Servo Motor Hall Position Sensing for Compact Robot Joints
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Solution Overview
Problem
Servo motors used in footed robots face challenges due to their large size and low relative position detection accuracy, which hinders precise control and efficient space utilization.
Innovation Solution
A servo motor design incorporating a housing with a rotor, stator, Hall magnet, and printed circuit board with a position sensor, optimized for miniaturization by adjusting the distance between the Hall magnet and sensor for improved detection accuracy and space utilization, along with a planetary reduction mechanism for reduced size and enhanced heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the servo motor uses a conventional design with separate detection components, then the structure is simple to manufacture, but the relative position detection accuracy is low
Solution Approach 1:
The patent combines the Hall magnet and position sensor into an integrated detection system where the Hall magnet is arranged on the rotor and the position sensor faces it on the stator. This merging of magnetic field generation and detection functions into a compact arrangement improves relative position detection accuracy while avoiding the complexity of separate detection components.
Solution Approach 2:
The patent replaces conventional mechanical position detection methods with a magnetic field-based detection system using Hall magnets and position sensors. This substitution eliminates the need for complex mechanical linkages and contact-based detection, achieving higher precision with reduced mechanical complexity.
2Measurement precision
If the servo motor increases the distance between Hall magnet and position sensor for better detection, then the detection accuracy improves, but the motor size increases
Solution Approach 1:
The patent optimizes the distance parameter between the Hall magnet and position sensor to achieve the best detection accuracy within a compact size. By carefully controlling this critical dimension and adjusting magnetic field strength parameters, the system achieves high detection accuracy without increasing overall motor volume.
Solution Approach 2:
The patent concentrates the magnetic field interaction in a specific localized region between the Hall magnet and position sensor, creating a high-density detection zone. This localized quality enhancement allows accurate detection within a small spatial footprint, avoiding the need to increase overall motor dimensions.
3Volume of stationary object
If the servo motor uses a compact design with reduced components, then the space utilization improves, but the heat dissipation capability deteriorates
Solution Approach 1:
The patent transitions from purely radial heat dissipation to three-dimensional heat management by incorporating axial ventilation channels and side wall heat dissipation structures. This dimensional expansion of heat dissipation pathways allows effective thermal management within a compact volume, preventing heat accumulation despite reduced internal space.
4Measurement precision
If the servo motor maintains a conventional structure for ease of manufacture, then the production is simpler, but the relative position detection accuracy remains low
Solution Approach 1:
The patent segments the motor into distinct functional modules: the rotor with Hall magnet, the stator with position sensor, and the housing with integrated ventilation channels. This segmentation allows each component to be manufactured and assembled separately using conventional techniques, maintaining manufacturing simplicity while enabling precise positioning and alignment for high detection 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
The design achieves miniaturization of the servo motor, enhances detection accuracy, and improves heat dissipation, leading to more precise control and efficient space use in footed robots.
Implementation Method 1
a Hall magnet arranged on the rotor; and a printed circuit board arranged in the housing and provided with a position sensor facing the Hall magnet
Data Source
AI summary
A servo motor and a robot. The servo motor includes: a housing, a rotor, a stator, a Hall magnet, and one printed circuit board. The rotor is arranged in the housing and has a rotor support and a rotor shaft; the stator is arranged in the housing; the Hall magnet is arranged on the rotor; the printed circuit board is arranged in the housing and provided with a position sensor facing the Hall magnet.