Dual-Motor Power Tool PCB Layout for Lower Weight and Height

Solution Overview

Problem

Existing electric power tools with integrated wireless communication devices suffer from increased weight and height, particularly when equipped with multiple electric motors and large-capacity batteries, leading to poor operability.

Innovation Solution

The electric power tool is designed with a first and second electric motor, a first and second controller, and circuit boards disposed around the motors, incorporating a communication device with separate batteries to reduce weight and height, and includes a configuration where circuit boards are positioned to minimize noise and heat interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a wireless communication device is mounted on a large-capacity battery to enable wireless communication functionality, then the communication function is achieved, but the battery weight increases and the overall tool height increases significantly

Engineering Contradiction:

Improvewireless communication functionVSAvoidbattery weight

Core Design Contradiction:

Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The patent divides the tool into two separate units: a main body unit containing the communication device and a battery unit containing the power source. This segmentation allows the communication device to be mounted without increasing battery weight, as the communication components are housed in the main body unit instead of being integrated into the battery pack.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a vertical stacking arrangement (communication device on top of battery) to a lateral separation arrangement (main body unit connected to battery unit via arm). This dimensional change enables the communication device to be positioned away from the battery, reducing both battery weight and overall tool height while maintaining functionality.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If a wireless communication device is mounted on a large-capacity battery to enable wireless communication functionality, then the communication function is achieved, but the overall tool height increases significantly

Engineering Contradiction:

Improvewireless communication functionVSAvoidtool height

Core Design Contradiction:

Adaptability or versatilityVSLength of stationary object

Solution Approach 1:

The patent divides the tool into two separate units: a main body unit containing the communication device and a battery unit containing the power source. This segmentation allows the communication device to be mounted without increasing battery weight, as the communication components are housed in the main body unit instead of being integrated into the battery pack.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from a vertical stacking arrangement (communication device on top of battery) to a lateral separation arrangement (main body unit connected to battery unit via arm). This dimensional change enables the communication device to be positioned away from the battery, reducing both battery weight and overall tool height while maintaining functionality.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Power

If multiple electric motors and a large-capacity battery are equipped to enhance tool functionality and power, then the tool performance is improved, but the battery weight increases

Engineering Contradiction:

Improvetool powerVSAvoidbattery weight

Core Design Contradiction:

PowerVSWeight of moving object

Solution Approach 1:

The patent separates the heavy battery unit from the main body unit containing the motors and communication device. The battery unit can be designed with optimized weight distribution and can be easily replaced or removed, allowing high power delivery without permanently increasing the operational weight of the main tool body during use.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12500486B2Electric power tool

Publication Date: 2025.12.16 MAX CO LTD

AI summary

There is provided an electric power tool including: a first electric motor and a second electric motor; a first controller configured to control the first electric motor and the second electric motor; a first circuit board on which the first controller is mounted; a communication device; a second controller configured to control the communication device; a second circuit board on which the second controller and an antenna of the communication device are mounted; and a housing configured to accommodate the first electric motor, the second electric motor, the first circuit board, the communication device, and the second circuit board. The first circuit board and the second circuit board are disposed around the first electric motor.