Servo Control System Using Magnetic Encoding for Position Accuracy

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Solution Overview

Problem

Existing servo control systems face inaccuracies in position measurement due to wear in potentiometers over time, leading to inaccurate positioning of servos.

Innovation Solution

A servo control system that includes a main control module and an angle collection module with a magnet and magnetic encoding chip, where the magnet is connected to the servo's rotation output shaft, allowing the magnetic encoding chip to sense the changing magnetic field and accurately determine the rotation angle, enabling precise position information acquisition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If potentiometers are used to collect position information, then the structure is simple and easy to manufacture, but the measurement precision deteriorates over time due to wear

Engineering Contradiction:

Improveease of manufactureVSAvoidposition information accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent replaces the mechanical contact-based potentiometer with a magnetic field-based non-contact sensing system. The magnetic encoding chip detects the position of the magnet through magnetic field changes without physical contact, eliminating wear and maintaining measurement precision over time while keeping the overall structure relatively simple.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary between the moving part (magnet) and the sensing part (magnetic encoding chip). This magnetic field mediator enables non-contact transmission of position information, avoiding direct mechanical contact and wear between components.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If potentiometers are used for position detection, then the device complexity is low, but the reliability deteriorates due to wear causing data errors

Engineering Contradiction:

Improvedevice complexityVSAvoidposition information reliability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent substitutes the wear-prone mechanical potentiometer with a non-contact magnetic sensing system. The magnetic encoding chip reads position information from the magnet through magnetic field interaction without physical contact, eliminating wear-related failures and significantly improving reliability while maintaining acceptable device complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The magnetic encoding chip performs self-calibration and error correction through feedback mechanisms. The system automatically compensates for potential measurement errors and maintains high reliability without requiring external intervention or maintenance, effectively making the system self-correcting.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If magnetic encoding chip is used to sense position, then the measurement precision is improved, but the device complexity increases

Engineering Contradiction:

Improveposition information accuracyVSAvoiddevice complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The magnetic encoding chip serves multiple functions: it detects magnetic field changes, converts them to position information, and provides feedback to the control module. This multi-functionality consolidates what would otherwise require separate components, achieving high measurement precision while limiting the increase in overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the magnet and magnetic encoding chip into an integrated position sensing system. The magnet is mounted on the rotating shaft while the magnetic encoding chip is positioned nearby, creating a compact assembly that achieves precise measurement without requiring separate complex mechanisms for each function.

Inventive Principle:

Principle #5Merging (Combining)

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 system accurately acquires and controls the position of the servo, reducing errors and maintaining precision over time by using a magnetic encoding chip to sense the rotation angle, thereby improving the accuracy of servo operations.

Implementation Method 1

The main control module controls, via the detection control terminal and the detection control receiving terminal, the magnetic encoding chip to sense information of changing magnetic field generated when the magnet rotates

Methodology Applied

Scientific EffectMagnetic field sensing: Magnetic Field

Data Source

PatentUS10627806B2Servo control system and robot

Publication Date: 2020.04.21 UBTECH ROBOTICS CORP LTD

AI summary

The present invention provides a servo control system and a robot. The servo control system is applied to a servo, and includes a main control module including an angle information receiving terminal and a detection control terminal; and an angle collection module including a magnet and a magnetic encoding chip spaced apart from the magnet by a certain distance. The magnet is connected to a rotation output shaft of the servo. The magnetic encoding chip includes an angle information output terminal and a detection control receiving terminal. In the above manner, the present invention can accurately acquire position information of a servo.