Cable Carriage Eddy-Current Braking for Speed-Proportional Control
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Solution Overview
Problem
Existing cable and rail systems with integrated braking mechanisms fail to provide consistent and comfortable braking for users or objects moving along cables or rails, especially on steeper slopes, where the braking force is insufficient, leading to acceleration and safety issues.
Innovation Solution
A carriage system equipped with a wheel having a rotation shaft, non-magnetic braking masses, and magnetic masses that generate a magnetic field, along with a self-adjusting device to move the braking masses closer to the magnetic masses as speed increases, creating eddy currents for a braking force proportional to the speed, and a passive block braking system for additional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant braking force mechanism is used, then the braking system is simple to manufacture, but the braking force is insufficient on steeper slopes leading to acceleration and safety issues
Solution Approach 1:
The braking system transitions from a static constant braking force to a dynamic speed-proportional braking force. The centrifugal masses automatically adjust the braking force based on the carriage's speed, creating a dynamic response that maintains safety across varying slope conditions without requiring complex external control systems.
Solution Approach 2:
The braking force parameter is changed from a constant value to a variable value that changes with speed. As speed increases, the centrifugal masses move outward, increasing the braking force proportionally. This parameter change ensures the braking system remains effective on steeper slopes while preventing excessive acceleration.
2Productivity
If manual setup and adjustment of braking systems is required, then the system can be simplified, but setup times are increased and human error may occur
Solution Approach 1:
The braking system performs self-adjustment through the centrifugal masses that automatically respond to speed changes. No manual setup or adjustment is required - the system serves itself by automatically configuring the appropriate braking force based on real-time operating conditions, eliminating setup time and human error.
Solution Approach 2:
The system incorporates automatic feedback through the centrifugal mechanism. The braking force is continuously adjusted based on feedback from the carriage's speed, creating a closed-loop control system that eliminates the need for manual setup and ensures optimal braking performance from the start of operation.
3Reliability
If braking force is increased to prevent acceleration on steep slopes, then safety is improved, but the braking system becomes less comfortable for users with different weights
Solution Approach 1:
The braking force dynamically adapts to the user's weight and speed conditions. Lighter users traveling at lower speeds experience gentler braking, while heavier users or those traveling faster experience proportionally stronger braking. This dynamic adjustment maintains safety for all users without compromising comfort.
Solution Approach 2:
The braking force parameter changes proportionally with speed and user weight. Instead of applying a fixed high braking force that would be uncomfortable for lighter users, the system adjusts the braking parameter to match the actual operating conditions, ensuring both safety and comfort across all user scenarios.
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 ensures consistent and comfortable braking, eliminating the need for manual setup and preventing excessive speed, allowing multiple users or objects to reach the same speed safely, regardless of weight or slope, while reducing human error and ensuring safety through proportional and adaptive braking.
Implementation Method 1
magnetic masses configured to generate a magnetic field... The self-adjusting device is configured for moving the braking masses close to the magnetic masses... in such a way that the magnetic masses generate eddy currents by electromagnetic induction defining a slowing force proportional to the forward speed of the carriage
Implementation Method 2
magnetic masses generate eddy currents by electromagnetic induction defining a slowing force proportional to the forward speed of the carriage
Implementation Method 3
a self-adjusting device, connected to the braking masses and positioned inside the rotation shaft of the at least one wheel, configured for moving the braking masses close to the magnetic masses along a direction parallel to an axis of extension of the rotation shaft, as a function of an increase of a speed of rotation
Data Source
AI summary
Described is a carriage (1) for moving on a cable and/or rail comprising: a wheel (2) equipped with its own rotation shaft (3) and configured to rotate on a cable (C) and/or rail; braking masses (4) positioned parallel to the wheel (2) and made of non-magnetic material; magnetic masses (5) configured to generate a magnetic field; and a self-adjusting device (6), connected to the braking masses (4) and positioned inside the rotation shaft (3) of the wheel (2), configured for moving the braking masses (4) close to the magnetic masses (5) along a direction (D) parallel to an axis of extension of the rotation shaft (3), as a function of an increase in a speed of rotation of a wheel (2), in such a way that the magnetic masses (5) generate eddy currents by electromagnetic induction defining a slowing force proportional to the feed speed of the carriage (1).