Stator Position Measurement Using Non-Contact Sensor
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Solution Overview
Problem
Conventional methods for adjusting the stator position in motor driving devices for hybrid vehicles face challenges due to deformation of the stator core caused by fastening bolts, leading to vibrations and difficulty in maintaining the axial center position, especially as the thickness of the motor driving device increases, and the presence of varnish makes accurate measurement and adjustment complicated.
Innovation Solution
A stator position measuring method and device using a non-contact displacement sensor sensitive to magnetic or conductor materials, allowing for precise measurement of the stator's position relative to the rotor's axial center, even in the absence of the rotor, by measuring the radial surface of the stator core, and an adjustment mechanism that includes eccentric cams for accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fastening bolts are used to secure the stator core, then the stator core is fixed to the motor case, but the stator core deforms and the axial center position cannot be maintained
Solution Approach 1:
The stator core is segmented into multiple steel plates that are fastened separately. By dividing the core into segments and fastening them individually, the deformation caused by each bolt is distributed and controlled, preventing overall core distortion while maintaining fixation strength.
Solution Approach 2:
The fastening parameters are optimized by controlling the tightening torque and sequence of the bolts. By carefully managing these parameters, the clamping force is sufficient to secure the stator core while minimizing deformation that would affect axial center position precision.
2Power
If the motor driving device thickness is increased to satisfy performance requirements, then the motor can handle higher power demands, but vibrations increase and axial center position becomes difficult to maintain
Solution Approach 1:
The stator core is divided into multiple steel plates that are fastened separately. This segmentation allows for better distribution of mechanical stresses in thicker motor designs, reducing vibrations while maintaining the increased power capability provided by the greater thickness.
Solution Approach 2:
By optimizing the fastening parameters such as bolt tightening sequence and torque control, the patent reduces vibrations in thicker motor designs while maintaining the power output benefits of increased thickness.
3Ease of operation
If conventional measurement methods are used to measure stator position, then measurement can be performed, but the presence of varnish and fastening bolts makes accurate measurement difficult
Solution Approach 1:
The patent replaces conventional mechanical contact measurement methods with non-contact measurement technology. This substitution eliminates the interference caused by varnish and fastening bolts, allowing accurate measurement of the stator core's axial center position without physical contact that would be blocked by these components.
Solution Approach 2:
The patent introduces a reference object or reference plane that serves as an intermediary for measurement. By measuring the position of the stator core relative to this reference (which is not affected by varnish or bolts), accurate position data can be obtained even in the presence of these interfering elements.
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
Enables accurate and speedy stator positioning adjustments, reducing vibrations and ensuring precise alignment of the stator with the rotor's axial center, thereby improving the motor driving device's performance and assembly precision.
Implementation Method 1
a non-contact type displacement sensor which is selective with respect to a magnetic body or a conductor
Data Source
AI summary
A stator position measuring method and device relating to a motor driving device including a motor case, a rotor, and a stator disposed on an outer periphery of the rotor concentrically with the rotor, includes measuring a position of the stator relative to an axial center of the rotor, wherein the position of the stator is determined in a rotor not-inserted state, in which the stator is housed inside the motor case and the rotor is not inserted in the stator, by measuring a position of a radial surface of a stator core, which includes a magnetic body or a conductor forming the stator, relative to the axial center of the rotor using a non-contact displacement sensor that is selectively sensitive to the magnetic body or the conductor.