Low-Voltage Multicellular Traction Chain With Segmented Coil Powering
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Solution Overview
Problem
High-power electric traction chains face challenges with voltage handling, complexity, and efficiency due to high voltage and current intensities, leading to premature aging and size issues in electrical machines and power converters.
Innovation Solution
The solution involves dividing the windings of the electrical machine into smaller, magnetically coupled partial coils, each powered by reduced voltage, allowing for parallel operation of multiple power converters and batteries, reducing voltage and current intensities, and enabling low-voltage operation without compromising power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage and current intensities are used in electric traction chains, then power delivery capability is improved, but premature aging and reliability deteriorate
Solution Approach 1:
The patent divides the electric machine into multiple independent electric submachines, each operating at lower voltage and current levels. This segmentation allows the system to maintain high total power output while each individual submachine experiences reduced electrical stress, thereby preventing premature aging and improving reliability of the overall traction chain.
2Power
If high voltage and current intensities are used in electric traction chains, then power delivery capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the single complex power converter into multiple simpler power converters, each associated with an electric submachine. Each power converter operates at lower voltage levels with simpler design requirements, reducing the complexity of individual power conversion stages while maintaining the overall high power capability through parallel operation of multiple submachines.
3Power
If high voltage and current intensities are used in electric traction chains, then power delivery capability is improved, but size of electrical machines increases
Solution Approach 1:
The patent divides the electrical machine into multiple smaller electric submachines, each with reduced size requirements since they operate at lower power levels individually. The combined volume of multiple compact submachines is less than a single large high-voltage machine, achieving high total power output while reducing overall size and improving spatial efficiency in the traction chain.
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 reduces the risk of premature aging, minimizes the size and complexity of power converters, enhances efficiency, and allows for safer handling and management of the traction chain, while maintaining equivalent power output.
Implementation Method 1
Each partial coil generates its own magnetic field. The variations over time of the supply current of the partial coils lead to a variation over time of the level of each of the magnetic fields generated. The phase shift applied to the supply voltages of the partial coils then causes a variation over time of the direction of the total magnetic field produced, which causes the rotor to rotate.
Data Source
Figure 1a~1b
Figure 1c
Figure 2
AI summary
A multicellular converter for a low-voltage traction chain. The invention relates to an electric machine and a traction machine utilising said electric machine. The electric traction chain according to the invention comprises an electric machine, a plurality of power converters configured to generate AC power signals associated with the various phases of the electric machine, and a plurality of DC power sources. The electric machine according to the invention comprises a rotor and a stator, the stator comprising at least one winding made from coilings of an insulated conductive material, each winding being associated with one phase of the electric machine, and comprising a plurality of independently powered coils. Each DC power source of the electric machine is associated with a separate power converter, the coils of a same winding are powered by power signals associated with a same phase generated by the separate power converters.