Magnetic Pump Stroke Detection Using Coil Self-Induction
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Solution Overview
Problem
Existing magnetic pumps face challenges in monitoring and controlling the stroke movement of the pressure element without additional electronic components, leading to increased production costs and environmental impact.
Innovation Solution
A method and pump design that utilizes the self-induction of the coil to detect the stroke movement by calculating differential inductance, allowing for sensorless control of the pressure element's position and movement, thereby adjusting the magnetic force to prevent excessive deflection of the diaphragm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If displacement sensors are used to monitor and control stroke movement, then measurement precision and control reliability are improved, but device complexity and production costs increase
Solution Approach 1:
The patent replaces mechanical displacement sensors with an electrical measurement system that uses the coil's inductance characteristics. By measuring changes in inductance caused by magnetic core position changes during stroke movement, the system achieves precise position detection without additional mechanical sensing components.
Solution Approach 2:
The patent utilizes the coil's own inductance property as the measurement parameter for stroke detection. The coil serves dual functions: generating the magnetic field for actuation and providing the inductance signal for position feedback, eliminating the need for separate sensing components.
2Reliability
If displacement sensors are used to monitor and control stroke movement, then control reliability is improved, but production costs and environmental impact worsen
Solution Approach 1:
The patent makes the coil multi-functional by using it both for magnetic actuation and for position sensing through inductance measurement. This universal use of the existing coil component eliminates the need for additional sensors, reducing production costs and environmental impact while maintaining reliable stroke control.
3Ease of operation
If constant force is transmitted to the diaphragm, then ease of operation is improved, but the diaphragm may deflect excessively when pressure in the conveying chamber is low, reducing reliability
Solution Approach 1:
The patent implements feedback control by continuously monitoring the coil inductance, which reflects the magnetic core position and thus the stroke phase. Based on this feedback, the control system adjusts the voltage applied to the coil to modulate the magnetic force, preventing excessive diaphragm deflection while maintaining reliable stroke movement control.
Solution Approach 2:
The patent transitions from constant force transmission to dynamic force adjustment. By varying the voltage to the coil based on real-time inductance measurements, the magnetic force transmitted to the diaphragm is dynamically adjusted to match the actual pressure conditions in the conveying chamber, preventing excessive deflection.
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 cost-effective, safe, and resource-saving monitoring and control of the stroke movement, optimizing energy efficiency and reducing wear on the diaphragm.
Implementation Method 1
a magnetic field, generated by an electric current flowing in the coil
Implementation Method 2
utilizes the self-induction of the coil to detect the stroke movement by calculating differential inductance
Data Source
AI summary
A process for operating a pump, the pump having a conveying chamber for conveying a fluid, the pump having a displacement element, the displacement element delimiting the conveying chamber at least in sections, so that a change in the position or location of the displacement element causes a change in the volume of the conveying chamber, the pump having a drive, the drive having a coil through which an electric current is conductible, the coil having an ohmic resistance value RDC and an inductance Lcoil, the drive includes a pressure element and a coupling device, the pressure element and the coil being configured and arranged such that a magnetic field, generated by an electric current flowing in the coil causes a stroke movement of the pressure element along a longitudinal axis from an initial position P1 to an end position P2.