Stator Core Openings for Radial Force Damping
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Solution Overview
Problem
High torque density in electric machines often results in unacceptable noise and vibration due to cogging torque, torque ripple, and electromagnetic radial forces, which existing mitigation strategies fail to adequately address as demands for higher torque density increase.
Innovation Solution
The introduction of openings in the stator core and machine housing, which act as damping mechanisms to reduce radial forces and deformation, thereby minimizing noise and vibration without compromising torque density, by reducing points of contact and acting as springs to absorb radial forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high torque density is achieved in electric machines, then power output is improved, but noise and vibration increase to unacceptable levels
Solution Approach 1:
The stator core is segmented by introducing openings that divide the continuous magnetic path into separate regions. These openings create discrete magnetic circuits that reduce the propagation of radial forces and vibrations through the stator structure, thereby mitigating noise while preserving torque density.
Solution Approach 2:
The openings in the stator core act as intermediary elements that decouple the transmission of electromagnetic radial forces from the stator housing. By introducing these intermediate structures, the harmful radial forces are isolated and damped before they can propagate to the machine housing, reducing noise and vibration.
2Object-affected harmful factors
If openings are introduced in the stator core to reduce radial forces, then noise and vibration are reduced, but magnetic losses may increase
Solution Approach 1:
The openings are strategically positioned in specific regions of the stator core where they most effectively reduce radial forces and vibrations, rather than uniformly distributing them. This localized approach ensures that magnetic losses are minimized while achieving the desired vibration reduction in critical areas.
Solution Approach 2:
The dimensions, shape, and distribution of the openings are carefully optimized to achieve the right balance between vibration reduction and magnetic performance. By adjusting parameters such as opening size, position, and configuration, the design minimizes magnetic path disruptions while maintaining effective damping of radial forces.
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 solution effectively reduces radiated noise and vibration while maintaining motor torque density by minimizing deformation and magnetic losses, ensuring efficient electromagnetic performance.
Implementation Method 1
acting as springs to absorb radial forces
Implementation Method 2
act as damping mechanisms to reduce radial forces and deformation
Data Source
AI summary
A permanent magnet machine includes a machine housing and a stator disposed within the machine housing. The machine housing has an inner surface that extends between a first housing end and a second housing end along a central longitudinal axis. The stator has a stator core having an exterior surface and an interior surface, each extending between a first face and a second face along the central longitudinal axis. The stator core defines a plurality of openings that extend from the first face towards the second face.