A structure of a two-pole multi-slot permanent magnet brushed motor

Abstract

This utility model discloses a structure for a two-pole multi-slot permanent magnet brushed motor, including a housing assembly, an armature assembly, a rubber cover assembly, and a PCBA assembly. The rubber cover assembly houses the armature assembly and the PCBA assembly within the housing assembly, and the PCBA assembly is fixed within the rubber cover assembly. The PCBA assembly comprises a PCBA, two power connectors, two carbon brush springs, two carbon brushes, two inductors, and one grounding wire. The two carbon brush springs, two inductors, and one grounding wire are soldered into the PCBA. The power connectors connect to an external power source. The two carbon brushes are respectively secured by the clips of the two carbon brush springs and connected to the commutator in the armature assembly. The grounding wire is used for grounding the PCBA. This utility model enables automated production, improves production efficiency, and enhances product reliability.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet brushed motor technology, and in particular to a structure of a two-pole multi-slot permanent magnet brushed motor. Background Technology

[0002] The 2-pole 3-slot (multi-slot) permanent magnet brushed motor is flat or cylindrical in shape, with a diameter of Ø20-30 mm and a length of 25-35 mm. It is suitable for lightweight equipment with limited space. Its operating voltage range is 9.0V to 16.0V. The motor has a built-in varistor, which can protect against voltage fluctuations or starting current surges, enhancing overall safety and stability.

[0003] Two-pole, three-slot (multi-slot) permanent magnet brushed motors, with their stable performance and excellent adaptability to continuous operation, can achieve continuous drive within limited spaces and are widely used in small devices with specific size and performance requirements. Examples include automotive components such as central locking systems, rearview mirrors, electric door handles, charging port covers, air conditioning vents, and some micro-car actuators; office equipment such as printers and copiers; commercial equipment such as ATMs and vending machines; home appliances such as electric shavers, electronic door locks, and massagers; and toys such as four-wheel drive vehicles, robots, and drones. These motors have a very wide range of applications and a large market capacity.

[0004] Due to space constraints, 2-pole 3-slot (multi-slot) permanent magnet brushed motors typically use metal springs, connecting pieces, and terminals to connect electronic components such as PTCs, magnetic core inductors, and CY capacitors in their end cover assemblies (brush bracket assemblies). Therefore, existing 2-pole 3-slot (multi-slot) permanent magnet brushed motors have complex end cover and metal connecting piece structures, require high precision, and suffer from difficult assembly, automation challenges, low production efficiency, high defect rates, significant potential failure risks, poor reliability, and high connection risks.

[0005] Due to space constraints, 2-pole 3-slot (multi-slot) permanent magnet brushed motors have a limited variety and quantity of electronic components connected by metal connecting plates. They also lack PCBA and grounding functions, resulting in low EMC ratings and poor electromagnetic compatibility.

[0006] Most components of 2-pole 3-slot (multi-slot) permanent magnet brushed motors, such as the end cap power connector, metal connecting pieces, carbon brush springs, PTC, CY capacitors, and magnetic core inductors, are fixed to plastic end caps (referred to as plastic caps). Due to the small space size of the plastic caps, the structure of the plastic caps and metal connecting pieces is complex, requires high precision, is difficult to install, has a high defect rate, a high risk of failure, poor reliability, and a high connection risk. Utility Model Content

[0007] The technical problem to be solved by this utility model is to address the problems existing in the prior art, such as the small size of the glue cover leading to the complexity of the glue cover structure and metal connecting piece, high precision, difficult installation, high defect rate, large failure risk, poor reliability, and high connection risk. The present invention provides a two-pole multi-slot permanent magnet brushed motor structure with a simple glue cover structure that can accommodate a larger PCBA and solder the power connector, carbon brush spring, magnetic core inductor, etc. to the PCBA.

[0008] The technical problem to be solved by this utility model can be achieved through the following technical solution: A two-pole multi-slot permanent magnet brushed motor structure includes a housing assembly, an armature assembly, a rubber cover assembly, and a PCBA assembly. The rubber cover assembly houses the armature assembly and the PCBA assembly within the housing assembly. The PCBA assembly is fixed within the rubber cover assembly. The PCBA assembly comprises a PCBA, two power connectors, two carbon brush springs, two carbon brushes, two inductors, and one grounding wire. The two carbon brush springs, two inductors, and one grounding wire are soldered into the PCBA. The power connectors connect to an external power source. The two carbon brushes are respectively fixed by the clips of the two carbon brush springs and connected to the commutator in the armature assembly. The grounding wire is used for grounding the PCBA.

