Consequent Pole Motor Cover Structure for Stator Stiffness
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Solution Overview
Problem
Consequent pole type motors tend to have larger outer diameters, leading to insufficient stator stiffness, increased vibration, and noise due to the larger outer diameter of the stator.
Innovation Solution
The motor design includes an annular stator core with core segments connected via thin-wall connecting portions, a cover portion surrounding the stator core, and a rotor with magnets forming magnetic poles, where the minimum distance from the axis to the outer circumference of the cover portion is at least 1.15 times the minimum distance to the stator core's outer circumference, enhancing the cover's ability to hold the stator core firmly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a consequent pole type rotor is used to increase motor output, then the motor output is improved, but the stator outer diameter becomes large leading to insufficient stator stiffness
Solution Approach 1:
The stator core is divided into multiple core segments that are connected via connecting portions. This segmentation allows the stator core to maintain structural integrity while reducing the overall outer diameter, thereby improving stiffness without compromising the motor output capability provided by the consequent pole type rotor.
Solution Approach 2:
The core segments are nested together with connecting portions that interlock them, creating a compact structure. This nesting approach enables the stator to achieve sufficient stiffness with a reduced outer diameter, resolving the contradiction between maintaining motor output and improving stator stiffness.
2Power
If the stator outer diameter is increased to accommodate higher output, then the motor output is improved, but vibration and noise increase due to insufficient stator stiffness
Solution Approach 1:
By segmenting the stator core into multiple parts connected by connecting portions, the structure achieves sufficient stiffness to suppress vibration and noise while maintaining a compact outer diameter that supports high motor output without generating excessive harmful factors.
Solution Approach 2:
The invention changes the structural parameters of the stator by introducing connecting portions between core segments, which modifies the stiffness characteristics and reduces vibration and noise while preserving the high output capability.
3Power
If the stator outer diameter is increased, then the motor output is improved, but the structural integrity and stiffness of the stator decrease
Solution Approach 1:
The stator core is segmented into multiple core segments connected by connecting portions, which maintains structural integrity through the interlocking design while enabling a compact configuration that supports high motor output without compromising stability.
Solution Approach 2:
The stator structure combines core segments with connecting portions to create a composite configuration that enhances structural integrity while maintaining a reduced outer diameter, thereby preserving stability alongside high output performance.
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 effectively reduces vibration and noise by suppressing deformation of the stator core and enhancing the motor's structural integrity while minimizing material usage.
Implementation Method 1
a magnet forming a first magnetic pole, and a part of the rotor core forming a second magnetic pole
Data Source
AI summary
A motor includes an annular stator core having a plurality of core segments connected via connecting portions in a circumferential direction about an axis, a cover portion covering the stator core and having a core-surrounding portion surrounding the stator core from an outer side in a radial direction about the axis, and a rotor having a rotor core provided on an inner side of the stator core in the radial direction and a magnet attached to the rotor core. The magnet forms a first magnetic pole, and a part of the rotor core forms a second magnetic pole. A minimum distance R1 in the radial direction from the axis to an outer circumference of the core-surrounding portion and a minimum distance R2 in the radial direction from the axis to an outer circumference of the stator core satisfy R1≥1.15×R2.