A cover assembly for a DC motor

Abstract

A cover assembly for a DC motor includes a cover component, a positive terminal plug, a negative terminal plug, a PCB control module, a positive inductor, a negative inductor, a positive brush component, and a negative brush component. The positive and negative terminal plugs are fixed to the cover component. The positive terminal plug is electrically connected to the PCB control module, the positive inductor is electrically connected to the PCB control module, the positive brush component is electrically connected to the positive inductor, and the negative terminal plug is electrically connected to the PCB control module. The negative multilayer inductor is connected to the PCB control module to conduct current, and the negative brush component is electrically connected to the inductor. The positive and negative brush components are respectively slidably electrically connected to a commutator component on the motor armature component. The positive inductor consists of one or more layers of coils, and the negative inductor consists of one or more layers of coils. This design can meet the requirements of application scenarios with limitations on the axial length of the motor.

Description

Technical Field

[0001] This utility model relates to a cover assembly for a DC motor. Background Technology

[0002] With the rapid development and progress of the automotive industry, various types of motors, such as electric window motors, tailgate motors, seat motors, EPS motors, and ABS motors, are increasingly widely used in automobiles, making vehicle functions more comprehensive and richer, and providing a better driving experience and comfort. However, motors generate electromagnetic interference during operation, which can affect the normal operation of onboard electrical equipment, causing malfunctions. It can also lead to inaccurate sensor data in onboard electronic systems, affecting the normal operation of core modules such as the powertrain and braking systems, posing potential driving safety hazards. Therefore, electromagnetic compatibility (EMC) requirements must be met.

[0003] To meet the electromagnetic compatibility (EMC) requirements of DC motors, a PCB control module integrating electronic components and a series inductor are usually installed inside the motor's cover assembly. In some application scenarios, the installation space of the motor is constrained, which requires limiting the axial length of the motor. This, in turn, requires limiting the length of the motor's cover assembly, which directly restricts the design of the axial length of the inductor. Consequently, the inductance value may not meet the design requirements, thus affecting the control effect on the motor's electromagnetic interference and failing to meet the automotive's electromagnetic compatibility (EMC) requirements for motors. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a cover assembly for a DC motor that can meet EMC requirements in a smaller volume, in light of the existing technology.

[0005] A cover assembly for a DC motor includes a cover component, a positive terminal plug, a negative terminal plug, a PCB control module, a positive inductor, a negative inductor, a positive brush component, and a negative brush component. The positive and negative terminal plugs are fixed to the cover component. The positive terminal plug is electrically connected to the PCB control module, the positive inductor is electrically connected to the PCB control module, the positive brush component is electrically connected to the positive inductor, the negative terminal plug is electrically connected to the PCB control module, the negative multilayer inductor is connected to the PCB control module to conduct current, the negative brush component is electrically connected to the inductor, and the positive and negative brush components are respectively slidably electrically connected to a commutator component on the motor armature component. The positive inductor consists of one or more layers of coils, and the negative inductor consists of one or more layers of coils.

[0006] Better still, the outermost coil is set to be a partially layered coil, which can be determined according to the length of the outermost coil, and better adapt to the different EMC requirements of DC motors of different specifications.

[0007] Better still, the cover is provided with multiple support bosses to limit the PCB control module axially in one direction. The PCB control module is then fixed by connecting square holes to the connection ends of the positive and negative plugs, respectively, and current is conducted through soldering. This also limits the PCB control module axially in another direction, making the PCB control module more reliably fixed.

[0008] Better still, the cover is provided with positive elastic fixing holes for multi-lobed springs arranged at intervals along the circumference and negative elastic fixing holes for multi-lobed springs arranged at intervals along the circumference. The positive inductor and the negative inductor are respectively inserted into the positive elastic fixing holes and the negative elastic fixing holes to facilitate the installation of the positive inductor and the negative inductor.

[0009] Even better, the positive electrode plug is provided with a positioning boss and a riveting boss, which limit the positive electrode plug on the cover to prevent axial loosening of the positive electrode plug.

[0010] Even better, the negative electrode plug is provided with a positioning boss and a riveting boss, which limit the positive electrode plug on the cover to prevent the negative electrode plug from becoming axially loose.

[0011] Compared with the prior art, the advantages of this utility model are as follows: when the length of the motor cover assembly is limited and the axial length of the inductor is restricted, by designing both the positive and negative inductors as inductors with more than one layer, the inductance can be increased by increasing the number of coil layers and turns while keeping the inductor length unchanged, thereby increasing the inductance to meet EMC requirements and satisfy the needs of application scenarios with restrictions on the axial length of the motor. Attached Figure Description

[0012] Figure 1 This is a perspective view of a cover assembly for a DC motor according to an embodiment of the present invention.

[0013] Figure 2 This is an exploded view of a cover assembly of a DC motor according to an embodiment of the present invention.

[0014] Figure 3 This is a schematic diagram of the positive multilayer inductor of a cover assembly of a DC motor according to an embodiment of the present invention.

[0015] Figure 4 This is a schematic diagram of the negative multilayer inductor of a cover assembly of a DC motor according to an embodiment of the present invention. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1-4 As shown, a cover assembly for a DC motor includes a cover 901, a positive terminal plug 100, a negative terminal plug 110, a PCB control module 40, a positive multilayer inductor 120, a negative multilayer inductor 130, a positive brush component 70, and a negative brush component 80.

