A fixed structure built into a protector and a motor

Abstract

The present invention relates to a built-in fixing structure for a protector, which comprises a mounting seat arranged inside a motor housing. The mounting seat is provided with a protector fixing member, a first wiring terminal and a second wiring terminal. The protector fixing member is arranged close to the stator winding of the motor and is located at the air inlet position of the motor air duct. The first wiring terminal comprises a stator winding connection part and a first protector connection part. The second wiring terminal comprises a carbon brush connection part and a second protector connection part. In the present invention, the protector can be installed at a position close to the stator winding through the protector fixing member on the mounting seat, so that even when the motor operates at a low air volume, the temperature of the stator can still be quickly and effectively sensed, and the induction sensitivity of the protector is improved, thereby better protecting the motor. The mounting seat has a larger mounting space for fixing the protector, can better adapt to protectors of different specifications and sizes, has little limitation on the use of the protector, and is of great significance for the overall cost control of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of the installation of motor protectors, and particularly relates to a built-in fixing structure for a protector and a motor. Background Art

[0002] The protector of a motor usually refers to a temperature protector. The protectors of existing dust collection charging base motors are usually arranged below the motor air duct, and there are mainly two installation methods. One is to install it on the side of the stator winding inside the motor housing, and the other is to install it outside the motor housing. For the first installation method, due to the limited space inside the housing, the model and size of the protector are restricted. For the second installation method, it will cause the overall size of the motor to become larger, and the distance between the protector and the stator winding is relatively large, resulting in a longer time for heat conduction through the wind. In addition, when the motor runs at a low air volume (the air inlet is blocked by dust or overloaded), less heat is conducted by the wind, and the tripping time (response time) of the protector becomes longer, with great limitations. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a built-in fixing structure for a protector and a motor, which can improve the induction sensitivity of the protector when the motor runs at a low air volume, better protect the motor, and at the same time, can adapt to the installation of various protectors with little restriction on the protector specifications.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] A built-in fixing structure for a protector, which includes a mounting seat arranged inside the motor housing, and the mounting seat is provided with a protector fixing member, a first wiring terminal, and a second wiring terminal;

[0006] The protector fixing member is arranged close to the stator winding of the motor and is located at the air inlet position of the motor air duct;

[0007] The first wiring terminal includes a stator winding connection part connected to the stator winding and a first protector connection part connected to one of the power leads of the protector; the second wiring terminal includes a carbon brush connection part connected to the carbon brush and a second protector connection part connected to the other power lead of the protector; through the first wiring terminal and the second wiring terminal, the stator winding, the protector, and the carbon brush are connected in series in sequence to form a loop.

[0008] Preferably, the protector fixing member includes a first fixing part, a second fixing part, and a third fixing part connected in sequence; the protector fixing member is integrally formed with the mounting seat, and the first fixing part, the second fixing part, the third fixing part, and the mounting seat cooperate to enclose a placement space for the protector.

[0009] Preferably, the second fixing part has at least one opening.

[0010] Preferably, both the first protector connection part and the second protector connection part have terminal clamping grooves or riveting openings.

[0011] Preferably, the stator winding connection part includes a base and a contact part integrally formed with the base. The contact part is bent and placed above the base. The stator winding has a stator winding lead-out terminal that cooperates with the contact part. The carbon brush connection part has a welding processing surface, and the carbon brush connection part is connected to the carbon brush through a copper wire.

[0012] Preferably, at least one card slot and at least one slot are provided on the mounting base. The first wiring terminal is provided with an elastic clamping part and a first bending stop part that cooperate with the card slot. The second wiring terminal is provided with a plug part and a second bending stop part that cooperate with the slot.

[0013] Preferably, two fixing platforms for fixing the power lead of the protector are provided on the mounting base, and the two fixing platforms are respectively arranged close to the first protector connection part and the second protector connection part.

[0014] Preferably, the mounting base is made of BMC resin.

[0015] The present invention also discloses a motor including a protector built-in fixing structure as described in any one of the above. The motor includes a motor housing, a motor cover, a stator, a rotor, a carbon brush, and a protector. The mounting base is arranged between the motor housing and the motor cover. The protector is fixed in the protector fixing part.

[0016] Preferably, a carbon brush mounting groove is provided on the mounting base, and the carbon brush is mounted in the carbon brush mounting groove.

