Electric Machine Stator Mounting for Precise Rotor Alignment
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Solution Overview
Problem
Electric motor designs face challenges in achieving precise alignment between the stator and rotor while balancing the need for a compact, lightweight, and cost-effective structure that can withstand mechanical stresses and external loads, particularly in motor vehicles.
Innovation Solution
The electric machine arrangement incorporates a length compensating element that axially supports the stator, allowing it to adapt to radial and axial displacements, decoupling the stator from rotational movement and providing torque support, which reduces mechanical stress and enables precise alignment, thus enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the mechanical structure is designed to be particularly stiff and robust to ensure precise alignment, then the alignment precision between rotor and stator is improved, but the device complexity, weight and installation space increase
Solution Approach 1:
The patent applies the dynamics principle by making the stator axially movable relative to the component supporting it, allowing the stator to adapt to axial and radial displacements of the rotor. This dynamic adjustment capability replaces the need for an overly stiff mechanical structure, maintaining alignment precision while reducing structural complexity and weight.
Solution Approach 2:
The patent changes the parameter of stator position from fixed to variable by introducing axial movability. The stator can adjust its axial position to compensate for rotor displacements caused by deformations and forces, thereby maintaining precise alignment without requiring a complex stiff structure.
2Manufacturing precision
If additional components are added to ensure precise positioning, then the alignment precision is improved, but the device complexity and cost increase
Solution Approach 1:
The length compensating element serves multiple functions: it compensates for length changes, supports torque, and enables axial movement of the stator. By combining these functions into a single component, the patent achieves precise positioning without adding multiple separate components, thus avoiding increased device complexity.
Solution Approach 2:
The length compensating element acts as an intermediary between the stator and the component supporting the stator. It mediates the interaction by allowing controlled axial movement while maintaining torque support, thereby achieving precise positioning through a single intermediate component rather than multiple complex mechanisms.
3Strength
If the stator is firmly connected to prevent twisting, then the torque support is improved, but the adaptability to rotor displacements decreases
Solution Approach 1:
The patent segments the connection between the stator and the supporting component into two independent functions: torque support (circumferential direction) and axial movement (axial direction). The length compensating element provides firm torque support while the bearing point allows axial displacement, achieving both strong torque support and high adaptability to rotor displacements.
Solution Approach 2:
The patent applies dynamics by creating a semi-rigid connection that is rigid in the circumferential direction (for torque) but flexible in the axial direction (for displacement adaptation). The stator can move axially relative to the supporting component while maintaining torque support, allowing the system to adapt to rotor displacements without sacrificing torque capability.
Data Source
AI summary
An electric machine arrangement includes an electric machine having a stator and a rotor, a component supporting the stator, and an output element that is in contact with the rotor for conjoint rotation therewith. The stator is supported in the rotational direction via a length compensating element and is at least axially movably connected to the component supporting the stator.