Sensor Mounted on Electronic Card for Motor Vehicle Electrical Systems
Solution Overview
Problem
Existing electrical equipment for motor vehicles faces challenges in reducing costs and minimizing sensitivity to magnetic disturbances, particularly in the integration of sensors with control units within electric machines, which often require additional components and shielding due to their proximity to magnetic fields.
Innovation Solution
The integration of a sensor directly on an electronic card within the electric machine, where the sensor is mounted on the rotating shaft and interacts with a magnetic target, reducing the need for additional support or shielding, as it is less sensitive to magnetic disturbances and eliminates the need for separate connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is mounted on a separate support or connector near the motor, then the sensor can detect rotor position, but the sensor becomes sensitive to magnetic disturbances from the stator and rotor
Solution Approach 1:
The sensor is directly mounted on the electronic card that carries the control unit, merging the sensing function with the control electronics. This integration eliminates the need for separate connectors and supports, and positions the sensor away from the motor's magnetic fields while maintaining electrical connection capability.
Solution Approach 2:
The electronic card serves as an intermediary carrier that holds both the sensor and control unit components. The card provides a stable mounting platform for the sensor while maintaining electrical connections, acting as a mediator between the sensor and the control system without requiring additional connectors.
2Reliability
If additional components like sensor supports and connectors are used, then the sensor can be properly mounted and connected, but the device complexity and cost increase
Solution Approach 1:
The sensor mounting function is merged with the electronic card structure. The card itself serves as the support platform for the sensor, eliminating the need for separate sensor supports and connectors. This reduces the total component count while maintaining reliable mounting and electrical connection.
Solution Approach 2:
The electronic card is designed to serve multiple functions: it carries the control unit electronics, provides mounting support for the sensor, and maintains electrical connections. This multi-functionality reduces the need for dedicated components for each function, simplifying the overall device structure.
3Measurement precision
If the sensor is placed close to the motor for accurate detection, then detection precision improves, but shielding becomes necessary to protect against magnetic interference
Solution Approach 1:
The sensor is extracted from the immediate motor environment and mounted on the electronic card instead. This physical separation removes the sensor from the high magnetic field zone of the stator and rotor, eliminating the need for magnetic shielding while preserving detection capability through the card's positioning.
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 simplifies sensor mounting, reduces costs by eliminating additional components, and enhances the robustness against magnetic interference, allowing for precise rotor position detection without additional shielding requirements.
Implementation Method 1
a target mounted on the rotating shaft, a sensor arranged to interact with the target in particular to deliver information relating to the angular position of the rotating shaft
Data Source
Figure 1
Figure 2
AI summary
The invention relates to an electrical equipment (1), in particular for a motor vehicle, this electrical equipment comprising: - an electrical machine (7) having a rotating shaft (19), - a target (60) mounted on the rotating shaft, - a sensor (61) arranged to interact with the target in particular to deliver information relating to the angular position of the rotating shaft, - an electronic card (62) carrying at least one data processing unit (63), the sensor being mounted on this card and electrically connected to the processing unit.