Power Capacitor Spring Pad Vibration Damping
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Solution Overview
Problem
Existing power capacitors are not effectively protected against vibrations, which can lead to instability and interference in electronic systems, particularly in applications like motor vehicles.
Innovation Solution
A power capacitor design featuring a mechanically resilient element, such as a plastic foam 'spring pad' with gas-filled closed cells, is integrated between the capacitor winding and housing to absorb volume expansion and dampen vibrations, ensuring a constant capacitance and improved electromagnetic compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid mechanical fixing is used to secure the capacitor winding in the housing, then the capacitor winding is firmly positioned, but vibrations are transmitted and cause instability and interference in electronic systems
Solution Approach 1:
The patent applies beforehand cushioning by introducing a mechanically resilient element (spring element) between the capacitor winding and the housing before vibrations occur. This spring element absorbs and dampens vibrations beforehand, preventing them from being transmitted to the capacitor winding and causing instability or interference in electronic systems.
Solution Approach 2:
The patent uses an intermediary approach by placing a spring element as a mediator between the capacitor winding and the housing. This spring element acts as a cushioning intermediary that decouples the rigid connection, allowing the capacitor winding to be securely positioned while preventing vibration transmission to the housing and other components.
2Stability of the object's composition
If the capacitor winding is tightly fixed in the housing, then the capacitance remains constant, but thermal expansion causes stress and potential damage to the capacitor structure
Solution Approach 1:
The patent applies dynamics by replacing a rigid fixed connection with a dynamically adaptable spring element. This spring element can elastically deform to accommodate thermal expansion of the capacitor winding while maintaining electrical connection and capacitance stability, thus preventing structural damage from thermal stress.
Solution Approach 2:
The patent uses parameter changes by allowing the spring element to change its compression state in response to thermal expansion. As temperature increases and the capacitor winding expands, the spring element compresses accordingly, maintaining constant capacitance while accommodating the dimensional changes without causing structural damage.
3Object-affected harmful factors
If a solid resilient element is used to absorb vibrations, then vibration damping is achieved, but material fatigue occurs over time reducing service life
Solution Approach 1:
The patent applies pneumatics by using a spring element with closed-cell foam structure containing gas-filled pores. The gas compression and decompression within the closed cells provides resilient behavior that dampens vibrations while being highly insensitive to material fatigue, significantly extending the service life compared to solid resilient materials.
Solution Approach 2:
The patent uses porous materials by employing a spring element made of closed-cell foam with gas-filled pores. This porous structure allows the material to absorb and dissipate vibration energy through gas compression while maintaining high resistance to material fatigue, ensuring long-term reliability and service life.
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 effectively absorbs thermal expansion and vibrations, maintaining a constant capacitance and enhancing electromagnetic compatibility by positioning the capacitor winding securely within the housing, thereby reducing the risk of interference and ensuring long-term resilience without material fatigue.
Implementation Method 1
the volume expansion of the capacitor winding can be absorbed when it is heated
Implementation Method 2
The spring properties are not primarily caused by the compression and decompression of a solid body, but rather by the closed gas bubbles and thus by the compression or decompression of a gas volume
Implementation Method 3
such a resilient element also has the advantage that vibrations, such as those that occur when operating a motor vehicle, can be damped
Implementation Method 4
The spring properties are not primarily caused by the compression and decompression of a solid body, but rather by the closed gas bubbles and thus by the compression or decompression of a gas volume
Data Source
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AI summary
The capacitor has a housing (1), capacitor windings (18a, 18b), and mechanical spring units (19a, 19b) arranged between the housing and the corresponding capacitor windings, where the spring units are formed as the spring-pad. The capacitor windings are designed based on metallized polymer multilayer winding technique. The dielectric of the capacitor windings is made of e.g. polyester, polypropylene. The thickness of the dielectric is 3 mu meter. Profiled insulation jackets are provided between the capacitor windings and the housing for mechanical fixation of the spring units.