Brush motor

Abstract

The utility model provides a brush motor, which comprises a shell, and a stator and a rotor are arranged in the shell. The shell comprises a front end cover and a rear end cover, the two ends of the rotor are movably connected to the front end cover and the rear end cover through shafts respectively, the stator is connected to the inner side wall of the rear end cover, a clamping groove is formed in the end, close to the rear end cover, of the front end cover and arranged around the axis of the front end cover, and a buckle is arranged at the end, close to the front end cover, of the rear end cover. The buckle comprises a bending part and an extrusion part, one end of the bending part is connected with the rear end cover, and one end of the bending part far away from the rear end cover is connected with the extrusion part. The end, away from the bent part, of the extrusion part abuts against the clamping groove. The cross section of the bending part is arc-shaped, and the extrusion part is arranged vertically to the bottom surface of the clamping groove. According to the utility model, the looseness of the front end cover and the rear end cover caused by vibration can be reduced, the tight connection of the front end cover and the rear end cover is maintained, an anti-disassembly function is provided, and the damage to the internal structure and connection of the motor due to random disassembly by non-professionals is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a brushed motor. Background Technology

[0002] In fields such as automobiles and medical equipment, miniaturization of motors, especially DC motors, is a current development trend to avoid taking up too much space and weight. Miniaturized DC motors, while reducing size, can maintain high power output, meaning they can provide greater power within the same volume or weight, thus improving equipment performance or reducing overall energy consumption while meeting the same performance requirements. Furthermore, more compact DC motors have relatively lower electromagnetic and mechanical losses during operation, consuming less electrical energy and improving energy efficiency. However, when miniaturized DC motors are used in vibration environments, the housing is prone to loosening, which can lead to equipment failure.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a brushed motor that makes the housing connection firm, avoids the front cover and rear cover from loosening, improves the reliability of the motor, and extends its service life.

[0005] Technical Solution: To achieve the above objectives, this utility model provides a brushed motor, including a housing, within which a stator and a rotor are housed. The housing includes a front cover and a rear cover, the openings of which are connected to form a hollow cavity. The rotor is movably connected at both ends to the front cover and the rear cover, respectively. The stator is connected to the inner wall of the rear cover. A slot is provided at the end of the front cover near the rear cover, the slot being positioned around the axis of the front cover. A buckle is provided at the end of the rear cover near the front cover. The buckle and the slot are correspondingly positioned and engage. The buckle includes a bent portion and a pressing portion. One end of the bent portion is connected to the rear cover, and the end of the bent portion away from the rear cover is connected to the pressing portion. The end of the pressing portion away from the bent portion abuts against the slot. The curved portion has an arc-shaped cross-section, and the pressing portion is vertically positioned at the bottom surface of the slot. The bent portion pushes the pressing portion, and the pressing portion presses against the bottom surface of the slot. This utility model connects the front cover and the rear cover using a buckle and a slot. The buckle is divided into a bending part and a pressing part. The arc-shaped bending part presses the pressing part into the slot. The bending part is elastic and can provide damping in a vibration environment, reducing the loosening of the connection between the front cover and the rear cover caused by vibration, and keeping the front cover and the rear cover tightly connected. The pressing part is vertical to the bottom surface of the slot and has an anti-disassembly function, preventing non-professionals from disassembling it at will and damaging the internal structure and connection of the motor.

[0006] Furthermore, in the brushed motor described above, the rotor includes a shaft and an iron core. The two ends of the shaft are movably connected to a front cover and a rear cover, respectively. The iron core is connected to the outside of the shaft and has windings wound around it. A commutator is located at the end of the shaft near the front cover, and the commutator is coaxially connected to the shaft. The commutator is electrically connected to the windings. When energized, the rotor rotates relative to the stator. This design is simple, has few parts, reduces the failure rate, and facilitates assembly and maintenance.

