Hedge Trimmer Motor Geometry for Longer Battery Runtime
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Solution Overview
Problem
Hedge trimmers with battery power sources suffer from inefficient motors leading to short battery life, necessitating frequent charging or replacement, making them inconvenient to use.
Innovation Solution
A hedge trimmer design featuring a motor with a specific diameter-to-stack length ratio, enhanced transmission mechanism, and optimized blade assembly to reduce power loss, along with a battery pack that provides efficient energy supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a motor with conventional dimensions is used, then the motor structure is simple, but the motor efficiency is poor resulting in short battery life
Solution Approach 1:
The patent applies parameter changes by optimizing the motor's geometric dimensions, specifically setting the outer diameter between 45-70mm and the stack length between 20-35mm, with a diameter-to-stack-length ratio between 1.7-3.0. These specific parameter ranges improve motor efficiency and reduce power consumption while maintaining a relatively simple structure that can be integrated into existing hedge trimmer designs.
2Duration of action of moving object
If the battery capacity is increased to extend battery life, then the battery life is extended, but the weight of the hedge trimmer increases
Solution Approach 1:
The patent employs periodic action through the transmission mechanism consisting of a crank-con rod-connecting rod assembly that converts rotational motion to reciprocating motion of the blade. This mechanical optimization improves overall system efficiency, allowing the battery to last longer without needing to increase battery capacity and weight.
Solution Approach 2:
By optimizing motor parameters (outer diameter 45-70mm, stack length 20-35mm, diameter-to-stack-length ratio 1.7-3.0), the patent reduces power consumption, which directly extends battery life without requiring an increase in battery capacity or weight.
3Productivity
If the motor power is increased to improve trimming performance, then the trimming performance is improved, but the power consumption increases reducing battery life
Solution Approach 1:
The patent optimizes motor parameters to achieve the right balance between power output and efficiency. By setting the outer diameter between 45-70mm, stack length between 20-35mm, and diameter-to-stack-length ratio between 1.7-3.0, the motor delivers sufficient trimming performance while maintaining high efficiency and low power consumption.
Solution Approach 2:
The transmission mechanism with crank-con rod-connecting rod converts continuous rotational motion into periodic reciprocating motion of the blade, which matches the cutting requirement and improves energy utilization efficiency, maintaining high productivity with lower power consumption.
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
The design extends battery life, reduces power consumption, and enhances operational efficiency, making the hedge trimmer more convenient to use by minimizing the need for frequent charging.
Implementation Method 1
a motor disposed in the housing and configured to drive the hedge trimmer to work
Data Source
AI summary
A hedge trimmer includes a body including a housing; a power device including a motor disposed in the housing and configured to drive the hedge trimmer to work; and a battery pack for providing energy for the motor. The motor includes a stator and a rotor, an outer diameter of the motor is greater than or equal to 45 mm and less than or equal to 70 mm, the stator includes a core formed by multiple laminations stacked, the core has a stack length in a direction in which the laminations are stacked, the stack length of the stator is greater than or equal to 20 mm and less than or equal to 35 mm, and the ratio of the outer diameter of the motor to the stack length is greater than or equal to 1.7 and less than or equal to 3.