Motor-Integrated Fluid Machine Ring Structure for Centrifugal Loads
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Solution Overview
Problem
Motor integrated type fluid machines, such as ring motors, face challenges in securing load capacity against centrifugal forces while minimizing weight due to the arrangement of magnetic poles on the rotor support ring, which increases blade thickness and overall weight.
Innovation Solution
A motor integrated type fluid machine design featuring a rotating portion with a hub and blades, where the rotating outer peripheral portion has a higher rigidity ratio compared to the rotating portion, allowing for efficient distribution of centrifugal forces and optimized blade and ring thickness to maintain load capacity without excessive weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnetic poles are arranged on the rotor support ring to enable motor rotation, then the motor can rotate the blades, but the centrifugal force on each blade increases due to the mass of the magnetic poles, requiring increased blade thickness and leading to weight increase
Solution Approach 1:
The rotor support ring is segmented into multiple sections with magnetic poles arranged only in specific regions rather than uniformly around the entire circumference. This segmentation allows the motor to generate sufficient rotation torque while reducing the total mass of magnetic poles, thereby decreasing the centrifugal force burden on blades and allowing for thinner, lighter blade design.
Solution Approach 2:
Magnetic poles are concentrated in specific local regions of the rotor support ring rather than being uniformly distributed. This local concentration strategy provides adequate motor torque for blade rotation while minimizing the overall mass of magnetic poles, thus reducing centrifugal forces and enabling weight reduction in the blade structure.
2Strength
If blade thickness is increased to secure load capacity against centrifugal force, then the load capacity is improved, but the weight of the motor integrated type fluid machine increases
Solution Approach 1:
By segmenting the magnetic pole arrangement and optimizing the rotor support ring structure, the centrifugal force distribution is improved, allowing blades to be designed with reduced thickness while maintaining adequate load capacity. The segmented approach creates a more favorable force distribution that reduces the structural weight penalty.
3Strength
If the rigidity of the rotating outer peripheral portion is increased to withstand centrifugal force, then the load capacity is improved, but the weight of the rotating portion increases
Solution Approach 1:
The rotating outer peripheral portion is designed with locally reinforced structures at critical stress points rather than uniformly increasing thickness throughout. This localized reinforcement provides adequate rigidity to withstand centrifugal forces while minimizing the overall weight increase of the rotating portion.
Solution Approach 2:
Composite materials are employed in the rotating outer peripheral portion to achieve high rigidity-to-weight ratio. The use of composite structures allows the component to withstand centrifugal forces effectively while maintaining lower weight compared to traditional homogeneous materials.
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 design effectively secures load capacity against centrifugal forces while minimizing the weight of the motor integrated type fluid machine, enhancing its durability and reducing the overall weight of the aircraft or vehicle it is integrated into.
Implementation Method 1
The motor includes a rotor side magnet that is provided in the rotating outer peripheral portion, and a stator side magnet that is provided in the outer peripheral portion to face the rotor side magnet
Implementation Method 2
a centrifugal force acts on the rotor support ring when blades are rotated
Data Source
AI summary
A motor integrated type fluid machine suctions a fluid from a suction port and discharges the suctioned fluid from a discharge outlet. The machine includes: a shaft portion provided at a center of a rotation axis; a rotating portion rotating around the shaft portion; an outer peripheral portion provided on an outer periphery of the shaft portion; and an outer peripheral drive motor rotating the rotating portion. The rotating portion includes a hub rotatably supported by the shaft portion, blades provided on an outer peripheral side of the hub and provided side by side in a circumferential direction of the rotation axis, and a rotating outer peripheral portion having an annular shape along the circumferential direction. A ratio of a rigidity of the rotating outer peripheral portion against a centrifugal force to a rigidity of the rotating portion against the centrifugal force is 50% to 95%.