A direct current motor rotor structure

Abstract

The utility model discloses a direct current motor rotor structure relates to the rotor field of direct current motor, including the rotor of the fixed composition of the silicon steel sheet stack of a plurality, the channel on the rotor installs the coil seat, the outer periphery of coil seat is wound and has the coil, the interference of the central hole of rotor is installed and has the rotating shaft, the outer wall one end of rotating shaft is equipped with the commutator, and the inside installation of rotating shaft has the heat abstract mechanism. The utility model discloses through setting heat abstract mechanism, not only realized the heat dissipation through -hole of opening in rotating shaft, and guaranteed the design of heat abstract mechanism, will not influence the rigidity, intensity and stability of rotating shaft.

Description

Technical Field

[0001] This utility model relates to the field of DC motor rotors, specifically a DC motor rotor structure. Background Technology

[0002] DC motor rotors are divided into brushed DC motors and brushless DC motors. The rotor of a brushed DC motor is the rotor winding.

[0003] In the long-term use of the rotor windings of existing brushed DC motors, the temperature of the rotating shaft installed at the center of the rotor windings will rise due to friction and heat transfer from the rotor windings. If the heat cannot be dissipated in time, it will lead to thermal deformation caused by heat accumulation. In the existing technology, a heat dissipation hole can be opened at the center of the rotating shaft to increase the heat dissipation efficiency, but this method will reduce the service life of the rotating shaft. Utility Model Content

[0004] The purpose of this utility model is to provide a DC motor rotor structure in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a DC motor rotor structure, comprising a rotor composed of multiple stacked and fixed silicon steel sheets, a coil seat installed on the slot of the rotor, a coil wound around the outer periphery of the coil seat, a rotating shaft interference-fitted at the center hole of the rotor, a commutator assembled at one end of the outer wall of the rotating shaft, and a heat dissipation mechanism installed inside the rotating shaft.

[0006] As a further embodiment of this utility model: the heat dissipation mechanism includes a heat dissipation through hole opened at the center of the inside of the rotating shaft, the front end of the heat dissipation through hole is a closed structure, and the rear end of the heat dissipation through hole is an open structure.

[0007] As a further embodiment of this utility model: the heat dissipation mechanism further includes a plurality of reinforcing members fixedly welded to the inner wall of the heat dissipation through hole. The reinforcing members have a 180-degree spiral structure, and both ends of one of the reinforcing members are planar structures. The plurality of reinforcing members are connected end to end in sequence, and the ends of adjacent reinforcing members are staggered at 90 degrees.

[0008] As a further embodiment of this utility model: the heat dissipation mechanism further includes two heat dissipation outlets opened at one end of the outer circumference of the rotating shaft. The heat dissipation outlets are connected to the inner cavity of the heat dissipation through hole, and the two heat dissipation outlets are symmetrically distributed in the direction of the closed end of the heat dissipation through hole.

[0009] As a further improvement of this utility model, the coil holder has outwardly protruding limiting portions formed on both sides, which are used to limit the coil.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. By setting up a heat dissipation mechanism, not only are heat dissipation holes opened on the rotating shaft, but the design of the heat dissipation mechanism is also ensured that it will not affect the rigidity, strength and stability of the rotating shaft. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the structure of this utility model from another perspective;

[0014] Figure 3 This is a schematic diagram of the internal structure of the present invention;

[0015] Figure 4 This is a schematic diagram showing the connection between adjacent reinforcing members of this utility model.

[0016] In the diagram: 1. Rotor; 2. Coil holder; 3. Coil; 4. Rotating shaft; 5. Commutator; 6. Heat dissipation hole; 7. Reinforcing member; 8. Heat dissipation outlet. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-4 In this embodiment of the present invention, a DC motor rotor structure includes a rotor 1 composed of multiple stacked and fixed silicon steel sheets. A coil seat 2 is installed on the slot of the rotor 1, and a coil 3 is wound around the outer periphery of the coil seat 2. A rotating shaft 4 is interference-fitted at the center hole of the rotor 1. A commutator 5 is assembled at one end of the outer wall of the rotating shaft 4, and a heat dissipation mechanism is installed inside the rotating shaft 4.

[0019] In this embodiment: After the rotor structure is assembled into a motor, a cooling fan is installed at the tail end of the motor (this cooling fan does not refer to the fan blades coaxially connected to the rotating shaft 4, but to an independently operating fan). When the starting device is running, the independent cooling fan is started simultaneously. The suction generated by the operation of the cooling fan draws in external air, forming forced convection and accelerating airflow. Some of the air enters the heat dissipation mechanism during the flow, achieving efficient heat dissipation of the rotating shaft 4. This avoids the problem of the rotating shaft 4's temperature rising during operation due to friction, eddy currents, and the inability to dissipate heat conducted by the rotor 1 in time, which would cause thermal deformation and a decrease in material properties.

