Peripheral-Drive Fan Rotor Layout to Maintain Magnet Alignment
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Solution Overview
Problem
In motor-integrated fluid machines, the rotation of blades causes a displacement that offsets the magnetic poles relative to the windings, widening the gap between them and leading to a deterioration in motor performance and thrust.
Innovation Solution
A motor-integrated fluid machine design where the rotating portion includes blades with a center of gravity on the suction side, opposing the thrust, and magnets are positioned to face each other in the axial or radial direction, minimizing the displacement of the rotor and stator magnets and maintaining the thrust performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If blades are supported on a shaft portion with the tip side as a free end, then the blade structure is simplified and easier to manufacture, but the thrust causes displacement of the blade tip which offsets magnetic poles relative to windings and deteriorates motor performance
Solution Approach 1:
A counterweight is provided on the rotating support ring to generate a centrifugal force that opposes the thrust force acting on the blade. This counterbalancing mechanism prevents the displacement of the blade tip and maintains the proper alignment between magnetic poles and windings, thereby resolving the contradiction between simplified blade support structure and motor performance reliability
2Adaptability or versatility
If the gap between magnetic pole and winding is widened due to positional offset, then the motor structure becomes less constrained, but the motor performance deteriorates and thrust decreases
Solution Approach 1:
The counterweight is positioned to generate a centrifugal force in advance that counteracts the thrust-induced displacement before it can cause significant offset between magnetic poles and windings. This preliminary counterbalancing action maintains optimal motor performance by preventing the harmful positional changes rather than correcting them after they occur
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 configuration suppresses the deterioration in motor performance by maintaining the alignment of magnetic poles and reducing the displacement of the rotor and stator magnets, ensuring stable thrust generation.
Implementation Method 1
The motor includes a rotor side magnet provided in the rotating support ring, and a stator side magnet provided in the outer peripheral portion to face the rotor side magnet
Implementation Method 2
when blades rotate to generate thrust, the generated thrust acts on the blades
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
This motor-integrated fan has a suction port and a blowing port, and is provided with: a rotating part rotatably supported on a shaft part; and a motor that rotates the rotating part. The motor is a peripheral drive motor that rotates the rotating part by applying motive power from a duct provided on an outer peripheral side of the shaft part. The motor includes: a permanent magnet provided on a rotation support ring connected to the outer peripheral side of a blade of the rotating part; and a coil provided facing the permanent magnet in the axial direction of a rotational axis. In a cross-section taken on a plane orthogonal to the circumferential direction of a rotational axis I, the center of gravity (point P2) of a free end side portion including at least one of the rotation support ring and the permanent magnet is positioned more to the suction port side in the axial direction of the rotational axis I than the center of gravity (point P1) of the thrust applied to the plurality of blades.