Electric Rotating Machine Circuit Board Noise Suppression
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Solution Overview
Problem
Existing electric rotating machine apparatuses face issues with noise interference between the current-supply circuit and control circuit, leading to performance degradation and increased size due to the need for separate noise isolation and heat dissipation.
Innovation Solution
The apparatus includes a heat sink with a plate-shaped portion separating the current-supply circuit board and control circuit board, allowing for parallel arrangement and effective heat transfer while minimizing noise propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the current-supply circuit board and control circuit board are mounted on the same circuit board, then the product size is reduced, but noise interference occurs between the circuits
Solution Approach 1:
The patent divides the circuit board into two separate boards: a current-supply circuit board for high-current switching operations and a control circuit board for low-current control functions. This segmentation physically separates noise-generating components from sensitive control components, eliminating noise interference while maintaining a compact integrated structure within the housing.
Solution Approach 2:
The patent introduces a partition wall as an intermediary structure between the current-supply circuit board and control circuit board. This partition wall acts as a noise barrier that further isolates the two circuits, preventing electromagnetic interference while allowing both boards to be mounted within the same housing space.
2Object-affected harmful factors
If the current-supply circuit and control circuit are separated by a certain distance to reduce noise, then noise interference is suppressed, but the circuit board size is enlarged
Solution Approach 1:
Instead of separating circuits in the planar dimension (which would increase board area), the patent uses the vertical dimension by stacking the current-supply circuit board and control circuit board at different heights within the housing. The partition wall extends vertically to provide noise isolation, allowing effective noise suppression without increasing the footprint area of the circuit assembly.
3Temperature
If the control circuit board is mounted on the heat sink, then heat radiation is improved, but noise interference with the control circuit occurs
Solution Approach 1:
The patent introduces a partition wall as an intermediary barrier between the heat sink (which conducts noise from the current-supply circuit) and the control circuit board. This partition wall blocks the transmission of both heat and noise, allowing the control circuit board to be mounted on the heat sink for thermal management while preventing noise interference through the partition barrier.
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 configuration ensures efficient heat dissipation, reduces product size, and suppresses noise interference, resulting in a compact and lightweight electric rotating machine apparatus.
Implementation Method 1
a heat sink that is disposed at axial-direction one side of the electric rotating machine and has a plate-shaped portion extending toward the axial-direction one side
Data Source
AI summary
It is required to obtain an electric rotating machine apparatus that secures a heat-radiation property, suppresses upsizing, and can suppress the effect of noise generated from a current-supply circuit. The electric rotating machine apparatus according to the present disclosure includes an electric rotating machine, a heat sink having a plate-shaped portion extending toward axial-direction one side, a current-supply circuit board that is disposed on one surface of the plate-shaped portion of the heat sink and on which a current-supply circuit for supplying an electric current to the electric rotating machine is mounted, and a control circuit board that is disposed in such a way as to be spaced apart from and in parallel with the current-supply circuit board and on which a control circuit for controlling the current-supply circuit is mounted. In addition, an electric power steering apparatus according to the present disclosure includes the foregoing electric rotating machine apparatus.