Clamped Rotor End Disk Structure for Magnet Retention and Cooling
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Solution Overview
Problem
The existing rotor designs for rotary electric machines suffer from performance losses due to axial movement of magnets and offset between the rotor body and stator, which are not adequately clamped, leading to reduced efficiency in cooling and overall performance.
Innovation Solution
Incorporating clamping means that press the end disks against the rotor body, combined with blades for fluid movement and rigidification, to securely hold the magnets in place and prevent axial movement, thereby improving positional stability and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If clamping means are added to press end disks against the rotor body, then positional stability of the rotor with respect to the stator is improved, but device complexity increases
Solution Approach 1:
The rotor is divided into separable components (end disks, rotor body, clamping means) that can be independently manufactured and assembled. The clamping means are implemented as discrete fastening elements rather than an integrated complex structure, reducing overall device complexity while achieving the clamping function.
Solution Approach 2:
The end disks are pre-equipped with clamping means during assembly, so that when the rotor is assembled onto the stator, the clamping action is already in place. This preliminary preparation eliminates the need for complex adjustment mechanisms during final assembly, reducing device complexity while ensuring positional stability.
2Reliability
If clamping means are added to press end disks against the rotor body, then magnets are held securely in the cavities, but device complexity increases
Solution Approach 1:
The clamping function is merged with the existing end disk structure. The end disks serve dual purposes: they provide the cooling fluid passage interface and simultaneously serve as the clamping surface when pressed against the rotor body by the clamping means. This integration reduces the need for separate magnet retention mechanisms.
Solution Approach 2:
The clamping means are designed to automatically secure the magnets in place through the axial pressing action on the end disks. The structure itself provides the retention function without requiring additional active control systems or complex adjustment mechanisms, achieving reliable magnet retention through passive mechanical design.
3Temperature
If end disks with blades are used for fluid movement and rigidification, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The end disks are designed with multiple functions integrated into a single component: they provide structural support for the rotor, serve as the interface for cooling fluid passage, and include blades that perform both fluid movement for cooling and structural rigidification. This multi-functionality eliminates the need for separate cooling components, reducing device complexity while improving cooling efficiency.
Solution Approach 2:
The cooling function is merged with the structural end disk design. The blades are integrated directly into the end disk structure, combining the structural rigidification function with the fluid movement function. This integration eliminates separate cooling components and simplifies the overall device design while achieving effective cooling.
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 enhances the positional stability of the rotor with respect to the stator, reduces noise, and maintains effective cooling performance, leading to improved efficiency and reduced performance losses in rotary electric machines.
Implementation Method 1
a first end disk comprising a first number of first blades that are able to move a fluid, notably air, from a first radially inner position to a second radially outer position
Data Source
AI summary
A rotor for a rotary electric machine having an axis of rotation includes a body having cavities includes a first end and a second end that are opposite to each other in the direction of the axis of rotation, and magnets received in the cavities. Also provided is a shaft on which the body is mounted, and a first end disk including a first number of first blades that are able to move a fluid, notably air, from a first radially inner position to a second radially outer position. The first end disk prevents the magnets from exiting the cavities via the first end of the body, and a clamping means presses the first end disk directly or indirectly against the first end of the body.