Magnetically Levitated Rotary Drive for Compact High-Torque Pumps
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Solution Overview
Problem
Existing electromagnetic rotary drives, such as temple motors, face challenges in achieving a compact design while maintaining torque and magnetic levitation quality, particularly in applications requiring high purity and gentle handling like pharmaceutical and biotechnological processes, where the rotor's diameter and height ratio affects magnetic flux guidance and stabilization.
Innovation Solution
The design incorporates a ring-shaped or disk-shaped magnetically effective core with a stator featuring coil cores with longitudinal and transverse limbs, where the transverse limbs are arranged to allow a larger rotor diameter without direct magnetic flux transfer, enhancing torque and axial stiffness while maintaining tilting stability through optimized geometric configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotor diameter is increased to improve torque, then the device size increases, but compactness is compromised
Solution Approach 1:
The patent transitions from a conventional planar coil arrangement to a three-dimensional arrangement where coils are positioned at different axial levels (first axial level for drive coils, second axial level for control coils). This dimensional change allows the magnetic flux paths to be optimized independently, enabling increased rotor diameter for higher torque while maintaining overall device compactness through vertical stacking of functional elements.
Solution Approach 2:
The stator is segmented into multiple independent coil sets positioned at different axial levels. The drive coils and control coils are spatially separated and can be independently controlled, allowing optimized magnetic flux distribution that supports larger rotor diameter without proportionally increasing the overall device volume.
2Power
If the rotor diameter is increased to improve torque, then direct magnetic flux transfer between stator and rotor occurs, but magnetic levitation stability deteriorates
Solution Approach 1:
Different regions of the stator are given different functional qualities: drive coils at the first axial level are optimized for torque generation with specific winding configurations, while control coils at the second axial level are optimized for magnetic levitation and stabilization. This local differentiation of functional qualities allows the rotor diameter to be increased for higher torque without compromising levitation stability, as each region independently optimizes its specific function.
Solution Approach 2:
The patent uses axial separation to create independent magnetic flux paths. Drive coils and control coils operate at different axial levels, creating distinct three-dimensional magnetic flux distributions that prevent direct unwanted coupling between torque generation and levitation stabilization functions, even with increased rotor diameter.
3Strength
If the rotor height is increased to improve axial stiffness, then the device becomes taller, but compactness is compromised
Solution Approach 1:
The patent addresses axial stiffness not by increasing rotor height in the radial direction, but by utilizing the axial dimension through multi-level coil positioning. The control coils at the second axial level generate magnetic forces that actively stabilize the rotor axially, achieving high axial stiffness without increasing the overall device height, as the stabilization function is distributed across the axial dimension rather than requiring a taller rotor.
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 enables a more compact and efficient electromagnetic rotary drive with increased torque and improved magnetic levitation stability, suitable for high-purity applications like centrifugal pumps in the pharmaceutical and biotechnological industries.
Implementation Method 1
A magnetic rotating field can be generated with the electrical windings of the stator, which on the one hand exerts a torque on the rotor, which effects its rotation about a desired axis of rotation
Implementation Method 2
which on the other hand, exerts a shear force, which can be set as desired, onto the rotor so that its radial position can be actively controlled or regulated
Implementation Method 3
the rotor is passively magnetically levitated or stabilized by reluctance forces, i.e. it cannot be controlled
Data Source
AI summary
An electromagnetic rotary drive includes a rotor and a stator. The rotor magnetically driven without contact about an axial direction, and magnetically levitated without contact with respect to the stator. The rotor actively magnetically levitated in a radial plane and passively magnetically stabilized in the axial direction against tilting. The stator has coil cores, each including a longitudinal limb extending in the axial direction and a transverse limb arranged in the radial plane. The transverse limb extends from the longitudinal limb and is bounded by an end face. A concentrated winding is arranged on each of the longitudinal limbs surrounding a respective longitudinal limb. The end faces have a first distance in the radial direction from a first portion and a second distance in the radial direction from a second portion, the second distance greater than the first distance.