Rotor Assembly With Displaceable Axial Sensor Positioning
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Solution Overview
Problem
Existing axial position sensors in electromagnetic machines are not accurately positioned to detect the rotor's axial position due to their radial mounting, leading to imprecise control of levitation actuators, which can result in rotor damage or misalignment during loading and unloading of parts.
Innovation Solution
A displaceable axial position sensor is integrated with the stator assembly, allowing it to maintain a fixed axial distance from the rotor, ensuring precise detection of the rotor's position by sensing the axial end rather than the circumferential surface, and is connected to a controller to operate levitation actuators for accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the axial position sensor is mounted radially outwardly from the rotor, then the sensor can detect the rotor position, but the measurement precision deteriorates because the sensor cannot accurately detect the axial position
Solution Approach 1:
The sensor assembly is made axially displaceable relative to the stator assembly, allowing the sensor to dynamically adjust its axial position to maintain a predetermined gap with the rotor during axial displacement operations. This dynamic adjustment capability resolves the contradiction by enabling accurate axial position measurement while accommodating the mechanical displacement requirements of the system.
2Adaptability or versatility
If the stator assembly and rotor are axially displaced for loading and unloading, then the operational versatility is improved, but the measurement precision deteriorates due to changes in sensor-rotor relative position
Solution Approach 1:
The sensor assembly is configured to displace axially with the stator assembly while maintaining a predetermined axial gap with the rotor through coordinated displacement. This allows the system to perform loading and unloading operations with full adaptability while the sensor continuously tracks the rotor's axial position with high precision, resolving the contradiction between operational versatility and measurement accuracy.
3Measurement precision
If a fixed radial sensor is used to detect rotor position, then the device complexity is low, but the measurement precision deteriorates because the sensor cannot accurately measure axial position during displacement
Solution Approach 1:
The sensor assembly incorporates an axial displacement mechanism that automatically maintains the predetermined gap between the sensor and rotor during stator and rotor displacement operations. This dynamic design improves measurement precision while the standardized interface and integrated mounting reduce installation complexity, resolving the contradiction between accuracy and ease of operation.
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 solution provides precise control of the rotor's axial position, preventing damage and ensuring accurate loading and unloading of parts by maintaining a consistent axial gap, thereby enhancing the operational safety and efficiency of the electromagnetic machine.
Implementation Method 1
a plurality of electromagnetic coil assemblies disposed within the housing, spaced circumferentially about the central axis and configured to exert magnetic torque on the rotor such that the rotor angularly displaces about the central axis
Implementation Method 2
an axial position sensor spaced axially from the lower axial end of the rotor and configured to sense the position of the rotor along the central axis
Data Source
AI summary
A rotor assembly includes a rotor disposable around a central member, connectable with a holder and having upper and lower axial ends. A stator assembly includes a housing having a central bore, the rotor and central member being disposed within the bore, and electromagnetic coil assemblies disposed within the housing, spaced around the axis and configured to exert magnetic torque on the rotor such that the rotor angularly displaces about the central axis. One or more actuators are configured to linearly displace the stator assembly and the rotor along the central axis relative to the central member. A sensor assembly is connected with the stator housing and includes an axial position sensor spaced axially from the lower axial end of the rotor and configured to sense the position of the rotor along the central axis, the axial position sensor being displaceable axially when the actuator displaces the stator housing.