Embedded Magnet Rotor Layout for Lower Electromagnetic Vibration
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Solution Overview
Problem
Existing permanent magnet embedded-type rotating electrical machines experience vibration and noise due to electromagnetic forces, with conventional methods to mitigate these issues leading to increased wind noise, windage loss, or reduced output torque.
Innovation Solution
A rotor design incorporating first and second magnetic resistance portions on the outer circumferential surface of the rotor core, with specific dimensions and configurations to reduce electromagnetic vibration forces without increasing wind noise or windage loss, and minimize torque reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a groove is formed on the outer circumference of the rotor core to suppress electromagnetic vibration force, then electromagnetic vibration force is reduced, but wind noise and windage loss increase
Solution Approach 1:
The invention introduces magnetic resistance portions at specific locations on the outer circumference of the rotor core, creating localized magnetic resistance properties rather than using a continuous groove structure. This localized approach suppresses electromagnetic vibration force while minimizing the impact on wind noise and windage loss by limiting the affected area to specific angular positions rather than the entire circumference.
Solution Approach 2:
The magnetic resistance portions are positioned asymmetrically with respect to the magnetic pole center axes, with specific angular relationships defined between them. This asymmetric arrangement creates targeted magnetic resistance effects that suppress vibration forces while maintaining optimal aerodynamic characteristics for reducing windage loss compared to symmetric or continuous groove structures.
2Force
If a hole is formed on the outer circumference of the rotor core to suppress electromagnetic vibration force, then electromagnetic vibration force is reduced, but output torque decreases
Solution Approach 1:
The invention uses localized magnetic resistance portions with specific angular positions and dimensions rather than large holes. This localized approach provides sufficient magnetic resistance to suppress electromagnetic vibration force while maintaining the structural integrity and magnetic flux paths needed for high output torque, avoiding the torque reduction associated with large hole formations.
Solution Approach 2:
The invention optimizes parameters such as the angular position, radius, and width of the magnetic resistance portions to achieve the desired vibration suppression effect. By carefully controlling these parameters, the magnetic resistance is sufficient to reduce electromagnetic vibration force while minimizing the impact on output torque through optimal parameter selection.
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
The proposed rotor design effectively reduces electromagnetic vibration forces by up to 25.8% while maintaining or enhancing torque, outperforming conventional methods that either worsen torque or increase noise and loss.
Implementation Method 1
at least one first magnetic resistance portion that is formed on a side of an outer circumferential surface on a magnetic pole center axis of the rotor core; and at least a pair of second magnetic resistance portions that is formed on the side of the outer circumferential surface such that the second magnetic resistance portions sandwich the magnetic pole center axis
Data Source
AI summary
A rotor of an embodiment includes: a rotor core in which permanent magnets are embedded; at least one first magnetic resistance portion that is formed on a side of an outer circumferential surface on a magnetic pole center axis of the rotor core; and at least a pair of second magnetic resistance portions that is formed on the side of the outer circumferential surface such that the second magnetic resistance portions sandwich the magnetic pole center axis.