Efficient machining type hollow cup motor

Abstract

The utility model discloses a high-efficiency machining type hollow-core cup motor, which comprises a shell, a coreless rotor assembly and an electric brush assembly, the coreless rotor assembly is rotatably arranged in the shell, and the electric brush assembly is arranged in the shell; the coreless rotor assembly comprises a main shaft, a hollow coil, a coil support and an upper end cover, the upper end cover covers an upper opening of the shell, the bottom of the upper end cover is provided with a sleeve shaft extending towards the interior of the shell, the magnet is fixedly arranged on the sleeve shaft, and the middle of the upper end cover is provided with a shaft hole penetrating through the sleeve shaft. The hollow coil is fixedly arranged on the periphery of the coil support, and the lower end of the main shaft is fixedly arranged on the coil support and rotationally connected with the shaft hole. According to the utility model, the coreless rotor assembly adopts a modular design, so that the assembly process is reduced, the assembly of the motor is more convenient, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of micro motors, and particularly relates to a high-efficiency machining type hollow cup motor. Background Art

[0002] In recent years, due to the characteristics of small volume, light weight, high motor efficiency and low power consumption, the micro DC hollow cup micro motor has been widely used in model airplanes and toy remote control airplanes.

[0003] At present, the hollow cup micro motors produced on the market generally include a housing, a front end cover, a rear end cover, a hollow cup-shaped rotor, and a stator arranged in the middle of the housing. The front end cover and the rear end cover are covered on the housing. A power connector is arranged on the outer side surface of the rear end cover, and a brush connected to the power connector is arranged on the inner side surface of the rear end cover. The hollow cup-shaped rotor includes a rotating shaft, a hollow cup coil winding and a commutator. The commutator is installed at the rear end of the rotating shaft. One end of the hollow cup coil is adhered to the turntable of the commutator of the rotor and is outside the rotating shaft. The front end cover is fixedly provided with a bushing for installing the stator. The rotating shaft is rotatably installed in the bushing, and the stator is located in the inner cavity of the hollow cup coil winding. This structure not only increases the components of the motor, makes the assembly more cumbersome, and increases the production cost, but also increases the assembly stations on the production line, greatly reducing the production efficiency. At the same time, the traditional brush acts on the commutator, and during the rotation of the hollow cup-shaped rotor, the brush is prone to vibration, which easily causes large commutation sparks in the motor and shortens the service life of the brush. Summary of the Utility Model

[0004] The technical problem to be solved by the embodiments of the utility model is to provide a high-efficiency machining type hollow cup motor, the non-core rotor assembly of which adopts a modular design, reduces the assembly process, makes the assembly of the motor more convenient, and is beneficial to improving the production efficiency.

[0005] To achieve the above object, the utility model discloses a high-efficiency machining type hollow cup motor, which includes a housing, a non-core rotor assembly, and a brush assembly. The non-core rotor assembly is rotatably arranged in the housing, and the brush assembly is arranged in the housing;

[0006] The non-core rotor assembly includes a main shaft, a hollow coil, a coil bracket, and an upper end cover. The upper end cover covers the upper opening of the housing. The bottom of the upper end cover has a sleeve shaft extending towards the inside of the housing. A magnet is fixedly arranged on the sleeve shaft. The middle part of the upper end cover has a shaft hole penetrating through the sleeve shaft. The hollow coil is fixedly arranged on the outer periphery of the coil bracket. The lower end of the main shaft is fixedly arranged on the coil bracket and is rotationally connected to the shaft hole. A commutator is arranged at the bottom of the coil bracket. The brush assembly is electrically connected to the commutator;

[0007] The brush assembly includes a first brush piece and a second brush piece. The first brush piece and the second brush piece are arranged at the lower end of the housing. Under the action of elasticity, the first brush piece and the second brush piece respectively abut against the peripheral wall of the commutator, and damping blocks are respectively arranged on the first brush piece and the second brush piece.

[0008] Furthermore, a lower end cover is provided at the lower end of the housing. A first slot and a second slot are provided on the lower end cover. The end of the first brush piece is inserted into the first slot, and the end of the second brush piece is inserted into the second slot.

[0009] Furthermore, the bottom surface of the lower end cover respectively has jacks communicating with the first slot and the second slot. Contact pieces are inserted into the jacks. The contact pieces abut against the first brush piece and the second brush piece, and the lower ends of the contact pieces extend outwards and are electrically connected to an external power supply.

[0010] Furthermore, stop triangular blocks protruding outwards are respectively arranged on both sides of the contact piece, so that the stop triangular blocks of the contact piece are in stop cooperation with the openings of the jacks.

[0011] Furthermore, a reinforcing block is arranged on the inner side surface of the contact piece, and the reinforcing block abuts against the bottom surface of the lower end cover.

[0012] Furthermore, the bottom of the coil bracket has a central axis rotatably connected to the lower end cover, and the commutator is fixedly arranged on the central axis.

[0013] Furthermore, a protruding portion protruding upwards is arranged on the top surface of the coil bracket, and the protruding portion abuts against the bottom surface of the sleeve shaft.

