Segmented Rotor Motor Control for High-Speed Electric Tools
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Solution Overview
Problem
Existing electric tools with motors struggle to achieve high-speed rotation efficiently under light loads, which affects work efficiency.
Innovation Solution
An electric tool design featuring a motor with a rotor and stator configuration that includes a plurality of segments allowing magnetic flux adjustment, a magnetic clutch, and a controller for drive control, enabling increased rotor speed under light loads by autonomically changing magnetic flux and reducing magnetic flux absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotor rotates at high speed under light load, then work efficiency is improved, but magnetic flux is lost
Solution Approach 1:
The rotor is divided into a plurality of segments that can rotate relatively to each other, making the rotor structure dynamic rather than fixed. This allows the magnetic flux to be adjusted according to the load conditions, enabling high-speed rotation under light load while maintaining magnetic flux efficiency under heavy load.
Solution Approach 2:
The relative rotation of rotor segments changes the magnetic flux output as a variable parameter. By controlling the relative positions of segments, the magnetic flux can be optimized for different operating conditions, resolving the contradiction between high-speed operation and magnetic flux loss.
2Speed
If the rotor segments rotate relatively to change magnetic flux, then rotor speed increases under light load, but device complexity increases
Solution Approach 1:
The rotor is divided into a plurality of segments that can rotate relatively to each other. This segmentation allows the magnetic flux to be adjusted by the relative movement of segments, enabling speed control under light load while keeping each segment structurally simple.
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 allows for high work efficiency by maintaining magnetic flux efficiency and reducing failures, enabling the rotor to rotate at increased speeds under light loads without loss of magnetic flux.
Implementation Method 1
a magnetic flux output from the rotor changes
Data Source
AI summary
A motor includes a stator and a rotor. The stator has a coil unit and an iron core. The coil unit includes a plurality of coils and an insulator. The iron core includes a plurality of teeth. The rotor has a permanent magnet. The rotor is provided on an inner side of the stator to be rotatable around a shaft as a center with a gap being provided between the stator and the rotor. The rotor includes a plurality of segments divided in a rotation axis direction, the plurality of segments being rotatable relatively to each other such that a magnetic flux output from the rotor changes.