A permanent magnet DC motor with a pressure sensitive resistor PCBA with coded magnets

Abstract

This utility model discloses a permanent magnet DC motor with a varistor PCBA containing an coded magnet, comprising: a housing; a stator assembly installed within the housing; a rotor assembly installed within the stator assembly; a shaft extending from one end of the housing; a brush support assembly installed at the other end of the housing, the brush support assembly being connected to the stator assembly and supporting the rotation of the rotor assembly; and a varistor PCBA containing an coded magnet, which is mounted on the commutator of the rotor assembly and fixed and conductive using soldering. In this utility model, the coded magnet is located inside the motor. The housing and brush support assembly protect the varistor PCBA containing the coded magnet, preventing external magnetic field interference and damage to the magnetic field of the coded magnet. Furthermore, the varistor PCBA containing the coded magnet, installed inside the brush support assembly, includes a Hall sensor and connector, reducing the motor size.

Description

Technical Field

[0001] This utility model relates to permanent magnet DC motors, and more particularly to a permanent magnet DC motor with a varistor PCBA containing a coded magnet. Background Technology

[0002] Automotive functions such as window rolling, door locks, sunshades, seat adjustment, headrest adjustment, side-opening doors, and tailgate supports mostly use permanent magnet DC motors for driving. These requirements necessitate low noise, minimal carbon brush sparking, surge resistance, armature position detection, speed measurement, memory function, and connector / external connection capabilities for permanent magnet DC motors. These numerous requirements increase the size and length of the permanent magnet DC motor, necessitating the addition of accessories.

[0003] See Figure 1 and Figure 2 A conventional permanent magnet DC motor A consists of a housing 1, a stator assembly 2 installed inside the housing 1, a rotor assembly 3 installed in the stator assembly 2, a varistor 4 welded to the rotor assembly 3, a brush bracket 5 mounted on the rotor assembly, an encoding magnet 6 mounted on the brush bracket 5, a PCBA board 7, and a connector housing 8 mounted on the housing 1. The varistor 4 is a SrTiO3 (strontium titanate) semiconductor; the encoding magnet 6 is mounted on the outside of the housing 1; the connector 9 and Hall effect sensor are welded to the PCBA board 7; and the entire assembly is surrounded and protected by the housing 8. This mounting method results in a longer permanent magnet DC motor and an increased volume. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a permanent magnet DC motor with a varistor PCBA containing coded magnets that has a simple structure, is easy to install, and has a small size, in order to address the above-mentioned technical problems existing in existing permanent magnet DC motors.

[0005] The technical problem to be solved by this utility model can be achieved through the following technical solution:

[0006] A permanent magnet DC motor with a varistor PCBA having an coded magnet, comprising:

[0007] chassis;

[0008] Stator assembly installed inside the housing;

[0009] A rotor assembly installed in the stator assembly; the rotor shaft in the rotor assembly extends from one end of the housing;

[0010] A brush support assembly is installed at the other end of the housing, the brush support assembly is connected to the stator assembly and supports the rotation of the rotor assembly; characterized in that it further includes a varistor PCBA with a coded magnet, the varistor PCBA with the coded magnet is installed on the commutator of the rotor assembly and is fixed and connected by soldering.

[0011] In a preferred embodiment of this invention, the varistor PCBA with coded magnet consists of a PCB board, a magnet, and a surface-mount capacitor, wherein the surface-mount capacitor is 10-40pF. The magnet has 2-4 poles and its end faces are magnetized.

[0012] In a preferred embodiment of this utility model, the brush bracket assembly consists of a brush bracket and a motor PCBA assembly; the motor PCBA assembly includes a Hall sensor and a connector.

[0013] Thanks to the above technical solution, the coded magnet is located inside the motor. The housing and brush bracket assembly protect the varistor PCBA with the coded magnet, preventing external magnetic field interference and damage to the magnetic field of the coded magnet. Furthermore, the varistor PCBA with the coded magnet, housed within the brush bracket assembly, includes a Hall sensor and connector, reducing the motor's size.

[0014] In this invention, the varistor PCBA with coded magnet combines the functions of a varistor and a coded magnet, which can reduce the noise of permanent magnet DC motors, reduce carbon brush sparks, and has armature position detection, speed measurement, and memory functions, with a simple structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external shape of an existing permanent magnet DC motor.