[0018] The cover 901 has a square hole A9012 for fixing the positive electrode plug 100. The positive electrode plug 100 has a positive electrode positioning boss 1001 and a positive electrode riveting boss 1002. The positive electrode plug 100 is inserted into the square hole A9012. The bottom surface of the square hole A9012 is limited by the positive electrode positioning boss 1001, and the top surface of the square hole A9012 is limited by the riveted boss of the positive electrode riveting boss 1002 (see...). Figure 1 This ensures that the positive electrode plug 100 is firmly fixed to the cover 901 and prevents axial loosening.

[0019] like Figure 2 As shown, in this embodiment, there are two positive electrode positioning bosses 1001, one on the left and one on the right, which are respectively disposed on the two sides of the positive electrode plug 100, and there are two positive electrode riveting bosses 1002, one on the left and one on the right, which are respectively disposed on the two sides of the positive electrode plug 100.

[0020] Similarly, the cover 901 is provided with a square hole B9014 for fixing the negative electrode plug-in 110. The negative electrode plug-in 110 is provided with a negative electrode positioning boss 1101 and a negative electrode riveting boss 1102. The negative electrode plug-in 110 is inserted into the square hole B9014. The bottom surface of the square hole B9014 is limited by the negative electrode positioning boss 1101, and the top surface of the square hole A9012 is limited by the riveting boss 1102 (see...). Figure 1 This ensures that the negative electrode plug 110 is firmly fixed to the cover 901 and does not loosen axially.

[0021] like Figure 2 As shown, in this embodiment, there are two negative electrode positioning bosses 1101, one on the left and one on the right, which are respectively disposed on the two sides of the negative electrode plug 110. There are two negative electrode riveting bosses 1102, one on the left and one on the right, which are respectively disposed on the two sides of the negative electrode plug 110.

[0022] The cover 901 is provided with multiple support bosses 9013, which axially limit the PCB control module 40 in one direction. The PCB control module 40 is then fixed by connecting square holes A401 and B402, which respectively engage with the connecting ends 1003 of the positive plug 100 and 1103 of the negative plug 110. Current conduction is achieved through soldering, further axially limiting the PCB control module 40 in another direction, making the fixation of the PCB control module 4011 more reliable. The cover 901 is provided with elastic fixing holes A9011 and B9015, which are spaced apart circumferentially with multiple leaf springs. The positive multilayer inductor 120 and the negative multilayer inductor 130 are inserted into the elastic fixing holes A9011 and B9015, respectively, facilitating assembly and ensuring reliable fixation of the positive and negative multilayer inductors 120 and 130.

[0023] The connection terminals A1201 of the positive multilayer inductor 120 and A1301 of the negative multilayer inductor 130 respectively mate with the connection holes A403 and B404 provided in the PCB control module 40, and are electrically connected to the PCB control module 40 by soldering.

[0024] The connection terminals B1203 of the positive inductor 120 and B1303 of the negative inductor 130 are respectively connected to the positive brush braid 701 of the positive brush component 70 and the negative brush braid 801 of the negative brush component 80 through spot welding to achieve current conduction.

[0025] During motor operation, current flows in from the positive terminal plug, passes through the PCB control module, positive multilayer inductor, positive brush component, commutator component, armature winding, commutator component, negative brush component, negative multilayer inductor, and PCB control module, and then flows out from the negative terminal plug, forming a complete circuit. This allows for the control and reduction of electromagnetic interference generated by the motor, meeting the electromagnetic interference level requirements for motors in automobiles and eliminating potential driving safety hazards.

[0026] In this embodiment of the invention, the positive multilayer inductor 120 and the negative multilayer inductor 130 are respectively provided with three layers of coils on the positive core column 1202 and the negative core column 1302, namely the first layer coil I, the second layer coil II and the third layer coil III.

[0027] For motors used in different applications, the EMC requirements will vary. Different coil layers can be selected according to different needs. The outermost coil can also be set to a coil with no full layer, that is, a coil of any length, such as one-third layer, one-half layer, or two-thirds layer, to obtain a larger inductance value to meet different EMC requirements.

Claims

1. A cover assembly for a DC motor, characterized in that: The device includes a cover assembly, a positive terminal plug, a negative terminal plug, a PCB control module, a positive inductor, a negative inductor, a positive brush assembly, and a negative brush assembly. The positive and negative terminal plugs are fixed to the cover assembly. The positive terminal plug and the positive inductor are electrically connected to the PCB control module. The positive brush assembly and the positive inductor are electrically connected to the positive inductor. The negative terminal plug and the PCB control module are connected to conduct current. The negative brush assembly and the inductor are electrically connected. The positive and negative brush assemblies are slidably electrically connected to the commutator assembly on the motor armature assembly. The positive inductor consists of one or more layers of coils, and the negative inductor consists of one or more layers of coils.

2. The cover assembly of the DC motor as described in claim 1, characterized in that: The outermost coil is configured as a non-full-layer coil.

3. The cover assembly of the DC motor as described in claim 1, characterized in that: The cover is provided with multiple support bosses to limit the PCB control module axially in one direction. The PCB control module is then fixed to the positive and negative plugs through the connecting square holes, and current is conducted through soldering. The cover also limits the PCB control module axially in another direction.

4. The cover assembly of the DC motor as described in claim 1, characterized in that: The cover is provided with positive elastic fixing holes for multiple petal springs arranged at intervals along the circumference and negative elastic fixing holes for multiple petal springs arranged at intervals along the circumference. The positive inductor and the negative inductor are respectively inserted into the positive elastic fixing holes and the negative elastic fixing holes.

5. The cover assembly of the DC motor as described in claim 1, characterized in that: The positive electrode plug is provided with a positioning boss and a riveting boss, which limit the positive electrode plug on the cover.

6. The cover assembly of the DC motor as described in claim 1, characterized in that: The negative electrode plug is provided with a positioning boss and a riveting boss, which limit the positive electrode plug on the cover.

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