Precautions for motor PCB assembly


Motor PCB (Printed Circuit Board) assembly is a key link in the motor manufacturing process. It involves multiple complex steps, including PCB design, component selection, welding, testing, etc.

During this process, a series of precautions need to be strictly followed to ensure that the assembled motor PCB can operate stably and reliably. This article will introduce in detail the precautions for motor PCB assembly to help readers better understand and master relevant knowledge.

Preparation for Motor PCB Assembly

Before assembling the motor PCB, the following preparations need to be made:

  1. PCB design: According to the functional requirements and performance requirements of the motor, design a PCB that meets the requirements. During the design process, factors such as circuit layout, component selection, and wiring methods need to be considered to ensure the stability and reliability of the PCB.
  2. Component procurement and screening: Purchasing appropriate electronic components according to the requirements of PCB design. When purchasing, you need to pay attention to the quality, performance, reliability and other aspects of components. At the same time, components also need to be screened to ensure that they meet the design requirements.
  3. Tool preparation: Prepare the required welding tools, test instruments, screwdrivers, etc. for use during the assembly process.

Precautions for motor PCB assembly

  1. Component layout and welding

(1) Component layout: When laying out components, the principle of nearby concentration should be followed, and components with the same function or interrelated components should be laid out together. At the same time, digital circuits and analog circuits should be laid out separately to reduce mutual interference. In addition, it is also necessary to note that components and devices must not be mounted within a certain range around non-installation holes such as positioning holes and standard holes to avoid affecting welding and assembly.

(2) Welding: Welding is a very critical step in the motor PCB assembly process. During the welding process, it is necessary to choose the appropriate welding method and welding temperature to ensure welding quality. At the same time, you also need to pay attention to the welding sequence, welding low components first and then welding tall components to avoid damage to the components due to stress generated during the welding process.

  1. Via processing

Vias in motor PCB are divided into through holes, blind holes and buried holes. When dealing with vias, you need to pay attention to the following points:

(1) Avoid placing via holes under horizontally mounted resistors, inductors (plug-ins), electrolytic capacitors and other components to avoid short circuiting between the via holes and the component housing after wave soldering.

(2) When necessary, ground wires can be added for isolation, and the wiring on adjacent layers should be perpendicular to each other to reduce parasitic coupling.

  1. Power supply and ground wire handling

(1) Add a decoupling capacitor between the power supply and ground to provide instant current to the chip and remove power supply noise.

(2) Widen the power supply and ground wires as much as possible. It is best to make the ground wire wider than the power wire and the power wire wider than the signal wire. You can use a large area of copper as a ground wire, or connect all unused areas on the printed circuit board to ground.

  1. Digital circuit and analog circuit processing

For motor PCBs containing digital circuits and analog circuits, attention needs to be paid to the mutual interference between them. Especially noise interference on the ground line requires corresponding measures to be isolated and filtered.

  1. Inspection and testing after welding

After the welding is completed, detailed inspection and testing are required to ensure that each component is welded correctly and there are no short circuits or open circuits. You can use multimeters, oscilloscopes and other tools for testing to ensure that the performance of the motor PCB meets the requirements.

  1. Common problems and solutions in motor PCB assembly
  2. Poor component welding: It may be caused by improper welding temperature and time control or oxidation of component pins. It can be solved by adjusting welding parameters, using flux, etc.
  3. Component damage: It may be caused by static electricity, welding stress, etc. It is necessary to pay attention to anti-static measures and welding sequence during operation.
  4. PCB board deformation: It may be caused by the stress generated during the welding process. It can be solved by optimizing the welding sequence and using clamps to fix the PCB board.


Motor PCB assembly is a complex and meticulous process that requires strict compliance with a series of precautions. Only with sufficient preparation, standardized operations, and careful inspection can we ensure that the assembled motor PCB operates stably and reliably. I hope this article can provide useful reference and assistance to readers in the motor PCB assembly process.

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