External rotor of permanent magnet frequency conversion generator

Abstract

An external rotor of a permanent magnet frequency conversion generator relates to the technical field of generator equipment, and improves heat dissipation in a rotor shell and reduces difficulty of rotation driving of the rotor by improving a rotor connecting sleeve and a rotor shell driving structure. According to the scheme, the rotor comprises a rotor shell, permanent magnets are arranged on the periphery of the inner wall of the rotor shell, and a connecting sleeve assembly is arranged at one end of the rotor shell; the connecting sleeve assembly comprises a bottom plate, the edge of the bottom plate is connected with the rotor shell, and a sleeve is arranged in the middle of the bottom plate; a first mounting hole is formed in the middle of the sleeve, a plurality of hollow holes are formed in the circumferential direction of the middle of the connecting bottom plate, and the side, away from the rotor shell, of the bottom plate is used for mounting a heat dissipation device; and a driving gear ring is arranged at the other end of the rotor shell.

Description

Technical Field

[0001] This utility model relates to the field of generator equipment technology, specifically to an external rotor for a permanent magnet variable frequency generator. Background Technology

[0002] The motor rotor refers to the rotating part of a motor, and is divided into electric motor rotors and generator rotors. Electric motor rotors are further divided into two types: internal rotor rotation and external rotor rotation. In the internal rotor rotation type, the core of the motor is the rotating body, outputting torque (for electric motors) or receiving energy (for generators). In the external rotor rotation type, the outer body of the motor is the rotating body. These different types facilitate applications in various situations.

[0003] External rotor generators have unique advantages in certain applications, such as wind power generation and electric vehicle drive motors. However, external rotor generators also have the following problems: First, the external rotor structure causes the stator windings to be surrounded by the rotor, making maintenance and repair more difficult, limiting the heat dissipation path, and making it difficult to effectively dissipate heat. Second, due to the larger rotor mass, the external rotor structure may require greater torque during startup. Utility Model Content

[0004] I. Technical problems to be solved

[0005] This invention addresses the shortcomings of existing technologies by proposing an external rotor for a permanent magnet variable frequency generator. By improving the rotor connecting sleeve and the rotor housing drive structure, the heat dissipation performance inside the rotor housing is enhanced.

[0006] II. Specific Technical Solutions

[0007] An external rotor for a permanent magnet variable frequency generator includes a rotor housing. Permanent magnets are arranged around the inner wall of the rotor housing. A connecting sleeve assembly is located at one end of the rotor housing. The connecting sleeve assembly includes a base plate, the edge of which is connected to the rotor housing. A sleeve is located in the center of the base plate. A first mounting hole is formed in the center of the sleeve. Multiple perforated holes are formed circumferentially in the center of the connecting base plate. The side of the base plate away from the rotor housing is used for mounting a heat dissipation device. A drive gear ring is located at the other end of the rotor housing.

[0008] Implementation principle and working principle:

[0009] In the production of the external rotor of this solution, the connecting sleeve assembly and the rotor housing are assembled sequentially. The sleeve of the connecting sleeve assembly is connected to the power component, such as the output end of the engine. The first mounting hole facilitates rotor installation and driving. In addition, the connecting sleeve assembly facilitates the installation of the heat dissipation device and the airflow through the perforated holes, which facilitates heat dissipation.

[0010] Preferably, a drive gear ring is provided at the other end of the rotor housing; the advantage of this preferred embodiment is that the gear ring facilitates the operation of the engine by using the drive gear ring on the rotor housing during reverse drag start, or the engine (engine starter motor) directly drives the generator, which is a powerful function.

[0011] Preferably, a mounting bracket is fixedly provided inside the rotor housing, and the mounting bracket is provided with a second mounting hole around the inner wall of the rotor housing. The second mounting hole is used for mounting the permanent magnet. In this solution, the permanent magnet is mounted on the mounting bracket, and then the mounting bracket is installed inside the rotor housing. This installation method can better prevent the permanent magnet from falling off during rotation and has better connection strength.

