Small direct current motor

Abstract

The utility model provides a miniature direct current motor, which relates to the technical field of electric motors and comprises a casing and a power mechanism, and the power mechanism is mounted in the casing and comprises an electric brush assembly, a reversing assembly, an armature assembly and a magnetic pole assembly. The electric brush assembly can be in contact with the commutation assembly so as to help the motor to realize commutation, the commutation assembly controls the flow direction of current so as to change the rotation direction of the motor and enable the device to operate normally, the armature assembly is a rotation part of the device and can conduct a magnetic field, rotate and provide power for the device, and the magnetic pole assembly is used for generating the magnetic field. The protection assembly can interact with a magnetic field generated by the armature assembly so as to drive the device to operate, the heat dissipation assembly can help the device to cool so as to ensure that the device cannot be overheated to cause faults during operation, and the protection assembly can automatically cut off a power supply when the current is too large so as to prevent the device from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of electric motors, in particular to a small DC motor. Background Art

[0002] Small DC motors are widely used in various electronic devices and play a key role in many applications. They can be used to provide mechanical power, control motion, achieve vibration, automatic control and various other specific functions. Small DC motors play a key role in many different applications, from providing power to achieving precise control to providing vibration and auxiliary functions. The diversity of their roles makes them an indispensable part of many small electronic devices and mechanical devices.

[0003] After searching, the patent number "CN207926312U" mentioned in the text that "the utility model discloses a small DC motor, including a casing, a rotor assembly, and a second positioning ring, a second meson, a bearing, a first meson and a first positioning ring sequentially mounted on one end of the rotor assembly, the rotor assembly is located in the casing, one end of the rotor assembly passes through the casing, the bearing is engaged in the casing, the second positioning ring is located in the casing, the first meson is located in the casing, the first meson fits the first positioning ring and the bearing, and the second meson fits the bearing and the second positioning ring. A small DC motor of the utility model can reduce the error of virtual position, does not require too many adjustment components, reduces the impact of working hours and reduces the defective rate". When in use, through the design of the positioning ring, there is no need for too many adjustment components, which can reduce the error of virtual position and thus reduce the defective rate. However, the device cannot cool the device when in use, which will cause the motor to overheat and malfunction. The device cannot protect the parts when the current is too large, thereby causing damage to the parts.

[0004] Therefore, we provide a small DC motor to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a small DC motor to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a small DC motor, comprising a housing and a power mechanism, wherein the power mechanism is installed inside the housing;

[0007] The power mechanism includes a brush assembly, a commutation assembly, an armature assembly and a magnetic pole assembly. The brush assembly is installed inside the housing, the commutation assembly is arranged on the inner side of the brush assembly, one side of the commutation assembly is electrically connected to the armature assembly, and the magnetic pole assembly is installed on the outer side of the armature assembly.

[0008] Preferably, the brush assembly comprises a fixing frame, a pressure rod and a brush device, the fixing frame is fixedly connected to the inside of the housing, a pressure rod is provided on one side of the fixing frame, and a brush device is installed on the outside of the pressure rod.

[0009] Preferably, the reversing assembly comprises a commutator and a main shaft, the commutator is installed on the inner side of the fixing frame, and the inner side of the commutator is rotatably connected to the main shaft.

[0010] Preferably, the armature assembly comprises a rotor winding and a rotor core, the rotor winding is provided on one side of the commutator, and the rotor core is fixedly connected to the outer side of the rotor winding.

[0011] Preferably, in the small DC motor, the magnetic pole assembly includes a main magnetic pole and a magnetic pole winding, the inner wall of the casing is provided with the main magnetic pole, and the outer side of the main magnetic pole is wound with a magnetic pole winding.

[0012] Preferably, a heat dissipation assembly is provided on one side of the magnetic pole assembly, the heat dissipation assembly includes a fan and a dustproof net, a fan is provided on one side of the main magnetic pole, and a dustproof net is provided on the outer side of the fan.

