Rotor Lamination Tooth Welding for Stable Press-Fit Assembly
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Solution Overview
Problem
The mounting of separately excited rotor bodies on rotor shafts in rotary electric machines can lead to premature breakage or reduced balancing quality due to relative movements of laminations during press-fitting.
Innovation Solution
The rotor design incorporates at least one weld seam on the lateral face of each tooth, which enhances the mechanical support between laminations, stabilizing the lamination package and mitigating mechanical stress during press-fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rotor body is mounted on the rotor shaft by press-fitting, then the rotor body can be securely attached to the rotor shaft, but relative movements of the laminations occur leading to premature breakage or reduced balancing quality
Solution Approach 1:
Weld seams are created on the lateral faces of teeth before the press-fitting operation. These weld seams pre-reinforce the lamination structure, preventing relative movements during the subsequent press-fitting process and eliminating the need to compromise between attachment strength and reliability
2Strength
If the rotor body is mounted on the rotor shaft by press-fitting, then the rotor body can be securely attached to the rotor shaft, but undesired relative movements of laminations occur during mounting
Solution Approach 1:
Weld seams are created on the lateral faces of teeth before the press-fitting operation. These weld seams pre-reinforce the lamination structure, preventing relative movements during the subsequent press-fitting process
3Ease of manufacture
If conventional mounting methods are used, then the manufacturing process is simple, but the in-service life of the rotor is reduced due to premature breakage
Solution Approach 1:
Weld seams are created on the lateral faces of teeth before assembly. This preliminary reinforcement step prevents premature breakage during operation, extending rotor service life while maintaining manufacturing simplicity through the integration of welding into the existing assembly process
Solution Approach 2:
The mechanical properties of the lamination structure are changed by introducing weld seams, which modify the strength and stability parameters of the tooth structure. This enables the lamination package to withstand press-fitting forces and operational stresses without premature failure
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 weld seams effectively limit undesired relative movements of laminations, improving the manufacturing process and in-service life of the rotor by enhancing mechanical stability and balancing quality.
Implementation Method 1
at least one tooth of the plurality of teeth comprises at least one weld seam on a lateral face of the corresponding tooth
Data Source
AI summary
A rotor for a rotary electric machine includes a rotor shaft configured to rotate around an axis of rotation, a rotor body formed of a stack of laminations having a plurality of teeth projecting radially and being configured to be mounted coaxially on the rotor shaft. A field coil is wound around each tooth of the plurality of teeth. At least one tooth of the plurality of teeth includes at least one weld seam on a lateral face of the corresponding tooth, the lateral face extending radially and axially along the axis of rotation.