[0007] Furthermore, in the brushed motor described above, the iron core is composed of multiple stacked chips. An insulating coating is applied between the chips to reduce eddy current losses and improve motor efficiency.

[0008] Furthermore, in the aforementioned brushed motor, the front cover is connected to a terminal block, and carbon brushes are installed inside the front cover. The terminal block is electrically connected to the commutator through the carbon brushes. The motor receives current through the terminal block, providing a standardized connection method that facilitates wiring and enclosure, and improves the convenience of installation and maintenance.

[0009] Furthermore, in the aforementioned brushed motor, the wiring terminals are Z-shaped. The front cover has a connection hole, one end of the wiring terminal is inserted into the fastener and connected to the connection hole, and the middle section of the wiring terminal is snapped into the through groove provided in the front cover. The Z-shaped wiring terminals make the wiring terminal connection more secure, less prone to movement or shaking due to external forces, and enhance the stability of the connection.

[0010] Furthermore, in the aforementioned brushed motor, a carbon brush groove is provided on the side of the front end cover near the rear end cover. The carbon brush is placed within the carbon brush groove, which includes S-shaped sidewalls arranged opposite each other. The middle sections of the two S-shaped sidewalls are located on both sides of the rotor. The carbon brush groove formed by the two S-shaped sidewalls is smaller at both ends and larger in the middle, and the S-shaped sidewalls provide support for the carbon brush. Placing the carbon brush within the carbon brush groove clearly defines the installation position of the carbon brush, limits its movement, reduces the risk of the carbon brush falling out due to vibration, and improves the stability of the equipment.

[0011] Furthermore, in the brushed motor described above, the carbon brush is connected to a spring. The spring is positioned along the S-shaped sidewall, pressing the carbon brush against the commutator to bring them into contact. The placement of the spring along the S-shaped sidewall ensures normal operation of the carbon brush. Simultaneously, the contact between the S-shaped sidewall and the spring maintains stable contact between the carbon brush and the commutator, allowing the pressure from the spring to be more evenly distributed across the contact surface between the carbon brush and the commutator, thus preventing localized wear caused by uneven pressure.

[0012] Furthermore, in the brushed motor described above, a first bearing is located at the center of the front end cover, and a second bearing is located at the center of the rear end cover. The rotor is connected to the first bearing and the second bearing at both ends, respectively. The first bearing and the second bearing can reduce the rotor's rotational resistance and improve the motor efficiency.

[0013] Furthermore, in the brushed motor described above, to prevent leakage and short circuits, the rear end cover is made of a non-conductive material. Non-conductive materials are easy to process and shape, which can reduce weight and cost.

[0014] As can be seen from the above technical solution, this utility model has the following beneficial effects: The brushed motor of this utility model has a simple structure, few parts, low failure rate, and is easy to assemble and maintain. The front and rear covers are connected by snaps and slots. The bent part provides damping in a vibration environment, reducing damage caused by vibration and maintaining a tight connection between the front and rear covers. Furthermore, the pressing part is vertically positioned at the bottom of the slot, providing anti-disassembly functionality and preventing unauthorized disassembly that could damage the internal structure and connections of the motor. The Z-shaped wiring terminals make the connection more secure, less prone to movement or shaking due to external forces, and enhance connection stability. The carbon brushes are placed in the brush slots, clearly defining their installation position and limiting their movement, reducing the risk of brushes coming off due to vibration and improving equipment stability. The carbon brush is connected to a spring, which is set along the S-shaped sidewall to ensure the normal operation of the carbon brush. At the same time, the S-shaped sidewall and the spring contact each other, so that the carbon brush and the commutator maintain stable contact. This makes the pressure of the spring on the carbon brush more evenly distributed on the contact surface of the carbon brush and the commutator, avoiding local wear caused by uneven pressure. Attached Figure Description

[0015] Figure 1 This is a front view of the brushed motor of this utility model;

[0016] Figure 2 for Figure 1 Exploded view;

[0017] Figure 3 for Figure 1 A magnified view of a portion of the image;

[0018] Figure 4 This is a schematic diagram showing the engagement state of the buckle and the slot;

[0019] Figure 5 This is a bottom view of the top cover.

