Interdigitated Comb Actuator Locking for Higher Driving Power
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Solution Overview
Problem
Existing electromechanical microsystems face limitations in motor power generation due to spacing constraints imposed by engraving techniques, which restrict the spacing between comb fingers.
Innovation Solution
The design incorporates a locking mechanism that allows the comb fingers to be initially spaced greater than or equal to the minimum predefined spacing during manufacturing, but then engages them closer together once locked, reducing spacing to less than the minimum, thereby increasing motor power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the spacing between comb fingers is reduced to increase motor power, then the driving power generated by the interdigitated combs increases, but the engraving technique cannot guarantee good separation of the parts
Solution Approach 1:
The patent applies preliminary action by performing the engagement action in advance during the manufacturing process. The comb fingers are positioned and engaged with their mating components before the final engraving step, ensuring that the engraving tool can access and separate all parts effectively. This preliminary positioning resolves the contradiction by allowing close spacing (for high power) while maintaining manufacturability through pre-established geometric relationships that guide the engraving process.
Solution Approach 2:
The patent segments the manufacturing process into distinct phases: a first engraving phase that creates initial spacing and separation, followed by a second engraving phase that reduces spacing after parts are already engaged. This segmentation allows each engraving operation to focus on specific tasks, ensuring both part separation and final close spacing are achieved without conflict.
2Ease of manufacture
If the spacing between comb fingers is kept at or above the minimum predefined spacing, then good separation of parts is guaranteed during engraving, but the driving power generated by the interdigitated combs is reduced
Solution Approach 1:
The patent uses preliminary action by establishing the engaged configuration of comb fingers before the final engraving operation. The fingers are positioned in their final close-spaced configuration during assembly, then a second engraving step reduces the spacing further while parts are already engaged. This ensures ease of manufacture in the first phase while achieving high power in the final configuration.
Solution Approach 2:
The patent applies dynamics by making the spacing between comb fingers variable during the manufacturing process. The spacing transitions from a larger initial value (facilitating separation) to a smaller final value (maximizing power). This dynamic adjustment of spacing resolves the contradiction between ease of manufacture and power generation.
3Power
If a two-stage engraving process is used to first separate parts then engage them closer together, then the number of engraving steps increases, but the final spacing can be reduced below the minimum predefined spacing
Solution Approach 1:
The patent segments the engraving process into two distinct stages: a first engraving phase that ensures part separation with adequate spacing, and a second engraving phase that reduces spacing after engagement. This segmentation, while increasing the number of steps, allows each phase to be optimized independently, making the overall process manageable and systematic rather than attempting a single complex engraving operation.
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 approach enhances motor power generation by reducing the spacing between comb fingers, overcoming the limitations imposed by engraving techniques, and maintaining the reduced spacing throughout the actuator's functioning.
Implementation Method 1
During the drive phase, the drive tooth is moved under the effect of electrostatic forces generated by the interdigitated combs
Implementation Method 2
During the disengagement phase, the drive tooth is moved in the opposite direction under the effect of elastic restoring forces generated by suspensions of the interdigitated combs
Data Source
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AI summary
The invention relates to an electromechanical microsystem, comprising a stand and an actuator, the actuator comprising a drive module comprising: - a fixed drive portion (210) fixedly mounted to the stand and comprising a stationary comb (211) with fingers (213); - a movable drive portion (220) mounted so as to move relative to the stand and comprising a movable comb (221) with fingers (223); - a locking mechanism movable between an initial unlocked configuration and a final locked configuration; and wherein the movable comb (221) is arranged opposite the fixed comb (211) so that, when the locking mechanism is in the initial unlocked configuration, the fingers (223) of the movable comb (221) are not engaged between the fingers (213) of the fixed comb (211) and, when the locking mechanism is in the final locked configuration, the fingers (223) of the movable comb (221) are engaged between the fingers (213) of the fixed comb (211) and the locking mechanism (500) prevents the fingers (223) of the movable comb (221) being disengaged from between the fingers (213) of the fixed comb (211).