Integrated permanent magnet brushless roller motor

Abstract

The invention provides an integrated permanent magnet brushless roller motor which comprises a rotor, a shaft body is arranged in the rotor, the shaft body is fixedly sleeved with a stator iron core, two sets of permanent magnets are installed on the surface of the inner side of the rotor, the number of each set of permanent magnets is multiple, and a mouse cage structure is arranged on the stator iron core. The squirrel cage structure comprises two end rings and a plurality of guide strips, and two bearings and an encoder assembly are mounted on the shaft body; the use of an end cover is omitted, meanwhile, the shaft body is hollow, the overall weight of a product can be effectively reduced, the product is lighter and more convenient to use, after the manufacturing of the end cover is reduced, the manufacturing period of the product can be shortened, the production benefit is improved, and the production cost is effectively reduced; self-starting of the permanent magnet synchronous roller motor can be achieved through the mouse cage structure integrally formed in an aluminum casting mode, a frequency conversion system does not need to be arranged, the occupied space of equipment is reduced, and actual use is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of drum motors, and more particularly, to an integrated permanent magnet brushless drum motor. Background Art

[0002] A drum motor is a power drive device that combines a motor and a drum structure, also known as an electric drum. Similar to a common motor, it consists of a stator and a rotor. Based on the principle of electromagnetic induction, when three-phase alternating current is applied to the stator winding of the motor, a rotating magnetic field is generated. This rotating magnetic field cuts the rotor conductors, generating induced electromotive force and induced current in the rotor conductors. The rotor current interacts with the rotating magnetic field to generate electromagnetic force, and then forms an electromagnetic torque, causing the rotor to overcome the resistance torque and start rotating. However, the prior art has the following deficiencies in use: Most of the existing drum motors adopt a connection method with two end covers, resulting in more consumables for the overall motor, a cumbersome overall device, large volume, heavy weight, low efficiency. At the same time, the manufacturing process of the end covers is complicated, and problems are likely to occur in the connection with the drum, leading to machine failures and being not conducive to actual use.

[0003] Therefore, there is an urgent need for an integrated permanent magnet brushless drum motor to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to address the problems existing in the current situation that most of the existing drum motors adopt a connection method with two end covers, resulting in more consumables for the overall motor, a cumbersome overall device, large volume, heavy weight, low efficiency. At the same time, the manufacturing process of the end covers is complicated, and problems are likely to occur in the connection with the drum, leading to machine failures and being not conducive to actual use.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: An integrated permanent magnet brushless drum motor to improve the above problems.

[0006] Specifically, this application is as follows: An integrated permanent magnet brushless drum motor includes a rotor. An axle body is arranged inside the rotor. A stator core is fixedly sleeved on the axle body. Two groups of permanent magnets are installed on the inner side surface of the rotor, and the number of each group of permanent magnets is several. A squirrel-cage structure is arranged on the stator core. The squirrel-cage structure includes two end rings and several bars. Two bearings and an encoder assembly are installed on the axle body.

[0007] As a preferred technical solution of this application, the encoder assembly includes a fixed bracket and an encoder. The encoder is installed on the fixed bracket, and the fixed bracket is installed on the axle body through two screws.

[0008] As a preferred technical solution of the present application, several of the permanent magnets are arranged at equal angles in a circle around the rotor.

[0009] As a preferred technical solution of the present 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 of the conducting bars are annularly located on the two end rings, and the squirrel-cage structure is integrally formed by die-casting aluminum.

[0010] As a preferred technical solution of the present application, a first annular clamping groove is formed on the shaft body, a first snap ring is clamped in the first annular clamping groove, two symmetrically distributed second annular clamping grooves are formed on the inner surface of the rotor, second snap rings are clamped in the two second annular clamping grooves respectively, the two second snap rings are respectively in contact with the two bearings, the first snap ring is in contact with the right end face of one of the bearings, the left end face of one of the bearings is in contact with the shaft body, and the right end face of the other bearing is in contact with the inner wall of the rotor.

[0011] As a preferred technical solution of the present application, two glue storage grooves are formed on the shaft body.

[0012] As a preferred technical solution of the present application, the inside of the shaft body is hollow.

[0013] As a preferred technical solution of the present application, the rotor is cylindrical.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: In the solution of the present application: 1. In the present invention, the use of end covers is cancelled. At the same time, the shaft body is hollow, which can effectively reduce the overall weight of the product, make it lighter, and more convenient to use. After reducing the production of end covers, the production cycle of the product can be shortened, and the production efficiency can be improved.

