Integrated Inductive Position Sensing in Electromagnetic Clutches
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Solution Overview
Problem
Conventional position sensors for new energy vehicles are bulky, require specific environmental conditions, and need dedicated connectors, which limits their spatial integration and flexibility in compact power systems.
Innovation Solution
A high-precision, compact inductive position sensor with a magnetic circuit formed by a movable magnetic conductor and an induction coil assembly, allowing for accurate position detection based on the relationship between input and feedback currents, and integrating with other interfaces to eliminate the need for specific connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional position sensors are used, then position detection function is achieved, but volume is large and spatial structure is affected
Solution Approach 1:
The patent combines the position sensor with the electromagnetic clutch assembly, integrating the sensor into the existing structure. The sensor detects position of the movable iron core within the clutch assembly, eliminating the need for separate external sensors and reducing overall system volume.
Solution Approach 2:
The electromagnetic clutch assembly serves multiple functions: it provides electromagnetic actuation for clutch engagement/disengagement and simultaneously houses the position sensor for detecting the movable iron core position. This multi-functional design reduces the number of separate components needed.
2Measurement precision
If conventional position sensors are used, then position detection is achieved, but specific connectors and layout space are required
Solution Approach 1:
The sensor is integrated directly into the electromagnetic clutch assembly structure, with the coil assembly serving as both the actuator and the sensor housing. This eliminates the need for separate connectors and reduces layout space requirements.
Solution Approach 2:
The sensor system is segmented into functional components within the clutch assembly: the coil assembly for electromagnetic actuation, the movable iron core for position indication, and the detection circuitry integrated into the assembly. This segmentation allows each component to perform its function without requiring external connections.
3Measurement precision
If conventional position sensors are used, then position detection is achieved, but environmental requirements are high
Solution Approach 1:
The patent uses the existing magnetic field environment of the electromagnetic clutch assembly for position detection. The movable iron core's position is detected through its effect on the magnetic circuit, converting the magnetic field (which could be considered interference) into the detection mechanism. This eliminates the need for shielded environments or special environmental conditions.
Solution Approach 2:
The electromagnetic clutch assembly itself provides the detection field and detection target. The coil assembly generates the magnetic field, the movable iron core responds to position changes, and the integrated circuitry detects the position. The system uses its own components for detection, eliminating external environmental dependencies.
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
The inductive position sensor provides accurate position detection with strong anti-magnetic interference capabilities, flexible structural design, and reduced spatial requirements, making it suitable for a wide range of environments and applications in new energy vehicles.
Implementation Method 1
an induction coil assembly adjacent to the movable part, wherein the induction coil assembly and the movable part form a magnetic circuit
Implementation Method 2
the induction coil assembly and the movable part form a magnetic circuit
Data Source
Figure 1~2
Figure 3~4
AI summary
An inductive position sensor, comprising: a movable part (1) which is a magnetic conductor; and an induction coil assembly (100) adjacent to the movable part (1), wherein the induction coil assembly (100) and the movable part (1) form a magnetic circuit, the induction coil assembly (100) has an input end for inputting a current and an output end for outputting a feedback current; the inductive position sensor is used to detect a position of the movable part (1) based on a relationship between the feedback current and the input current. The inductive position sensor of the present disclosure has flexible and compact structural design, and can be adjusted and arranged according to different applications and structural spaces, so it is applicable to a wide range of environments. An electromagnetic clutch is also proposed.