[0017] After adopting the above scheme, in the present invention, the stator winding, the protector, and the carbon brush are sequentially connected in series to form a loop through the first wiring terminal and the second wiring terminal. The protector can be installed at a position close to the stator winding through the protector fixing part on the mounting base. Even when the motor operates at a low air volume, the temperature of the stator can still be quickly and effectively sensed, and the induction sensitivity of the protector is improved, thereby better protecting the motor. The mounting base is arranged inside the motor housing and does not affect the overall external dimensions of the motor. The mounting base has a larger mounting space for fixing the protector, can better adapt to protectors of different specifications and sizes, has little restriction on the use of the protector, and is of great significance for the overall cost control of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the protector built-in fixing structure;

[0019] Figure 2 It is a schematic diagram of the first wiring terminal;

[0020] Figure 3 Schematic diagram of another perspective of the first terminal;

[0021] Figure 4 Installation schematic diagram of the first terminal and the second terminal on the mounting base;

[0022] Figure 5 Schematic diagram of the second terminal;

[0023] Figure 6 Installation schematic diagram of the second terminal on the mounting base in another perspective;

[0024] Figure 7 Schematic diagram of the motor of the present invention (part of the housing removed);

[0025] Figure 8 For Figure 7 Enlarged schematic diagram at position A in

[0026] Label description:

[0027] Mounting base 10, protector fixing part 11, first fixing part 111, second fixing part 112, third fixing part 113, opening 114, card slot 12, slot 13, fixing table 14, carbon brush mounting groove 15;

[0028] First terminal 20, stator winding connection part 21, base 211, contact part 212, elastic clamping part 22, first bending stop part 23, first protector connection part 24, riveting interface 241;

[0029] Second terminal 30, carbon brush connection part 31, welding processing surface 311, copper wire 312, plug part 32, second bending stop part 33, second protector connection part 34, riveting interface 341;

[0030] Protector 40, power supply lead 41;

[0031] Carbon brush 50;

[0032] Housing 60;

[0033] Machine cover 70;

[0034] Stator 80, stator winding lead-out terminal 81;

[0035] Rotor 90. Detailed implementation mode

[0036] As Figure 1As shown, the present invention discloses a built-in fixing structure of a protector, which includes a mounting seat 10 arranged in the motor housing. The mounting seat 10 is made of BMC resin material, has the advantages of high mechanical strength, good insulation performance, and light weight, can avoid short circuits between necessary electrical connections, and reduce the impact of the mounting seat on the overall weight of the motor. A protector fixing member 11, a card slot 12, two slots 13, two fixing platforms 14, a first wiring terminal 20 and a second wiring terminal 30 are provided on the mounting seat 10. The card slot 12 and the slot 13 are respectively matched with the first wiring terminal 20 and the second wiring terminal 30, so that the first wiring terminal 20 and the second wiring terminal 30 can be fixed. The fixing platform 14 is used to fix the power lead 41 of the protector 40. Through the first wiring terminal 20 and the second wiring terminal 30, the stator winding, the protector 40 and the carbon brush 50 are connected in series in sequence to form a loop.

[0037] The protector 40 is used to sense the temperature of the stator winding. The closer it is to the stator winding, the closer the sensed temperature is to the temperature of the stator winding, and the better the protection effect on the motor. The protector fixing part 11 is used to fix the protector 40, so the protector fixing part 11 is set as close to or even close to the end face of the motor stator winding as possible. This end face is the end face close to the carbon brush 50. The position layer where the protector fixing part 11 is located needs to be set with the necessary connecting parts of the carbon brush 50 and the rotor 90. After staggering the necessary connecting parts of the carbon brush 50 and the rotor 90, a larger space can be obtained for placing the protector 40, and the fixed protector 40 can also be almost close to the end face of the stator winding, with a small spacing, thereby improving the sensing sensitivity of the protector 40. At the same time, the protector fixing part 11 is also set at the air inlet of the motor air duct. When the motor is working normally, the incoming air can dissipate the heat for the protector 40 and the stator winding, and the protector 40 is difficult to trip; when the motor is running abnormally, because there is no incoming air or the incoming air is very small, the stator winding and the protector 40 are no longer cooled, and the protector 40 can quickly sense the temperature of the stator winding and can quickly trip to protect the motor when the tripping condition is met.

