Encoder Rotating Member Mounting Structure with Boss Positioning
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Solution Overview
Problem
The existing mounting process for rotating members in encoders is time-consuming and labor-intensive, requiring adjustment of the phase angle between magnets on a motor rotor and the phase angle detection pattern on a rotating plate to achieve a predetermined phase relationship.
Innovation Solution
A mounting structure and method that includes a rotating shaft with a cut-out cylindrical portion and a boss with a boss hole and screw hole, allowing easy alignment and fixation of the rotating member, utilizing positioning structures such as cut surfaces and position adjustment marks to set the phase angles in a predetermined state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotating plate is mounted to the rotating shaft using conventional methods, then the phase angle of the magnets and the phase angle of the pattern can be adjusted in position, but the mounting process takes time and effort
Solution Approach 1:
The boss is provided with a positioning structure (cut surface) before mounting, which preliminarily determines the angular position of the rotating plate relative to the rotating shaft. This preliminary positioning eliminates the need for time-consuming manual adjustment of phase angles during assembly, while still achieving precise phase angle alignment between the magnets and the detection pattern
Solution Approach 2:
The boss acts as an intermediary component between the rotating shaft and the rotating plate. It features a positioning structure with a cut surface that interfaces with the rotating shaft, and position adjustment marks that guide the attachment of the rotating plate. This intermediary structure transfers the positioning function from the final assembly step to the boss design itself, reducing assembly time while maintaining precision
2Measurement precision
If manual adjustment is used to set the phase relationship between magnets and detection pattern, then accurate phase alignment can be achieved, but the process is labor-intensive
Solution Approach 1:
The boss's positioning structure with cut surface and position adjustment marks enables the system to self-position the rotating plate correctly during assembly. The cut surface automatically aligns with the rotating shaft's reference feature, and the position adjustment marks guide the operator to the correct angular position without requiring manual measurement or adjustment of phase angles, thus achieving accurate phase alignment while simplifying the operation
Data Source
AI summary
A mounting structure of a rotating member of an encoder for detecting a phase angle of a magnet provided on a rotor of a motor includes: a rotating shaft configured to be rotated by driving of the motor; the rotating member on which a phase angle detection pattern configured to detect the phase angle is formed; and a boss attached to the rotating member and configured to mount the rotating member to an end of the rotating shaft. In this configuration, the end of the rotating shaft and the boss are provided with a first positioning structure configured to position a mounting position of the boss relative to the rotating shaft about the axis of the rotating shaft.