Motor-Direct-Drive Servo Valve With Magnetic Null Reset
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Solution Overview
Problem
Two-dimensional servo valves in existing technologies face issues with complex electrical-mechanical conversion, contact wear, and high-pressure dynamic sealing when resetting to a null position, primarily due to the use of springs for resetting the servo valve body.
Innovation Solution
A two-dimensional motor-direct-driving electro-hydraulic servo valve with an adjustable null position is designed, incorporating a slide valve assembly, a two-dimensional motor, a magnet resetting-to-null mechanism, and a displacement sensor, which allows for direct motor-driven valve core rotation and axial resetting without contact, utilizing a magnet mechanism to simplify the electrical-mechanical conversion and reduce wear, and a wet rotor structure for improved sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring mechanism is used to reset the servo valve body to the null position, then the valve can be reset, but complex electrical-mechanical conversion, contact wear, and high-pressure dynamic sealing issues occur
Solution Approach 1:
The patent extracts and removes the spring resetting mechanism from the system, replacing it with a direct motor-driven structure. The motor directly drives the valve core through a magnetic coupling mechanism, eliminating the need for complex transmission mechanisms and spring-based resetting, thereby simplifying the overall structure and reducing contact wear
Solution Approach 2:
The patent replaces the mechanical spring-based resetting system with an electromagnetic motor-driven system. The motor uses magnetic fields to drive the valve core, substituting mechanical contact and spring forces with electromagnetic forces, which eliminates contact wear and simplifies the electrical-mechanical conversion process
2Ease of operation
If a transmission mechanism is used to connect the motor to the servo valve body, then the valve can be driven, but contact wear and high-pressure dynamic sealing problems occur
Solution Approach 1:
The patent replaces the mechanical transmission mechanism with a direct magnetic coupling drive. The motor's magnetic field directly acts on the valve core through magnetic attraction and repulsion, eliminating mechanical gears, shafts, and contact surfaces, thereby completely avoiding contact wear while maintaining full driving capability
3Reliability
If a spring mechanism is used for resetting, then the null position can be achieved, but high-pressure dynamic sealing issues arise
Solution Approach 1:
The patent removes the spring resetting mechanism that caused sealing issues and replaces it with a direct motor-driven magnetic coupling system. The motor can precisely control the valve core position and reset it to the null position without requiring high-pressure dynamic sealing, thereby improving sealing reliability
Solution Approach 2:
The patent substitutes the mechanical spring resetting system with an electromagnetic control system. The motor uses magnetic fields to achieve precise positioning and resetting of the valve core, eliminating the need for mechanical springs and their associated high-pressure dynamic sealing requirements
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
This design simplifies the electrical-mechanical conversion process, reduces contact wear, and enhances the reliability and service life of the servo valve by eliminating high-pressure dynamic sealing issues, while the wet rotor structure improves heat dissipation and overall performance.
Implementation Method 1
a magnet resetting-to-null mechanism... configured to reset the valve core to the null position
Implementation Method 2
the two-dimensional motor... is configured to drive the valve core to rotate
Data Source
AI summary
An electro-hydraulic servo valve, which has an adjustable null position and can be directly driven by the motor, is provided and includes four parts: a slide valve assembly, a two-dimensional motor, a magnet resetting-to-null mechanism, and a displacement sensor, and the four parts are set coaxially arranged. The slide valve assembly is a conventional two-dimensional servo valve structure. The two-dimensional motor may directly drive the valve core to rotate to further control a size of an opening opened by a valve. The magnet resetting-to-null mechanism is configured to reset the valve to the null position. The displacement sensor may monitor a position of the valve core in real-time and feedback signals to achieve closed-loop controlling.