Multi-Layer Compressor Control Board Layout for Vibration Suppression
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Solution Overview
Problem
Rotational drive of a compressor causes vibration that is transmitted to the control board of a motor control device, requiring a countermeasure to suppress vibration.
Innovation Solution
A multi-layer control board design where elements such as an insulating IC and an insulating transformer are mounted to partially overlap in planar view, with a vibration-resistant structure and noise suppression elements connected to common ground and power supply patterns, and the board is fixed to the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control board is used in an electric compressor, then motor control function is achieved, but vibration from compressor rotation is transmitted to the control board
Solution Approach 1:
The patent transitions from a single-layer control board to a multi-layer board structure. By stacking multiple layers (first layer through n-th layer) and mounting elements in overlapping positions in the planar view, the design adds a vertical dimension to the layout. This three-dimensional arrangement allows vibration isolation while maintaining control functionality.
Solution Approach 2:
The patent implements a nested structure where multiple circuit layers are stacked within each other, with elements on different layers positioned to overlap when viewed from above. This nesting approach allows compact arrangement of control components while the layered structure inherently provides vibration damping between layers.
2Ease of manufacture
If elements are mounted on a single-layer board, then manufacturing is simple, but board area is large and vibration suppression is insufficient
Solution Approach 1:
The invention moves from two-dimensional single-layer layout to three-dimensional multi-layer stacking. Elements that would require large horizontal spacing on a single layer are instead arranged in overlapping positions across multiple vertical layers, dramatically reducing the planar footprint while maintaining manufacturing feasibility through standard multi-layer PCB techniques.
3Object-generated harmful factors
If multiple separate noise suppression elements are used, then noise suppression effectiveness is high, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple noise suppression functions into shared ground patterns and power supply patterns that are common to multiple circuit elements. Instead of providing separate suppression elements for each component, the design uses overlapping element arrangements where ground and power networks serve multiple layers and elements simultaneously, reducing total component count while maintaining noise suppression effectiveness.
Data Source
AI summary
An object is to suppress vibration. The electric compressor includes: an electric motor; a compressor rotated by output of the electric motor; and a motor control device configured to perform drive control on the electric motor. The motor control device includes a control board (50) for controlling the electric compressor. The control board (50) is a multi-layer board including a first layer (50a) on which an insulating IC (51) is mounted and a fourth layer (50c) on which an insulating transformer (52) is mounted. The insulating IC (51) and the insulating transformer (52) are mounted so as to at least partially overlap with each other in planar view.