Offset-Rotor Magnetic Torsional Spring for Linear Torque Range
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Solution Overview
Problem
Existing rotary magnetic couplings exhibit a small linear region of torque response relative to angular displacement, limiting their effectiveness in applications requiring a wide operating region with linear torque counterbalance.
Innovation Solution
A magnetic torsional spring design featuring multiple rotor sections with circumferentially offset magnets, providing a linear torque response through the combination of torque responses from each section, extending the linear operating region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional rotary magnetic coupling design is used, then torque transfer capability is achieved, but the linear region of torque response is small
Solution Approach 1:
The magnetic coupling is divided into multiple rotor sections (first rotor section, second rotor section, etc.) with each section having magnets arranged at different circumferential offsets. This segmentation allows each section to contribute a portion of the total torque response, and by combining these offset sections, the patent achieves an extended linear operating region that would not be possible with a single unified rotor design.
2Adaptability or versatility
If multiple rotor sections with offset magnets are used, then linear torque response region is extended, but device complexity increases
Solution Approach 1:
Multiple rotor sections are combined within a single magnetic coupling assembly, with each section contributing to the overall torque response. The sections are merged into a unified structure that shares common stator and rotor components, allowing the complex linear torque response to be achieved while maintaining reasonable structural integration and manufacturability.
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 achieves a significantly wider linear torque response, enabling effective counterbalance of spring forces with high linearity and torque capacity, suitable for applications requiring linear movement control.
Implementation Method 1
The magnets form North and South magnetic poles that interact with each other to attract or repel depending on the relative polarity. The magnetic interaction causes the driven rotor to rotate, generating rotary torque
Implementation Method 2
transfer rotary motion through magnetically generated torque across a radial gap without contact
Implementation Method 3
The method of torque generation is partly dependent on a change of reluctance of the magnetic circuit, hence the greater the number of poles, the greater the number of N-S interfaces and therefore the greater the change in reluctance as the inner and outer rotors have rotational motion relative to the other
Data Source
AI summary
A system and method with a torque response linearly proportional to angular displacement between inner and outer rotors having magnets, forming magnetic poles, to provide a linear magnetic torsional spring with a wide operating region. Multiple rotor sections of magnetic poles in at least one of the inner and outer rotors are provided wherein at least one rotor section of magnets is circumferentially offset by an offset angle from at least one other rotor section of magnets. The magnetic torsional spring can produce linear torque T, where T=+/−k θ, k is the angular spring constant, and θ is the angular displacement. The torque responses from each rotor section can cause a combined torque response to function as the linear magnetic torsional spring. The extended linear portion can provide a useful radial angle of rotation for a linear torque to counteract a spring force applied to the rotor.