[0014] Furthermore, a sunk groove is arranged on the inner wall of the upper opening of the housing. The height of the sunk groove is the same as the thickness of the upper end cover, and the upper end cover is arranged in the sunk groove.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] (1) In the present utility model, a modular design is formed among the upper end cover, the main shaft, the stator and the hollow coil, thereby reducing the motor assembly process, making the motor assembly more convenient, and greatly improving the production efficiency. (2) Damping blocks are arranged on the first brush piece and the second brush piece, which not only increases the strength of the brush piece, but also reduces the vibration of the brush assembly, ensures the stability of the motor operation, and can effectively reduce the noise generated during the motor operation. (3) A reinforcing block is arranged on the contact piece, thereby greatly improving the strength of the contact piece and making it not easy to deform. Description of the Drawings

[0017] Figure 1 Schematic diagram I of the overall structure of the present utility model;

[0018] Figure 2 Half-sectional view of the overall structure of the present utility model;

[0019] Figure 3 Schematic diagram of the structure of the brush assembly and the commutator;

[0020] Figure 4 Schematic diagram of the overall structure of the brush assembly;

[0021] Figure 5 Schematic diagram II of the overall structure of the present utility model;

[0022] Figure 6 Shown as Figure 5 Schematic diagram of the structure of part A in Specific embodiments

[0023] To make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] Referring to Figure 1 、 Figure 2 As shown, a high-efficiency machining type hollow cup motor includes a housing 1, a coreless rotor assembly 2, and a brush assembly 3. The coreless rotor assembly 2 is rotatably arranged in the housing 1, and the brush assembly 3 is arranged in the housing 1. The coreless rotor assembly 2 includes a main shaft 21, a hollow coil 22, a coil bracket 24, and an upper end cover 25. The upper end cover 25 is covered on the upper opening of the housing 1. A sink is provided on the inner wall of the upper opening of the housing 1, and the height of the sink is the same as the thickness of the upper end cover 25. The upper end cover 25 is covered in the sink. The bottom of the upper end cover 25 has a sleeve shaft 251 extending towards the inside of the housing 1. A magnet 23 is fixedly arranged on the sleeve shaft 251. In this embodiment, the magnet 23 is preferably a permanent magnet. A shaft hole 252 penetrating the sleeve shaft 251 is provided in the middle of the upper end cover 25. The hollow coil 22 is fixedly arranged on the outer periphery of the coil bracket 24. The lower end of the main shaft 21 is fixedly arranged on the coil bracket 24, and the head and tail ends of the main shaft 21 are rotatably connected to the shaft hole 252 through bearings. In this embodiment, the inner diameter of the hollow coil 22 is larger than the outer diameter of the magnet 23, so as to form a magnetic field channel between the hollow coil 22 and the magnet 23, so that the coreless rotor assembly 2 forms a modular design, making the assembly of the motor more convenient. The brush assembly 3 is arranged at the bottom of the housing. A commutator 241 is fixedly arranged at the bottom of the coil bracket 24. The brush assembly 3 is externally connected to an external power supply, so that the brush assembly 3 applies an external current to the commutator 241.

[0025] Referring to Figure 2As shown, further, the top surface of the coil bracket 24 has a protruding portion that protrudes upward. The protruding portion abuts against the bottom surface of the sleeve shaft 251, so that a gap is formed between the coil bracket 24 and the end face of the magnet 23, avoiding friction between the coil bracket 24 and the end face of the magnet 23 during rotation, and greatly improving the service life of the motor.

[0026] Referring to Figures 2-4 As shown, specifically, the lower opening of the housing 1 is covered with a lower end cover 4. The bottom of the coil bracket 24 has a central shaft rotatably connected to the lower end cover 4. The commutator 241 is fixedly arranged on the central shaft. The brush assembly 3 includes a first brush piece 31 and a second brush piece 32. The first brush piece 31 and the second brush piece 32 are fixedly arranged on the lower end cover 4. In this embodiment, the first brush piece 31 and the second brush piece 32 are bent at 90°. Among them, a first slot 41 and a second slot 42 are arranged on the lower end cover 4. The end of the first brush piece 31 is inserted into the first slot 41, and the end of the second brush piece 32 is inserted into the second slot 42, so that the first brush piece 31 and the second brush piece 32 respectively abut against the peripheral wall of the commutator 241 under their own elastic action.

[0027] Referring to Figure 3 As shown, in this embodiment, damping blocks 33 are respectively arranged on the surfaces of the first brush piece 31 and the second brush piece 32. In this embodiment, the damping blocks 33 are preferably made of viscoelastic materials, which not only enhance the strength of the first brush piece and the second brush piece, but also reduce the vibration of the first brush piece and the second brush piece, thereby avoiding the situation that the first brush piece 31 and the second brush piece 32 shake or jump due to the rotation of the commutator 241, ensuring that the first brush piece 31 and the second brush piece 32 can better adhere to the peripheral wall of the commutator 241, ensuring the stability of the motor operation, and effectively reducing the noise generated during the operation of the motor.

