Electromagnetic Clamping Inchworm Motor for High Load Precision
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Solution Overview
Problem
Inchworm motion linear motors developed using intelligent materials fail to fully display high-output stress performance due to limited anti-extrusion capability of brittle piezoelectric materials, making them unsuitable for super-large load driving and transmission applications.
Innovation Solution
An inchworm motion linear motor utilizing an electromagnetic clamping device with magnetic field generation devices, rolling bodies, and an output shaft, where the clamping mechanism is controlled electromagnetically to achieve sensitive locking and releasing states, enabling the motor to handle super-large loads and precise movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If piezoelectric materials are used for clamping mechanism, then clamping function is achieved, but anti-extrusion capability is limited and over clamping force crushes the material
Solution Approach 1:
The patent replaces the piezoelectric mechanical clamping mechanism with an electromagnetic clamping mechanism. The electromagnetic coil generates a magnetic field that attracts the armature plate, creating clamping force through electromagnetic interaction rather than mechanical piezoelectric deformation. This substitution eliminates the material strength limitations of piezoelectric ceramics while maintaining the clamping function.
Solution Approach 2:
The patent changes the fundamental operating parameter from piezoelectric strain (mechanical deformation) to electromagnetic force (magnetic field interaction). By using an electromagnetic coil and armature plate system, the clamping force is generated through magnetic attraction, allowing for higher force levels without the risk of crushing the actuator material itself.
2Force
If electromagnetic clamping mechanism is used, then super-large load driving capability is achieved, but device complexity increases
Solution Approach 1:
The electromagnetic clamping mechanism serves multiple functions: it provides both the clamping force and the driving force for the inchworm motion. The same electromagnetic coil that creates clamping force also drives the armature plate to move, eliminating the need for separate driving and clamping mechanisms. This multi-functionality reduces overall device complexity despite the advanced electromagnetic components.
Solution Approach 2:
The patent merges the driving mechanism and clamping mechanism into a single integrated electromagnetic system. The electromagnetic coil simultaneously performs both functions, and the armature plate serves as both the driven element and the clamping element. This consolidation reduces the number of separate components and simplifies the overall mechanism.
3Manufacturing precision
If piezoelectric materials are used, then precise telescopic deformation is achieved, but energy density is limited
Solution Approach 1:
The patent changes the energy storage and conversion mechanism from piezoelectric energy storage (which has limited energy density) to electromagnetic energy conversion (which offers higher energy density). The electromagnetic coil can store and release significantly more energy per unit volume compared to piezoelectric materials, while still achieving precise control through electrical signal modulation.
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 electromagnetic clamping mechanism allows for a high clamping force with low energy consumption, enabling the motor to be applied in various fields requiring large-displacement and high-precision driving, improving the utilization of electrostrictive and magnetostrictive driving materials.
Implementation Method 1
An electromagnetic coil is respectively arranged on the two outer end surfaces of the shell body... When the electromagnetic coil on the left end surface of the shell body is electrified, the rolling bodies in a free state are absorbed on one side of the inner wall which is close to the shell body due to magnetic attraction
Implementation Method 2
two permanent magnetic bodies which are respectively arranged on both sides of the shell body... the rolling bodies are made of ferromagnetic materials or ferromagnetic-nonferromagnetic composite materials
Implementation Method 3
the rolling bodies are clamped between the output shaft and the inner walls of the upper side and the lower side of the shell body... when the output shaft is dragged to move to the left, the output shaft drives the rolling bodies under the action of friction force
Data Source
AI summary
An inchworm motion linear motor based on an electromagnetic clamping device in a technical field of electromagnetic motors includes more than two electromagnetic clamping mechanisms which are arranged in pairs and mutually symmetrically connected. The electromagnetic clamping mechanism includes magnetic field generation devices, rolling bodies, an output shaft and a shell body, wherein the magnetic field generation devices are fixedly arranged outside the shell body; and the shell body and the rolling bodies are sleeved outside the output shaft in sequence. The inchworm motion linear motor based on the electromagnetic clamping device can be manufactured into an electric control super-large clamping force device by sensitively controlling mechanical rigid locking and releasing states with electromagnetically. The clamping device can be manufactured into a driving device or the linear motor with super-large load and precise movement.