Motor Control Device Grounding via Conductive Support Member
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Solution Overview
Problem
Existing motor driving control devices face challenges in achieving potential balance between various components due to complex electrical connections, which can disrupt signal conversion and voltage computation processes, especially when the sensor and computing section potentials are not aligned.
Innovation Solution
A motor driving control device with a simple structure that includes a conductive member on the supporting member to ground the rotating body, output shaft, and bearing member, using a thin metal plate or metal plating for electrical connection, ensuring balanced potentials across components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the yoke and bearing portion are electrically connected to the ground region via shield plate, clip members, and bus bar, then the potential balance between motor components and computing section is achieved, but the structure becomes complex with multiple components required
Solution Approach 1:
The patent combines multiple electrical connection components (shield plate, clip members, bus bar) into a single integrated electrically-conductive member that is provided on the supporting member. This single component simultaneously provides electrical connection between the bearing member and heat dissipating member, eliminating the need for separate shield plates, clip members, and bus bars while maintaining potential balance between motor components and the computing section.
Solution Approach 2:
The supporting member is designed to serve multiple functions: it mechanically supports the circuit board and motor components while also providing an electrically-conductive member that establishes electrical connection for potential balancing. This multi-functional design integrates structural support and electrical connection functions into a single component system, reducing overall device complexity.
2Reliability
If multiple components (shield plate, clip members, bus bar) are used for electrical connection, then reliable potential balance is achieved, but the number of parts increases and assembly becomes more difficult
Solution Approach 1:
The patent merges the functions of shield plate, clip members, and bus bar into a single electrically-conductive member integrated on the supporting member. This reduction from multiple separate parts to one integrated component simplifies the manufacturing process and assembly operations while maintaining reliable electrical connection for potential balance.
3Reliability
If a complex electrical connection path is used through multiple components, then potential balance is achieved, but the manufacturing cost and assembly time increase
Solution Approach 1:
The patent consolidates multiple electrical connection components into a single integrated electrically-conductive member on the supporting member. This eliminates the need for sequential assembly of multiple separate components, thereby increasing assembly speed and productivity while maintaining the reliability of potential balance between motor components and the computing section.
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 solution enables reliable electrical connection and potential balance between the motor components, preventing operational disruptions and simplifying the structure, thus ensuring stable motor control.
Implementation Method 1
an electrically-conductive member that is provided at a surface of the supporting member, and that, by electrically connecting the bearing member and the heat dissipating member, grounds the rotating body, the output shaft and the bearing member
Implementation Method 2
a heat dissipating member that dissipates heat of the circuit board
Data Source
AI summary
A motor driving control device for a vehicle that includes: a circuit board on which is packaged a circuit that generates the voltage applied to windings of a motor, the circuit board having a ground region; a heat dissipating member that dissipates heat from the circuit board, and that is electrically connected to the ground region on the circuit board; a supporting member that holds the circuit board and a bearing member of the motor, and that has an insulating surface; and an electrically-conductive member that is provided at a surface of the supporting member, and that, by electrically connecting the bearing member and the heat dissipating member, grounds a rotating body, an output shaft and the bearing member of the motor.