Electromagnetic Actuator Displacement Amplification Mechanism
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Solution Overview
Problem
Existing electromagnetic actuators experience a drastic decrease in thrust force with increasing displacement, leading to a wide range of thrust force variation, which complicates production and increases costs due to the need for high electric current and complex assembly processes.
Innovation Solution
Incorporating a displacement amplification mechanism into the electromagnetic actuator, utilizing a magnetic circuit with a displacement amplification ratio, which reduces the thrust force by half while amplifying displacement, thereby maintaining a consistent thrust force over a wider range and reducing the need for high electric current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If electromagnetic attraction force generation mechanism is used without displacement amplification, then thrust force is high at small displacement, but thrust force drastically decreases as displacement increases
Solution Approach 1:
A displacement amplification mechanism is introduced as an intermediary component between the electromagnetic actuator and the gripper. This mechanism amplifies the small displacement of the electromagnetic actuator while reducing the thrust force, allowing the system to achieve large gripper displacement with more stable thrust force characteristics throughout the motion range.
Solution Approach 2:
The system changes the displacement parameter through the displacement amplification mechanism. By using a displacement amplification ratio (e.g., 2:1), the mechanism transforms the electromagnetic actuator's small displacement into larger gripper displacement, while simultaneously transforming the thrust force parameter to remain more stable across the extended displacement range.
2Force
If high electric current is supplied to maintain thrust force at large displacement, then thrust force is sufficient, but device complexity and cost increase
Solution Approach 1:
The displacement amplification mechanism serves as a mechanical intermediary that provides thrust force transformation without requiring high electric current. This avoids the need for complex high-current electromagnetic actuators while maintaining sufficient thrust force at large displacements.
3Stability of the object's composition
If displacement amplification mechanism is integrated into electromagnetic actuator, then thrust force is stabilized over wider displacement range, but device complexity increases
Solution Approach 1:
The displacement amplification mechanism is merged with the electromagnetic actuator to form an integrated unit. This combination stabilizes the thrust force over a wider displacement range while keeping the overall device compact and manageable, avoiding the need for separate complex systems.
4Length of moving object
If displacement amplification ratio is used, then displacement is amplified and thrust force is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The displacement amplification mechanism uses a displacement amplification ratio (e.g., 2:1) to transform the electromagnetic actuator's small displacement into larger gripper displacement. While this requires certain manufacturing precision, the precision requirements are managed through careful design of the amplification mechanism's geometric parameters and assembly tolerances.
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 solution stabilizes thrust force over a broader displacement range, reduces the requirement for high electric current, and simplifies the production process by integrating the displacement amplification mechanism, resulting in a more efficient and cost-effective electromagnetic actuator.
Implementation Method 1
a coil (wiring) 6 provided in the displacement amplification mechanism 1A and generating a magnetic flux in the displacement amplification mechanism 1A
Implementation Method 2
an attraction force is generated and is applied from the attracting surfaces 102as, 102bs to the surface 106s1 of the movable iron piece 106 via the gap 105
Data Source
Figure 1(a)~1(b)
Figure 2~3
Figure 4(a)~4(c)
AI summary
There are provided a gripper mechanism and a movement mechanism which utilize an electromagnetic actuator which can secure a sufficient thrust force at least at a certain level over a wide range of displacement. The movement mechanism 30 includes a pair of electromagnetic actuators 21 F, 21 R disposed inside a pair of rails 35a, 35b, and an intermediate actuator 40 provided between the electromagnetic actuators 21 F, 21 R. The electromagnetic actuators 21 F, 21 R function as a gripper mechanism to be gripped by the rails 35a, 35b. The electromagnetic actuators 21 F, 21 R each include a displacement amplification mechanism 21A comprised of a magnetic body, and coils 26a, 26b, 26c, 26d provided in the displacement amplification mechanism 21A. A magnetic flux is generated in the magnetic body by passing an electric current through the coils 26a, 26b, 26c, 26d so as to displace the displacement amplification points L2x, L2y of the displacement amplification mechanism 21A.