Oscillating Displacement Pump Electrodynamic Drive
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Solution Overview
Problem
Existing oscillating positive displacement pumps lack the ability to regulate stroke speed, position, or acceleration efficiently, and suffer from poor energy efficiency and manageability due to reliance on reluctance drives with high magnetic inertia and non-linear force-current correlations.
Innovation Solution
The design incorporates an electrodynamic drive with a pole-piece-free coil configuration, where Lorentz force acts directly between permanent magnets and coils, enabling active bidirectional operation and precise control through a measurement and control unit processing position and current signals, allowing for dynamic regulation of stroke position, speed, and acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a reluctance drive is used, then the pump can operate with a simple drive structure, but the stroke speed, position, and acceleration cannot be regulated efficiently due to high magnetic inertia and non-linear force-current correlations
Solution Approach 1:
The patent replaces the reluctance drive (electromagnetic system with high magnetic inertia) with an electrodynamic drive system that uses permanent magnets and coils to generate Lorentz force. This substitution eliminates the magnetic inertia problem and enables linear force-current correlation, allowing efficient regulation of stroke speed, position, and acceleration while maintaining drive structure simplicity.
Solution Approach 2:
The patent changes the fundamental operating parameters of the drive system by using permanent magnets with alternating polarity and coils that can be independently controlled. This allows the force-current relationship to become linear and enables independent control of stroke speed, position, and acceleration, resolving the regulation capability issue while keeping the drive structure relatively simple.
2Adaptability or versatility
If a reluctance drive with spring-return mechanism is used, then the pump can achieve bidirectional movement, but energy efficiency deteriorates due to high magnetic inertia and the need for return springs
Solution Approach 1:
The patent replaces the spring-return mechanism with an electrodynamic drive system using permanent magnets and coils. The Lorentz force generated by the interaction between the magnetic field and coil current provides bidirectional movement without requiring mechanical return springs, eliminating the energy losses associated with magnetic inertia and spring mechanisms while maintaining adaptability for bidirectional operation.
Solution Approach 2:
The patent uses periodic reversal of current direction in the coils to achieve bidirectional movement of the mobile part. By alternating the current direction, the Lorentz force reverses, enabling the mobile part to move back and forth without mechanical return springs, thus improving energy efficiency while maintaining bidirectional movement capability.
3Ease of operation
If permanent magnets and coils are arranged on the mobile part, then direct force reversal is achieved through current reversal, but the drive complexity increases
Solution Approach 1:
The patent uses permanent magnets with alternating polarity arranged on the mobile part, creating an asymmetric magnetic field configuration. This asymmetric arrangement, combined with coils having alternating winding directions, enables direct force reversal through simple current reversal without requiring complex mechanical switching mechanisms, thus improving ease of operation while keeping drive configuration manageable.
Solution Approach 2:
The patent inverts the conventional arrangement by placing permanent magnets on the mobile part rather than on the stator. This inversion allows the magnetic field to move with the mobile part, and by reversing the current direction in the coils, the Lorentz force direction is directly reversed, simplifying the force reversal mechanism while the alternating polarity arrangement keeps the overall configuration symmetric and manageable.
4Measurement precision
If guide members are added to constrain mobile part movement, then position control is improved, but device complexity increases
Solution Approach 1:
The patent introduces guide members as intermediary elements between the mobile part and the pump head. These guide members constrain the mobile part to move only in the axial direction, improving position control and measurement precision. The guide members act as mediators that translate the electrodynamic drive's force into precise linear motion without requiring complex positioning mechanisms, thus improving measurement precision while adding minimal structural complexity.
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 approach results in a pump with quicker, more dynamic, and precise operation, achieving direct force reversal and efficient energy use by linearly correlating drive current and force, outperforming conventional reluctance drives in regulation and energy efficiency.
Implementation Method 1
there is a so-called electrodynamic drive with a permanent magnet and a coil where Lorentz force comes into effect
Implementation Method 2
magnetic fields with an alternating direction flow through the plurality of energized coils with alternating winding directions
Data Source
AI summary
An oscillating positive displacement pump with at least one mobile part arranged to be movable relative to a fixed part. The mobile part is driven and drives a displacement element of the positive displacement pump. An electrodynamic drive is provided as a drive, on which a plurality of coils and permanent magnets are provided that are arranged on the mobile part of the drive respectively, and at least one guide member is provided on the drive, which allows the mobile part to move only along a degree of translation freedom. The positive displacement pump is designed as a diaphragm pump, which is associated with a measurement and control unit with a data storage and data processor, which processes a position signal of the mobile part and the strength of the drive current as a measured and/or control variable. An arrangement of a plurality of such positive displacement pumps and a method of operating at least one such oscillating positive displacement pump are also provided.