[0015] 2. The squirrel-cage structure integrally formed by die-casting aluminum can realize the self-starting of the permanent magnet synchronous drum motor, without the need to be equipped with a frequency conversion system, reducing the occupied space of the equipment, which is beneficial to actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is an overall cross-sectional structure schematic diagram of an integrated permanent magnet brushless drum motor provided by the present application.

[0017] Figure 2 FIG. is a structure schematic diagram of a stator assembly in an integrated permanent magnet brushless drum motor provided by the present application.

[0018] Figure 3 FIG. is an exploded structure schematic diagram of an integrated permanent magnet brushless drum motor provided by the present application.

[0019] Figure 4 Schematic structural diagram of the shaft body of an integrated permanent magnet brushless drum motor provided by this application.

[0020] Figure 5 Schematic three-dimensional structure diagram of an integrated permanent magnet brushless drum motor provided by this application.

[0021] Figure 6 Exploded structural diagram of the stator assembly in an integrated permanent magnet brushless drum motor provided by this application.

[0022] Figure 7 Schematic structural diagram of the encoder assembly in an integrated permanent magnet brushless drum motor provided by this application.

[0023] Labels in the figure: 1. Rotor; 2. Shaft body; 3. Stator core; 4. Permanent magnet; 5. End ring; 6. Bar; 7. Bearing; 8. Fixed bracket; 9. Encoder; 10. First annular card slot; 11. First circlip; 12. Second annular card slot; 13. Second circlip; 14. Glue storage groove. Specific embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention.

[0025] Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed present invention, but merely represents some embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0026] It should be noted that, without conflict, the embodiments in the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present invention 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 on the present invention. In addition, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0029] Embodiment: As Figures 1-7 shown, an integrated permanent magnet brushless drum motor proposed in this embodiment includes a rotor 1. Inside the rotor 1, a shaft body 2 is provided. A stator core 3 is fixedly sleeved on the shaft body 2. Two groups of permanent magnets 4 are installed on the inner side surface of the rotor 1, and the number of each group of permanent magnets 4 is several. A squirrel-cage structure is provided on the stator core 3. The squirrel-cage structure includes two end rings 5 and several bars 6. Through the several bars 6, it is used to cut the magnetic field generated after the stator core 3 is energized, so that after an electromotive force is induced in the bars 6, the bars 6 move in the magnetic field to drive the rotor 1 to rotate. Two bearings 7 and an encoder assembly are installed on the shaft body 2.

[0030] As Figure 1 and Figure 7 shown, the encoder assembly includes a fixed bracket 8 and an encoder 9. The encoder 9 is installed on the fixed bracket 8. The fixed bracket 8 is installed on the shaft body 2 through two screws. By providing the encoder 9, it is used to monitor the position and speed of the rotor 1 in real time and provide a feedback signal to an external control system to achieve precise control.

[0031] As Figure 3 shown, several permanent magnets 4 are arranged at equal angles in a circle with respect to the rotor 1. A stable main magnetic field can be generated inside the motor through the multiple permanent magnets 4.

[0032] As Figure 2 and Figure 6 shown, the two end rings 5 are respectively fixedly installed on the left and right end faces of the stator core 3, and the two end rings 5 are symmetrically distributed with respect to the central axis of the stator core 3. Several bars 6 are annularly located on the two end rings 5. The squirrel-cage structure is integrally formed by die-casting aluminum. The squirrel-cage structure integrally formed by die-casting aluminum can realize the self-starting of the permanent magnet synchronous drum motor, without the need to be equipped with a frequency conversion system, reducing the occupied space of the equipment and being beneficial to actual use.

[0033] As Figure 1 and Figure 4As shown, a first annular clamping groove 10 is formed on the shaft body 2, a first clamping spring 11 is clamped in the first annular clamping groove 10, two symmetrically distributed second annular clamping grooves 12 are formed on the inner surface of the rotor 1, second clamping springs 13 are clamped in the two second annular clamping grooves 12 respectively, the two second clamping springs 13 are respectively in contact with the two bearings 7, the first clamping spring 11 is in contact 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 body 2, and the right end face of the other bearing 7 is in contact with the inner wall of the rotor 1. Through the cooperation of the first clamping spring 11, the second clamping springs 13, the rotor 1 and the shaft body 2, axial positioning of the two bearings 7 can be achieved.

[0034] As Figure 4 shown, two glue storage grooves 14 are formed on the shaft body 2, which can ensure the tightness of the connection between the stator core 3 and the shaft body 2.

