Direct current motor commutator and motor comprising same

Abstract

The utility model provides a direct current motor commutator and a motor comprising the same. The direct current motor commutator comprises a commutator main body, a piezoresistor and a fixing member. The voltage dependent resistor is sleeved on the commutator main body, and the fixing piece is an elastic piece and is arranged between the voltage dependent resistor and the commutator main body, so that the voltage dependent resistor is connected with the commutator main body. The motor comprises the DC motor commutator. By arranging the elastic fixing piece, the fixing piece is inserted into the gap between the voltage dependent resistor and the commutator main body, the fastening connection of the voltage dependent resistor is realized by utilizing the elastic deformation of the fixing piece, and by adopting the structure for connection instead of tin soldering, the pain points of easy falling and easy pollution caused by the tin soldering can be avoided; operation can be simplified, and assembling efficiency can be improved; meanwhile, the connection reliability can be ensured, and the fixing stability of the piezoresistor in the working process of the direct-current motor commutator is ensured.

Description

Technical Field

[0001] The utility model relates to a DC motor commutator and a motor comprising the same. Background Art

[0002] At present, the commutator and varistor of DC brush motor are usually connected by soldering, such as Figure 1 As shown, the varistor 2 is fixed to the commutator's copper sheet 3 using solder 1. However, soldering has the drawback of making the varistor 2 easily fall off. First, solder 1 is prone to cold joints, which can lead to poor conduction or fall off during operation, causing the motor to freeze and fail. Second, solder 1 has a low melting point of only 150-180°C. The high temperatures generated by the motor's temperature rise, carbon brush friction, and sparks can easily melt the solder 1, causing it and the commutator to fall off, causing the motor to freeze and fail. Furthermore, because solder 1 is composed of tin and lead, the fumes generated during soldering are toxic and pollute the environment. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defect in the prior art that the varistor connected by soldering is easy to fall off, and provide a DC motor commutator and a motor including the same.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] The utility model provides a commutator for a DC motor, which comprises a commutator body, a varistor and a fixing piece; the varistor is sleeved on the commutator body, and the fixing piece is an elastic piece and is arranged between the varistor and the commutator body, so that the varistor is connected to the commutator body.

[0006] In this solution, an elastic fixing part is provided and inserted into the gap between the varistor and the commutator body. The elastic deformation of the fixing part is used to achieve a tight connection of the varistor, avoiding soldering and adopting such a structural connection. The pain points of easy falling off and easy contamination caused by soldering can be avoided; it can also simplify the operation and improve the assembly efficiency. In the conventional process, the commutator needs to be installed first, then the winding, and finally the varistor is welded. This process is not only cumbersome but also requires professional welding equipment to complete. The varistor in the utility model is easy to install. Before winding, the varistor can be installed first and then the commutator can be pressed into the motor shaft and wound; at the same time, the reliability of the connection can be guaranteed, ensuring the stability of the varistor fixation during the operation of the DC motor commutator.

[0007] Preferably, the fixing member includes a pressing portion and a plug-in portion, the pressing portion is a flange extending horizontally from the top of the plug-in portion, and the plug-in portion is inserted into the gap between the varistor and the commutator body, and the varistor is fixed to the commutator body by extrusion.

[0008] In this solution, by forming a flange pressing portion in the horizontal direction, the force-bearing area of ​​the fixing part during installation is increased, the force of the fixing part during installation is made more uniform, and the fixing part is easier to insert between the varistor and the commutator body, thereby improving the convenience of installation.

[0009] Preferably, the size of the plug-in portion is larger than the size of the gap between the varistor and the commutator body.

[0010] In this solution, the size of the plug-in part is slightly larger than the size of the gap between the varistor and the commutator body, which can better utilize elastic deformation, so that the plug-in part provides greater extrusion force to both sides in the gap, thereby improving the stability of the varistor fixation.

[0011] Preferably, the DC motor commutator further comprises copper sheets, the number of the copper sheets is at least three, the copper sheets are circumferentially spaced apart along the outer surface of the commutator body, and the copper sheets are electrically connected to the varistor.

[0012] In this solution, by providing a copper sheet, the varistor can be fixed and at the same time, conduction between the varistor and the copper sheet can be achieved.

