Electromechanical Rotation Limiter for Multi-Turn Wheel Control
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Solution Overview
Problem
Existing rotation limiting systems for machines with rotating wheels or gears are limited to less than 360° and require either software-based solutions that are unreliable in harsh environments or additional mechanical hardware, which increases complexity and cost.
Innovation Solution
A latching relay and additional direction switches are integrated with the rotating wheel or gear, allowing for rotation limiting beyond 360° without software or cumbersome gearboxes, using high-reliability safety relays to ensure accurate stopping even in failure scenarios, and can be housed away from the machine to protect against harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If software-based systems are used to count revolutions and control rotation beyond 360°, then rotation control capability is improved, but system reliability deteriorates due to electronics and programming requirements
Solution Approach 1:
The patent replaces software-based electronic counting systems with a purely mechanical relay-based system. The latching relay mechanically remembers the number of revolutions through its internal state, eliminating the need for electronic memory, programming, and complex circuitry while maintaining the ability to control rotation beyond 360°.
Solution Approach 2:
The latching relay automatically counts revolutions and controls the motor without external intervention. Each time the limit switch is triggered, the relay automatically latches to the next state, providing self-service revolution counting and control without requiring software processing or electronic memory.
2Adaptability or versatility
If gearboxes are added to reduce range of motion below 360° for use with simple limit switches, then rotation limiting capability is improved, but device complexity increases
Solution Approach 1:
The patent eliminates the need for gearboxes by using a latching relay system that can directly control multi-revolution rotation. The relay's internal memory mechanism replaces the complex gear reduction system, providing a simpler mechanical solution that maintains rotation limiting capability without adding mechanical complexity.
3Measurement precision
If software systems are used to remember wheel location while powered off, then rotation accuracy is improved, but reliability deteriorates due to additional failure points
Solution Approach 1:
The latching relay automatically maintains memory of the wheel's rotational position during power-off periods through its inherent mechanical latching state. This self-service memory function eliminates the need for electronic memory devices, batteries, or complex power management circuits, thereby improving reliability while maintaining rotation 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
Enables reliable rotation limiting across a wide range without additional mechanical hardware or software complexity, maintaining operation in hostile environments and reducing points of failure, thus expanding the applicability of machinery in various conditions.
Implementation Method 1
When the machine is powered off, the latching relay remembers the state of the rotating wheel or gear
Implementation Method 2
When the direction switches are triggered by the protrusion on the wheel or gear, they switch the latching relay output to match the direction of movement
Data Source
AI summary
An apparatus and method for rotating a part includes a sequence of relays to rotate the part given number of degrees. The apparatus does not require software or complex mechanical gearing.