Core Drill Motor Layout for High Torque and Lower Heat
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Solution Overview
Problem
Existing core drills face challenges with high heat generation and weight imbalance, particularly in motor configurations and battery pack arrangements.
Innovation Solution
The core drill design incorporates a large stator diameter and length, combined with a speed-reducing mechanism and dual battery-mounting parts, to enhance torque and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the motor is designed to provide high output torque, then the torque capability is improved, but heat generation increases
Solution Approach 1:
The patent increases the stator outer diameter to 75mm or more and stator length to 30mm or more, transitioning from conventional smaller dimensions. This dimensional change allows the motor to generate high torque through increased electromagnetic interaction area while distributing heat generation over a larger volume, thereby reducing temperature rise despite high torque output capability
2Power
If a single large battery pack is used to power the motor, then sufficient power is provided, but weight balance deteriorates
Solution Approach 1:
The patent divides the battery power supply into multiple separate battery packs instead of using a single large battery pack. Each battery pack has a rated voltage of 40V or more, and multiple packs are connected in series to achieve the required total voltage. This segmentation distributes the weight across different locations on the tool body, improving weight balance and ergonomics while maintaining sufficient power supply capability for high torque motor operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces motor heat generation while maintaining high torque and improves weight balance, allowing for efficient and ergonomic use.
Implementation Method 1
a motor (8) comprising a stator (81) and a rotor (82), which rotates relative to the stator (81)
Data Source
AI summary
A core drill includes: a motor having a stator and a rotor, which is rotatable relative to the stator; a speed-reducing mechanism; an output shaft that, in the state in which a core bit is mounted thereon, is rotated by the rotational force of the rotor transmitted via the speed-reducing mechanism; and a battery-mounting part, on which a battery pack is mounted. A stator outer diameter, which is the outer diameter of a stator core of the stator, is 75 mm or more; and a stator length, which is the dimension of the stator core in an axial direction, is 30 mm or more.