Integrated permanent magnet brushless drum motor

Abstract

The application provides a one-piece permanent magnet brushless drum motor, which comprises a rotor, a shaft body is arranged in the rotor, a stator core is fixedly sleeved on the shaft body, two groups of permanent magnets are mounted on the inner side surface of the rotor, the number of permanent magnets in each group is several, a squirrel cage structure is arranged on the stator core, the squirrel cage structure comprises two end rings and a plurality of conducting bars, two bearings and an encoder assembly are mounted on the shaft body; the application cancels the use of an end cover, meanwhile, the shaft body is hollow, which can effectively reduce the overall weight of the product, make the product more lightweight, and make the use more convenient; after the manufacturing of the end cover is reduced, the product manufacturing period can be reduced, the production benefit is improved, and the production cost is effectively reduced; the squirrel cage structure integrally formed by the casting aluminum mode can realize the self-starting of the permanent magnet synchronous drum motor, a frequency conversion system is not needed, the equipment space ratio is reduced, and the actual use is facilitated.

Description

Technical Field

[0001] This invention relates to the field of roller motor technology, and more specifically, to an integrated permanent magnet brushless roller motor. Background Technology

[0002] A drum motor is a power drive device that combines a motor and a drum structure. Also known as an electric drum motor, it is similar to a regular motor, consisting of a stator and a rotor. Based on the principle of electromagnetic induction, when three-phase alternating current is applied to the stator windings, a rotating magnetic field is generated. This rotating magnetic field cuts the rotor conductors, inducing an electromotive force and current in the conductors. The rotor current interacts with the rotating magnetic field to generate an electromagnetic force, which in turn forms an electromagnetic torque, causing the rotor to overcome resistance and begin rotating. However, existing technologies have the following shortcomings in use:

[0003] Existing roller motors mostly use a connection method with two end caps, which results in a large amount of consumables for the motor, a cumbersome overall device, a large size, a heavy weight, and low efficiency. At the same time, the manufacturing process of the end caps is complicated, and problems are prone to occur when connecting them to the roller, leading to machine failure and making them unsuitable for practical use.

[0004] Therefore, there is an urgent need for an integrated permanent magnet brushless roller motor to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the problems that existing roller motors mostly use a connection method with two end caps, which results in a large amount of consumables, a cumbersome overall device, a large size, a heavy weight, and low efficiency. At the same time, the manufacturing process of the end caps is complicated, and problems are prone to occur when connecting them to the roller, leading to machine failure and making them unsuitable for practical use.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An integrated permanent magnet brushless roller motor is proposed to improve the above-mentioned problems.

[0008] The application is as follows:

[0009] An integrated permanent magnet brushless drum motor includes a rotor, a shaft is provided inside the rotor, a stator core is fixedly sleeved on the shaft, two sets of permanent magnets are installed on the inner surface of the rotor, and each set of permanent magnets contains a number of magnets. A squirrel cage structure is provided on the stator core, the squirrel cage structure includes two end rings and a number of guide bars, and two bearings and an encoder assembly are installed on the shaft.

[0010] As a preferred technical solution of this application, the encoder assembly includes a fixed bracket and an encoder, the encoder is mounted on the fixed bracket, and the fixed bracket is mounted on the shaft by two screws.

[0011] As a preferred technical solution of this application, a plurality of the permanent magnets are arranged at equal angles around the rotor.

[0012] As a preferred technical solution of this application, the two end rings are respectively fixedly installed on the left and right end faces of the stator core, and the two end rings are symmetrically distributed about the central axis of the stator core. Several guide bars are located in a ring on the two end rings, and the squirrel cage structure is integrally formed by casting aluminum.

[0013] As a preferred technical solution of this application, a first annular groove is provided on the shaft, and a first retaining spring is provided in the first annular groove. Two second annular grooves are provided on the inner surface of the rotor in a symmetrical arrangement. A second retaining spring is provided in each of the two second annular grooves. The two second retaining springs are respectively attached to two bearings. The first retaining spring is attached to the right end face of one of the bearings. The left end face of one of the bearings is in contact with the shaft, and the right end face of the other bearing is attached to the inner wall of the rotor.

[0014] As a preferred technical solution of this application, two glue storage grooves are formed on the shaft.

[0015] As a preferred technical solution of this application, the shaft body is hollow inside.