[0013] Preferably, the copper sheet is provided with a contact portion extending out of the commutator body, the contact portion is in an angular relationship with the commutator body, the varistor includes an electrode, the side of the varistor with the electrode faces the contact portion and contacts with an end of the contact portion away from the commutator body.

[0014] In this solution, by installing the varistor electrodes in the commutator body in reverse with the electrodes facing downward, the contact parts of the varistor electrodes and the copper sheet can be positioned up and down and in elastic contact, making the conduction between the varistor and the copper sheet more stable, avoiding current instability caused by poor contact, and improving the stability and reliability of the equipment.

[0015] Preferably, the contact portion is perpendicular to the commutator body.

[0016] In this solution, the contact portion of the copper sheet is arranged perpendicular to the commutator body, so that the varistor can fully contact the contact portion of the copper sheet after installation, thereby improving the conduction effect.

[0017] Preferably, the commutator body includes a first body and a second body, the second body is sleeved on the first body, and a connecting part is provided at the end of the copper sheet away from the contact part. The connecting part is tightly attached to the first body and passes between the first body and the second body, and the second body clamps the connecting part to the first body.

[0018] In this solution, the connection portion of the copper sheet can be fixed to the first body of the commutator by providing the second body, thereby preventing the copper sheet from shifting during operation of the commutator and improving the reliability of the commutator.

[0019] Preferably, a groove is provided on one side of the first body where the contact portion is connected to the connecting portion, and the groove allows the contact portion to protrude.

[0020] In this solution, by providing a groove on the first body at the position where the contact portion extends, the contact portion can avoid interference with the commutator when extending out of the commutator.

[0021] Preferably, the first body includes a through hole, and the through hole is used to allow the motor shaft to pass through.

[0022] In this solution, by providing a through hole on the first body, the commutator can be pressed onto the motor shaft and installed in the motor.

[0023] A motor comprises the DC motor commutator as described above.

[0024] In this solution, an elastic fixing part is provided and inserted into the gap between the varistor and the commutator body. The elastic deformation of the fixing part is used to achieve a tight connection of the varistor, avoiding soldering and adopting such a structural connection. The pain points of easy falling off and easy contamination caused by soldering can be avoided; it can also simplify the operation and improve the assembly efficiency. In the conventional process, the commutator needs to be installed first, then the winding, and finally the varistor is welded. This process is not only cumbersome but also requires professional welding equipment to complete. The varistor in the utility model is easy to install. Before winding, the varistor can be installed first and then the commutator can be pressed into the motor shaft and wound; at the same time, the reliability of the connection can be guaranteed, ensuring the stability of the varistor fixation during the operation of the DC motor commutator.

[0025] The positive progress effect of this utility model is:

[0026] The DC motor commutator and the motor including the same of the present invention are provided with an elastic fixing piece, which is inserted into the gap between the varistor and the commutator body, and the elastic deformation of the fixing piece is used to achieve a tight connection of the varistor, avoiding soldering and adopting such a structural connection, which can circumvent the pain points of easy falling off and easy contamination caused by soldering; it can also simplify the operation and improve the assembly efficiency. In the conventional process, the commutator needs to be installed first, then the winding, and finally the varistor is welded. This process is not only cumbersome but also requires professional welding equipment to complete. The varistor in the utility model is easy to install. Before winding, the varistor can be installed first and then the commutator can be pressed into the motor shaft and wound; at the same time, the reliability of the connection can be guaranteed, and the stability of the varistor fixation during the operation of the DC motor commutator can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the soldering connection between the varistor and the commutator in the prior art

[0028] Figure 2 This is an assembly diagram of the DC motor commutator according to an embodiment of the utility model

[0029] Figure 3 A top perspective view of a DC motor commutator according to an embodiment of the present invention

[0030] Figure 4 A bottom perspective view of a DC motor commutator according to an embodiment of the present invention

[0031] Figure 5 A top perspective view of a fixing member according to an embodiment of the present invention

[0032] Figure 6 This is a bottom perspective view of the fixing member of the embodiment of the utility model

[0033] Figure 7 A top perspective view of the commutator body according to an embodiment of the present invention

