motor, which solves the problems of the existing injection molding structure of a rotor iron shell of a variable-frequency motor: directly fixing permanent magnets inside the iron shell affects installation, positioning, and has insufficient insulation performance. The utility model is provided with an integrally injection-molded plastic lining inside the iron shell, which is convenient for fixing the permanent magnets, improves the convenience of rotor production and assembly, and can effectively improve the stability of the permanent magnets. By providing a concave limiting card on the side wall of the iron shell and cooperating with the fixing points on the outer side wall of the plastic lining, the structural strength between the plastic lining and the iron shell is improved, preventing the plastic lining from falling off. At the same time, the injection-molded lining can insulate the iron shell and the electronic coil.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the utility model is realized through the following technical solutions: an injection molding structure of a rotor iron shell of a variable-frequency motor, including an iron shell and a plastic lining. A vertically distributed central shaft is fixedly connected to the center of the iron shell. The plastic lining is located inside the iron shell and fixedly connected to the inner wall of the iron shell. A plurality of annularly distributed embedding grooves are provided on the inner wall of the plastic lining. A raised fixing point is provided on the outer wall of the plastic lining. A concave limiting card is provided on the side wall of the iron shell, and the limiting card is located at the edge of the embedding groove. A limiting hole is further provided on the outer side wall of the iron shell, and the fixing point is embedded in the limiting hole and fixedly connected to the iron shell.

[0008] As a further preferred embodiment of the present utility model, a plurality of annularly distributed stamping grooves are provided on the end face of the iron shell, and the stamping grooves are radially distributed along the central axis.

[0009] As a further preferred embodiment of the present utility model, arc-shaped heat dissipation holes are also provided on the end face of the iron shell, and a boss is provided at the connection between the iron shell and the central axis.

[0010] As a further preferred embodiment of the present utility model, the plastic inner lining and the iron shell are integrally injection molded, and a raised washer is provided at the center of the plastic inner lining.

[0011] As a further preferred embodiment of the present utility model, the washer is located on the inner surface of the boss, and the washer is made of polytetrafluoroethylene material.

[0012] (III) Beneficial effects

[0013] The present utility model provides an injection molding structure for the iron shell of a variable-frequency motor rotor. The following beneficial effects are achieved:

[0014] By providing an integrally injection molded plastic inner lining inside the iron shell, the present utility model facilitates the fixation of permanent magnets, improves the convenience of rotor production and assembly, and can effectively improve the stability of permanent magnets. By providing limiting holes on the side wall of the iron shell and cooperating with the raised fixing points on the outer side wall of the plastic inner lining, the structural strength between the plastic inner lining and the iron shell is improved, preventing the plastic inner lining from falling off. At the same time, the injection molded inner lining can insulate the iron shell and the electronic coil. Description of the drawings

[0015] Figure 1 It is a schematic structural diagram of the overall injection molding structure of the iron shell of the variable-frequency motor rotor of the present utility model;

[0016] Figure 2 It is a schematic structural diagram of the cross-section of the injection molding structure of the iron shell of the variable-frequency motor rotor of the present utility model;

[0017] Figure 3 It is a schematic structural diagram of the end face of the injection molding structure of the iron shell of the variable-frequency motor rotor of the present utility model.

[0018] In the figure: iron shell - 1, plastic inner lining - 2, central axis - 3, embedding groove - 4, fixing point - 5, limiting card - 6, limiting hole - 7, stamping groove - 8, heat dissipation hole - 9, boss - 10, washer - 11. Detailed implementation manners

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1-3 , the embodiments of the present utility model provide a technical solution: a variable-frequency motor rotor iron shell injection molding structure, including an iron shell 1 and a plastic inner lining 2. A vertically distributed central shaft 3 is fixedly connected to the center of the iron shell 1. The plastic inner lining 2 is located inside the iron shell 1 and fixedly connected to the inner wall of the iron shell 1. A number of annularly distributed embedding grooves 4 are provided on the inner wall of the plastic inner lining 2. A protruding fixing point 5 is provided on the outer wall of the plastic inner lining 2. An inwardly concave limit card 6 is provided on the side wall of the iron shell 1. The limit card 6 is located at the edge of the embedding groove 4. A limit hole 7 is also opened on the outer side wall of the iron shell 1. The fixing point 5 is embedded in the limit hole 7 and fixedly connected to the iron shell 1.

[0021] Further improved, a number of annularly distributed stamping grooves 8 are provided on the end face of the iron shell 1. The stamping grooves 8 are radially distributed along the central shaft 3. By providing the annularly distributed and radially distributed stamping grooves 8 on the end face of the iron shell 1, the structural strength of the end face of the iron shell 1 is improved, preventing the iron shell 1 from deforming under the action of torque and improving the smoothness of the rotor rotation.

