Detachable Compressor Inverter Assembly With Damper Weight
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Solution Overview
Problem
Motor-driven compressors with inverters face vibration issues due to resonance with internal combustion engine frequencies, leading to stress on solder connections and potential cracking, and conventional gel-based damping solutions are not suitable for removable inverters as they increase weight and production costs.
Innovation Solution
A motor-driven compressor design featuring a detachable inverter assembly with a damper weight made of potting material mounted on the substrate to shift resonance frequencies out of the engine vibration range, eliminating the need for gel-filled inverter chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration-damping gel is used to suppress substrate vibration, then vibration reduction is achieved, but the inverter assembly becomes non-detachable and weight increases
Solution Approach 1:
The damping function is segmented from the bulk gel material and concentrated into a localized damper weight component. This allows the damping function to be provided while maintaining the detachability of the inverter assembly, as the damper weight is a discrete component that can be installed and removed with the assembly.
Solution Approach 2:
The invention changes the physical state and distribution of the damping material from a bulk gel filling the entire chamber to a concentrated potting material forming a specific weight component. This parameter change enables both vibration damping and assembly detachability.
2Reliability
If vibration-damping gel is used to fill the inverter chamber, then substrate vibration is suppressed, but production cost increases due to high-temperature curing equipment
Solution Approach 1:
The invention changes the curing temperature parameter from high-temperature (required for gel) to room temperature (sufficient for potting material). This eliminates the need for expensive high-temperature curing equipment while achieving the same vibration damping effect.
Solution Approach 2:
The invention uses a cheaper potting material instead of expensive gel material, and employs simple room-temperature curing instead of expensive high-temperature equipment, thereby reducing production costs while maintaining the vibration damping function.
3Reliability
If gel material is used for vibration damping, then substrate stress is reduced, but high-temperature treatment applies harmful load to electronic components
Solution Approach 1:
The invention changes the curing temperature parameter from high-temperature to room temperature, thereby eliminating the harmful thermal stress on electronic components while still achieving vibration damping and solder connection protection through the potting material.
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 reduces vibration and stress on solder connections without increasing weight or production costs, allowing for easier inverter removal and avoiding high-temperature curing processes.
Implementation Method 1
A vibration damping member is arranged in the inverter assembly
Data Source
AI summary
A motor-driven compressor includes a compression mechanism for compressing a refrigerant gas, an electric motor, an inverter assembly and an inverter chamber. The electric motor drives the compression mechanism. The inverter assembly converts direct-current power into polyphase alternating-current power to supply to the electric motor and controls a rotational speed of the electric motor. A substrate having an electric circuit and an electronic component connected to the substrate are provided in the inverter assembly. The inverter chamber detachably accommodates the inverter assembly. A vibration damping member is arranged in the inverter assembly.