Electromagnetic Brake Force Detector with Load Cell
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Solution Overview
Problem
Existing electromagnetic brake systems in elevator systems cannot quantitatively assess the brake force, leading to decreased safety due to reduced recovery force from worn-out brake spring components.
Innovation Solution
A detector system using load sensors to measure the recovery force of brake springs and compare it against predefined limits, generating signals for appropriate brake force judgment, which includes a solenoid to release the brake force electromagnetically and a controller to assess and communicate the brake condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lining portion of the brake lever is worn out, then the brake force decreases, but the existing detector cannot quantitatively assess the brake force
Solution Approach 1:
The patent replaces the mechanical contact-based detection system with a load sensor that directly measures the recovery force of the brake spring. This substitution enables quantitative measurement of brake force through electrical signals from the load sensor, providing precise assessment of brake performance and early detection of lining wear before safety is compromised.
2Measurement precision
If a load sensor is added to measure recovery force, then quantitative brake force assessment is enabled, but device complexity increases
Solution Approach 1:
The load sensor is integrated into the existing brake spring structure, serving multiple functions: measuring recovery force, detecting lining wear condition, and providing early warning signals. The judgment device compares load sensor output against stored reference values to determine brake abnormality, enabling a single addition to perform comprehensive brake system monitoring.
3Loss of information
If the brake lining is worn, then the compressive deformation of the brake spring decreases, but this cannot be detected quantitatively
Solution Approach 1:
The load sensor provides continuous feedback on the recovery force of the brake spring, which directly reflects the compressive deformation and lining wear condition. The judgment device processes this feedback by comparing current load values against reference values stored in memory, generating early warning signals when wear thresholds are approached, thereby preventing information loss about brake condition.
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 quantitative assessment of brake force, improving safety by detecting issues early and allowing for timely maintenance, reducing user resentment and ensuring elevator operation safety.
Implementation Method 1
the brake piece is driven away from the member for braking against the recovery force of the brake spring by means of an electromagnetic attracting force caused by excitation of a solenoid
Implementation Method 2
a brake force is generated by pressing a brake piece on a member for braking with the recovery force based on the elastic deformation of the brake spring
Data Source
AI summary
A detector for an electromagnetic brake, for example used in an elevator system, that, by quantitative judgment, determines whether the brake force of the electromagnetic brake is appropriate. Load cells for detecting the recovery forces of brake springs are arranged between brake springs, which energize brake arms with brake shooes installed on them toward the side of brake wheel, and spring sheets, which hold brake springs in a compressive deformed state, and, at the same time, judgment part judges whether the brake force of electromagnetic brake 4 is outside a prescribed normal range based on the outputs of load cells. If the brake force of electromagnetic brake is outside the normal range, judgment part sends a signal, for example to a monitoring center.