Salient Pole Rotor Magnetic Compensation for Leakage Flux
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Solution Overview
Problem
Existing synchronous electrical machines with salient poles face challenges in reducing magnetic leakage flux, which affects efficiency and size constraints, particularly in applications like maritime and wind power where increasing space or reducing Ampere-turns is not viable.
Innovation Solution
A rotor design with a magnetic compensation source, such as permanent magnets or complementary field windings, is introduced to generate a complementary magnetic flux that compensates for leakage flux, optimizing power output without increasing the rotor's size by minimizing magnetic saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the space between two poles is increased to reduce magnetic leakage flux, then the magnetic leakage is reduced, but the volume and weight of the rotating electrical machine are increased
Solution Approach 1:
A magnetic compensation source is introduced as an intermediary element positioned in the interpole space. This compensation source generates a complementary magnetic flux that actively counteracts the leakage flux between poles, thereby reducing magnetic leakage without requiring increased spacing between poles, thus maintaining compact machine dimensions
Solution Approach 2:
The rotor structure employs composite magnetic circuit design combining main pole bodies with compensation elements (such as permanent magnets or additional windings) in the interpole regions. This composite configuration enables simultaneous achievement of reduced magnetic leakage and maintained compact geometry through synergistic magnetic flux interaction
2Loss of energy
If the Ampere-turns are reduced to decrease magnetic leakage, then the magnetic leakage is reduced, but the machine is downgraded and costs significantly increase
Solution Approach 1:
The magnetic compensation source acts as an intermediary that reduces leakage flux without requiring reduction of main excitation Ampere-turns. By introducing this compensating magnetic field in the interpole space, the system achieves reduced magnetic leakage while preserving the original power output capability
Solution Approach 2:
The invention converts the harmful leakage flux phenomenon into a beneficial configuration by introducing compensation sources that generate complementary flux. This transforms the problematic magnetic leakage into a controlled magnetic interaction that actually improves overall machine performance while reducing energy loss
3Power
If the main magnetic flux is increased to optimize power, then the power is optimized, but magnetic saturation occurs at the base of the polar bodies
Solution Approach 1:
The invention extracts or removes the problematic magnetic saturation effect by introducing compensation sources in the interpole space. These compensation sources create a magnetic balance that prevents excessive flux concentration at the pole bases, thereby enabling higher power output without reaching saturation limits
Solution Approach 2:
The compensation sources serve as intermediary elements that mediate between the main magnetic flux and the pole structure. By introducing this intermediate magnetic field, the system achieves optimized power transmission while preventing magnetic saturation through flux distribution control
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 approach enhances the efficiency and power supply of rotating machines by partially or fully compensating magnetic leaks, meeting current requirements for compactness and efficiency without enlarging the machine.
Implementation Method 1
A rotor of a synchronous electric machine with salient poles, comprising: induction coils forming a source of magnetomotive force; a magnetic compensation source (400) capable of generating a complementary magnetomotive force (fmm) intended to compensate at least partially for the magnetic flux leakage
Implementation Method 2
induction coils surrounding each polar body formed by a stack of turns
Implementation Method 3
The rotor of a synchronous electric machine with salient poles according to the invention may also have one or more of the characteristics of dependent claims 2 to 8
Data Source
Figure 1~2
Figure 3~5
AI summary
The rotor has multiple salient poles (10), where a magnetomotive force source (3) is distributed on each of the salient poles. The magnetomotive force source generates magnetic flux to encompass an armature of a stator, where a part of the magnetic flux is generated by dispersing the magnetomotive force source between the salient poles of the rotor. The magnetomotive force source is realized by induction coils (3). The magnetic compensation source is mounted between two pole tips at a level of an interpolar space in a detachable manner.