Position Sensor Alignment for Rotor Phase Angle Calibration
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Solution Overview
Problem
Existing methods for adjusting the angular position of position sensors in rotating electrical machines, such as PMAC motors, are complex, expensive, and require frequent recalibration, especially during maintenance or inverter changes, leading to inefficiencies and increased costs.
Innovation Solution
A mechanical adjustment method involving iterative rotations of the rotor and base of the measuring device to calculate and correct phase shift angles, allowing for precise mechanical alignment of the position sensor, which can be stored for future reference, reducing the need for repeated adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electrical or software methods are used to correct the angular orientation of the sensor, then the adjustment can be performed without mechanical disassembly, but the complexity of the adjustment process increases and the cost increases
Solution Approach 1:
The patent replaces complex electrical or software-based adjustment methods with a simple mechanical rotation system. The sensor assembly includes a rotatable base that can be manually rotated to adjust the angular orientation of the sensor, eliminating the need for complex electrical calibration procedures while reducing adjustment complexity and cost.
2Ease of repair
If electrical or software adjustments are used for position sensor calibration, then no mechanical disconnection is required, but the adjustment process becomes more expensive and complex
Solution Approach 1:
The patent implements a mechanical rotation mechanism with a rotatable base and fixing elements that allows simple manual adjustment of the sensor angle. This mechanical approach is more cost-effective and simpler to manufacture than electrical or software-based adjustment systems, while providing ease of repair and recalibration through straightforward mechanical rotation.
3Reliability
If position sensor adjustment is performed during maintenance or inverter changes, then the sensor can be recalibrated, but the process becomes tedious and requires vehicle lifting operations
Solution Approach 1:
The patent provides a mechanical adjustment system that can be performed quickly by rotating the base of the sensor assembly without requiring vehicle lifting or complex procedures. The fixing elements allow the sensor to be rotated and secured in the correct angular position, significantly reducing the time required for sensor recalibration during maintenance operations.
4Reliability
If a 1° offset exists between the stator and rotor, then the electrical machine can operate, but the torque drops by approximately 5% compared to nominal value
Solution Approach 1:
The patent implements a mechanical rotation system that allows precise adjustment of the sensor's angular orientation by rotating the base to the correct angle and securing it with fixing elements. This mechanical approach enables accurate alignment of the sensor with the rotor magnets, ensuring optimal torque performance by eliminating angular offsets.
5Reliability
If a 2° offset exists between the stator and rotor, then the electrical machine can operate, but the torque drops by around 20% compared to nominal value
Solution Approach 1:
The patent provides a mechanical adjustment mechanism with a rotatable base and fixing elements that enables precise angular positioning of the sensor. By mechanically rotating the sensor assembly to the correct angular orientation and securing it in place, the system achieves accurate alignment between the sensor and rotor magnets, thereby maintaining optimal torque performance and preventing significant torque drops.
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 method provides precise and cost-effective angular position adjustment of position sensors, improving the efficiency and performance of rotating electrical machines by simplifying the adjustment process and reducing the frequency of recalibrations.
Implementation Method 1
These sensors are for example Hall effect type sensors or inductive sensors
Implementation Method 2
These sensors are for example Hall effect type sensors or inductive sensors
Data Source
Figure 1~2
Figure 3
AI summary
The present invention relates to a method for adjusting a measuring device comprising positioning the measuring device on the stator (3), fixing the device on the stator by means of fixing elements (12), a first rotation of the rotor, measurement of its signal and of a signal from the sensor, calculation of a phase angle, rotation of a base (14) of the device, a second rotation of the rotor, calculation of a second phase angle, in the case where the second phase angle is outside an interval, an iteration of the previous steps is carried out, and fixing the measuring device on the stator.