[0038] The protector fixing member 11 is integrally formed with the mounting seat 10, and includes a first fixing portion 111, a second fixing portion 112, and a third fixing portion 113 connected in sequence. The first fixing portion 111 and the third fixing portion 113 are directly connected to the mounting seat 10, and the first fixing portion 111, the second fixing portion 112, the third fixing portion 113 and the mounting seat 10 cooperate to enclose a placement space for the protector 40. In order to prevent the protector fixing member 11 from hindering the protector 40 from sensing temperature, at least one opening 114 is provided on the second fixing portion 112, so as to expose the protector 40 to the greatest extent on the basis of stable fixation, so that there is less obstruction between the protector 40 and the stator 80, so as to facilitate the protector 40 to accurately sense temperature. The protector fixing member 11 is integrally formed with the mounting seat 10.

[0039] As shown Figures 2 - 4 in FIG. 1, the first terminal 20 includes a stator winding connection portion 21 connected to the stator winding, an elastic clamping portion 22 cooperating with the card slot 12 and a first bending stop portion 23, and a first protector connection portion 24 connected to one of the power leads 41 (positive pole) of the protector 40. The stator winding connection portion 21 includes a base 211 and a contact portion 212 integrally formed with the base 211. After the contact portion 212 is smoothly bent, it is placed above the base 211 to form an elastic contact point. Usually, stator winding lead terminals 81 facilitating wiring are provided on the stator winding. In order to facilitate reliable electrical contact, the stator winding lead terminal 81 is set to a shape that can cooperate with the contact portion 212, as shown Figure 8 in FIG. 2. The stator winding lead terminal 81 presses the contact portion 212, and due to the action of the rebounding force, the two are in reliable contact. When installing the first terminal 20, it is inserted from one end of the card slot 12. After the elastic clamping portion 22 passes through the card slot 12, the elastic clamping portion 22 is stuck at one end of the card slot 12. After the first terminal 20 is installed in place, the first bending stop portion 23 will be automatically positioned and stuck at the other end of the card slot 12, thus completing the fixation of the first terminal 20.

[0040] As shown Figures 4 - 6 in FIG. 3, the second terminal 30 includes a carbon brush connection portion 31 connected to the carbon brush 50, a plug portion 32 cooperating with the slot 13 and a second bending stop portion 33, and a second protector connection portion 34 connected to the other power lead 41 (negative pole) of the protector 40. The carbon brush connection portion 31 has a welding processing surface 311, and the carbon brush connection portion 31 is connected to the carbon brush 50 through a welding copper wire 312. When installing the second terminal 30, the two plug portions 32 are respectively inserted into the two slots 13, and then the second bending stop portion 33 is bent and mutually limited with the adjacent slot 13, so that the second terminal 30 is fixed and will not fall out of the slot 13.

[0041] As shown Figure 2 and Figure 5 in FIGS. 4 and 5, both the first protector connection portion 24 and the second protector connection portion 34 are provided with terminal clamping grooves or riveting openings 241 / 341, and the power leads 41 of the protector 40 can be riveted or clamped on the first protector connection portion 24 and the second protector connection portion 34. At the same time, soldering can be performed to further ensure the connection reliability. The two fixing platforms 14 are respectively arranged close to the first protector connection portion 24 and the second protector connection portion 34, making the laying of the power leads 41 of the protector 40 more reasonable and not easily falling off.

[0042] As shown Figure 7As shown in the figure, the present invention also discloses a motor including the built-in fixing structure of the protector 40 as described above, which includes a motor housing 60, a motor cover 70, a stator 80, a rotor 90, a carbon brush 50 and a protector 40. The mounting seat 10 is arranged between the motor housing 60 and the motor cover 70, and can be directly pressed and fixed by the motor housing 60 and the motor cover 70, or can be fixed by bolts. The protector 40 is snap-fitted into the protector fixing member 11, and a carbon brush mounting groove 15 is provided on the mounting seat 10, and the carbon brush 50 is mounted in the carbon brush mounting groove 15.

