CN210120476U - Novel miniature direct current motor with rectification and overcurrent protection functions - Google Patents

Abstract

The utility model discloses a novel miniature DC motor with both rectification and overcurrent protection, which relates to the technical field of motors and comprises a shell and an end cover, wherein the shell is in a cylindrical shape with an opening, and the end cover covers the opening of the shell; a group of carbon brushes are oppositely and fixedly arranged in the end cover, and each carbon brush is respectively covered with a motor terminal; a circuit board assembly is fixedly arranged outside the end cover, and an overcurrent protector and a rectifier bridge which are electrically connected are integrated on the circuit board assembly; a group of electric contact terminals are fixedly arranged on the end cover, one ends of the electric contact terminals extend out of the end cover and are fixed on the circuit board assembly, the electric contact terminals are connected with the output end of the rectifier bridge, and the other ends of the electric contact terminals are respectively and electrically connected with the two motor terminals; the utility model has the advantages that: the motor can be directly connected with alternating current to work and has an overcurrent protection function, and the volume and the appearance of the motor cannot be changed.

Description

Novel miniature direct current motor with rectification and overcurrent protection functions

Technical Field

The utility model relates to the technical field of electric machines, more specifically the utility model relates to a compromise novel miniature direct current motor of rectification and overcurrent protection.

Background

Household appliances such as a dust collector, an air pump and the like generally work by adopting 110V-240V alternating current, and a common alternating current motor is large in size and heavy in mass; the portable direct current motor is limited in use of a handheld product, does not meet the market requirements of being small and light, and can be widely used in daily work and life to meet the requirements of small-size and light-weight miniature direct current motors.

The existing solution is to integrate a circuit board outside the motor to rectify the alternating current and then connect the rectified alternating current to the micro direct current motor, so a special full-wave rectification circuit and an overcurrent protection circuit must be added outside the motor, a special circuit must be added, the assembly space of the whole product is increased, and the appearance and consistency of the product are affected.

Disclosure of Invention

In order to overcome the not enough of prior art, the utility model provides a compromise rectification and overcurrent protection's novel miniature direct current motor, this motor can directly insert alternating current work and have overcurrent protection function simultaneously to the volume and the outward appearance of motor can not change.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a compromise novel miniature direct current motor of rectification and overcurrent protection, its improvement part lies in: the device comprises a shell and an end cover, wherein the shell is in a cylindrical shape with an opening, and the end cover covers the opening of the shell;

a group of carbon brushes are oppositely and fixedly arranged in the end cover, and each carbon brush is respectively covered with a motor terminal;

a circuit board assembly is fixedly arranged outside the end cover, and an overcurrent protector and a rectifier bridge which are electrically connected are integrated on the circuit board assembly; the end cover is fixedly provided with a group of electric contact terminals, one ends of the electric contact terminals extend out of the end cover and are fixed on the circuit board assembly, the electric contact terminals are connected with the output end of the rectifier bridge, and the other ends of the electric contact terminals are respectively and electrically connected with the two motor terminals.

In the above structure, a return spring is further disposed inside the end cover, one end of the return spring abuts against the inner wall of the end cover, and the other end of the return spring is pressed against the motor terminal.

In the structure, the inner wall of the end cover is provided with a fixed column, and the return spring is sleeved on the fixed column.

In the above structure, the end cap is further provided with a connecting wire inside, and the connecting wire is used for electrically connecting the electric contact terminal and the motor terminal.

In the above structure, the circuit board assembly is fixedly provided with a circuit board terminal, and the circuit board terminal is electrically connected with the overcurrent protector.

In the structure, the overcurrent protector is welded on the circuit board assembly, and the end cover is provided with a through hole for accommodating the overcurrent protector.

In the structure, the novel miniature direct current motor with both rectification and overcurrent protection also comprises a stator magnetic core, a rotor and a central rotating shaft;

the stator magnetic core is fixedly arranged inside the shell, the central rotating shaft penetrates through the center of the rotor, and the central rotating shaft is rotatably arranged on the shell and the end cover, so that the rotor is positioned at the center of the stator magnetic core.

The utility model has the advantages that: the circuit board assembly is provided with a circuit board terminal which is connected with an alternating current output end through the circuit board terminal, the circuit board terminal is connected with an overcurrent protector, the overcurrent protector is a PTC thermistor, the PTC thermistor is electrically connected with a rectifier bridge through the circuit board assembly, and the rectifier bridge is electrically connected with an electric contact terminal through a circuit board; the end cover is internally provided with a connecting wire, the connecting wire is used for realizing the electrical connection between the electric contact terminal and the motor terminal, the motor terminal is conducted with the carbon brush, and the carbon brush can be electrically connected with the commutator inside the shell; through the structure, the motor can be directly connected with alternating current to work and has an overcurrent protection function, the size and the appearance of the motor cannot be changed, and the consistency of the appearance of the motor is ensured.

Drawings

Fig. 1 is the utility model discloses a compromise novel miniature dc motor's of rectification and overcurrent protection spatial structure sketch map.

Fig. 2 is the utility model discloses a compromise novel miniature dc motor's of rectification and overcurrent protection internal structure schematic diagram.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. The utility model discloses each technical feature in the creation can the interactive combination under the prerequisite that does not contradict conflict each other.