[0013] Preferably, the bottom end of the inner wall of the casing is electrically connected to a protection component, the protection component includes a current protector and a protection element, the bottom end of the inner wall of the casing is electrically connected to the current protector, and a protection element is installed on one side of the current protector.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The setting of the heat dissipation component can help the device to cool down to ensure that the device will not overheat and cause malfunction during operation. The protection component can automatically disconnect the power supply when the current is too large to prevent the device from being damaged.

[0016] 2. The brush assembly can contact the commutation assembly to help the motor achieve commutation. The commutation assembly changes the direction of rotation of the motor by controlling the flow of current, so that the device can operate normally. The armature assembly is the rotating part of the device, which can conduct the magnetic field and rotate to provide power for the device. The pole assembly is used to generate a magnetic field and can interact with the magnetic field generated by the armature assembly to drive the device to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall appearance structure of the utility model;

[0018] Figure 2 It is a schematic diagram of the overall internal structure of the utility model;

[0019] Figure 3This is a schematic diagram of the power mechanism structure of the utility model;

[0020] Figure 4 It is a schematic diagram of the overall cross-sectional structure of the utility model.

[0021] Numbers in the figure: 1. casing; 2. power mechanism; 21. brush assembly; 211. fixing frame; 213. brush device; 212. pressure rod; 22. commutation assembly; 221. commutator; 222. main shaft; 23. armature assembly; 231. rotor winding; 232. rotor core; 24. pole assembly; 241. main pole; 242. pole winding; 3. heat dissipation assembly; 31. fan; 32. dust net; 4. protection assembly; 41. current protector; 42. protection element. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Embodiment 1

[0024] See also Figure 1-4 As shown, the utility model provides a technical solution: a small DC motor, comprising a housing 1 and a power mechanism 2, wherein the power mechanism 2 is installed inside the housing 1;

[0025] The power mechanism 2 includes a brush assembly 21, a commutation assembly 22, an armature assembly 23 and a magnetic pole assembly 24. The brush assembly 21 is installed inside the casing 1, the commutation assembly 22 is arranged on the inner side of the brush assembly 21, one side of the commutation assembly 22 is electrically connected to the armature assembly 23, and the magnetic pole assembly 24 is installed on the outer side of the armature assembly 23.

[0026] Furthermore, the brush assembly 21 includes a fixing frame 211, a pressure rod 212 and a brush device 213. The fixing frame 211 is fixedly connected to the inside of the casing 1, a pressure rod 212 is provided on one side of the fixing frame 211, and a brush device 213 is installed on the outside of the pressure rod 212. The brush assembly 21 can contact the commutation assembly 22, thereby helping the motor to achieve commutation.

[0027] Furthermore, the commutation assembly 22 includes a commutator 221 and a main shaft 222. The commutator 221 is installed on the inner side of the fixed frame 211, and the inner side of the commutator 221 is rotatably connected to the main shaft 222. The commutation assembly 22 can control the flow direction of current, thereby changing the rotation direction of the motor so that the device can operate normally.

[0028] Furthermore, the armature assembly 23 includes a rotor winding 231 and a rotor core 232. The rotor winding 231 is provided on one side of the commutator 221, and the rotor core 232 is fixedly connected to the outer side of the rotor winding 231. The armature assembly 23 is the rotating part of the device, which can conduct the magnetic field and rotate.

[0029] Furthermore, the pole assembly 24 includes a main pole 241 and a pole winding 242. The inner wall of the casing 1 is provided with the main pole 241, and the outer side of the main pole 241 is wound with the pole winding 242. The pole assembly 24 is used to generate a magnetic field, which can interact with the magnetic field generated by the armature assembly 23, thereby driving the device to operate.

[0030] Embodiment 2

[0031] See also Figure 1-4 As shown, in contrast to Example 1, as another implementation of the utility model, a heat dissipation assembly 3 is provided on one side of the magnetic pole assembly 24, and the heat dissipation assembly 3 includes a fan 31 and a dustproof net 32. A fan 31 is provided on one side of the main magnetic pole 241, and a dustproof net 32 ​​is provided on the outer side of the fan 31. The heat dissipation assembly 3 can help cool the device to ensure that the device does not overheat during operation and cause malfunction.

