Compact Synchronous Motor Rotor Extension for Sensor Placement
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Solution Overview
Problem
Existing self-driven synchronous rotating electrical machines face challenges in managing the mechanical connection between the motor casing and the rotating shaft, particularly in compact designs where the bearing support interferes with electromagnetic functions and position sensors, limiting flexibility and space optimization.
Innovation Solution
The solution involves positioning rotor position detection means, such as Hall effect sensors, close to the rotor with a flange supporting a bearing interposed between the stator and rotor, allowing for independent management of electronic and mechanical functions, enhancing compactness and space utilization by optimizing the magnetic detection and switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bearing support is positioned beyond the electronic control device to ensure mechanical connection, then the mechanical connection between casing and shaft is achieved, but the position sensors are interfered with and space optimization is limited
Solution Approach 1:
The patent divides the motor structure into distinct functional zones: the bearing support is positioned at the stator end, while the electronic control device and position sensors are located in the rotor extension area. This spatial segmentation allows independent optimization of mechanical support and electromagnetic sensing functions without mutual interference.
Solution Approach 2:
The patent extends the rotor axially beyond the stator to create additional space for housing the electronic control device and position sensors. This dimensional extension resolves the spatial conflict between mechanical bearing support requirements and electromagnetic sensing requirements by utilizing the axial dimension.
2Volume of moving object
If the bearing support is positioned close to the rotor to improve compactness, then space is optimized, but the position detection function is interfered with
Solution Approach 1:
The patent segments the motor into a main stator-rotor assembly and an extended rotor section. The bearing support is positioned at the stator end, while the sensor housing is located in the extended rotor section, ensuring that compact mechanical design does not compromise sensor positioning accuracy.
Solution Approach 2:
The patent introduces a dedicated sensor housing as an intermediary structure that accommodates position sensors at the optimal location in the rotor extension. This intermediary element protects the sensors while maintaining their precise positioning relative to the rotor magnets, decoupling the compactness requirement from sensor positioning requirements.
3Volume of moving object
If the electronic control device is integrated into the motor casing, then space is utilized efficiently, but the management of control wires and connection becomes complex
Solution Approach 1:
The patent extracts the electronic control device from the stator-casing area and relocates it to the rotor extension. This extraction simplifies connection management by positioning the control device adjacent to the rotor windings, reducing wire length and complexity while maintaining efficient space utilization through the underutilized rotor extension volume.
4Measurement precision
If the position sensors are placed close to the rotor to improve detection accuracy, then measurement precision is improved, but the mechanical structure becomes more complex
Solution Approach 1:
The patent designs the rotor extension to serve multiple functions: it houses the position sensors, accommodates the electronic control device, and provides structural support for the bearing. This multi-functionality reduces overall mechanical complexity by consolidating multiple components into a single integrated structure rather than adding separate mounting mechanisms.
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 improves the flexibility and compactness of the design, allowing better space management and efficient connection of control electronics and stator windings, while maintaining effective magnetic flux detection and switching without interfering with mechanical stresses or electromagnetic operations.
Implementation Method 1
at least one position sensor capable of detecting a change in magnetic polarization of the peripheral permanent magnets of the rotor during rotor rotation
Implementation Method 2
a stator provided with coils and a rotor whose periphery is coated with permanent magnets having successively reversed poles
Data Source
Figure 1~2
Figure 3~4
AI summary
A self-piloted synchronous rotating electric machine comprising a stator (2) and a rotor (4) equipped with peripheral permanent magnets (5). The stator (2)/rotor (4) assembly is housed in a casing (1) connected to a rotating shaft (6) driven by the rotor (4) via bearings (11, 11') arranged on either side of said assembly. Means for detecting the rotor position for controlling the supply of power to the stator coils (3) are located in the vicinity of the rotor (4). A flange (10) supporting a bearing (11, 11') is interposed between the stator (2)/rotor (4) assembly and means for detecting changes in the polarization of the permanent magnets (5).