[0016] As a preferred technical solution of this application, the rotor is cylindrical.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] In the scheme of this application:

[0019] 1. This invention eliminates the use of end caps, and the shaft is hollow, which can effectively reduce the overall weight of the product, making it lighter and more convenient to use. By reducing the production of end caps, the product manufacturing cycle can be shortened, and production efficiency can be improved.

[0020] 2. The squirrel cage structure, which is integrally formed by casting aluminum, enables the permanent magnet synchronous drum motor to start automatically, eliminating the need for a frequency converter system, reducing the space occupied by the equipment, and facilitating practical use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall cross-sectional structure of an integrated permanent magnet brushless drum motor provided in this application.

[0022] Figure 2 This is a schematic diagram of the stator assembly in an integrated permanent magnet brushless drum motor provided in this application.

[0023] Figure 3An exploded structural diagram of an integrated permanent magnet brushless roller motor provided in this application.

[0024] Figure 4 This is a structural schematic diagram of the central shaft of an integrated permanent magnet brushless drum motor provided in this application.

[0025] Figure 5 A three-dimensional structural diagram of an integrated permanent magnet brushless roller motor provided in this application.

[0026] Figure 6 This is an exploded structural diagram of the stator assembly in an integrated permanent magnet brushless drum motor provided in this application.

[0027] Figure 7 This is a schematic diagram of the encoder assembly in an integrated permanent magnet brushless drum motor provided in this application.

[0028] The image shows:

[0029] 1. Rotor; 2. Shaft; 3. Stator core; 4. Permanent magnet; 5. End ring; 6. Guide bar; 7. Bearing; 8. Fixing bracket; 9. Encoder; 10. First annular groove; 11. First snap ring; 12. Second annular groove; 13. Second snap ring; 14. Glue storage groove. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0031] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] Example:

[0036] like Figure 1-7 As shown, the integrated permanent magnet brushless drum motor proposed in this embodiment includes a rotor 1, a shaft 2 is provided inside the rotor 1, a stator core 3 is fixedly sleeved on the shaft 2, two sets of permanent magnets 4 are installed on the inner surface of the rotor 1, and the number of permanent magnets 4 in each set is several, a squirrel cage structure is provided on the stator core 3, the squirrel cage structure includes two end rings 5 ​​and several guide bars 6, the several guide bars 6 are used to cut the magnetic field generated by the stator core 3 after being energized, so that after the electromotive force is induced in the guide bars 6, the guide bars 6 move in the magnetic field to drive the rotor 1 to rotate, and two bearings 7 and an encoder assembly are installed on the shaft 2.

[0037] like Figure 1 and Figure 7 As shown, the encoder assembly includes a fixed bracket 8 and an encoder 9. The encoder 9 is mounted on the fixed bracket 8, which is mounted on the shaft 2 by two screws. The encoder 9 is used to monitor the position and speed of the rotor 1 in real time and provide feedback signals to the external control system to achieve precise control.

[0038] like Figure 3 As shown, several permanent magnets 4 are arranged at equal angles around the rotor 1, and a stable main magnetic field can be generated inside the motor through the multiple permanent magnets 4.

[0039] like Figure 2 and Figure 6 As shown, two end rings 5 ​​are fixedly installed on the left and right end faces of the stator core 3, and the two end rings 5 ​​are symmetrically distributed about the central axis of the stator core 3. Several guide bars 6 are arranged in a ring on the two end rings 5. The squirrel cage structure is integrally formed by casting aluminum. The squirrel cage structure integrally formed by casting aluminum can realize the self-starting of the permanent magnet synchronous drum motor, without the need for a frequency conversion system, reducing the space occupied by the equipment and facilitating practical use.

[0040] like Figure 1 and Figure 4As shown, a first annular groove 10 is provided on the shaft 2, and a first retaining spring 11 is engaged in the first annular groove 10. Two second annular grooves 12 are provided on the inner surface of the rotor 1 in a symmetrical arrangement. A second retaining spring 13 is engaged in each of the two second annular grooves 12. The two second retaining springs 13 are respectively engaged with the two bearings 7. The first retaining spring 11 is engaged with the right end face of one of the bearings 7. The left end face of one of the bearings 7 is in contact with the shaft 2. The right end face of the other bearing 7 is engaged with the inner wall of the rotor 1. Through the cooperation of the first retaining spring 11, the second retaining spring 13, the rotor 1 and the shaft 2, the two bearings 7 can be axially positioned.

