Wound-Rotor Synchronous Machine With Bilateral Cooling Channels
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Solution Overview
Problem
Existing synchronous electrical machines, particularly those with wounded rotors, face challenges such as high thermal losses, complex assembly due to permanent magnets, limited torque density, and inefficient cooling, which are exacerbated by the limited space available in boats.
Innovation Solution
A synchronous electrical machine design featuring a wounded rotor with magnetic stator and rotor pole cores fixed using removable fastening means, non-magnetic shims to reduce Eddy-currents, and a bilateral cooling system with radial cooling ducts and channels to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If permanent magnet rotors are used in synchronous machines, then torque density is improved, but assembly complexity increases and non-magnetic tools are required
Solution Approach 1:
The patent extracts the permanent magnets from the rotor design, replacing them with a wounded rotor configuration. This eliminates the need for complex assembly procedures and non-magnetic tools while maintaining the synchronous machine's operational principles through electromagnetic induction between stator and rotor windings
Solution Approach 2:
The wounded rotor uses conventional wound windings instead of expensive permanent magnets, allowing for easier manufacturing, assembly, and potential replacement. The rotor winding can be easily rewound or replaced without requiring specialized non-magnetic tools, reducing both initial cost and maintenance complexity
2Temperature
If axial cooling is implemented in synchronous machines, then stator cooling is achieved, but hotspots occur and torque density is limited
Solution Approach 1:
The patent transitions from unidirectional axial cooling to bidirectional cooling by introducing radial cooling ducts that extend from the stator bore through the magnetic stator yoke to the outer stator frame. This three-dimensional cooling network allows cooling fluid to flow through multiple paths (axial and radial), efficiently removing heat from deep within the stator structure and preventing hotspots, thereby enabling higher torque density
3Ease of manufacture
If wounded rotor synchronous machines are used, then manufacturing and assembly are simplified, but thermal losses increase
Solution Approach 1:
The patent applies local quality by implementing targeted cooling measures specifically at the rotor winding locations. The rotor is equipped with cooling ducts and channels that direct cooling fluid precisely where thermal losses occur in the wounded rotor, efficiently removing heat from the rotor windings and reducing thermal losses without compromising the manufacturing simplicity of the wounded rotor design
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
The design improves torque density, reduces assembly complexity, and enhances cooling efficiency, resulting in improved performance and reliability without the need for non-magnetic tools.
Implementation Method 1
a non-magnetic shim can be interposed between each magnetic stator poles and the stator frame. The non-magnetic shim avoids Eddy-induced losses in the frame.
Implementation Method 2
each magnetic stator pole core extending in a longitudinal direction of the stator comprises at least one cooling groove on a surface of the said magnetic stator pole core in contact with the stator frame and extending along the longitudinal direction so that the groove and the contact surface of the stator frame form a cooling channel
Implementation Method 3
A synchronous electrical machine design featuring a wounded rotor with magnetic stator and rotor pole cores
Data Source
AI summary
Provided is a synchronous electrical machine that includes a stator and a wounded rotor, the stator having a plurality of phases, each phase comprising coils connected together and magnetic stator poles cores fixed on a stator frame and evenly distributed along a stator diameter, each coil being wounded around a different magnetic stator pole core to form a magnetic stator pole, each phase comprising a same number of magnetic stator poles, the magnetic stator poles of each phase being disposed in the stator frame to form a concentric winding stator. The rotor includes a plurality of magnetic rotor pole cores evenly distributed around the rotor and rotor coils, each rotor coil being wounded around a different magnetic rotor pole core to form a magnetic rotor pole.