Eccentric Gerotor Pump with Segmented Magnetic Actuators
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Solution Overview
Problem
Integrated eccentric motors and pumps face issues such as locking-load conditions due to normal forces, difficult assembly of electrical windings, incomplete sealing, and unpredictable rotor movement due to lack of path restriction, leading to inefficiencies and potential damage.
Innovation Solution
The design incorporates a cylindrical crankshaft passing through an inner gerotor with modular magnetic actuators and axially overlapping shutter plates, creating a robust magnetic field to displace lobes within recesses, ensuring efficient fluid handling while preventing normal force-induced jamming and enhancing assembly and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inlet and outlet guides are centered about the axis of rotation, then the guides are easier to manufacture and assemble, but the eccentric rotation causes the guides to engage the stator with normal force, creating locking-load conditions that block rotor rotation
Solution Approach 1:
The inlet and outlet guides are positioned asymmetrically relative to the stator, with their circumferences offset from the stator's outer circumference. This asymmetric positioning ensures that during eccentric rotation, the guides do not engage the stator with normal force, eliminating locking-load conditions while maintaining ease of manufacture and assembly.
2Device complexity
If integral electrical windings are used in the stator, then the motor structure is more compact, but the windings are difficult to assemble and are not fully sealed, allowing fluid to bathe the windings
Solution Approach 1:
The stator is segmented into modular segments with magnetic actuators positioned between them. This segmentation eliminates the need for integral electrical windings, making assembly easier while providing natural sealing between segments that prevents fluid from contacting the magnetic actuators and windings.
Solution Approach 2:
Magnetic actuators serve as intermediaries between the electrical system and the mechanical components. The magnetic actuators are positioned in air gaps between stator segments, acting as a barrier that prevents fluid from reaching the electrical windings while still transmitting magnetic force to drive the rotor.
3Adaptability or versatility
If there is no restriction to the physical travel path of the rotor, then the rotor has greater freedom of motion, but the rotor unpredictably reacts to magnetic or shock load, causing instability
Solution Approach 1:
The crankshaft mechanism provides mechanical feedback that constrains the rotor's travel path to a predetermined eccentric orbit. This feedback mechanism ensures that the rotor responds predictably to magnetic forces and shock loads, maintaining operational stability while still allowing the necessary freedom of motion for pumping action.
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 configuration eliminates locking-load conditions, improves assembly and sealing, and provides predictable operation, resulting in a more efficient and reliable fluid handling system with reduced risk of damage from over-pressure.
Implementation Method 1
The plurality of magnetic actuators is arranged to be energized in sequence to create magnetic fields
Data Source
AI summary
A pump, including: inner gerotor; a crankshaft; an outer gerotor; an inlet assembly with inlet ports; an outlet assembly with outlet ports; and magnetic actuators. The inner gerotor includes lobes and a central opening. The crankshaft: passes through the central opening; is rotatable about an axis of rotation; and includes a first longitudinal axis not co-linear with the axis of rotation. The outer gerotor includes recesses. The magnetic actuators are sequentially energized to create magnetic fields to displace the inner gerotor with respect to the crankshaft to: displace a first lobe out of a first recess and draw fluid through an inlet port into the first recess; and displace a second lobe into a second recess and expel second fluid out of the second recess and through an outlet port.