[0016] Figure 2 This is an exploded view of an existing permanent magnet DC motor.

[0017] Figure 3 This is a schematic diagram of the external shape of the permanent magnet DC motor of this utility model.

[0018] Figure 4 This is one of the exploded schematic diagrams of the permanent magnet DC motor of this utility model.

[0019] Figure 5 This is the second exploded view of the permanent magnet DC motor of this utility model.

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

[0021] Figure 7 This is one of the schematic diagrams of the varistor PCBA with coded magnet of this utility model.

[0022] Figure 8 This is the second schematic diagram of the varistor PCBA with coded magnet of this utility model.

[0023] Figure 9 This is one of the schematic diagrams of the brush holder assembly of this utility model.

[0024] Figure 10 This is the second schematic diagram of the brush holder assembly of this utility model.

[0025] Figure 11 This is the third schematic diagram of the brush bracket assembly of this utility model.

[0026] Figure 12 This is the fourth schematic diagram of the brush bracket assembly of 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 3 to 12 The permanent magnet DC motor B shown in the figure is a varistor PCBA with coded magnets, including: a housing 100, a stator assembly 200 installed in the housing 100, and a rotor assembly 300 installed in the stator assembly 200; the rotating shaft 310 in the rotor assembly 300 extends from one end of the housing 100.

[0029] The brush bracket assembly 400 is installed at the other end of the housing 100. The brush bracket assembly 400 is connected to the stator assembly 200 and supports the rotation of the rotor assembly 300. The above is the prior art, and will not be described in detail.

[0030] The feature of this utility model is that it also includes a varistor PCBA 500 with an encoded magnet. The varistor PCBA 500 with the encoded magnet is mounted on the commutator 320 of the rotor assembly 300 and is fixed and conductive by soldering.

[0031] The varistor PCBA 500 with coded magnet consists of a PCB board 510, a coded magnet 520, and a surface-mount capacitor 530, where the surface-mount capacitor 530 is 10-40pF. The coded magnet 520 has 2-4 poles and is magnetized at its terminals. The varistor PCBA 500 with coded magnet also includes a Hall sensor (not shown in the figure) and a connector (not shown in the figure).

[0032] Since the coded magnet 520 is located inside the motor, the housing 100 and brush bracket assembly 400 protect the varistor PCBA 500 with the coded magnet, preventing external magnetic field interference and damage to the magnetic field of the coded magnet 520. Furthermore, the varistor PCBA 500 with the coded magnet, installed inside the brush bracket assembly 400, also includes a Hall sensor and connector, reducing the motor size.

[0033] In addition, the varistor PCBA with coded magnet combines the functions of a varistor and a coded magnet 520, which can reduce the noise of permanent magnet DC motors, reduce carbon brush sparks, and has armature position detection, speed measurement, memory function, and simple structure.

[0034] The brush bracket assembly 400 consists of a brush bracket 410 and a motor PCBA assembly 420; the motor PCBA assembly 420 includes a Hall sensor 421 and a connector 422.

Claims

1. A permanent magnet DC motor with a varistor PCBA having an coded magnet, comprising: chassis; Stator assembly installed inside the housing; The rotor assembly installed in the stator assembly; The rotor shaft in the rotor assembly extends from one end of the housing; A brush support assembly is installed at the other end of the housing, the brush support assembly is connected to the stator assembly and supports the rotation of the rotor assembly; characterized in that it further includes a varistor PCBA with a coded magnet, the varistor PCBA with the coded magnet is installed on the commutator of the rotor assembly and is fixed and connected by soldering.

2. The permanent magnet DC motor with a PCBA of a pressure sensitive resistance with an encoded magnet according to claim 1, characterized in that, The varistor PCBA with coded magnet consists of a PCB board, a magnet, and a surface-mount capacitor, wherein the surface-mount capacitor is 10-40pF, the magnet has 2-4 poles, and the end face is magnetized.

3. A permanent magnet DC motor with a varistor PCBA having an encoded magnet as described in claim 1, characterized in that, The brush bracket assembly consists of a brush bracket and a motor PCBA assembly; the motor PCBA assembly includes a Hall sensor and a connector.

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