[0028] Referring to Figure 5 、 Figure 6 As shown, further, the bottom surface of the lower end cover 4 respectively has insertion holes communicating with the first slot 41 and the second slot 42. Contact pieces 43 are inserted into the insertion holes. The contact pieces 43 abut against the first brush piece 31 and the second brush piece 32, and the lower ends of the contact pieces 43 extend outward and are electrically connected to an external power source, so that the contact pieces 43 conduct the current of the external power source to the first brush piece 31 and the second brush piece 32.

[0029] More preferably, the two sides of the contact piece 43 respectively have outwardly protruding stop triangular blocks 431, so that the stop triangular blocks 431 of the contact piece are in stop fit with the opening of the insertion hole. A reinforcing block 432 is arranged on the inner side surface of the contact piece 43. The reinforcing block 432 abuts against the bottom surface of the lower end cover 4. At the same time, the surface strength of the contact piece 43 is increased by using the reinforcing block 432, so that the contact piece 43 is not easily deformed.

[0030] Referring to Figures 1-6 As shown, during specific operation, by turning on an external power supply, current is transmitted through the contact piece to the first brush piece 31 and the second brush piece 32, and the current is applied to the commutator through the first brush piece 31 and the second brush piece 32, so that an electromagnetic field is generated by the interaction between the current flowing in the hollow coil 22 and the magnet 23, causing the hollow coil 22 to drive the main shaft to rotate.

[0031] Of course, the above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those familiar with this technology to understand the content of the present invention and implement it accordingly. It should not be used to limit the protection scope of the present invention. All modifications made according to the spirit and essence of the main technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

1. An efficient machining type coreless cup motor, characterized in that, It includes a housing (1), a coreless rotor assembly (2), and a brush assembly (3). The coreless rotor assembly (2) is rotatably arranged inside the housing (1), and the brush assembly (3) is arranged inside the housing (1). The coreless rotor assembly (2) includes a main shaft (21), a hollow coil (22), a coil bracket (24), and an upper end cover (25). The upper end cover (25) covers the upper opening of the housing (1). The bottom of the upper end cover (25) has a sleeve shaft (251) extending towards the inside of the housing (1). A magnet (23) is fixedly arranged on the sleeve shaft (251). The middle part of the upper end cover (25) has a shaft hole (252) penetrating through the sleeve shaft (251). The hollow coil (22) is fixedly arranged on the outer periphery of the coil bracket (24). The lower end of the main shaft (21) is fixedly arranged on the coil bracket (24) and is rotatably connected to the shaft hole (252). A commutator (241) is arranged at the bottom of the coil bracket (24). The brush assembly (3) is electrically connected to the commutator (241). The brush assembly (3) includes a first brush piece (31) and a second brush piece (32). The first brush piece (31) and the second brush piece (32) are arranged at the lower end of the housing (1). The first brush piece (31) and the second brush piece (32) are respectively in contact with the peripheral wall of the commutator (241) under the action of elasticity, and damping blocks (33) are respectively arranged on the first brush piece (31) and the second brush piece (32).

2. The high-efficiency machining type coreless cup motor according to claim 1, wherein A lower end cover (4) is provided at the lower end of the housing (1). The lower end cover (4) is provided with a first slot (41) and a second slot (42). The end of the first brush piece (31) is inserted into the first slot (41), and the end of the second brush piece (32) is inserted into the second slot (42).

3. An efficient machining type cup motor according to claim 2, characterized in that, The bottom surface of the lower end cover (4) respectively has insertion holes communicating with the first slot (41) and the second slot (42). Contact pieces (43) are inserted into the insertion holes. The contact pieces (43) are in contact with the first brush piece (31) and the second brush piece (32), and the lower ends of the contact pieces (43) extend outwards and are electrically connected to an external power supply.

4. An efficient machining type cup rotor motor according to claim 3, characterized in that, Stop triangular blocks (431) protruding outwards are respectively arranged on both sides of the contact piece (43) so that the stop triangular blocks (431) of the contact piece (43) are in stop cooperation with the openings of the insertion holes.

5. An efficient machining type cup rotor motor according to claim 3, characterized in that, Reinforcing blocks (432) are arranged on the inner side surface of the contact piece (43). The reinforcing blocks (432) are in contact with the bottom surface of the lower end cover (4).

6. An efficient machining type coreless cup motor according to claim 2, characterized in that, The bottom of the coil bracket (24) has a central shaft rotatably connected to the lower end cover (4). The commutator (241) is fixedly arranged on the central shaft.

7. An efficient machining type coreless cup motor according to claim 1, characterized in that, The top surface of the coil bracket (24) has a protruding portion protruding upwards. The protruding portion is in contact with the bottom surface of the sleeve shaft (251).

8. An efficient machining type coreless cup motor according to claim 1, characterized in that, The inner wall of the upper opening of the housing (1) is provided with a sunk groove, the height of the sunk groove is the same as the thickness of the upper end cover (25), and the upper end cover (25) is covered in the sunk groove.

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