Position Sensor Mounting in Sealed Electric Motor Housing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration of a position sensor in electrical equipment, such as an electric supercharger, is challenging due to sealing constraints and the need for the sensor to be close to the engine, while also ensuring a sealed connection between the electric machine and electronic control device.
Innovation Solution
A connection device with a sealing member that houses the position sensor, allowing it to be positioned close to the rotation shaft of the electric machine, while maintaining a sealed separation between the machine and control device housings, and includes electrical connection elements like tabs and protrusions for secure attachment to the electronic control device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the position sensor is positioned close to the rotation shaft of the electric machine, then the detection precision is improved, but the sealing constraint between the electric machine and electronic control device is compromised
Solution Approach 1:
The device is divided into two separate housings: a first housing containing the electric machine and a second housing containing the electronic control device. The position sensor is positioned in the first housing close to the rotation shaft for accurate detection, while the second housing remains sealed for reliable electronic control. This segmentation resolves the contradiction by spatially separating the detection function from the sealed control environment.
2Device complexity
If the electric machine and electronic control device are integrated in a compact assembly, then the device complexity is reduced, but the electrical connection between them becomes difficult to establish
Solution Approach 1:
An electrical connection element serves as an intermediary component between the electric machine and electronic control device. This element extends from the first housing to the second housing, providing a reliable electrical pathway for control signals while maintaining the compact integrated structure. The intermediary element resolves the contradiction by enabling electrical connection without requiring complex wiring arrangements.
3Manufacturing precision
If the position sensor is integrated into the sealed assembly, then the manufacturing precision is improved, but the risk of spurious short-circuits increases
Solution Approach 1:
The assembly is segmented into a first housing containing the position sensor and electric machine, and a second housing containing the electronic control device. This segmentation physically isolates the sensor from potential sources of electrical interference while maintaining precise relative positioning through the housing structure, thus reducing short-circuit risk without compromising manufacturing precision.
Solution Approach 2:
The electrical connection element acts as an intermediary that provides controlled electrical pathways between components. By routing connections through this dedicated element rather than allowing direct exposure of sensor leads, the design reduces the risk of spurious short-circuits while maintaining precise assembly tolerances.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to a position detection device (500) intended to be mounted in a housing which includes an electric machine and an electronic control device for the electric machine, for transferring a position signal from the machine to said electronic control device, the device (500) comprising: - a position sensor (501), - a support (502) on which the position sensor (501) is intended to be mounted, the support (502) being configured to be received against the walls of a blind hole inside said housing in order to achieve, at least in part, the retention in place of said device (500).