Rotational Magnet Body Cogging Torque Reduction
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Solution Overview
Problem
Existing power generation input devices with batteryless designs face challenges in adjusting manipulation feeling due to high cogging torque, making it difficult to achieve desired maneuverability and user feedback.
Innovation Solution
A power generation input device with a rotational magnet body having N-pole and S-pole members, supported to rotate around a center line, and a magnetic member that sandwiches the magnet, with coils wound around the magnetic member, allowing the manipulation body to drive the rotation of the magnet body, and adjusting the inclination of the gap between the N-pole and S-pole ends to reduce cogging torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a magnet and coil are used to generate electric power during input manipulation, then energy self-sufficiency is achieved, but cogging torque increases making manipulation difficult
Solution Approach 1:
The patent applies asymmetry by positioning the N-pole member and S-pole member at different locations relative to the rotational center line, and by making the gap between pole ends extend in an inclined direction rather than parallel to the rotational center line. This asymmetric configuration creates a gradual change in magnetic field strength during rotation, reducing cogging torque while maintaining power generation capability
Solution Approach 2:
The patent implements dynamics by creating a movable gap configuration between the N-pole and S-pole members. The gap extends in an inclined direction relative to the rotational center line, causing the magnetic field interaction to dynamically change during rotation. This dynamic magnetic field variation smooths the torque characteristics and reduces cogging effects
2Power
If the magnetic field changes rapidly during rotation, then power generation efficiency increases, but cogging torque increases
Solution Approach 1:
The patent creates a dynamic magnetic field interaction through the inclined gap configuration between N-pole and S-pole members. As the rotational magnet body rotates, the gap distance between opposite poles gradually changes, producing a smooth and continuous magnetic field variation. This dynamic configuration maintains sufficient power generation while avoiding rapid field changes that cause cogging torque
Solution Approach 2:
The patent changes the geometric parameters of the magnetic circuit by extending the N-pole and S-pole ends in an inclined direction relative to the rotational center line. This parameter change creates a gradual variation in magnetic field strength during rotation, optimizing the balance between power generation efficiency and cogging torque reduction
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 solution allows for a power generation input device with adjustable cogging torque, enabling a desired manipulation feeling and improved maneuverability by gradually changing the magnetic field as the rotational magnet body moves, reducing the torque and enhancing user interaction.
Implementation Method 1
The magnet or coil is operated in response to the input manipulation, generating an induced electromotive force
Implementation Method 2
The N-pole member has an N-pole end, which extends in a direction more away from the rotational center line than the end of the magnet... the gap extending in a direction inclined with respect to the rotational center line
Data Source
AI summary
A power generation input device includes a rotational magnet body that has a magnet, an N-pole member placed near the N pole of the magnet, and an S-pole member placed near the S-pole of the magnet, the rotational magnet body being supported so as to be rotatable around a rotational center line; a magnetic member; coils; and a manipulation body. The N-pole member has an N-pole end, which extends in a direction more away from the rotational center line than the end of the magnet. The S-pole member has an S-pole end, which extends in a direction more away from the rotational center line than the end of the magnet. The N-pole end and S-pole end are oppositely disposed in a plane parallel to the rotational center line with a gap intervening between them, the gap extending in a direction inclined with respect to the rotational center line.