Actuator Control System with Dampers for Impact Absorption
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Solution Overview
Problem
Conventional electric actuators suffer from durability issues due to shock and impact during pressing operations, and require complex control systems and expensive detectors to manage position and speed, leading to increased production costs.
Innovation Solution
An actuator control system with a piston and piston rod that uses end and piston dampers, a flexible coupling mechanism, and a simple relay circuit to absorb impact and limit current, eliminating the need for complex control systems and detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electric actuators are used for pressing operations, then the actuator can perform the pressing function, but the shock and impact during operation deteriorate the durability of the actuator
Solution Approach 1:
The patent introduces a damper mechanism that is pre-installed in the actuator system to absorb shock and impact before they can reach and damage the screw shaft and other critical components. The damper acts as a cushioning element that deformably absorbs the energy of sudden impacts during pressing operations, thereby protecting the actuator from durability deterioration.
2Measurement precision
If detectors such as encoders and resolvers are provided to control position and operation speed, then the control precision is improved, but the production cost becomes expensive
Solution Approach 1:
The patent extracts and removes the expensive detector components (encoders and resolvers) from the actuator system while maintaining the essential control functionality. By eliminating these costly measurement devices and using alternative control methods, the patent achieves the same control objectives at a lower production cost.
Solution Approach 2:
The patent replaces expensive, complex detectors with simpler, cheaper sensing mechanisms that can achieve the required control precision without the need for high-cost encoders and resolvers. This substitution uses more economical components to accomplish the same measurement and control functions.
3Reliability
If a control apparatus is provided to limit current for servo motor, then the rotary driving source is protected from overcurrent, but the device complexity increases
Solution Approach 1:
The patent implements a self-service current limiting mechanism where the actuator system automatically regulates and limits the current to the servo motor through inherent control logic and simple circuitry. This self-regulating system protects the rotary driving source from overcurrent without requiring complex external control apparatus, achieving protection through the system's own built-in capabilities.
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 effectively absorbs impact, enhances durability, reduces production costs, and prevents overcurrent issues, allowing for efficient operation without complex control systems or expensive detectors.
Implementation Method 1
a piston damper 56a, which makes contact with the connecting member 60, is provided for the piston 22
Implementation Method 2
the piston 22 and the connecting member 60, which are connected to one another, are provided displaceably with respect to each other in the axial direction of the feed screw shaft 18
Data Source
AI summary
An actuator control system comprises an electric actuator, a driver, and a controller. The electric actuator is provided with a buffering mechanism which absorbs impact applied to a piston rod. The buffering mechanism includes piston dampers which absorb impact applied to a piston, a first end damper which is provided at an end of a housing facing the piston, and a second end damper which is provided on a rod cover separated from the housing by a predetermined distance.