[0034] Figure 8 This is a bottom perspective view of the commutator body of the embodiment of the utility model

[0035] Figure 9 This is a cross-sectional view of a DC motor commutator according to an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] DC motor commutator 100

[0038] Solder 1

[0039] Varistor 2

[0040] Electrode 21

[0041] Copper sheet 3

[0042] Contact part 31

[0043] Connecting portion 32

[0044] Commutator body 4

[0045] First body 41

[0046] Groove 411

[0047] Through hole 412

[0048] Second body 42

[0049] Fixing 5

[0050] Pressing portion 51

[0051] Connecting portion 52

[0052] Rotor winding 6

[0053] Motor shaft 7 DETAILED DESCRIPTION

[0054] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0055] This embodiment provides a DC motor inverter, such as Figure 2-Figure 4 As shown, it includes a varistor 2, a copper sheet 3, a commutator body 4 and a fixing part 5; the number of copper sheets 3 is at least three, and the copper sheets 3 are arranged at intervals along the circumferential direction of the outer surface of the commutator body 4. The varistor 2 is sleeved on the commutator body 4, and the copper sheet 3 is electrically connected to the varistor 2; the fixing part 5 is arranged between the varistor 2 and the commutator body 4, so that the varistor 2 is connected to the commutator body 4.

[0056] In this way, by providing an elastic fixing member 5, the fixing member 5 is inserted into the gap between the varistor 2 and the commutator body 4, and the elastic deformation of the fixing member 5 is used to achieve a fastened connection of the varistor 2, avoiding soldering and adopting such a structural connection, which can avoid the pain points caused by soldering: since no solder 1 is used, there is no problem of motor jamming and failure caused by cold soldering; since no solder 1 is used, there is no need to worry about the risk of solder 1 melting and falling off at high temperature; since no solder 1 is used, no toxic gas is produced, which is beneficial to the health of workers and the environment; in addition, the operation can be simplified and the assembly efficiency can be improved. In the conventional process, the commutator needs to be installed first and then the winding is carried out, and finally the varistor 2 is welded. This process is not only cumbersome but also requires professional welding equipment to complete. In the utility model, the varistor 2 is easy to install. Before winding, the varistor 2 can be installed first and then the commutator can be pressed into the motor shaft 7 and wound; at the same time, the reliability of the connection can be guaranteed, ensuring the stability of the varistor 2 fixed during the operation of the DC motor commutator 100.

[0057] In this embodiment, the fixing member 5 is an elastic member, which can be made of plastic, preferably high-temperature resistant nylon, or other elastic materials.

[0058] Specifically, if Figure 5 and Figure 6 As shown, the fixing member 5 includes a pressing portion 51 and an inserting portion 52. The pressing portion 51 is a flange extending horizontally from the top of the inserting portion 52. The inserting portion 52 extends downward perpendicularly to the pressing portion 51 to form an inserting piece. Figure 9 As shown, the plug-in portion 52 is inserted into the gap between the varistor 2 and the commutator body 4, and the varistor 2 is fixed to the commutator body 4 by compression.

[0059] In this way, by forming a flange pressing portion 51 in the horizontal direction, the force-bearing area of ​​the fixing member 5 during installation is increased, the force applied to the fixing member 5 during installation is made more uniform, and the fixing member 5 is more easily inserted between the varistor 2 and the commutator body 4, thereby improving the convenience of installation.

[0060] In this embodiment, the pressing portion 51 and the plug-in portion 52 of the fixing member 5 are in a "T" shape, with the pressing portion 51 extending horizontally from the top of the plug-in portion 52 to both ends to form flanges, so that the plug-in portion 52 is located in the middle of the pressing portion 51. The pressing portion 51 and the plug-in portion 52 of the fixing member 5 may also be in an "L" shape, with the pressing portion 51 extending horizontally from the top of the plug-in portion 52 to one side to form flanges, so that the plug-in portion 52 is located at one side edge of the pressing portion 51. Preferably, the pressing portion 51 and the plug-in portion 52 of the fixing member 5 are in a "T" shape. This structure can make the fixing member 5 more evenly stressed during installation and more convenient installation.