[0012] Preferably, a third mounting hole is provided on the side of the connecting sleeve away from the rotor housing. The third mounting hole is located between the hollow hole and the outer edge of the sleeve. The third mounting hole is used for mounting the heat dissipation device, which is a cooling fan. The advantage of this preferred embodiment is that by setting the heat dissipation device (cooling fan), it is convenient to pass the cooling air into the rotor through the hollow hole to achieve cooling.

[0013] Preferably, the base plate is further provided with multiple reinforcing ribs, with both ends of the reinforcing ribs respectively located radially on the base plate and at both ends of the perforated holes; the beneficial effect of this preferred embodiment is that the strength of the base plate is effectively ensured by the setting of the reinforcing ribs, resulting in a longer service life.

[0014] Preferably, the outer side of the base plate is provided with grooves, and there are multiple grooves spaced apart around the outer edge of the base plate; the inner wall of the rotor housing is also provided with protrusions corresponding to the grooves; there are four grooves, which are evenly spaced around the base plate; the base plate and the rotor housing are connected by pressing the grooves and protrusions together; the advantage of this preferred embodiment is that this solution can achieve the connection between the base plate and the rotor housing simply by pressing the grooves and protrusions together, which is simple and convenient.

[0015] Preferably, the rotor housing is a cylindrical housing, which is formed by rolling and splicing steel plates. The advantage of this preferred method is that it produces less waste and has a higher material utilization rate.

[0016] The beneficial effects of this utility model are as follows:

[0017] In actual use, the external rotor of this design consists of a connecting sleeve assembly, a rotor housing, and a drive gear ring assembled sequentially. The drive gear ring is used to connect with power components, such as the output end of an engine. This driving method is more labor-saving than the method of rotating the housing by a shaft. The first mounting hole facilitates rotor installation and rotor driving. More specifically, the connecting sleeve assembly facilitates the installation of a heat dissipation device and also facilitates heat dissipation through the perforated holes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the external rotor in an embodiment of this utility model.

[0019] Figure 2 This is a schematic diagram of the mounting bracket according to an embodiment of the present utility model.

[0020] Figure 3 This is a side view of the external rotor of an embodiment of the present utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Rotor housing; 2. Permanent magnet; 3. Base plate; 4. Sleeve; 5. First mounting hole; 6. Hollow hole; 7. Drive gear ring; 8. Mounting bracket; 9. Second mounting hole; 10. Third mounting hole; 11. Reinforcing rib; 12. Groove. Detailed Implementation

[0023] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this utility model can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] like Figure 1-3 As shown:

[0025] An external rotor for a permanent magnet variable frequency generator specifically includes a rotor housing 1 and a connecting sleeve assembly.

[0026] In implementation, the rotor housing 1 is specifically a cylindrical housing, which is made of rolled and welded steel plates, which can effectively reduce waste and improve material utilization. The connecting sleeve assembly includes a base plate 3, and a sleeve 4 is integrally formed or welded in the middle of the base plate 3. Specifically, the edge of the base plate 3 is connected to the inner side of the rotor housing 1 by welding or snap-fitting. In this solution, a groove 12 is provided on the edge of the base plate 3, and a protrusion is provided on the edge of the inner side of the rotor housing 1. The rotor housing 1 and the base plate 3 are connected by pressing through the protrusion and the groove 12. After the rotor housing 1 and the base plate 3 are connected, the sleeve 4 is located inside the rotor housing 1.

[0027] In implementation, a first mounting hole 5 is provided axially on the sleeve 4, wherein the first mounting hole 5 is used to fit the rotor as a whole onto the corresponding mounting shaft; a mounting frame 8 is connected inside the rotor housing 1 by welding or snap-fitting, wherein the mounting frame 8 is a circular frame structure, and a second mounting hole 9 is provided around the circumference of the mounting frame 8, wherein there are multiple second mounting holes 9, which are evenly spaced around the circumference of the mounting frame 8, wherein a matching permanent magnet 2 is provided in the second mounting hole, and the permanent magnet 2 is reinforced and fixed by adhesive bonding.

