Double-Stator Retainer Minimizes Stator Misalignment
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Solution Overview
Problem
Double-stator electric rotating machines face misalignment issues between inner and outer stators, leading to magnetic vibration, torque ripple, and potential physical contact, which reduces output torque and increases mechanical vibration.
Innovation Solution
The implementation of a retainer with a connector that joints the outer and inner stators together, securely holding their peripheries and preventing misalignment in axial, radial, and circumferential directions, using multi-phase windings and locking mechanisms to maintain proper positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the retainer plate is supported only by the axial ends of the inner and outer stator cores, then the structure is simple, but misalignment between stator cores occurs leading to magnetic vibration and torque ripple
Solution Approach 1:
The retainer structure transitions from one-dimensional (axial ends only) to three-dimensional contact by adding contact with outer and inner peripheral surfaces, providing comprehensive support and preventing misalignment in radial, axial, and circumferential directions
Solution Approach 2:
The retainer acts as an intermediary component between the inner and outer stators, providing mechanical support and maintaining precise alignment through multi-surface contact, thereby preventing magnetic vibration and torque ripple
2Manufacturing precision
If the retainer plate is used to join stators, then alignment is improved, but the retainer plate is easy to flex or deform causing stator shift
Solution Approach 1:
The retainer gains structural strength by extending contact from one-dimensional (axial ends) to three-dimensional (including outer and inner peripheral surfaces), distributing loads across multiple surfaces to prevent flexing and deformation
Solution Approach 2:
The retainer is designed with preliminary rigid support structures including locking portions and corner support features that prevent stator displacement before misalignment can occur, maintaining structural integrity under operational loads
3Ease of manufacture
If axial alignment between rotor and stators is poor, then assembly is easier, but effective region for magnetic flux flow decreases reducing output torque
Solution Approach 1:
The retainer is pre-configured with contact surfaces and support features that automatically maintain precise axial alignment between rotor and stators during assembly, ensuring optimal magnetic flux flow region without requiring complex alignment procedures
Solution Approach 2:
The mechanical alignment function is integrated into the retainer structure itself through precisely positioned contact surfaces, replacing the need for separate alignment mechanisms or procedures while maximizing output torque
4Ease of manufacture
If the retainer contacts only axial ends, then manufacturing is simpler, but circumferential misalignment occurs between stators
Solution Approach 1:
The retainer structure adds circumferential alignment capability by contacting outer and inner peripheral surfaces in addition to axial ends, transitioning from one-dimensional to three-dimensional support to prevent misalignment in all directions
Solution Approach 2:
The retainer serves as a multi-functional intermediary that simultaneously provides axial support, radial support, and circumferential alignment through its contact with multiple surfaces of the inner and outer stators
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
This solution effectively minimizes misalignment, reduces magnetic vibration, and enhances the stability of the stators, preventing physical contact and maintaining effective magnetic flux flow, thereby improving output torque and reducing mechanical vibrations.
Implementation Method 1
The retainer is placed in contact with at least one of at least a portion of an outer peripheral surface of the outer stator and at least a portion of an inner peripheral surface of the inner stator to retain the outer and inner stators together
Implementation Method 2
The retainer has a locking portion which engages the locked portion. This holds the outer and inner stator from being shifted in the circumferential direction, the axial direction, or the radial direction thereof
Implementation Method 3
an outer stator which is equipped with an outer multi-phase winding; an inner stator which is equipped with an inner multi-phase winding
Data Source
AI summary
A double-stator electric rotating machine with a retainer. The retainer includes a connector which joints between an outer stator and an inner stator. The retainer is placed in contact with an outer peripheral surface of the outer stator and an inner peripheral surface of the inner stator to retain the outer and inner stators together. Specifically, the retainer works to join the outer stator and the inner stator together and also to tightly hold the outer periphery of the outer stator and the inner periphery of the inner stator, thus minimizing misalignment of the outer and inner stators in axial and radial directions there of.