[0061] Specifically, the size of the plug-in portion 52 is larger than the size of the gap between the varistor 2 and the commutator body 4 .

[0062] In this way, the size of the plug-in portion 52 is slightly larger than the size of the gap between the varistor 2 and the commutator body 4, which can better utilize elastic deformation, so that the plug-in portion 52 provides a greater squeezing force to both sides in the gap, thereby improving the stability of the fixation of the varistor 2.

[0063] In this embodiment, the size of the plug-in portion 52 is selected based on the size of the commutator. The size of the plug-in portion 52 should match the gap between the varistor 2 and the commutator. Matching means that the size of the plug-in portion 52 is not less than the size of the gap between the varistor 2 and the commutator. Preferably, the plug-in portion 52 has an interference with the gap, preferably, the interference of the plug-in portion 52 is 0.01 mm.

[0064] Specifically, if Figure 2 and Figure 3 As shown, each copper sheet 3 is provided with a contact portion 31 extending out of the commutator body 4, and the contact portion 31 is in an angular relationship with the commutator body 4. The varistor 2 includes electrodes 21, and the number of electrodes 21 corresponds to the number of copper sheets 3. The side of the varistor 2 with the electrode 21 faces the contact portion 31 and contacts the end of the contact portion 31 away from the commutator body 4.

[0065] In this way, by installing the electrode 21 of the varistor 2 on the commutator body 4 in reverse with the electrode 21 facing downward, the electrode 21 of the varistor 2 and the contact part 31 of the copper sheet 3 can be in an upper and lower position and in elastic contact, making the conduction between the varistor 2 and the copper sheet 3 more stable, avoiding current instability caused by poor contact, and improving the stability and reliability of the equipment.

[0066] In this embodiment, the varistor 2 is a resistor ring with one side of the electrode 21 serving as the contact surface for connection with the contact portion 31 of the copper sheet 3. Electrode 21 is made of strontium titanate. When the voltage is normal, the varistor 2 is an insulator and non-conductive. When the voltage exceeds a certain value, the varistor 2 becomes a conductor. The varistor 2 primarily serves to clamp transient voltage spikes, dissipating them as heat in the varistor ring and preventing them from entering the rotor winding 6, thereby improving commutation sparking and EMC.

[0067] Specifically, the contact portion 31 is in a perpendicular relationship to the commutator body 4 .

[0068] In this way, by arranging the contact portion 31 of the copper sheet 3 perpendicularly to the commutator body 4 , the varistor 2 can be in full contact with the contact portion 31 of the copper sheet 3 after installation, thereby improving the conduction effect.

[0069] In this embodiment, when the contact portion 31 of the copper sheet 3 is at an obtuse angle to the commutator body 4, there is an angle between the contact portion 31 and the varistor 2, resulting in incomplete contact and poor conduction effect; when it is at an acute angle, there is also an angle between the contact portion 31 and the varistor 2, resulting in incomplete contact and poor conduction effect; when it is at a right angle, the electrode 21 of the varistor 2 can be parallel to the contact portion 31, and the contact can be maximized during connection, thereby improving the conduction effect; therefore, preferably, the contact portion 31 is at a right angle to the commutator body 4.

[0070] Specifically, the connecting portion 32 and the contact portion 31 of the copper sheet 3 can be integrally formed, or can be separated and combined. Preferably, the connecting portion 32 and the contact portion 31 are integrally formed.

[0071] In this way, the connecting portion 32 and the contact portion 31 of the copper sheet 3 are integrally formed, which can improve manufacturing efficiency and save costs.

[0072] Specifically, if Figure 7 and Figure 8 As shown, the commutator body 4 includes a first body 41 and a second body 42. The second body 42 is sleeved on the first body 41. The end of the copper sheet 3 away from the contact part 31 is provided with a connecting part 32. The connecting part 32 is tightly attached to the first body 41 and passes between the first body 41 and the second body 42. The second body 42 clamps the connecting part 32 on the first body 41.

[0073] In this way, by providing the second body 42 , the connecting portion 32 of the copper sheet 3 can be fixed to the first body 41 of the commutator, thereby preventing the copper sheet 3 from shifting during operation of the commutator and improving the reliability of the commutator.

