Electric Motor Stator Vibration Damping via T-Shaped Pole Tabs
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Solution Overview
Problem
Electric motors with laminated cores experience resonance at certain speeds, leading to increased noise and component wear due to natural oscillations, which are not effectively addressed by existing technologies.
Innovation Solution
The electric motor design incorporates T-shaped stator teeth with expanded pole brackets and stiffening elements that are frictionally and materially joined to the stator, damping vibrations and shifting the natural frequency out of the resonance range, thereby improving acoustic properties and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a laminated core is used in the stator, then eddy current losses are reduced, but resonance and natural vibrations occur at certain speeds leading to increased noise and component wear
Solution Approach 1:
The patent changes the physical parameters of the stator by adding stiffening elements that modify the structural stiffness and natural frequency of the laminated core. This shifts the resonant frequencies away from the operating speed range, eliminating the harmful vibrations and noise while preserving the energy-efficient laminated core structure
Solution Approach 2:
The patent creates a composite structure by integrating stiffening elements (such as ribs or加强 rings) into the laminated core assembly. This composite construction combines the electrical advantages of laminated cores with the mechanical advantages of enhanced stiffness, resolving the contradiction between energy efficiency and vibration resistance
2Object-affected harmful factors
If stiffening elements are added to the stator, then vibrations are damped and natural frequency is shifted, but device complexity increases
Solution Approach 1:
The patent merges the stiffening elements with the existing stator components, such as integrating ribs into the stator yoke or combining support structures with the laminated core assembly. This integration approach adds vibration-damping functionality without significantly increasing overall device complexity or requiring separate independent components
Solution Approach 2:
The patent applies stiffening elements selectively at specific locations within the stator where they are most effective in damping vibrations and shifting natural frequencies. This localized approach ensures optimal vibration control while minimizing the addition of structural complexity compared to a complete redesign of the entire stator
3Stability of the object's composition
If bridge elements or insulating sections are inserted between stator teeth, then magnetic pole separation is improved, but manufacturing complexity and production costs increase
Solution Approach 1:
The patent designs the stiffening elements to serve multiple functions simultaneously: they provide structural stiffness to dampen vibrations, maintain proper spacing between magnetic poles, and offer mechanical support for windings. This multi-functionality eliminates the need for separate bridge elements or insulating sections, simplifying manufacturing while achieving the same magnetic pole separation effect
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 dampens stator vibrations, reducing noise and wear, and enhances the acoustic performance of the electric motor, while maintaining cost-effectiveness in production and avoiding changes to the laminated core manufacturing process.
Implementation Method 1
The stiffening elements are frictionally and materially joined to the stator, damping vibrations and shifting the natural frequency out of the resonance range
Implementation Method 2
The stiffening elements are frictionally and materially joined to the stator
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to an electric motor (2) comprising a rotor (4) rotatably mounted about an axially extending axis (A) and a stator (6) with stator teeth (20), the stator teeth (20) being T-shaped at the root end forming circumferentially extending (U) pole tabs (21), each forming a bearing shoulder (43), a stator groove (24) for receiving coils (25) of a stator winding being formed between adjacent stator teeth (20) and a slot (30) being formed between opposing pole tabs (21), a number of stiffening elements (42) being provided which are inserted into a corresponding number of slots (30), the stiffening elements (42) being radially extended at the opposing pole tabs (21) of adjacent stator teeth (20). (R) are held by means of the attachment shoulders (43),wherein the pole tabs (21) have a groove (44) open in the circumferential direction (U) and extending in the axial direction (A) at their free ends, wherein the respective contact shoulder (43) for the stiffening element (42) is formed by one of the groove walls (46) of the groove (44), wherein the stator (6), in particular its laminated core (22), has a plastic overmolding (23) by means of which the stator yoke-side groove wall (46) of the groove (44) is formed, and wherein the rotor-side groove wall (46) is formed by means of the laminated core (22).