Reluctance Linear Drive for Piston Pump with Open Coil Core
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Solution Overview
Problem
Existing electromagnetic linear drives for piston pumps are inefficient due to high material costs, power consumption, and limited frequency and stroke adjustability, making them unsuitable for vehicle control systems where precise fluid volume control is needed.
Innovation Solution
The use of reluctance drive devices with stators having coil windings and open coil cores, which generate magnetic flux to move a drive piston in opposite directions, allowing for adjustable frequency and stroke, reducing energy requirements and eliminating the need for permanent magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a permanent magnet ring is used in the electromagnetic drive device, then the magnetic field strength is improved, but the material cost increases significantly
Solution Approach 1:
The patent removes the permanent magnet ring from the electromagnetic drive device, extracting the expensive magnetic component while maintaining functionality through alternative means (electromagnetic coils alone)
Solution Approach 2:
The patent replaces expensive permanent magnets with cheaper electromagnetic coils that can be energized temporarily to generate the required magnetic field, eliminating the need for costly magnetic materials
2Force
If a permanent magnet ring is used in the electromagnetic drive device, then the magnetic field strength is improved, but the power consumption increases
Solution Approach 1:
The patent removes the permanent magnet ring that caused high power consumption, extracting the problematic magnetic component while maintaining drive functionality through coil-based electromagnetic actuation
3Use of energy by moving object
If a rotating electric motor with eccentric actuation is used, then the power consumption is reduced, but the volume flow adjustability is limited
Solution Approach 1:
The patent implements a linearly moving drive piston that can dynamically adjust both its position and stroke length, enabling continuous variation of volume flow from minimum to maximum capacity, unlike fixed eccentric rotation
Solution Approach 2:
The patent changes the actuation parameter from fixed rotational eccentricity to variable linear displacement, allowing independent control of piston position and stroke to achieve precise volume flow adjustment
4Temperature
If the coil receptacle is open toward the drive piston, then the cooling efficiency is improved, but the magnetic flux containment may be reduced
Solution Approach 1:
The patent applies different properties to different regions: the coil receptacle is open in the radial direction toward the drive piston for cooling, while the coil core provides magnetic flux containment where needed, creating localized functional zones
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 solution enables adjustable volume flow in piston pumps, reduces noise and mechanical complexity, extends service life, and decreases material usage and installation space, while maintaining robustness and efficient cooling.
Implementation Method 1
when the coil winding is supplied with current, a magnetic flux is generated in the coil core
Implementation Method 2
the coil core seeks to force the drive piston, or an armature element, assigned to the coil winding, of the drive piston, into a position with minimum reluctance
Implementation Method 3
the coil core seeks to force the drive piston into a position with minimum reluctance
Data Source
AI summary
A linear drive, in particular for a piston pump, includes a first electromagnetic drive device, a second electromagnetic drive device, and a drive piston configured to be moved in an axial direction by the drive devices. The first drive device and the second drive device are each in the form of a reluctance drive device. The reluctance drive devices each have a stator with a stator coil that engages around the drive piston in a circumferential direction. The reluctance drive devices each also have a coil core with a coil receptacle, open in a radial direction toward the drive piston, for the coil winding. A piston pump arrangement includes the linear drive.