[0020] Please refer to this carefully. Figure 1 , Figure 2 , Figure 3 and Figure 4 The heat dissipation mechanism includes a heat dissipation through hole 6 located at the center of the interior of the rotating shaft 4. The front end of the heat dissipation through hole 6 is closed, and the rear end is open. The heat dissipation mechanism also includes multiple reinforcing members 7 fixedly welded to the inner wall of the heat dissipation through hole 6. The reinforcing members 7 are spirally arranged at 180 degrees, and both ends of each reinforcing member 7 are planar. The multiple reinforcing members 7 are connected end to end in sequence, and the ends of adjacent reinforcing members 7 are staggered at 90 degrees. The heat dissipation mechanism also includes two heat dissipation outlets 8 located at one end of the outer circumference of the rotating shaft 4. The heat dissipation outlets 8 are connected to the inner cavity of the heat dissipation through hole 6, and the two heat dissipation outlets 8 are symmetrical, with the outlets 8 located closer to the closed end of the heat dissipation through hole 6.

[0021] In this embodiment: When the independent fan is running, it draws air into the motor. Some of the air enters the heat dissipation hole 6 through the opening of the heat dissipation hole 6 and flows in the heat dissipation hole 6, carrying away the heat on the rotating shaft 4 and discharging it from the heat dissipation outlet 8, thereby preventing the rotating shaft 4 from being in a high-temperature state. Secondly, since the design of the heat dissipation hole 6 will reduce the strength and rigidity of the rotating shaft 4, it is not conducive to the high-speed rotation of the rotating shaft 4. Therefore, multiple end-to-end reinforcing members 7 are set to maintain the rigidity and strength of the rotating shaft 4.

[0022] Multiple staggered 90-degree reinforcing members 7 are all spiral-shaped, which can form a mesh-like support on the inner wall of the rotating shaft 4. This support method has effective support force at any point in the circumferential direction, so as to resist external forces at different angles and thus ensure the rigidity and strength of the rotating shaft 4.

[0023] Furthermore, the multiple staggered 90-degree distributed reinforcing members 7 can distribute the force to other reinforcing members 7, so that each reinforcing member 7 can share part of the force. At the same time, the staggered design can create a more complex force transmission path, which can effectively suppress the torsional deformation of the rotating shaft 4, ensure the torsional resistance of the hollow rotating shaft 4, and thus enhance the overall support force.

[0024] Therefore, the design of this heat dissipation mechanism will not cause a decrease in the strength and rigidity of the rotating shaft 4.

[0025] Please refer to Figure 1 for detailed information. Figure 2 and Figure 3 The coil holder 2 has outwardly protruding limiting parts formed on both sides, which are used to limit the coil 3.

[0026] In this embodiment, the design of the limiting part can restrict the coil 3 to its current position, thus preventing the coil 3 from becoming loose during high-speed rotation.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A DC motor rotor structure, comprising a rotor (1) composed of multiple stacked and fixed silicon steel sheets, characterized in that, A coil seat (2) is installed on the groove of the rotor (1), and a coil (3) is wound around the outer periphery of the coil seat (2). A rotating shaft (4) is interference-fitted at the center hole of the rotor (1). A commutator (5) is assembled at one end of the outer wall of the rotating shaft (4), and a heat dissipation mechanism is installed inside the rotating shaft (4).

2. The DC motor rotor structure according to claim 1, characterized in that, The heat dissipation mechanism includes a heat dissipation through hole (6) located at the center of the inside of the rotating shaft (4). The front end of the heat dissipation through hole (6) is closed, and the rear end of the heat dissipation through hole (6) is open.

3. The DC motor rotor structure according to claim 2, characterized in that, The heat dissipation mechanism also includes a plurality of reinforcing members (7) fixedly welded to the inner wall of the heat dissipation through hole (6). The reinforcing members (7) are in the form of a 180-degree spiral structure, and both ends of one of the reinforcing members (7) are in the form of a planar structure. The plurality of reinforcing members (7) are connected end to end in sequence, and the ends of adjacent reinforcing members (7) are staggered at 90 degrees.

4. The DC motor rotor structure according to claim 3, characterized in that, The heat dissipation mechanism also includes two heat dissipation outlets (8) located at one end of the outer circumference of the rotating shaft (4). The heat dissipation outlets (8) are connected to the inner cavity of the heat dissipation through hole (6), and the heat dissipation outlets (8) are located near the closed end of the heat dissipation through hole (6). The two heat dissipation outlets (8) are symmetrically distributed.

5. The DC motor rotor structure according to claim 1, characterized in that, The coil holder (2) has outwardly protruding limiting parts formed on both sides, which are used to limit the coil (3).

Images