A 2-pole multi-slot permanent magnet brush motor

Abstract

This utility model discloses a two-pole multi-slot permanent magnet brushed motor, including a housing assembly, an armature assembly, and a rubber cover assembly, as well as a PCBA assembly and a spring contact assembly. The armature assembly, PCBA assembly, and spring contact assembly are installed in the housing assembly and rubber cover assembly, which are fixed by riveting. The spring contact assembly includes a mounting base, a power connector, carbon brush springs, and carbon brushes. The power connector and carbon brush springs are fixed to the mounting base and soldered to the PCBA assembly. The power connector connects to an external power source, and the carbon brushes, fixed to the carbon brush springs, provide power to the commutator in the armature assembly. The power connector and carbon brush springs in this utility model's spring contact assembly are fixed to the mounting base and soldered to the PCBA assembly. This structure is simple to assemble, easy to automate, and provides external power supply and internal commutator connection, along with electromagnetic compatibility and thermal protection functions, making it an advanced feature.

Description

Technical Field

[0001] This utility model relates to brushed motors, and more particularly to 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 this utility model aims to solve is that most current 2-pole 3-slot (multi-slot) permanent magnet brushed motors have their end cap power connectors, metal connecting pieces, carbon brush springs, PTC, CY capacitors, and magnetic core inductors fixed on plastic end caps (hereinafter referred to as plastic caps). However, due to the small space size of the plastic caps, the plastic cap structure and metal connecting pieces are complex, require high precision, are difficult to install, have a high defect rate, have a large risk of failure, poor reliability, and have high connection risks. Therefore, this utility model provides a 2-pole multi-slot permanent magnet brushed motor.

[0008] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0009] A two-pole multi-slot permanent magnet brushed motor includes a housing assembly, an armature assembly, and a rubber cover assembly, as well as a PCBA assembly and a spring contact assembly. The armature assembly, PCBA assembly, and spring contact assembly are installed in the housing assembly and the rubber cover assembly, which are fixed together by riveting. The spring contact assembly includes a base, a power connector, carbon brush springs, and carbon brushes. The power connector and carbon brush springs are fixed to the base and soldered to the PCBA assembly. The power connector connects to an external power source, and the carbon brushes, fixed to the carbon brush springs, provide power to the commutator in the armature assembly.

[0010] In a preferred embodiment of the present invention, the spring contact assembly is riveted onto the PCBA assembly.

[0011] In a preferred embodiment of this utility model, the PCBA assembly includes a PCB, a magnetic core inductor, a PTC, a CX chip capacitor, a CY chip capacitor, and a grounding wire, and the power connector and carbon brush spring are soldered on the PCB.

[0012] In a preferred embodiment of the present invention, a printed circuit is provided on the PCB.

[0013] In a preferred embodiment of this utility model, the carbon brush spring is stamped from a 0.06-0.1mm beryllium copper sheet, and its mounting end, which is installed with the fixing base, has a folded structure.

[0014] In a preferred embodiment of this utility model, the power connector is stamped from a 0.2-0.4mm phosphor bronze sheet.

[0015] Thanks to the above technical solution, the power connector and carbon brush spring in the spring connector assembly are fixed to the base 510 and soldered to the PCBA assembly. This structure is simple to assemble, easy to automate, and has external power supply, internal commutator, electromagnetic compatibility and thermal protection functions, making it an advanced feature.

[0016] Because the base secures the power connector and carbon brush springs, it replaces the function of the ordinary motor cover in securing the power connector and carbon brush springs; the printed circuitry on the PCB replaces the function of the metal connecting pieces on the ordinary motor cover. Therefore, the cover has a simple structure, relatively large space for easy iteration and customized production, can be quickly replaced according to user needs, and can accommodate relatively large PCBAs to meet user requirements. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of a 2-pole multi-slot permanent magnet brushed motor according to the present invention.

[0018] Figure 2 This is an exploded view of a 2-pole multi-slot permanent magnet brushed motor according to the present invention.

[0019] Figure 3 This is an exploded view of the housing assembly of a 2-pole multi-slot permanent magnet brushed motor according to the present invention.

[0020] Figure 4 This is an exploded view of the armature portion of a 2-pole multi-slot permanent magnet brushed motor according to the present invention.

[0021] Figure 5 This is a schematic diagram of a PCBA assembly for a 2-pole multi-slot permanent magnet brushed motor according to the present invention.

[0022] Figure 6 This is a schematic diagram of the overall PCBA of a 2-pole multi-slot permanent magnet brushed motor according to the present invention.

[0023] Figure 7 This is a schematic diagram of the electrical principle of a PCBA assembly for a 2-pole multi-slot permanent magnet brushed motor according to this utility model.

[0024] Figure 8 This is an exploded view of the spring contact assembly of a 2-pole multi-slot permanent magnet brushed motor according to the present invention.

[0025] Figure 9 This is a schematic diagram of the component breakdown of the rubber cover assembly of a 2-pole multi-slot permanent magnet brushed motor according to this utility model.

[0026] Figure 10 This is an assembly diagram of the PCBA assembly and the rubber cover assembly of a 2-pole multi-slot permanent magnet brushed motor according to this utility model. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] See Figures 1 to 10The figure shows a two-pole multi-slot permanent magnet brushed motor 100, including a housing assembly 200, an armature assembly 300, a PCBA assembly 400, a spring contact assembly 500, and a rubber cover assembly 600. The armature assembly 300, PCBA assembly 400, and spring contact assembly 500 are installed in the housing assembly 200 and the rubber cover assembly 600, which are fixed together by riveting.