[0020] In the diagram: 1. Housing; 11. Front cover; 111. Slot; 12. Rear cover; 121. Buckle; 1211. Bending part; 1212. Extrusion part; 122. Terminal block; 123. Connecting hole; 124. Carbon brush slot; 1241. S-shaped sidewall; 13. Carbon brush; 131. Spring; 14. First bearing; 15. Second bearing; 2. Stator; 3. Rotor; 31. Shaft; 32. Iron core; 33. Commutator. Detailed Implementation

[0021] Example 1

[0022] like Figure 1-5The illustrated brushed motor includes a housing 1, within which a stator 2 and a rotor 3 are housed. The housing 1 includes a front cover 11 and a rear cover 12, with their openings connected to form a hollow cavity. The rotor 3 is movably connected at both ends to the front cover 11 and the rear cover 12, respectively. The stator 2 is connected to the inner wall of the rear cover 12. The front cover 11 has a slot 111 near the rear cover 12, arranged around the axis of the front cover 11. The rear cover 12 has a buckle 121 near the front cover 11, corresponding to and engaging with the slot 111. The buckle 121 includes a bent portion 1211 and a pressing portion 1212. One end of the bent portion 1211 is connected to the rear cover 12, and the end of the bent portion 1211 away from the rear cover 12 is connected to the pressing portion 1212. The end of the pressing portion 1212 away from the bent portion 1211 abuts against the slot 111. The bending section 1211 has an arc-shaped cross-section, and the pressing section 1212 is vertically positioned on the bottom surface of the slot 111. The bending section 1211 pushes the pressing section 1212, and the pressing section 1212 presses the bottom surface of the slot 111. The rotor 3 includes a rotating shaft 31 and an iron core 32. The two ends of the rotating shaft 31 are movably connected to the front cover 11 and the rear cover 12, respectively. The iron core 32 is connected to the outside of the rotating shaft 31 and has windings. A commutator 33 is provided at the end of the rotating shaft 31 near the front cover 11, and the commutator 33 and the rotating shaft 31 are coaxially connected. The iron core 32 is composed of multiple stacked chips. An insulating coating is provided between the chips. The front cover 11 is connected to a terminal block 122, and a carbon brush 13 is provided inside the front cover 11 (see...). Figure 5 Terminal 122 is electrically connected to commutator 33 via carbon brush 13. Terminal 122 is Z-shaped. The front cover 11 has a connection hole 123; one end of terminal 122 is inserted into the connection hole 123 via a fastener, and the middle section of terminal 122 is engaged in a through groove in the front cover 11. A first bearing 14 is located at the center of the front cover 11, and a second bearing 15 is located at the center of the rear cover 12. Both ends of the rotor 3 are connected to the first bearing 14 and the second bearing 15, respectively. To prevent leakage and short circuits, the rear cover 12 is made of non-conductive material. The stator 2 is made of neodymium iron boron magnets. A carbon brush groove 124 is provided on the side of the front cover 11 near the rear cover 12. The carbon brush 13 is disposed in the carbon brush groove 124. The carbon brush groove 124 includes S-shaped sidewalls 1241, which are arranged opposite each other. The middle sections of the two S-shaped sidewalls 1241 are located on both sides of the rotor 3. The carbon brush groove 124 formed by the two S-shaped sidewalls 1241 is smaller at both ends and larger in the middle. The carbon brush 13 is connected to a spring piece 131, which is arranged along the S-shaped sidewall 1241. The S-shaped sidewall 1241 supports the spring piece 131, and the spring piece 131 presses the carbon brush 13 towards the commutator 33, so that the carbon brush 13 and the commutator 33 come into contact.