[0043] Under the same closed environment and the same environmental temperature and humidity, a comparative test is conducted on the motor of the present invention and the motor with the protector placed outside the motor housing. The two motors have the same power, the same protector is selected, and the same trip trigger temperature is set. The air inlets of the two motors are blocked with the same kind of cloth to simulate low air volume operation. According to actual monitoring and multiple tests, the motor of the present invention trips and protects when the stator temperature reaches about 1°C deviation from the trip trigger temperature; while the comparative motor needs to exceed the trip trigger temperature by at least 5°C before it will trigger the trip protection. At this time, the bearing temperature of the comparative motor has also been increased to be close to the trip temperature, while the bearing temperature of the motor of the present invention still has a large difference from the trip temperature. In addition, the trip time of the motor of the present invention can be at least 40% earlier than that of the comparative motor.

[0044] The key of the present invention is that through the first wiring terminal 20 and the second wiring terminal 30, the stator winding, the protector 40 and the carbon brush 50 are connected in series in turn to form a loop, providing a working power supply for the protector 40. Through the protector fixing member 11 on the mounting seat, the protector 40 can be installed close to the stator winding, so that even when the motor operates at low air volume, it can still quickly and effectively sense the temperature of the stator 80, improving the induction sensitivity of the protector 40, and thus better protecting the motor. The mounting seat is arranged inside the motor housing, which will not affect the overall external dimensions of the motor. The mounting seat has a larger mounting space for fixing the protector 40, can better adapt to different specifications and sizes of the protector 40, has little use limitation for the protector 40, and is of great significance for the overall cost control of the motor. The present invention can be applied to the protector 40 with PTC, and the motor temperature protection is more effective.

[0045] The above is only an embodiment of the present invention, and does not impose any limitation on the technical scope of the present invention. Therefore, any minor modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A motor for a dust collection charging base with a built-in fixed structure for a protector, characterized in that: it includes a motor housing, a motor cover, a stator, a rotor, carbon brushes, a protector and a built-in fixed structure for the protector; the built-in fixed structure for the protector includes a mounting seat arranged inside the motor housing, the mounting seat is arranged between the motor housing and the motor cover, and the mounting seat is provided with a protector fixing member, a first terminal and a second terminal; the protector fixing member is arranged close to the stator winding of the motor and is located at the air inlet position of the motor air duct, and the protector is fixed in the protector fixer; the first terminal includes a stator winding connection part connected to the stator winding and a first protector connection part connected to one of the power leads of the protector; the second terminal includes a carbon brush connection part connected to the carbon brush and a second protector connection part connected to the other power lead of the protector; through the first terminal and the second terminal, the stator winding, the protector and the carbon brush are connected in series in sequence to form a loop.

2. The motor for a dust collection charging base with a built-in fixed structure for a protector according to claim 1, characterized in that: the protector fixing member includes a first fixing part, a second fixing part and a third fixing part connected in sequence; the protector fixing member is integrally formed with the mounting seat, and the first fixing part, the second fixing part, the third fixing part and the mounting seat cooperate to enclose a placement space for the protector.

3. The motor for a dust collection charging base with a built-in fixed structure for a protector according to claim 2, characterized in that: the second fixing part has at least one opening.

4. The motor for a dust collection charging base with a built-in fixed structure for a protector according to claim 1, characterized in that: both the first protector connection part and the second protector connection part have terminal clamping grooves or riveting openings.

5. The motor for a dust collection charging base with a built-in fixed structure for a protector according to claim 1, characterized in that: the stator winding connection part includes a base and a contact part integrally formed with the base, the contact part is bent and placed above the base; the stator winding has a stator winding lead-out terminal cooperating with the contact part; the carbon brush connection part has a welding processing surface, and the carbon brush connection part is connected to the carbon brush through a copper wire.

6. The motor for a dust collection charging base with a built-in fixed structure for a protector according to claim 1, characterized in that: the mounting seat is provided with at least one card slot and at least one slot; the first terminal is provided with an elastic clamping part and a first bending stop part cooperating with the card slot; the second terminal is provided with a plug part and a second bending stop part cooperating with the slot.

7. The motor for a dust collection charging base with a built-in fixed structure for a protector according to claim 1, characterized in that: the mounting seat is provided with two fixing platforms for fixing the power leads of the protector, and the two fixing platforms are respectively arranged close to the first protector connection part and the second protector connection part.

8. The motor for a dust collection charging base with a built-in fixed structure for a protector according to claim 1, characterized in that: the mounting seat is made of BMC resin.

9. The motor for a dust collection charging base with a built-in fixing structure for a protector according to claim 1, characterized in that: a carbon brush mounting groove is provided on the mounting base, and the carbon brush is mounted in the carbon brush mounting groove.

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