Planar High-Torque Motor Using Magnetic Compression Drive
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Solution Overview
Problem
Current high torque motors, whether hydraulic or electric, are often bulky, sensitive to mechanical shock, require frequent maintenance, or rely on hydraulic fluid, limiting their application in rugged environments without hydraulic fluid access.
Innovation Solution
A compact high torque density electric motor design featuring a stator with electromagnets and a rotor connected by a spherical bearing, where electromagnetic activation causes compression that translates into tangential thrust and rotation, utilizing a planar or conical relationship between traction components and incorporating rolling elements and teeth for efficient torque transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydraulic motors are used to achieve high torque density, then torque output is improved, but reliability deteriorates due to frequent seal failure and maintenance requirements
Solution Approach 1:
The patent replaces the hydraulic fluid-based mechanical system with an electromagnetic system. Electromagnets generate magnetic fields that directly actuate the rotor without requiring hydraulic seals or fluid, eliminating the primary source of maintenance issues while maintaining high torque output capability
Solution Approach 2:
The patent eliminates the need for hydraulic fluid by using electromagnetic fields directly. The electromagnets create magnetic pressure and force through field interaction with the rotor's magnetic components, replacing the hydraulic fluid's role as both actuator and cooling medium
2Duration of action of stationary object
If electric gear motors are used to achieve high torque, then service life is improved, but device complexity increases due to gearbox components
Solution Approach 1:
The patent extracts and removes the gearbox component entirely from the motor system. By designing the electromagnet-rotor interaction to directly produce high torque through magnetic compression and tangential thrust, the need for mechanical gear reduction is eliminated, simplifying the overall device structure
Solution Approach 2:
The patent transitions from traditional linear/rotational mechanical force transmission to a planar magnetic field interaction. The electromagnetic force acts in multiple dimensions simultaneously (compression normal to the plane and tangential thrust for rotation), achieving gear-like torque multiplication without mechanical gears
3Volume of moving object
If rolling rotor reluctance motors are used to achieve compact design, then volume is reduced, but torque transfer consistency deteriorates due to eccentric rotation and vibrations
Solution Approach 1:
The patent employs a spherical bearing to support the rotor at a fixed pivot point, ensuring consistent geometric relationships between stator and rotor components. This spherical geometry maintains stable alignment and uniform gap distances during rotation, eliminating the eccentricity and vibration problems of traditional rolling rotor designs
Solution Approach 2:
The patent changes the operational parameters by using electromagnetic compression to dynamically control the gap between stator and rotor components. This active parameter control ensures consistent magnetic coupling and stable torque transfer, replacing the passive mechanical tolerance stacking of traditional designs
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 motor achieves reliable high torque density without hydraulic fluid, offering a compact and rugged design with reduced maintenance needs, suitable for environments where hydraulic fluid is unavailable.
Implementation Method 1
a circuit configured to electromagnetically activate at least one pole of a first magnetic component; wherein electromagnetic activation causes the change in the gap resulting in compression of the first magnetic component and the second magnetic component about the pivot point defined by the spherical bearing
Implementation Method 2
compression is translated into tangential thrust via mechanical communication of the first traction component and second traction component
Data Source
AI summary
A motor includes: a stator having a plurality of electromagnets and a plurality of rolling elements arranged around the electromagnets; and a rotor having a plurality of rotor traction components arranged to engage the plurality of rolling elements; and a control circuit. The plurality of rolling elements are arranged relative to the plurality of rotor traction components to form a gap between the plurality of rolling elements and the plurality of rotor traction components. The control circuit is configured to activate the plurality of electromagnets to cause the rotor to pivot about a pivot point defined in a spherical bearing and change the gap such that the rotor compresses against the stator and the plurality of rolling elements and the plurality of rotor traction components translate the compression into tangential thrust and rotation of the rotor.