[0035] As Figure 1 shown, the inside of the shaft body 2 is hollow, which can reduce the weight of the shaft body 2.

[0036] As Figure 3 shown, the rotor 1 is in a cylindrical shape.

[0037] As shown in the following figure, after canceling the end cover design, through the temperature rise test, it can be known that the stability of the motor drum during operation can be ensured. Among them, in the test of the counter-rotating test, the current, temperature, counter-rotating frequency, and package weight are recorded. Two motor specification drums are tested on the trolley, and the comparison details are as follows; 1. Start-stop frequency: The frequency is 3600 starts and stops per hour, the acceleration is 5 m / s^2, the rotational speed is 1000 rpm, and the measured temperature rise is 38.7 K; 2. Rotational speed of 1000 rpm, long-term operation, measured temperature rise of 37 K; 3. Confirmation of different heavy object accelerations: The heaviest is 30 kg, the acceleration is 5 m / s^2, and it is confirmed that the maximum acceleration that can be maintained is 30 kg; The acceleration curves of 30 kg from 0 to 3.5 m / s are slightly separated, and it can keep up by changing to an acceleration of 0 to 2.8 m / s for 0.7 s.

[0038] 4. Durability test: The motor current is controlled at 5 A and operated for 72 hours. Tested under this condition, there is no failure.

[0039] 5. The sound level meter is 1 m away from the electric drum, and the maximum sound level value and the initial ambient sound level are recorded during the test run when the forward and reverse rotations are switched;

[0040] Specifically, when the integrated permanent magnet brushless drum motor is in use: through a plurality of bars 6, which are used to cut the magnetic field generated after the stator core 3 is electrified, so that after an electromotive force is induced in the bars 6, the bars 6 move in the magnetic field to drive the rotor 1 to rotate. The squirrel-cage structure integrally formed by the die-casting aluminum method can realize the self-start of the permanent magnet synchronous drum motor, without the need to be equipped with a frequency conversion system, reducing the occupied space of the equipment, which is beneficial to actual use. In this application, the use of end covers is cancelled. At the same time, the shaft body 2 is hollow, which can effectively reduce the overall weight of the product, making it lighter and more convenient to use. After reducing the production of end covers, the production cycle of the product can be reduced, the production efficiency can be improved, and the production cost can be effectively reduced.

[0041] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above respective embodiments, the present invention is not limited to the above specific embodiments. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and their improvements that do not depart from the spirit and scope of the invention are covered by 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: A shaft body (2) is arranged inside the rotor (1), a stator core (3) is fixedly sleeved on the shaft body (2), two groups of permanent magnets (4) are mounted on the inner surface of the rotor (1), and each group of permanent magnets (4) has a plurality of permanent magnets, a squirrel cage structure is arranged on the stator core (3), the squirrel cage structure comprises two end rings (5) and a plurality of guide bars (6), and two bearings (7) and an encoder assembly are mounted on the shaft body (2).

2. The integrated permanent magnet brushless drum motor according to claim 1, characterized in that: The encoder assembly comprises a fixed bracket (8) and an encoder (9), wherein the encoder (9) is mounted on the fixed bracket (8), and the fixed bracket (8) is mounted on the shaft body (2) via two screws.

3. The integrated permanent magnet brushless drum motor according to claim 1, characterized in that: The plurality of permanent magnets (4) are arranged at equal angles around the rotor (1).

4. The integrated permanent magnet brushless drum motor according to claim 1, characterized in that: The two end rings (5) are respectively fixedly mounted on the left and right end surfaces of the stator core (3), and the two end rings (5) are symmetrically distributed about the central axis of the stator core (3), a plurality of the guide bars (6) are annularly located on the two end rings (5), and the squirrel cage structure is integrally formed by cast aluminum.

5. The integrated permanent magnet brushless drum motor according to claim 1, characterized in that: The shaft body (2) is provided with a first annular retaining groove (10), a first retaining spring (11) is retained in the first annular retaining groove (10), the inner surface of the rotor (1) is provided with two symmetrically distributed second annular retaining grooves (12), a second retaining spring (13) is retained in each of the two second annular retaining grooves (12), the two second retaining springs (13) are respectively fitted with two bearings (7), the first retaining spring (11) is fitted 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 body (2), and the right end face of the other bearing (7) is fitted with the inner wall of the rotor (1).

6. The integrated permanent magnet brushless drum motor according to claim 1, characterized in that: Two glue storage grooves (14) are provided on the shaft body (2).

7. The integrated permanent magnet brushless drum motor according to claim 1, characterized in that: The interior of the shaft body (2) is hollow.

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

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