[0029] The housing assembly 200 includes a housing 210, a pair of magnetic tiles 240, a pair of magnetic tile clips 230, and a straight bearing 220. The straight bearing 220 is used to rotatably support the armature shaft 310 in the electric drive assembly 300. The pair of magnetic tiles 240 are mounted in the housing 210 via the pair of magnetic tile clips 230.

[0030] The electric drive assembly 300 includes an armature shaft 310, an armature lamination group 320, a winding 330, a commutator 340, a limiting copper sleeve 350, a varistor 360, an oil separator gasket 370, a wear-resistant gasket 380, and an insulating gasket 390. The armature lamination group 320 is mounted on the armature shaft 310 after the armature laminations are stacked. At one end of the armature shaft 310, the varistor 360, the commutator 340, the oil separator gasket 370, and the wear-resistant gasket 380 are installed sequentially from the inside to the outside. At the other end of the armature shaft 310, the insulating gasket 390, the limiting copper sleeve 350, and the wear-resistant gasket 380 are installed sequentially from the inside to the outside.

[0031] The PCBA assembly 400 includes a PCB 410, a magnetic core inductor 420, a PTC 430, a CX surface mount capacitor 450, two CY surface mount capacitors 440, and a grounding wire 460. The PTC 430 is used for overheat protection, the CX surface mount capacitor 450 is used for power line filtering to eliminate differential mode interference, and the CY surface mount capacitor 440 eliminates common mode interference in the circuit, thereby improving the anti-interference capability and electromagnetic compatibility of electronic equipment.

[0032] The spring-loaded connector assembly 500 includes a mounting base 510, a power connector 520, a carbon brush spring 540, and a carbon brush 530. The power connector 520 connects to an external power source and is fixed to the mounting base 510; the carbon brush 530 is fixed to the carbon brush spring 540, which in turn is fixed to the mounting base 510, providing power to the commutator 340 in the armature assembly 300.

[0033] The carbon brush spring 540 is stamped from a 0.06-0.1mm beryllium copper sheet. The folded structure at the mounting end increases its strength and thickness, and it can be directly fixed to the mounting base 510. The power connector 520 is stamped from a 0.2-0.4mm phosphor bronze sheet and can be directly fixed to the mounting base 510.

[0034] The spring contact assembly 500 is crimped onto PCBA 400, while the power connector 520 and carbon brush spring 540 are soldered onto PCB 410.

[0035] The rubber cover assembly 600 includes a rubber cover 610, a ball bearing 620, and a gasket 630. The ball bearing 620 is press-fitted into the rubber cover 610 and held and secured by the three-pronged latch of the rubber cover 610. The ball bearing 620 can rotate freely around a central point within the rubber cover 610, engaging with the armature shaft 310. The gasket 630 restricts the movement of the armature shaft 310.

[0036] Most of the components of a 2-pole 3-slot (multi-slot) permanent magnet brushed motor, such as the power connector, metal connecting piece, carbon brush spring, PTC, CY capacitor, and magnetic core inductor, are fixed on a plastic end cap (referred to as the plastic cap).

[0037] The power connector 520 and carbon brush spring 540 are fixed to the mounting base 510 and soldered to the PCBA assembly 400. This structure is simple to assemble and easy to automate. It has an external power supply and an internal commutator 340, and has electromagnetic compatibility and thermal protection functions. Its functions are advanced.

[0038] Because the mounting bracket 510 secures the power connector 520 and carbon brush spring 540, it replaces the function of securing the power connector and carbon brush spring in a standard motor cover; and the printed circuitry on the PCB 410 replaces the function of the metal connecting pieces on a standard motor cover. Therefore, the cover 610 has a simple structure, is easy to iterate and customize, and can be quickly replaced according to user needs.

[0039] This invention applies to 2-pole 3-slot (multi-slot) permanent magnet brushed motors with a flat or cylindrical shape, a diameter of Ø20-30 mm, and a length of 25-35 mm. These motors are used in small automotive devices with specific size and performance requirements, such as central locking systems, rearview mirrors, electric door handles, charging port covers, air conditioning vents, and some micro-car actuators.

Claims

1. A two-pole multi-slot permanent magnet brushed motor, comprising a housing assembly, an armature assembly, and a rubber cover assembly, characterized in that, It also includes a PCBA assembly and a spring contact assembly. The armature assembly, PCBA assembly, and spring contact assembly are installed in the housing assembly and the cover assembly, which are fixed by riveting. The spring contact assembly includes a mounting base, a power connector, a carbon brush spring, and a carbon brush. The power connector and carbon brush spring are fixed on the mounting base and soldered to the PCBA assembly. The power connector connects to an external power source, and the carbon brush is fixed on the carbon brush spring to provide power to the commutator in the armature assembly.

2. The two-pole multi-slot permanent magnet brushed motor according to claim 1, characterized in that, The spring and connector are fixed on the mounting base.

3. A two-pole multi-slot permanent magnet brushed motor according to claim 1, characterized in that, The spring contact assembly is riveted onto the PCBA assembly.

4. A two-pole multi-slot permanent magnet brushed motor according to claim 1, characterized in that, The PCBA assembly includes a PCB, a magnetic core inductor, a PTC, CX surface mount capacitors, CY surface mount capacitors, and a grounding wire. The power connector and carbon brush springs are soldered onto the PCB.

5. A two-pole multi-slot permanent magnet brushed motor according to claim 4, characterized in that, Printed circuitry is provided on the PCB.

6. A two-pole multi-slot permanent magnet brushed motor according to claim 1, characterized in that, The carbon brush spring is stamped from a 0.06-0.1mm beryllium copper sheet, and its mounting end, which is installed with the fixing base, has a folded structure.

7. A two-pole multi-slot permanent magnet brushed motor according to claim 1, characterized in that, The power connector is made of 0.2-0.4mm phosphor bronze sheet by stamping.

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