Ambient Magnetic Field Motor With Orientation-Independent Torque
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Solution Overview
Problem
Existing electromagnetic motors are not operable in strong ambient magnetic fields, which limits their application in environments like MRI scanners where strong magnetic fields are present.
Innovation Solution
The development of an ambient magnetic field motor (AMFM) that can operate in strong ambient magnetic fields by using at least one rotor with a mechanical output shaft, where the rotor is induced to rotate by the ambient magnetic field in response to a selectively applied electrical current, generating an output torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing electromagnetic motors are used, then they can generate torque and rotational motion, but they cannot operate in strong ambient magnetic fields such as MRI scanners
Solution Approach 1:
The patent replaces the traditional electromagnetic motor system with a magnetically-driven rotor system. Instead of using electromagnetic coils to generate magnetic fields, the invention uses a rotor with permanent magnets that is directly driven by the ambient magnetic field. This substitution eliminates the conflict between motor operation and ambient magnetic field presence, allowing the motor to function reliably within MRI scanners and other environments with strong magnetic fields.
2Power
If a rotor is designed to rotate about an axis parallel to the ambient magnetic field, then it can generate torque, but the motor becomes orientation-dependent and cannot operate reliably when orientation changes
Solution Approach 1:
The patent divides the rotor into multiple segments with magnets arranged in alternating polarity patterns around the rotor circumference. This segmentation creates multiple magnetic interaction points with the ambient field, allowing torque generation from different orientations. The segmented design ensures that regardless of the rotor's angular position, there are always magnets positioned to interact effectively with the ambient magnetic field lines, maintaining consistent torque production across all orientations.
Solution Approach 2:
The patent implements local quality variations in the magnet arrangement around the rotor circumference, with alternating north and south poles positioned at specific angular intervals. This local differentiation of magnetic properties ensures that different portions of the rotor interact with the ambient field in complementary ways, maintaining torque generation capability across all rotational orientations while preventing orientation dependency.
3Adaptability or versatility
If multiple rotors are used to maintain consistent torque constant across orientations, then orientation independence is achieved, but device complexity increases
Solution Approach 1:
The patent merges multiple magnetic interaction functions into a single rotor structure. By arranging magnets in alternating polarity patterns around one rotor, the design achieves the torque consistency that would otherwise require multiple rotors. The merged design combines the functions of multiple segmented magnets with alternating polarities into a unified rotor assembly, reducing mechanical complexity while maintaining orientation-independent torque generation.
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 AMFM maintains a consistent torque constant across various orientations within the strong ambient magnetic field, enabling reliable operation in MRI-compatible robotic systems and allowing for diagnostic applications that require actuators near the patient.
Implementation Method 1
the rotor is induced to rotate by the ambient magnetic field in response to a selectively applied electrical current through the rotor
Implementation Method 2
the rotor is induced to rotate by the ambient magnetic field in response to a selectively applied electrical current through the rotor, such that the rotor generates an output torque
Data Source
AI summary
Apparatus and associated methods relate to an ambient magnetic field motor (AMFM) operable in a strong ambient magnetic (e.g., electromagnetic) field (AMF) having at least one rotor, each with respective shafts extending a corresponding rotation axis. The motor may, for example, be activated in response to the AMF to generate an output torque. In an illustrative example, the motor may, for example, include a mechanical output shaft mechanically coupled to the at least one rotor. For example, the mechanical output shaft may, for example, extend along a longitudinal axis intersecting at least one corresponding rotation axis of the at least one rotor. For example, in an AMF, the at least one rotor may, for example, be induced to rotate by the AMF in response to a selectively applied electrical current to generate an output torque at the mechanical output shaft about the longitudinal axis. Various embodiments may, for example, advantageously provide an electromagnetic motor operable in a strong AMF.