[0074] In this embodiment, a groove 411 is defined on the first body 41 at the location where the contact portion 31 extends from the commutator body 4. The bottom of the connecting portion 32 extends through the gap between the first body 41 and the second body 42 and then extends to the location of the groove 411. The contact portion 31 then extends into the groove 411 and connects to the bottom of the connecting portion 32. Providing the groove 411 on the first body 41 at the location where the contact portion 31 extends prevents interference with the commutator body 4 when the contact portion 31 extends from the commutator body 4.

[0075] Specifically, if Figure 2 As shown, the first body 41 includes a through hole 412 for allowing the motor shaft 7 to pass through.

[0076] In this way, by providing the through hole 412 on the first body 41 , the commutator can be passed through the motor shaft 7 and installed on the rotor winding 6 of the motor.

[0077] This embodiment further provides a motor, which includes the DC motor commutator 100 as described above.

[0078] Therefore, by providing an elastic fixing member 5, the fixing member 5 is inserted into the gap between the varistor 2 and the commutator body 4, and the elastic deformation of the fixing member 5 is used to achieve a fastened connection of the varistor 2, avoiding soldering and adopting such a structural connection, which can avoid the pain points caused by soldering: since no solder 1 is used, there is no problem of motor jamming and failure caused by cold soldering; since no solder 1 is used, there is no need to worry about the risk of solder 1 melting and falling off at high temperature; since no solder 1 is used, no toxic gas is generated, which is beneficial to the health of workers and the environment; in addition, the operation can be simplified and the assembly efficiency can be improved. In the conventional process, the commutator needs to be installed first and then the winding is carried out, and finally the varistor 2 is welded. This process is not only cumbersome but also requires professional welding equipment to complete. In the utility model, the varistor 2 is easy to install. Before winding, the varistor 2 can be installed first and then the commutator can be pressed into the motor shaft 7 and wound; at the same time, the reliability of the connection can be guaranteed, and the stability of the varistor 2 fixed during the operation of the DC motor commutator 100 can be ensured.

[0079] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A DC motor commutator, characterized in that: The DC motor commutator includes a commutator body, a varistor and a fixing member; the varistor is sleeved on the commutator body, and the fixing member is an elastic member and is arranged between the varistor and the commutator body to connect the varistor to the commutator body.

2. The DC motor commutator according to claim 1, wherein: The fixing part includes a pressing part and a plug-in part. The pressing part is a flange extending horizontally from the top of the plug-in part. The plug-in part is inserted into the gap between the varistor and the commutator body, and the varistor is fixed to the commutator body by extrusion.

3. The DC motor commutator according to claim 2, characterized in that: The size of the plug-in portion is larger than the size of the gap between the varistor and the commutator body.

4. The DC motor commutator according to claim 1, wherein: The DC motor commutator further includes copper sheets, the number of which is at least three. The copper sheets are circumferentially spaced apart along the outer surface of the commutator body, and the copper sheets are electrically connected to the varistor.

5. The DC motor commutator according to claim 4, characterized in that: The copper sheet is provided with a contact portion extending out of the commutator body, the contact portion is in an angular relationship with the commutator body, the varistor includes an electrode, the side of the varistor with the electrode faces the contact portion and contacts with an end of the contact portion away from the commutator body.

6. The DC motor commutator according to claim 5, characterized in that: The contact portion is in a perpendicular relationship to the commutator body.

7. The DC motor commutator according to claim 5, characterized in that: The commutator body includes a first body and a second body, the second body is sleeved on the first body, and a connecting part is provided at one end of the copper sheet away from the contact part. The connecting part is tightly attached to the first body and passes between the first body and the second body. The second body clamps the connecting part to the first body.

8. The DC motor commutator according to claim 7, characterized in that: A groove is formed on one side of the first body where the contact portion is connected to the connection portion, and the groove allows the contact portion to extend out.

9. The DC motor commutator according to claim 7, wherein: The first body includes a through hole, and the through hole is used for allowing the motor shaft to pass through.

10. A motor, characterized in that: It comprises the DC motor commutator according to any one of claims 1 to 9.

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