[0009] In a preferred embodiment of this utility model, the PCBA includes a PCB, a PTC, a CX surface mount capacitor, and two CY surface mount capacitors; the PTC is used for overheat protection; the CX surface mount capacitor is used for power line filtering to eliminate differential mode interference; the CY surface mount capacitor eliminates common mode interference in the circuit, thereby improving the anti-interference capability and electromagnetic compatibility of the electronic equipment.

[0010] In a preferred embodiment of this utility model, the carbon brush spring is also fixed on the rubber cover.

[0011] In a preferred embodiment of this utility model, the carbon brush spring is stamped from a 0.06-0.1mm beryllium copper sheet, and the end of the carbon brush spring that connects to the adhesive cap and the PCBA has a folded structure to increase strength and thickness.

[0012] In a preferred embodiment of this utility model, a U-shaped protrusion is provided at the end where the carbon brush spring is connected to the adhesive cover and the PCBA assembly.

[0013] In a preferred embodiment of this utility model, the end of the carbon brush spring that is connected to the adhesive cap and the PCBA assembly has a T-shaped symmetrical structure.

[0014] By adopting the above technical solution, this utility model can realize automated production, improve production efficiency, and enhance product reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of the 2-pole multi-slot permanent magnet brushed motor of this utility model.

[0016] Figure 2 This is an exploded view of the structure of the 2-pole multi-slot permanent magnet brushed motor of this utility model.

[0017] Figure 3 This is a schematic diagram of the overall structure of the housing of this utility model.

[0018] Figure 4 This is an exploded view of the armature assembly of this utility model.

[0019] Figure 5 This is a schematic diagram showing the overall composition of the adhesive cap of this utility model.

[0020] Figure 6 This is a schematic diagram of the PCBA assembly of this utility model.

[0021] Figure 7 This is a schematic diagram of the PCBA structure of this utility model.

[0022] Figure 8 This is a schematic diagram showing the installation between the PCBA assembly and the housing of this utility model.

[0023] Figure 9 This is an exploded view of the PCBA assembly and housing of this utility model.

[0024] Figure 10 This is a schematic diagram of the carbon brush spring structure of this utility model.

[0025] Figure 11 This is a schematic diagram of the electrical principle of the 2-pole multi-slot permanent magnet brushed motor structure of this utility model. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] See Figures 1 to 9 The figure shows a 2-pole multi-slot permanent magnet brushed motor structure 100 with a diameter of Φ20-30mm and a length of 25-35mm.

[0028] It includes a housing assembly 200, an armature assembly 300, a rubber cover assembly 400, and a PCBA assembly 500. The rubber cover assembly 400 installs the armature assembly 300 and the PCBA assembly 500 within the housing assembly 200.

[0029] PCBA assembly 500 includes PCBA 510, 2 power connectors 520, 2 carbon brush springs 530, 2 carbon brushes 540, 2 inductors 550 and 1 grounding wire 560.

[0030] Two carbon brush springs 530, two inductors 540, and one grounding wire 560 are soldered in PCBA 510. The two inductors 540 are symmetrically soldered on the outside of PCBA 510, the two carbon brush springs 530 are symmetrically soldered on PCBA 510 and located between the two inductors 540, and the grounding wire 560 is soldered on one corner of PCBA 510.

[0031] Two carbon brush springs 530 are also fixed to the rubber cover 410. The two carbon brush springs 530 are stamped from a 0.06-0.1mm thick beryllium copper sheet. The end where the two carbon brush springs 530 connect to the rubber cover 410 and PCBA 510 has a folded structure (not shown in the figure) to increase strength and thickness. The end where the two carbon brush springs 530 connect to the rubber cover 410 and PCBA 510 also has a U-shaped protrusion (not shown in the figure) for good elasticity. The end where the two carbon brush springs 530 connect to the rubber cover 410 and PCBA 510 also has a T-shaped symmetrical structure (not shown in the figure), thus improving the utilization rate of the components.

[0032] Two carbon brushes 540 are fixed to the other end of two carbon brush springs 530 by clips, which electrically contact the commutator 360 in the armature assembly 300.

[0033] The two power connectors 520 are for connecting to an external power source; the grounding wire 560 is for grounding the PCBA 510.

