Temple Motor Stator with Segmented Legs for Torque
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic rotary drives, such as temple motors, face challenges in achieving a compact design while maintaining adequate torque and magnetic bearing quality, particularly in applications requiring high purity and gentle handling like blood pumps and pharmaceutical processes.
Innovation Solution
The design incorporates a rotor with an annular or disk-shaped magnetically active core and a stator with coil cores having longitudinal and transverse legs, where the longitudinal legs have sections with varying radial distances to allow for a compact stator configuration, increasing the rotor diameter without compromising magnetic flux guidance, thus enhancing torque and axial rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotor diameter is increased to enhance torque, then the torque increases, but the stator size and complexity increase
Solution Approach 1:
The longitudinal legs are designed with varying radial distances in different axial sections, utilizing the axial dimension to resolve the radial space conflict. This allows the stator to accommodate a larger rotor diameter for increased torque while maintaining a compact overall stator volume by distributing the magnetic flux guidance across different axial positions.
Solution Approach 2:
The longitudinal legs are divided into multiple sections along the axial direction, with each section having a different radial distance. This segmentation allows independent optimization of each section's radial position to guide magnetic flux effectively while maintaining compact stator dimensions.
2Volume of stationary object
If the stator is made compact to reduce size, then the volume decreases, but the magnetic flux guidance and torque are compromised
Solution Approach 1:
By utilizing the axial dimension through multi-sectioned longitudinal legs with varying radial distances, the design guides magnetic flux effectively through the compact stator volume without compromising the rotor diameter needed for adequate torque generation.
Solution Approach 2:
Different sections of the longitudinal legs have different radial distances optimized for their specific functions: some sections are positioned to guide magnetic flux from the rotor, while others are positioned to guide flux to the rotor, allowing efficient flux guidance within compact dimensions.
3Ease of manufacture
If the longitudinal legs have uniform radial distance, then the manufacturing is simpler, but the magnetic flux guidance and axial rigidity are reduced
Solution Approach 1:
The longitudinal legs are segmented into multiple sections along the axial direction, with each section having an optimized radial distance for its specific function. This segmentation enables both effective magnetic flux guidance and adequate axial rigidity while remaining manufacturable through standard fabrication processes.
Solution Approach 2:
Each section of the longitudinal legs has a locally optimized radial distance tailored to its specific function in the magnetic flux path, whether guiding flux from the rotor or to the rotor, thereby achieving optimal axial rigidity and flux guidance without excessive manufacturing complexity.
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 results in a more compact and efficient electromagnetic rotary drive with increased torque and improved magnetic bearing stability, suitable for high-purity and gentle handling applications.
Implementation Method 1
at least one concentrated winding is arranged on each longitudinal leg, surrounding the respective longitudinal leg
Implementation Method 2
The stator's electrical windings can be used to generate a magnetic rotating field. This field exerts a torque on the rotor, causing it to rotate
Implementation Method 3
The stator's electrical windings can be used to generate a magnetic rotating field. This field exerts a torque on the rotor, causing it to rotate around a desired axis of rotation, and also exerts an arbitrarily adjustable transverse force on the rotor
Implementation Method 4
exerts an arbitrarily adjustable transverse force on the rotor, allowing its radial position to be actively controlled or regulated
Implementation Method 5
With regard to three additional degrees of freedom, namely its axial position and tilting relative to the radial plane perpendicular to the nominal rotational axis (two degrees of freedom), the rotor is passively magnetic, meaning it cannot be controlled, and is supported or stabilized by reluctance forces
Data Source
Figure 1
Figure 2
Figure 2a
AI summary
An electromagnetic rotary drive is proposed, designed as a temple motor, with a rotor (3) comprising a ring- or disk-shaped magnetically effective core (31), and with a stator (2) designed as a bearing and drive stator, with which the rotor (3) can be driven magnetically without contact about a desired axis of rotation, which defines an axial direction (A), and with which the rotor (3) can be magnetically supported without contact with respect to the stator (2), wherein the rotor (3) is actively magnetically supported in a radial plane (E) perpendicular to the axial direction (A), and is passively magnetically stabilized in the axial direction (A) and against tilting, wherein the stator (2) has a plurality of coil cores (25), each of which comprises a longitudinal leg (26) extending in the axial direction (A), and a transverse leg (27) arranged in the radial plane (E).which extends from the longitudinal leg (26) in a radial direction and is bounded by an end face (211) which faces the magnetically effective core (31) of the rotor (3), and wherein at least one concentrated winding (61) is arranged on each longitudinal leg (26) and surrounds the respective longitudinal leg (26). Each longitudinal leg (26) comprises a first section (261) and a second section (262) which are arranged adjacent to each other with respect to the axial direction (A), wherein the transverse leg (27) is arranged on the second section (262), wherein the end face (211) of the transverse leg (27) has a first distance (A1) in the radial direction from the first section (261) of the associated longitudinal leg (26) and a second distance (A2) in the radial direction from the second section (262).and wherein the second distance (A2) is greater than the first distance (A1). The invention further proposes a centrifugal pump with such a rotary drive (1) and a pump unit.