[0028] In implementation, multiple perforated holes 6 are evenly spaced around the base plate 3, ensuring smooth airflow. A third mounting hole 10 is provided on the side of the base plate 3 away from the rotor housing 1. There are multiple third mounting holes 10, all located within the annular surface between the perforated holes 6 and the sleeve. Specifically, there are four third mounting holes 10, all threaded holes, allowing the heat dissipation device to be installed at the third mounting hole 10 using bolts or screws. Specifically, the heat dissipation device is preferably a cooling fan, which is driven by the rotation of the rotor to generate airflow, thereby dissipating heat from the stator inside the rotor. In implementation, to ensure the connection strength of the base plate 3, multiple reinforcing ribs 11 are integrally formed or welded onto the base plate. These reinforcing ribs are arranged radially along the base plate 3, and are distributed around the circumference of the base plate 3.

[0029] In the production of this external rotor, the connecting sleeve assembly, rotor housing 1, and drive gear ring 7 are assembled sequentially. Then, the mounting bracket 8 and permanent magnet 2 are fixedly set on the inner wall of the rotor housing 1. The entire assembly is then installed onto the rotating shaft via the connecting sleeve assembly. In practical applications, the drive gear ring 7 is connected to the power component, such as the output end of an engine. This driving method is more labor-saving than the method of rotating the housing by rotating the shaft. The drive gear ring 7 can also drive the engine during reverse drag starting, making engine starting easier. The power for the cooling device can be provided by the rotor itself, and the airflow generated can directly act on the rotor and its windings inside the rotor housing 1 through the perforated holes, making heat dissipation simple and convenient.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims.

Claims

1. An external rotor for a permanent magnet variable frequency generator, comprising a rotor housing (1), characterized in that: The inner wall of the rotor housing (1) is provided with a permanent magnet (2) around its perimeter, and a connecting sleeve assembly is provided at one end of the rotor housing (1); the connecting sleeve assembly includes a base plate (3), the edge of the base plate (3) is connected to the rotor housing (1), a sleeve (4) is provided in the middle of the base plate (3), and the sleeve (4) is located inside the rotor housing (1); a first mounting hole (5) is provided in the middle of the sleeve (4), and multiple hollow holes (6) are provided in the circumferential direction in the middle of the base plate (3), and the side of the base plate (3) away from the rotor housing (1) is used for the installation of a heat dissipation device.

2. The external rotor for a permanent magnet variable frequency generator according to claim 1, characterized in that: The other end of the rotor housing (1) is provided with a drive gear ring (7).

3. The external rotor for a permanent magnet variable frequency generator according to claim 1, characterized in that: An installation bracket (8) is fixedly provided inside the rotor housing (1). The installation bracket (8) is provided with a second installation hole (9) around the inner wall of the rotor housing (1). The second installation hole (9) is used for installing the permanent magnet (2).

4. The external rotor for a permanent magnet variable frequency generator according to claim 1, characterized in that: A third mounting hole (10) is provided on the side of the base plate (3) away from the rotor housing (1). The third mounting hole (10) is located between the hollow hole (6) and the outer edge of the sleeve (4). The third mounting hole (10) is used for the installation of the heat dissipation device.

5. The external rotor for a permanent magnet variable frequency generator according to claim 1, characterized in that: The base plate (3) is also provided with multiple reinforcing ribs (11), the two ends of which are respectively located in the radial direction of the base plate (3) and at both ends of the hollow hole (6).

6. The external rotor for a permanent magnet variable frequency generator according to claim 1, characterized in that: The outer side of the base plate (3) is also provided with a groove (12), and there are multiple grooves (12) arranged at intervals around the outer edge of the base plate; the inner wall of the rotor housing (1) is also provided with a protrusion corresponding to the groove (12).

7. The external rotor for a permanent magnet variable frequency generator according to claim 6, characterized in that: There are four grooves (12), which are evenly spaced around the bottom plate (3); the bottom plate (3) and the rotor housing (1) are connected by the grooves (12) and the protrusions.

8. The external rotor for a permanent magnet variable frequency generator according to claim 1, characterized in that: The rotor housing (1) is a cylindrical housing, and the rotor housing (1) is formed by rolling and splicing steel plates.

9. The external rotor for a permanent magnet variable frequency generator according to claim 1, characterized in that: The heat dissipation device is a cooling fan.

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