Magnetic Roller Shutter Position Detection with Different-Tooth Gears

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Solution Overview

Problem

Existing motorized roller shutter systems face challenges with complex and time-consuming mechanical limit setting, thermal drift, high cost of electronic systems, and power failure issues that require backup batteries for position tracking.

Innovation Solution

A magnetic device using gears with different tooth counts and diametrically magnetized gears and detectors to track shutter position, eliminating the need for backup batteries and simplifying limit setting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If mechanical limit systems with sliders and threaded rods are used, then the roller shutter can detect limit positions, but the setting operation becomes complicated and time-consuming

Engineering Contradiction:

Improvelimit position detectionVSAvoidsetting operation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces the mechanical limit system with sliders and threaded rods with an electronic system using a rotary encoder and control unit. The encoder converts angular mechanical movement into digital electrical impulses, allowing the control unit to precisely determine shutter position and limit settings without manual slider adjustment, thereby eliminating the time-consuming setting operation while maintaining accurate limit detection

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the parameter representation from mechanical position (slider location on threaded rod) to electrical parameters (digital impulses from encoder). This allows the limit positions to be stored as electrical values in memory rather than mechanical configurations, enabling quick reconfiguration without physical adjustment

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If electronic systems with rotary encoders are used, then the limit setting becomes simple, but the system cost increases significantly

Engineering Contradiction:

Improvelimit setting simplicityVSAvoidsystem cost

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent integrates the rotary encoder and control unit into the existing motor assembly, allowing the same components to serve both motor control and position tracking functions. This multi-functionality reduces the need for separate dedicated limit-setting components, thereby simplifying the overall system while maintaining ease of operation

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the encoder, control unit, and memory into a single integrated assembly that works with the motor. This merging of components reduces the overall system complexity and cost compared to having separate mechanical limit devices and electronic control systems

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If electronic systems with dedicated control units are used, then position tracking is continuous, but the system becomes vulnerable to power failure issues

Engineering Contradiction:

Improveposition tracking continuityVSAvoidpower failure impact

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements preliminary action by continuously updating and storing the current shutter position in the control unit's memory during normal operation. This ensures that position information is already recorded and available immediately after power restoration, eliminating the need for backup batteries or manual repositioning

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system performs self-service by automatically maintaining position data in its own memory without requiring external backup power sources. The control unit continuously tracks and stores position information using the existing motor power supply, making the system self-sufficient during power interruptions

Inventive Principle:

Principle #25Self-service

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

Enables easy and quick limit setting, compact design, and immediate position tracking after power restoration without backup batteries, ensuring reliable operation during power outages.

Implementation Method 1

A magnetic device using gears with different tooth counts and diametrically magnetized gears and detectors to track shutter position

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentEP4606986A1Magnetic device for motorized roller shutters for windows and/or doors

Publication Date: 2025.08.27 L N R SRL

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Figure 3~4

AI summary

Magnetic device (100) for a motorized roller shutter (S) for windows or doors; the magnetic device (100) comprises a boxed frame (1), an endless screw (2) housed in the boxed frame (1) and rotatable around an axis of rotation (Z2), a first gear (3) and a second gear (4) meshing with the endless screw (2) so that the gears (3, 4) are driven into rotation by the endless screw (2); wherein the gears (3,4) have a different number of teeth (30, 40) so that the two gears (3,4) rotate with different angular velocities; the magnetic device (100) comprises a first magnet (53) applied to the first gear (3), a second magnet (54) applied to the second gear (4), a first magnetic detector (63) suitable for detecting the magnetic field (B1) generated by the first magnet (53) and a second magnetic detector (64) suitable for detecting the magnetic field (B2) generated by the second magnet (54).