Electric POD Marine Drive Stator Housing for Higher Torque
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Solution Overview
Problem
Existing electric POD marine drive units face limitations in optimizing torque output due to restricted stator and rotor diameters, which affects propulsion efficiency and hydrodynamic properties.
Innovation Solution
The design features a larger stator diameter without increasing the overall size, utilizing the stator as an outer housing for improved heat dissipation and incorporating soft magnetic composite materials to enhance magnetic interaction and reduce weight, while maintaining optimal efficiency and hydrodynamic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the stator diameter is increased to improve torque output, then the propulsion power is enhanced, but the overall size of the drive unit increases
Solution Approach 1:
The stator is designed to serve dual functions: as the electromagnetic component generating the magnetic field and as the outer housing of the drive unit. This multi-functionality allows the stator diameter to be optimized for torque output without requiring additional housing space, effectively resolving the contradiction between increased propulsion power and drive unit size.
Solution Approach 2:
The patent merges the stator and the outer housing into a single integrated component. By combining these two previously separate elements, the design eliminates the need for additional space for a separate housing, allowing the stator diameter to be increased for higher torque while maintaining the same overall drive unit dimensions.
2Force
If the stator diameter is increased to improve torque output, then the magnetic interaction is enhanced, but the hydrodynamic properties deteriorate due to increased drag
Solution Approach 1:
The stator serves as both the electromagnetic structure and the hydrodynamic outer housing. This allows the stator's outer surface to be optimized for hydrodynamic flow while its internal dimensions provide sufficient diameter for enhanced magnetic interaction and torque output, simultaneously addressing both contradictory requirements.
Solution Approach 2:
The stator design allows different regions to serve different functions: the outer surface is optimized for hydrodynamic properties with smooth contours reducing drag, while the internal structure provides sufficient diameter and space for enhanced magnetic field interaction and higher torque generation.
3Strength
If conventional materials are used in the stator, then the structural integrity is maintained, but the weight increases and torque output is limited
Solution Approach 1:
The stator is constructed using composite materials that combine high strength-to-weight ratio properties. These composite structures maintain the necessary structural integrity for withstanding operational stresses while significantly reducing the overall weight compared to conventional solid materials, enabling increased stator diameter without proportional weight increase.
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 enhances torque output, improves magnetic interaction, reduces drag, and maintains efficiency by leveraging the stator's outer housing for direct cooling and structural integrity, resulting in improved propulsion and maneuverability.
Implementation Method 1
the inner face of the stator comprises a plurality of stator coils
Implementation Method 2
the inner face is made of a soft magnetic composite
Implementation Method 3
the outer face of the stator is facing the water when the drive unit is submerged
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present disclosure relates to an electric POD marine drive unit, comprising an electric machine being submersible, the electric machine has a rotor and a stator, the rotor is rotatable within the stator, the stator has an inner face arranged opposite the rotor and an outer face, wherein the outer face of the stator functions as an outer housing of a part of the drive unit.