Axial-Flow Pump Motor With Eccentric Cam to Reduce Height and Weight
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Solution Overview
Problem
Existing pump arrangements often fail to minimize space and weight while maintaining efficiency, particularly in applications like automobile refrigeration systems where low overall height and high pump power with low energy consumption are crucial.
Innovation Solution
The design incorporates an axial-flow machine with a rotor, shaft, and stator arrangement featuring eccentric components and compensating masses, which reduces overall height and weight by eliminating additional eccentric disks and optimizing torque transfer and vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If radial-flow motors are used for pump arrangements, then drive power and efficiency can be maintained, but overall height and space requirement increase
Solution Approach 1:
The patent transitions from radial-flow motor design to axial-flow motor design, changing the dimensional orientation of fluid flow and magnetic field interaction. This dimensional change allows the motor to achieve the same drive power with reduced overall height, as the axial configuration packs the magnetic circuit and fluid path more efficiently in the vertical direction.
Solution Approach 2:
The patent integrates the drive means and pump function into a single axial-flow machine unit, merging the motor and pump components that would traditionally be separate in radial-flow designs. This merging eliminates the need for additional eccentric disks and separate drive mechanisms, reducing overall height while maintaining drive power.
2Force
If additional eccentric disks are used for torque transfer, then torque transmission is achieved, but device complexity and weight increase
Solution Approach 1:
The rotor disk performs multiple functions simultaneously: it generates the magnetic field through permanent magnets, receives torque from the axial-flow machine, and transmits torque to the drive means through its integrated structure. This merging of functions eliminates the need for separate eccentric disks, reducing component count and complexity while maintaining effective torque transmission.
Solution Approach 2:
The rotor disk is designed as a multi-functional component that serves as both the magnetic field generator and the torque transmission element. By making the rotor universal in its functions, the patent eliminates the need for additional specialized components like eccentric disks, thereby reducing device complexity and weight.
3Length of stationary object
If compact axial-flow machine is used, then overall height and weight are reduced, but manufacturing complexity of stator teeth increases
Solution Approach 1:
The stator is divided into multiple independent stator teeth, each with its own coil winding and magnetic pole. This segmentation allows each tooth to be manufactured and positioned separately, facilitating the complex geometry required for compact axial-flow design while enabling modular assembly and simplifying the manufacturing process for each individual component.
Solution Approach 2:
The patent employs specific geometric parameters for the stator teeth, including rectangular cross-sections and optimized spacing, that balance manufacturing ease with compact design requirements. These parameter optimizations allow the stator teeth to achieve the necessary magnetic and structural properties while remaining manufacturable using standard techniques.
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 achieves a significant reduction in overall height and weight, enhances power density, and reduces energy consumption, making it suitable for compact and efficient use in refrigeration systems and other fluid conveyance applications.
Implementation Method 1
each tooth core is wound with at least one coil winding
Implementation Method 2
at least one first rotor (4), in particular having permanent magnets (22)
Implementation Method 3
at least one compensating mass (23), which is disposed separated from the shaft axis in radial direction and substantially opposite the eccentric cam in radial direction
Data Source
AI summary
A pump arrangement includes an axial-flow machine and a drive to convey fluid mounted in a housing. The axial-flow machine is formed by at least one first rotor having permanent magnets, a shaft connected to the first rotor and a stator arrangement with stator teeth distributed concentrically around the shaft axis circumferentially and axially separated from the first rotor by an air gap. The stator teeth have axially-opposite end portions and a tooth core therebetween wound with at least one coil winding. The second end portion, turned away from the first rotor, of each stator tooth forms a tooth root joined to a back plate. The first rotor is an eccentric disk and on the side away from the stator arrangement has an eccentric cam, radially spaced from the shaft axis, and rotatably and torque-transmittingly connected to the drive. An axial-flow machine and a compressor includes the pump arrangement.