Electromagnetic Suspension Layout for Compact High-Damping Linear Motors
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Solution Overview
Problem
Electromagnetic suspensions with linear motors face challenges in reducing size and interference with other components due to their larger diameter, especially in electric vehicles with limited engine room space, while maintaining high damping performance and small thrust pulsation.
Innovation Solution
The electromagnetic suspension design includes a recess and protrusion on the outer peripheral portion of the cylindrical magnetic body to minimize interference and maintain thrust, featuring a 5-pole 6-slot structure with a three-phase motor configuration and adjustable protrusions to manage magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electromagnetic suspension with a linear motor is used to improve damping performance, then damping performance and responsiveness are improved, but the size and diameter of the suspension increase
Solution Approach 1:
The cylindrical magnetic body is segmented by providing recesses and protrusions on its outer peripheral surface, dividing the magnetic flux path into multiple regions. This segmentation allows the magnetic flux to be distributed more efficiently, generating sufficient thrust with a smaller overall diameter, thereby resolving the contradiction between damping performance and suspension size.
Solution Approach 2:
The recesses and protrusions create local variations in magnetic flux density distribution. By concentrating magnetic flux in specific regions (local quality enhancement), the linear motor generates higher thrust density, enabling compact design while maintaining high damping performance. This local quality approach allows the smaller diameter design to achieve the same thrust as larger conventional designs.
2Volume of moving object
If the diameter of the electromagnetic suspension is reduced to fit in narrow spaces, then space interference is reduced, but thrust pulsation increases
Solution Approach 1:
The recesses and protrusions segment the magnetic flux path into multiple parallel paths. This segmentation smooths the magnetic flux distribution and reduces fluctuations in thrust generation, thereby suppressing thrust pulsation even in the compact small-diameter design. The multiple segmented paths work together to provide stable thrust output.
Solution Approach 2:
The protrusions extend the magnetic flux path continuously along the axial direction, ensuring uninterrupted magnetic flux flow. This continuous magnetic flux path maintains stable electromagnetic force generation, reducing thrust pulsation and vibration while preserving the compact diameter, thus achieving both small size and stable thrust.
3Volume of moving object
If the diameter of the electromagnetic suspension is reduced to fit in narrow spaces, then space interference is reduced, but thrust decreases
Solution Approach 1:
The recesses and protrusions create localized regions of enhanced magnetic flux density. By concentrating and optimizing the magnetic flux in these local regions, the linear motor achieves high thrust density, compensating for the reduced overall diameter and maintaining sufficient total thrust for effective damping performance.
Solution Approach 2:
The segmented magnetic flux path through recesses and protrusions creates multiple parallel magnetic flux channels. This segmentation increases the effective magnetic flux utilization, allowing the compact design to generate sufficient thrust by summing the contributions from multiple segmented flux paths.
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 design allows for a compact electromagnetic suspension that suppresses interference, provides a large thrust, and maintains high damping performance even for high-frequency vibrations, suitable for electric vehicles and other applications.
Implementation Method 1
an electromagnetic suspension including a linear motor that includes an armature and a permanent magnet portion, the armature including a winding and a magnetic body, the permanent magnet portion being disposed on an outer periphery of the armature and including a permanent magnet and a cylindrical magnetic body, and the armature and the permanent magnet portion being relatively linearly driven in the linear motor
Implementation Method 2
a permanent magnet portion being disposed on an outer periphery of the armature and including a permanent magnet and a cylindrical magnetic body
Data Source
AI summary
The present invention provides an electromagnetic suspension capable of suppressing interference with other components and devices, being mounted in a narrow space, and having a small thrust pulsation, a large thrust, and a high damping performance even for a high-frequency vibration source. An electromagnetic suspension of the present invention includes a linear motor that includes an armature and a permanent magnet portion, the armature including a winding and a magnetic body, the permanent magnet portion being disposed on an outer periphery of the armature and including a permanent magnet and a cylindrical magnetic body, and the armature and the permanent magnet portion being relatively linearly driven in the linear motor, in which a recess recessed from an outer peripheral portion of the cylindrical magnetic body and a protrusion protruding from the outer peripheral portion are disposed on the same circumference of the outer peripheral portion of the cylindrical magnetic body.