Referring to fig. 1 and 2, the present invention discloses a novel miniature dc motor with both rectification and overcurrent protection, specifically, in this embodiment, the motor includes a housing 10 and an end cap 20, the housing 10 is in a cylindrical shape with an opening, and the end cap 20 covers the opening of the housing 10; as shown in fig. 2, a set of carbon brushes 201 are oppositely and fixedly disposed inside the end cap 20, and each carbon brush 201 is covered with a motor terminal 202; further, a circuit board assembly 203 is fixedly arranged outside the end cover 20, an overcurrent protector 206 and a rectifier bridge which are electrically connected are integrated on the circuit board assembly 203, and a power line 204 is connected on the circuit board assembly 203; a set of electrical contact terminals 205 is fixedly disposed on the end cover 20, one end of the electrical contact terminal 205 extends from the end cover 20 and is fixed on the circuit board assembly 203, the electrical contact terminal 205 is connected with the output end of the rectifier bridge, and the other end of the electrical contact terminal 205 is electrically connected with the two motor terminals 202 respectively.

In addition, the circuit board assembly 203 is provided with a circuit board terminal 207, the circuit board terminal 207 is connected with an alternating current output end through the circuit board terminal 207, the circuit board terminal 207 is connected with the overcurrent protector 206, the overcurrent protector 206 is welded on the circuit board assembly 203, and the end cover 20 is provided with a through hole for accommodating the overcurrent protector 206. In this embodiment, the over-current protector 206 is a PTC thermistor, the PTC thermistor is electrically connected to a rectifier bridge through a circuit board assembly 203, and the rectifier bridge is electrically connected to the electrical contact terminal 205 through a circuit board; in this embodiment, a connection wire 208 is further disposed inside the end cap 20, the connection wire 208 is used for electrically connecting the electrical contact terminal 205 with the motor terminal 202, the motor terminal 202 is electrically connected with the carbon brush 201, and the carbon brush 201 can be electrically connected with the commutator inside the housing 10. Therefore, through the design of the structure, the motor can be directly connected with alternating current to work and has an overcurrent protection function, the size and the appearance of the motor cannot be changed, and the consistency of the appearance of the motor is ensured.

As a preferred embodiment, a return spring 209 is further disposed inside the end cap 20, one end of the return spring 209 abuts against an inner wall of the end cap 20, the other end of the return spring 209 is pressed against the motor terminal 202, a fixing post 210 is disposed on the inner wall of the end cap 20, and the return spring 209 is sleeved on the fixing post 210.

In the above embodiment, the novel miniature dc motor with both rectification and overcurrent protection further includes a stator core (not labeled in the figure), a rotor (not labeled in the figure), and a central rotating shaft 30; the stator magnetic core is fixedly arranged in the shell 10, the central rotating shaft penetrates through the center of the rotor, and the central rotating shaft is rotatably arranged on the shell 10 and the end cover 20, so that the rotor is positioned at the center of the stator magnetic core.

While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.

Claims (7)

1. The utility model provides a compromise novel miniature direct current motor of rectification and overcurrent protection which characterized in that: the device comprises a shell and an end cover, wherein the shell is in a cylindrical shape with an opening, and the end cover covers the opening of the shell;

a group of carbon brushes are oppositely and fixedly arranged in the end cover, and each carbon brush is respectively covered with a motor terminal;

a circuit board assembly is fixedly arranged outside the end cover, and an overcurrent protector and a rectifier bridge which are electrically connected are integrated on the circuit board assembly; the end cover is fixedly provided with a group of electric contact terminals, one ends of the electric contact terminals extend out of the end cover and are fixed on the circuit board assembly, the electric contact terminals are connected with the output end of the rectifier bridge, and the other ends of the electric contact terminals are respectively and electrically connected with the two motor terminals.

2. The novel miniature direct current motor with both rectification and overcurrent protection as set forth in claim 1, wherein: and a return spring is also arranged in the end cover, one end of the return spring is propped against the inner wall of the end cover, and the other end of the return spring is tightly pressed on the motor terminal.

3. The novel miniature direct current motor with both rectification and overcurrent protection as set forth in claim 2, wherein: the inner wall of the end cover is provided with a fixed column, and the return spring is sleeved on the fixed column.

4. The novel miniature direct current motor with both rectification and overcurrent protection as set forth in claim 1, wherein: and a connecting wire is also arranged in the end cover and used for realizing the electric connection between the electric contact terminal and the motor terminal.

5. The novel miniature direct current motor with both rectification and overcurrent protection as set forth in claim 1, wherein: the circuit board assembly is fixedly provided with a circuit board terminal, and the circuit board terminal is electrically connected with the overcurrent protector.

6. The novel miniature direct current motor with both rectification and overcurrent protection as set forth in claim 1 or 5, wherein: the overcurrent protector is welded on the circuit board assembly, and a through hole for accommodating the overcurrent protector is formed in the end cover.

7. The novel miniature direct current motor with both rectification and overcurrent protection as set forth in claim 1, wherein: the novel miniature direct current motor with both rectification and overcurrent protection also comprises a stator magnetic core, a rotor and a central rotating shaft;

the stator magnetic core is fixedly arranged inside the shell, the central rotating shaft penetrates through the center of the rotor, and the central rotating shaft is rotatably arranged on the shell and the end cover, so that the rotor is positioned at the center of the stator magnetic core.

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