Magnetic Drive Devices With Free-Spinning Interpole Elements
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Solution Overview
Problem
Conventional magnetic drive devices, such as permanent magnet motors and generators, face limitations in torque and voltage output due to magnetic and electrical stress constraints, and often require mechanical-transmission elements, which can lead to inefficiencies and increased noise.
Innovation Solution
The introduction of free-spinning interpole elements positioned between the stator and rotor, which harmonically couple the magnetic pole pairs to amplify the magnetomotive force and increase torque or voltage output, allowing for reduced magnet volume and variable speed operation at fixed frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional magnetic drive devices are used, then the structure is simple, but the torque and voltage output are limited due to magnetic and electrical stress constraints
Solution Approach 1:
The patent introduces harmonic coupling elements as intermediaries between the stator and rotor. These elements mediate the magnetic interaction by creating harmonic relationships between different pole pairs, enabling torque multiplication without directly increasing the magnetic stress on the stator windings. The harmonic coupling elements act as a magnetic gearbox, transforming the magnetic field interactions to achieve higher torque output.
Solution Approach 2:
The patent changes the magnetic field parameters by utilizing harmonic relationships between different pole pairs. By adjusting the number of pole pairs on the stator and rotor to be different and creating harmonic coupling between them, the system achieves torque multiplication. This parameter change allows the device to operate beyond conventional magnetic stress limits through resonant harmonic interactions.
2Power
If the number of magnetic pole pairs is increased to boost torque output, then the torque increases, but the magnet volume and device complexity increase
Solution Approach 1:
The harmonic coupling elements serve as intermediaries that enable torque multiplication without requiring proportional increases in magnet volume. These elements create harmonic relationships that amplify the torque output from the existing magnet configuration, achieving higher torque with the same or reduced magnet volume.
Solution Approach 2:
The patent utilizes periodic harmonic relationships between different pole pairs to achieve torque multiplication. By creating resonant harmonic interactions with specific periodic relationships between the stator and rotor pole pairs, the system amplifies torque output without requiring larger magnets, leveraging the periodic nature of magnetic field interactions.
3Power
If mechanical transmission elements are used to increase torque, then the torque output increases, but the noise and device complexity increase
Solution Approach 1:
The patent replaces mechanical transmission elements (gears, belts, etc.) with a magnetic field-based harmonic coupling mechanism. This substitution eliminates mechanical contact and associated noise while achieving torque multiplication through magnetic harmonic relationships. The magnetic coupling provides a non-contact, non-mechanical means of torque transmission.
Solution Approach 2:
The harmonic coupling elements act as magnetic intermediaries that replace mechanical transmission components. These intermediaries transmit torque through magnetic field interactions rather than mechanical contact, eliminating the noise generated by mechanical gears and bearings while maintaining torque multiplication capability.
4Volume of moving object
If the magnet volume is reduced to decrease device size, then the device becomes more compact, but the torque and voltage output decrease
Solution Approach 1:
The patent changes the operational parameters by utilizing harmonic relationships between different pole pairs. This allows the system to achieve higher torque output from reduced magnet volume by leveraging resonant harmonic interactions rather than relying solely on magnet size. The parameter change in pole pair configuration enables torque multiplication effect.
Solution Approach 2:
The patent employs periodic harmonic relationships to amplify the torque output from smaller magnets. By creating resonant interactions with specific periodic ratios between stator and rotor pole pairs, the system achieves torque multiplication that compensates for the reduced magnet volume, maintaining power output with more compact dimensions.
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 enhances torque and voltage output by up to 75% compared to conventional devices, reduces stator torque, and enables efficient direct-drive applications in industries like oil drilling with reduced mechanical components and noise.
Implementation Method 1
The interpole elements may produce a magnetomotive force and harmonically couple the magnetic pole pairs of the stator with the magnet pole pairs of the rotor
Implementation Method 2
a stator comprising a plurality of windings for generating a first number of magnetic pole pairs
Implementation Method 3
a rotor comprising a plurality of permanent magnets for generating a second number of magnetic pole pairs
Data Source
AI summary
A magnetic drive device may comprise a stator comprising a plurality of windings for generating a first number of magnetic pole pairs and a rotor comprising a plurality of permanent magnets for generating a second number of magnetic pole pairs that differs from the first number of magnetic pole pairs. The magnetic drive device may further comprise a plurality of free-spinning interpole elements disposed within an air gap between the stator and the rotor. The interpole elements may produce a magnetomotive force and harmonically couple the magnetic pole pairs of the stator with the magnet pole pairs of the rotor.