[0022] Further improved, an arc-shaped distributed heat dissipation hole 9 is also opened on the end face of the iron shell 1. A boss 10 is provided at the connection between the iron shell 1 and the central shaft 3. By providing the heat dissipation hole 9 on the end face of the iron shell 1, it is convenient for heat dissipation during the operation of the variable-frequency motor. By providing the boss 10 at the connection between the iron shell 1 and the central shaft 3, the connection strength between the central shaft 3 and the iron shell 1 is improved.

[0023] Further improved, the plastic inner lining 2 and the iron shell 1 are integrally injection molded. A protruding washer 11 is provided at the center of the plastic inner lining 2. By integrally injection molding the plastic inner lining 2 and the iron shell 1, the connection stability between the plastic inner lining 2 and the iron shell 1 is improved, while reducing the difficulty of the assembly process and improving the production and processing efficiency.

[0024] Further improved, the washer 11 is located on the inner surface of the boss 10. The washer 11 is made of polytetrafluoroethylene material. By providing the washer 11 made of polytetrafluoroethylene material on the surface of the boss 10, on the one hand, it can isolate the rotor and the stator, playing an insulating role, and at the same time reducing the friction between the rotor and the stator.

[0025] During the production of this utility model, the iron shell 1 is placed into an injection mold, and the plastic inner lining 2 is processed using an injection molding machine. After injection molding, the permanent magnets are embedded into the embedding grooves 4 on the side wall of the plastic inner lining 2 in a certain order and magnetic poles. At the same time, the limit card 6 on the side wall of the iron shell 1 contacts the side wall of the permanent magnet simultaneously, improving the structural stability during the rotation of the rotor. On the one hand, the plastic inner lining 2 facilitates the installation and fixation of the permanent magnets, and at the same time can provide insulation protection between the iron shell 1 and the stator coil, improving the safety of the variable-frequency motor during use.

[0026] The problem solved by this utility model is that in the market, the permanent magnets of the rotors of variable-frequency motors are usually directly fixed on the inner wall of the iron shell. During the installation process, it is inconvenient to position the permanent magnets, which is likely to affect the dynamic balance of the rotor. Moreover, there is a lack of effective insulation measures between the iron shell of the rotor and the stator coil, affecting the safety of the variable-frequency motor during operation. This utility model is provided with an integrally injection-molded plastic inner lining 2 inside the iron shell 1, which facilitates the fixation of the permanent magnets, improves the convenience of rotor production and assembly, and can effectively improve the stability of the permanent magnets. By opening a limit hole 7 on the side wall of the iron shell 1 and cooperating with the fixing point 5 protruding from the outer side wall of the plastic inner lining 2, the structural strength between the plastic inner lining 2 and the iron shell 1 is improved, preventing the plastic inner lining 2 from falling off. At the same time, the injection-molded inner lining 2 can insulate the iron shell 1 and the electronic coil.

[0027] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front part", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this utility model.

[0028] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0029] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A variable-frequency motor rotor iron shell injection molding structure, comprising an iron shell (1) and a plastic inner lining (2), characterized in that: A central axis (3) vertically distributed is fixedly connected to the center of the iron shell (1). The plastic inner lining (2) is located inside the iron shell (1) and fixedly connected to the inner wall of the iron shell (1). A number of annularly distributed embedding grooves (4) are provided on the inner wall of the plastic inner lining (2). A raised fixing point (5) is provided on the outer wall of the plastic inner lining (2). A concave limiting card (6) is provided on the side wall of the iron shell (1). The limiting card (6) is located at the edge of the embedding groove (4). A limiting hole (7) is also formed on the outer side wall of the iron shell (1). The fixing point (5) is embedded in the limiting hole (7) and fixedly connected to the iron shell (1).

2. The injection molding structure of the rotor iron shell of a variable-frequency motor according to claim 1, characterized in that: A number of annularly distributed stamping grooves (8) are provided on the end face of the iron shell (1). The stamping grooves (8) are radially distributed along the central axis (3).

3. A variable-frequency motor rotor iron shell injection molding structure according to claim 1, characterized in that: An arc-shaped distributed heat dissipation hole (9) is also formed on the end face of the iron shell (1). A boss (10) is provided at the connection between the iron shell (1) and the central axis (3).

4. A variable-frequency motor rotor iron shell injection molding structure according to claim 3, characterized in that: The plastic inner lining (2) and the iron shell (1) are integrally injection molded. A raised washer (11) is provided at the center of the plastic inner lining (2).

5. A variable-frequency motor rotor iron shell injection molding structure according to claim 4, characterized in that: The washer (11) is located on the inner surface of the boss (10). The washer (11) is made of polytetrafluoroethylene material.

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