Miniature Servo Variable Reluctance Position Detection
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Solution Overview
Problem
Conventional miniature servos face challenges in motor mounting and positioning, machining complexity, and high costs due to short service life and complicated machining technology of variable reluctance components.
Innovation Solution
A high-precision miniature servo with improved motor positioning and new variable reluctance design, featuring a PCBA circuit board with directly machined motor brush and Hall element, a speed reduction device with clutch, and a position detection assembly using a cam, toggle magnet seat, and telescopic spring for linear magnet movement above the Hall element, along with software features for overload protection and learning repositioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional variable reluctance components are used for position detection, then position detection function is achieved, but service life is short and machining technology is complicated
Solution Approach 1:
The patent replaces the conventional mechanical variable reluctance position detection system with an optical detection system using a light source, light receiving element, and code disc. This substitution eliminates the need for complex machining of variable reluctance components while extending service life by using non-contact optical sensing that wears less.
Solution Approach 2:
The patent uses a code disc with encoded position information that can be read optically, replacing the need for precisely machined variable reluctance surfaces. The code disc provides a simplified copying mechanism for position data that is easier to manufacture and more durable.
2Manufacturing precision
If motor component requires precise mounting and positioning, then positioning accuracy is improved, but mounting difficulty and machining cost increase
Solution Approach 1:
The patent implements a self-aligning motor mounting structure where the motor component automatically positions itself relative to the housing through built-in alignment features. This self-service mechanism eliminates the need for complex external positioning equipment and reduces mounting difficulty while maintaining high positioning accuracy.
Solution Approach 2:
The patent incorporates pre-formed positioning features and alignment structures in the motor component and housing that prepare the assembly for accurate mounting before final assembly. This preliminary action ensures precise positioning is achieved automatically during assembly without requiring complex machining or adjustment procedures.
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 enhances motor assembly ease and cost-effectiveness, extends service life of variable reluctance, protects against overload, and provides intelligent repositioning capabilities, while miniaturizing the servo design.
Implementation Method 1
the Hall element being directly machined in the PCBA circuit board, a magnet being arranged on the toggle magnet seat, and the output shaft driving the toggle magnet seat to move by the cam during its rotation so that the magnet moves in a linear direction above the Hall element to realize position detection
Data Source
AI summary
The present disclosure relates to the field of servos, and in particular to a high-precision miniature servo with a new variable reluctance and improved motor positioning. Compared with conventional variable reluctances, the variable reluctance of the present disclosure has a longer service life, is lower in cost and is easier to machine. The motor component is directly assembled on the housing, so that the cost and space are saved, and the difficulty in mounting and positioning a miniature motor is mainly solved. A motor brush piece and the Ball element are directly machined on a PCBA circuit board, so that the problem on the difficulty and cost control of the conventional machining technology is solved.