Resolver Rotor Holder Structure for Precise Angle Detection
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Solution Overview
Problem
Resolver rotors in rotary electric machines face challenges in inhibiting displacement and adjusting load to improve rotation angle detection accuracy, as existing methods are inadequate in maintaining precise positioning and load distribution.
Innovation Solution
The resolver rotor incorporates a rotor core holder with annular flat plate portions and constraining portions that protrude between groove portions, allowing for precise positioning and load adjustment by elastic deformation, thereby inhibiting displacement in the axial, radial, and circumferential directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a collar is press-fitted into the rotary shaft to press the resolver rotor in the axial direction, then the displacement of the resolver rotor in the axial direction is inhibited, but the load (pressing force) must be appropriately adjusted to maintain positioning accuracy
Solution Approach 1:
The collar is designed with an elastic portion that can dynamically adjust its deformation state based on the fit between the rotary shaft and resolver rotor. The elastic portion deforms elastically to adapt to dimensional variations, automatically adjusting the pressing force without requiring manual load adjustment, thus resolving the contradiction between positioning accuracy and load adjustment flexibility
Solution Approach 2:
The collar's elastic portion changes its physical state (deformation degree) based on the fit conditions between the rotary shaft and resolver rotor. By changing the deformation parameter of the elastic portion, the pressing force is automatically adjusted to maintain optimal positioning accuracy while adapting to different load conditions
2Ease of manufacture
If the resolver rotor is clearance fitted to the rotary shaft, then the assembly is easy to manufacture, but the displacement of the resolver rotor relative to the rotary shaft increases
Solution Approach 1:
The collar acts as an intermediary component between the rotary shaft and resolver rotor. It maintains the clearance fit for easy assembly while simultaneously providing positioning and pressing functions through its elastic portion, thus resolving the contradiction between assembly ease and positioning accuracy
Solution Approach 2:
The invention replaces complex mechanical positioning systems (such as key grooves and multiple pressing members) with a simplified collar structure that uses elastic deformation to achieve both easy assembly and precise positioning, reducing manufacturing complexity while maintaining accuracy
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 enhances the detection accuracy of rotation angles by maintaining the resolver rotor's position relative to the shaft, allowing for effective load adjustment and displacement inhibition, thereby improving the overall performance of the resolver.
Implementation Method 1
a collar having an elastic portion that is elastically deformable
Implementation Method 2
the displacements of the resolver rotor in the circumferential direction and the radial direction can also be inhibited with the frictional force generated between the member such as a collar and the resolver rotor
Data Source
AI summary
According to an embodiment, a resolver rotor includes: a resolver rotor core; and a resolver rotor core holder that constrains the resolver rotor core to a rotor shaft in a circumferential direction and an axial direction. The resolver rotor core holder includes: an annular flat plate portion; a first constraining portion that holds a relative position of the resolver rotor core holder to the rotor shaft, and holds an angle of the resolver rotor core in the circumferential direction relative to the rotor shaft; a second constraining portion that holds a relative position of the resolver rotor core holder to the rotor shaft; and a third constraining portion that holds a relative position of the resolver rotor core in the axial direction to the rotor shaft. The resolver rotor core includes a radially inside recessed portion for engagement with the first constraining portion.