Motor Stator Core Fastening Structure for Electric Tool Noise Reduction
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Solution Overview
Problem
Electric work machines, such as driver drills, generate noise that can cause discomfort to operators and those nearby, primarily due to resonance in the stator core.
Innovation Solution
The electric work machine incorporates a stator core fastened to a bracket and a support using screws, which increases the rigidity of the stator core, thereby raising its resonant frequency and reducing noise through minimized resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the stator core is left unsupported, then the device complexity is reduced, but noise is generated due to resonance
Solution Approach 1:
The support structure is divided into a first support and a second support that are positioned at different locations (front and rear ends) of the stator core. These supports are connected via a connection portion, creating a segmented support system that reduces stator core resonance more effectively than a single support structure, thereby reducing noise without excessive complexity
Solution Approach 2:
The first support and second support are positioned at specific locations (front end and rear end respectively) of the stator core, providing localized support where needed. This targeted approach reduces resonance at critical points while maintaining overall structural efficiency and minimizing unnecessary complexity
2Object-affected harmful factors
If the stator core rigidity is increased, then resonant frequency is raised and noise is reduced, but the device complexity increases
Solution Approach 1:
The first support, second support, and connection portion are merged into an integrated support structure that acts as a unified component. This merged structure increases stator core rigidity and raises resonant frequency to reduce noise, while the integration minimizes the number of separate parts and assembly complexity
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 design effectively reduces noise by preventing the stator core from resonating, maintaining compactness and lightweight construction, and minimizing misalignment between the stator and rotor axes.
Implementation Method 1
a screw connecting the first support and the second support and fastening the stator core to the first support and the second support
Implementation Method 2
increases the rigidity of the stator core, thereby raising its resonant frequency and reducing noise through minimized resonance
Data Source
AI summary
An electric work machine reduces noise from the electric work machine. An electric work machine includes a motor including a stator including a stator core and coils, and a rotor including a rotor core and a rotor shaft, an output unit located frontward from the motor and rotatable with a rotational force from the motor, a first support having a first contact surface in contact with a front end face of the stator core, a second support having a second contact surface in contact with a rear end face of the stator core, and a screw connecting the first support and the second support and fastening the stator core to the first support and the second support in a front-rear direction.