[0041] like Figure 4 As shown, two glue storage grooves 14 are provided on the shaft body 2, which can ensure the tightness of the connection between the stator core 3 and the shaft body 2.

[0042] like Figure 1 As shown, the shaft 2 is hollow inside, which reduces the weight of the shaft 2.

[0043] like Figure 3 As shown, rotor 1 is cylindrical.

[0044] As shown in the figure below, after removing the end cap design, the temperature rise test shows that the stability of the motor roller during operation can be guaranteed. In the test, the current, temperature, dragging frequency and package weight were recorded under the dragging test. Two motor roller specifications were tested on a trolley. The comparison details are as follows.

[0045] 1. Start-stop frequency: 3600 start-stop cycles / hour, acceleration 5m / s^2, speed 1000rpm, temperature rise 38.7K.

[0046] 2. Running at 1000 rpm for an extended period, the temperature rise was tested at 37 K.

[0047] 3. Confirmation of acceleration for different weights: The heaviest is 30kg, with an acceleration of 5m / s^2. It is confirmed that the maximum acceleration can be maintained at 30kg. The acceleration curve of 0~3.5m / s for 30kg is slightly separated. It can be kept up with the acceleration of 0~2.8m / s in 0.7s.

[0048] 4. Durability test: The motor was tested under the condition of running at 5A for 72 hours without any faults.

[0049] 5. The decibel meter should be 1m away from the electric drum. During the test, record the maximum decibel value and the initial ambient decibel value when switching between forward and reverse rotation.

[0050]

[0051] Specifically, in use, this integrated permanent magnet brushless drum motor uses several guide bars 6 to cut the magnetic field generated by the stator core 3 after it is energized. After the guide bars 6 induce an electromotive force, they move in the magnetic field to drive the rotor 1 to rotate. The squirrel cage structure, which is integrally formed by casting aluminum, enables the permanent magnet synchronous drum motor to start automatically without the need for a frequency converter system, reducing the space occupied by the equipment and facilitating practical use. In this application, the use of end caps has been eliminated. At the same time, the shaft 2 is hollow, which can effectively reduce the overall weight of the product, making it lighter and more convenient to use. By reducing the production of end caps, the production cycle can be shortened, production efficiency can be improved, and production costs can be effectively reduced.

[0052] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. An integrated permanent magnet brushless drum motor comprising a rotor (1), characterized in that, The rotor (1) is internally provided with a shaft body (2), the shaft body (2) is fixedly sleeved with a stator core (3), the inner side surface of the rotor (1) is mounted with two groups of permanent magnets (4), and the number of permanent magnets (4) in each group is several, the stator core (3) is provided with a squirrel cage structure, the squirrel cage structure comprises two end rings (5) and a plurality of conducting strips (6), the shaft body (2) is mounted with two bearings (7) and an encoder assembly, the encoder assembly comprises a fixed support (8) and an encoder (9), the encoder (9) is mounted on the fixed support (8), the fixed support (8) is mounted on the shaft body (2) by two screws, a plurality of the permanent magnets (4) are arranged at equal angles about the rotor (1), the two end rings (5) are fixedly installed on the left and right side end faces of the stator core (3) respectively, and the two end rings (5) are symmetrically distributed about the central axis of the stator core (3), a plurality of the conducting strips (6) are annularly located on the two end rings (5), the squirrel cage structure is integrally formed in a cast aluminum manner, the shaft body (2) is provided with a first annular clamping groove (10), the first annular clamping groove (10) is clamped with a first clamping spring (11), the inner side surface of the rotor (1) is provided with two symmetrically distributed second annular clamping grooves (12), the two second annular clamping grooves (12) are clamped with second clamping springs (13) respectively, the two second clamping springs (13) are respectively attached to the two bearings (7), the first clamping spring (11) is attached to the right side end face of one of the bearings (7), the left end face of one of the bearings (7) is in contact with the shaft body (2), and the right end face of the other bearing (7) is attached to the inner wall of the rotor (1).

2. An integrated permanent magnet brushless drum motor according to claim 1, characterized in that, The shaft body (2) is provided with two glue storage grooves (14).

3. An integrated permanent magnet brushless drum motor according to claim 1, characterized in that, The shaft body (2) is hollow.

4. An integrated permanent magnet brushless drum motor according to claim 1, characterized in that, The rotor (1) is cylindrical.

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