Pneumatic Servo-Actuator Spool Control for Slide Flow Distributor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing slide flow distributors require large and powerful motors to achieve high dynamics and exact spool positioning due to high pressure differences and forces generated during air flow modulation, leading to inefficient systems.
Innovation Solution
A pneumatic servo-actuator system utilizing a Voice Coil Motor (VCM) is introduced, which enhances the system's speed and dynamic modulation, allowing for precise spool control with reduced power consumption, and is used in conjunction with a linear motor to achieve faster spool movement and high position accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a traditional Step Motor is used to move the spool, then the system can achieve spool displacement, but the time required for spool displacement is long and power consumption is high
Solution Approach 1:
The patent introduces a pneumatic servo-actuator system that uses compressed air to assist the linear motor in moving the spool. The pneumatic system provides additional force during spool displacement, enabling faster response times while reducing the power burden on the electric motor, thus resolving the contradiction between speed and power consumption
Solution Approach 2:
The patent implements a dynamic control system that adjusts the pneumatic pressure and motor output based on the spool's position and velocity. This dynamic adjustment optimizes the force application throughout the displacement process, achieving rapid spool movement with minimized energy consumption
2Speed
If the spool displacement speed is increased to improve dynamics, then the system response is faster, but high pressure differences generate large forces requiring a more powerful motor
Solution Approach 1:
The pneumatic servo-actuator delivers high force rapidly during spool displacement by utilizing compressed air pressure. This pneumatic force assistance enables the spool to overcome the high pressure differences generated during fast displacement without requiring an oversized motor, thus achieving high speed with moderate motor force
Solution Approach 2:
The system pre-charges the pneumatic actuator with compressed air before spool displacement is needed. When spool movement is required, the pre-loaded pneumatic pressure is immediately applied to assist the motor, enabling rapid acceleration without waiting for force buildup, thus achieving high speed response with limited motor force
3Force
If a motor of great dimensions and power is used to control the spool, then the spool can be displaced against high pressure differences, but the motor dimensions and power consumption increase
Solution Approach 1:
The pneumatic servo-actuator serves as a force amplifier that multiplies the motor's output force through pneumatic pressure. This allows a small-power motor to generate large spool control forces by combining electric motor torque with pneumatic pressure forces, thus achieving high force with low power consumption
Solution Approach 2:
The pneumatic system acts as an intermediary between the motor and the spool, transferring and amplifying the motor's force through compressed air. This intermediary mechanism enables force multiplication without requiring a proportionally larger motor, thus achieving high force output with low power input
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 pneumatic servo-actuator system significantly reduces the time needed for spool displacement by up to one eighth compared to traditional Step Motor configurations, while maintaining low power usage and achieving high position accuracy with improved performance.
Implementation Method 1
A pneumatic servo-actuator system utilizing a Voice Coil Motor (VCM) is introduced, which enhances the system's speed and dynamic modulation
Implementation Method 2
Said servo-actuator, by exploiting the advantages linked to the presence of compressed air, allows to improve both the 'peak' speed of the system and its dynamic modulation
Data Source
AI summary
A slide flow distributor to direct and modulate a gaseous fluid, in inlet and outlet. This regulation is carried out by means of a spool, which conveys compressed air in a determined charging direction and puts in communication the other chamber with the environment at the same time. This is a servo-actuator which can be used in the field of pneumatic systems of valve actuation. It has a specific pneumatic servo-actuating system using compressed air. This distributor uses a linear motor using a new pneumatic servo-actuator which generates a force in the same direction of the axial force of the motor, with the result that the spool is accelerated in a predetermined direction. The pneumatic servo-actuator is made of a profiled body, a plurality of balls and corresponding elastic means which press the plurality of balls on the side surface of the profiled body.