[0034] PCBA 510 includes PCB 511, PTC 512, CX surface mount capacitor 513, and two CY surface mount capacitors 514; PTC 512 is used for overheat protection; CX surface mount capacitor 513 is used for power line filtering to eliminate differential mode interference; CY surface mount capacitor 514 eliminates common mode interference in the circuit, thereby improving the anti-interference capability and electromagnetic compatibility of electronic equipment.

[0035] The housing assembly 200 includes a housing 210, a pair of magnetic tiles 220, a pair of magnetic tile clips 230, and a straight bearing 240; the straight bearing 240 is installed at the end of the housing 210, and one end of the armature shaft 310 in the power supply armature assembly 300 is axially mounted; the pair of magnetic tiles 220 and the pair of magnetic tile clips 230 are disposed inside the housing 210, and the pair of magnetic tile clips 230 are located between the pair of magnetic tiles 220 and press the pair of magnetic tiles 220 against the housing 210.

[0036] The armature assembly 300 includes an armature shaft 310, an armature lamination 320, a limiting copper sleeve 330, an armature winding 350, a commutator 360, an oil separator gasket 370, a pair of wear-resistant gaskets 380, and a varistor 390. The armature shaft 310 is located at the center of the armature lamination 320 and extends out of the armature lamination 320 at both ends. The armature winding 350 is wound inside the armature lamination 320. An insulating layer 340 is coated on the side of the armature lamination 320 opposite to the commutator 360.

[0037] The commutator sleeve 360 ​​is press-fitted onto one end of the armature shaft 310 via an oil separator gasket 370 and a wear-resistant gasket 380; a varistor 390 is fitted onto the commutator 360; a limiting copper sleeve 330 and a wear-resistant gasket 380 are fitted onto the other end of the armature shaft 310; the two wear-resistant gaskets 380 are in contact with the straight bearing 240 on the housing 210 and the ball bearing 420 on the rubber cover assembly 400, respectively.

[0038] The rubber cover assembly 400 also includes a rubber cover 410, and a ball bearing 420 is riveted to the rubber cover 410 by three claws on the rubber cover 410. The inner ring of the ball bearing 420 is tightly fitted with the other end of the armature shaft 310 and rotates around the center point of the rubber cover.

[0039] Three adhesive posts 411 are provided in the adhesive cover 410, and the PCBA assembly 500 is riveted to the adhesive cover 410 through these three adhesive posts 411.

Claims

1. A structure for a two-pole multi-slot permanent magnet brushed motor, comprising a housing assembly, an armature assembly, a rubber cover assembly, and a PCBA assembly, wherein the rubber cover assembly houses the armature assembly and the PCBA assembly within the housing assembly, and the PCBA assembly is fixed within the rubber cover assembly, characterized in that, The PCBA assembly includes a PCBA, two power connectors, two carbon brush springs, two carbon brushes, two inductors, and one grounding wire. The two carbon brush springs, two inductors, and one grounding wire are soldered into the PCBA. The power connectors are connected to an external power source. The two carbon brushes are respectively fixed by the clips of the two carbon brush springs and connected to the commutator in the armature assembly. The grounding wire is used for grounding the PCBA.

2. The structure of a two-pole multi-slot permanent magnet brushed motor according to claim 1, characterized in that, The PCBA includes a PCB, a PTC, CX surface mount capacitors, and two CY surface mount capacitors. The PTC is used for overheat protection. The CX surface mount capacitors are used for power line filtering to eliminate differential-mode interference. The CY surface mount capacitors eliminate common-mode interference in the circuit, thereby improving the anti-interference capability and electromagnetic compatibility of the electronic equipment.

3. The structure of a two-pole multi-slot permanent magnet brushed motor according to claim 2, characterized in that, The carbon brush spring is also fixed to the rubber cover.

4. The structure of a two-pole multi-slot permanent magnet brushed motor according to claim 3, characterized in that, The carbon brush spring is stamped from a 0.06-0.1mm beryllium copper sheet. The end of the carbon brush spring that connects to the adhesive cap and PCBA has a folded structure to increase strength and thickness.

5. The structure of a two-pole multi-slot permanent magnet brushed motor according to claim 4, characterized in that, The end of the carbon brush spring that connects to the adhesive cap and PCBA assembly is provided with a U-shaped protrusion.

6. The structure of a two-pole multi-slot permanent magnet brushed motor according to claim 5, characterized in that, The end of the carbon brush spring that connects to the adhesive cap and PCBA assembly has a T-shaped symmetrical structure.

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