[0032] Furthermore, the bottom end of the inner wall of the casing 1 is electrically connected to a protective component 4, which includes a current protector 41 and a protective element 42. The bottom end of the inner wall of the casing 1 is electrically connected to the current protector 41, and a protective element 42 is installed on one side of the current protector 41. The protective component 4 can automatically disconnect the power supply when the current is too large, thereby preventing the device from being damaged.

[0033] Working principle: First, a small DC motor is moved to the working position. When in use, the first step is that the user first connects the power supply to the power supply end of the device to provide current to the device. The second step is that the current enters the armature assembly 23 of the motor from the power supply, and the current generates a magnetic field through the wire, so that the wire in the rotor winding 231 forms a circular loop of the magnetic field. The magnetic field generated by the armature assembly 23 interacts with the pole assembly 24 to generate torque, and the magnetic field causes the armature assembly 23 to start rotating. The third step is that the brush assembly 21 draws out a DC current and then slides on the commutator 221, so that a rotating magnetic field that attracts the static magnetic field of the armature assembly 23 can be generated. At the same time, the commutator 221 makes the direction of the electromagnetic torque constant, so that the armature assembly 23 rotates continuously. The fourth step is that the armature assembly 23 drives the fan 31 to rotate for heat dissipation, so that the device can maintain normal operation, thus completing the use process of a small DC motor.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A small DC motor, comprising a housing (1) and a power mechanism (2), characterized in that: A power mechanism (2) is installed inside the casing (1); The power mechanism (2) comprises a brush assembly (21), a commutation assembly (22), an armature assembly (23) and a magnetic pole assembly (24); the brush assembly (21) is installed inside the housing (1); the commutation assembly (22) is arranged on the inner side of the brush assembly (21); one side of the commutation assembly (22) is electrically connected to the armature assembly (23); and the magnetic pole assembly (24) is installed on the outer side of the armature assembly (23).

2. A small DC motor according to claim 1, characterized in that: The brush assembly (21) comprises a fixing frame (211), a pressure rod (212) and a brush device (213); the fixing frame (211) is fixedly connected to the inside of the housing (1); a pressure rod (212) is arranged on one side of the fixing frame (211); and a brush device (213) is installed on the outside of the pressure rod (212).

3. A small DC motor according to claim 2, characterized in that: The reversing assembly (22) comprises a commutator (221) and a main shaft (222); the commutator (221) is installed on the inner side of the fixing frame (211); and the inner side of the commutator (221) is rotatably connected to the main shaft (222).

4. A small DC motor according to claim 3, characterized in that: The armature assembly (23) comprises a rotor winding (231) and a rotor core (232); the rotor winding (231) is provided on one side of the commutator (221); and the rotor core (232) is fixedly connected to the outer side of the rotor winding (231).

5. A small DC motor according to claim 1, characterized in that: The magnetic pole assembly (24) comprises a main magnetic pole (241) and a magnetic pole winding (242); the inner wall of the housing (1) is provided with the main magnetic pole (241), and the outer side of the main magnetic pole (241) is wound with the magnetic pole winding (242).

6. A small DC motor according to claim 5, characterized in that: A heat dissipation component (3) is provided on one side of the magnetic pole component (24), and the heat dissipation component (3) comprises a fan (31) and a dustproof net (32); a fan (31) is provided on one side of the main magnetic pole (241), and a dustproof net (32) is provided on the outer side of the fan (31).

7. A small DC motor according to claim 1, characterized in that: The bottom end of the inner wall of the casing (1) is electrically connected to a protection component (4), the protection component (4) comprising a current protector (41) and a protection element (42), the bottom end of the inner wall of the casing (1) is electrically connected to the current protector (41), and the protection element (42) is installed on one side of the current protector (41).

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