[0023] The curved part 1211 of this utility model presses the extrusion part 1212 into the slot 111, connecting the front cover 11 and the rear cover 12. The terminal 122 is electrically connected to the power supply, and the terminal 122 transmits current to the winding through the commutator 33. The winding generates a magnetic field when energized. The magnetic field interacts with the stator 2, and the rotor 3 rotates relative to the stator 2.

[0024] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A brushed motor, characterized in that: The device includes a housing (1), within which a stator (2) and a rotor (3) are disposed; the housing includes a front cover (11) and a rear cover (12), the openings of the front cover (11) and the rear cover (12) being connected to each other to form a hollow cavity; the rotor (3) is axially movably connected at both ends to the front cover (11) and the rear cover (12), respectively; the stator (2) is connected to the inner wall of the rear cover (12); the front cover (11) has a slot (111) near the rear cover (12), the slot (111) being arranged around the axis of the front cover (11); the rear cover (12) has a buckle (12) near the front cover (11). 1) The buckle (121) and the slot (111) are respectively provided, and the buckle (121) and the slot (111) are engaged; the buckle (121) includes a bent part (1211) and a pressing part (1212), one end of the bent part (1211) is connected to the rear end cover (12), and the end of the bent part (1211) away from the rear end cover (12) is connected to the pressing part (1212); the end of the pressing part (1212) away from the bent part (1211) abuts against the slot (111); the cross-section of the bent part (1211) is arc-shaped, and the pressing part (1212) is vertically arranged on the bottom surface of the slot (111).

2. The brushed motor according to claim 1, characterized in that: The rotor (3) includes a shaft (31) and an iron core (32). The two ends of the shaft (31) are movably connected to the front cover (11) and the rear cover (12) respectively. The iron core (32) is connected to the outside of the shaft (31). The iron core (32) is wound with a winding. A commutator (33) is provided at one end of the shaft (31) near the front cover (11). The commutator (33) and the shaft (31) are coaxially connected.

3. The brushed motor according to claim 2, characterized in that: The iron core (32) is composed of multiple stacked chips.

4. The brushed motor according to claim 2, characterized in that: The front cover (11) is connected to a terminal block (122), and a carbon brush (13) is provided inside the front cover (11). The terminal block (122) is electrically connected to the commutator (33) through the carbon brush (13).

5. The brushed motor according to claim 4, characterized in that: The terminal block (122) is shaped like a Z; the front cover (11) is provided with a connection hole (123), one end of the terminal block (122) is inserted into the fastener and connected to the connection hole (123), and the middle section of the terminal block (122) is snapped into the through groove provided in the front cover (11).

6. The brushed motor according to claim 4, characterized in that: The front end cover (11) is provided with a carbon brush groove (124) on the side near the rear end cover (12). The carbon brush (13) is located in the carbon brush groove (124). The carbon brush groove (124) includes an S-shaped sidewall (1241). The S-shaped sidewalls (1241) are arranged opposite to each other. The middle sections of the two S-shaped sidewalls (1241) are respectively located on both sides of the rotor (3). The carbon brush groove (124) formed by the two S-shaped sidewalls (1241) is small at both ends and large in the middle. The S-shaped sidewalls (1241) support the carbon brush (13).

7. The brushed motor according to claim 6, characterized in that: The carbon brush (13) is connected to a spring (131), which is arranged along the S-shaped sidewall (1241). The spring (131) presses the carbon brush (13) toward the commutator (33) so that the carbon brush (13) and the commutator (33) come into contact.

8. The brushed motor according to claim 1, characterized in that: The front end cover (11) is provided with a first bearing (14) at its center, and the rear end cover (12) is provided with a second bearing (15) at its center. The rotor (3) is connected to the first bearing (14) and the second bearing (15) at both ends respectively.

9. The brushed motor according to claim 1, characterized in that: The rear end cover (12) is made of a non-conductive material.

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