Rotating Machine Pole Ratio for Compact Hybrid Power Plant
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Solution Overview
Problem
The existing power plant design for hybrid vehicles is bulky and costly due to the necessity of two soft magnetic element rows in the first rotating machine, limiting design flexibility and increasing manufacturing costs.
Innovation Solution
A power plant configuration with a first rotating machine that includes a stator with armature rows and a magnetic pole row, where the ratio of armature magnetic poles to magnetic poles to soft magnetic material elements is set to 1:m:(1+m)/2, allowing for a single soft magnetic material element row, which reduces size and manufacturing costs while maintaining design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two soft magnetic element rows are used in the first rotating machine, then the magnetic field generation is sufficient, but the size and manufacturing costs increase
Solution Approach 1:
The patent extracts one of the two soft magnetic element rows from the first rotating machine structure. By using only a single soft magnetic material element row disposed between the armature row and the magnetic pole row, the invention eliminates the redundant second soft magnetic element row while maintaining sufficient magnetic field generation capability through the optimized ratio relationship between armature magnetic poles, magnetic poles, and soft magnetic material elements.
Solution Approach 2:
The patent changes the critical parameter of the number of soft magnetic material elements to (1+m)/2, where m is the ratio of magnetic poles to armature magnetic poles. This parameter optimization allows the system to achieve adequate magnetic field strength with fewer elements, thereby reducing the size and material quantity while maintaining reliability.
2Reliability
If two soft magnetic element rows are used in the first rotating machine, then the magnetic field generation is sufficient, but the manufacturing costs increase
Solution Approach 1:
The invention removes the redundant second soft magnetic element row from the structure, directly reducing material costs, assembly complexity, and manufacturing time. The single soft magnetic material element row is sufficient to generate the required magnetic field when combined with the optimized number of magnetic poles and armature magnetic poles.
Solution Approach 2:
Instead of creating two identical soft magnetic element rows, the invention uses a single optimized row with precisely calculated number of elements ((1+m)/2), eliminating the need to manufacture, assemble, and align a second row while achieving the same functional outcome.
3Reliability
If the first rotating machine has a specific structural configuration, then the magnetic field generation works, but the design freedom is limited
Solution Approach 1:
The patent establishes a flexible parameter relationship where the number of soft magnetic material elements is defined as (1+m)/2, with m being the ratio of magnetic poles to armature magnetic poles. This parametric formulation allows designers to adjust the configuration based on specific application requirements while maintaining functional reliability, thereby enhancing design freedom.
Solution Approach 2:
The invention introduces dynamic flexibility by allowing the pole numbers and their ratios to be adjusted according to different operational requirements. The relationship between armature magnetic poles, magnetic poles, and soft magnetic material elements can be dynamically optimized for different applications without compromising magnetic field generation capability.
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 enables a more compact power plant with reduced manufacturing costs and enhanced design freedom, while maintaining efficient torque transmission and electrical angular velocity relationships similar to those in planetary gear units.
Implementation Method 1
the stator includes an armature row arranged in a circumferential direction which is formed by a plurality of armatures arranged in a circumferential direction, and generates a rotating magnetic field which rotates in the circumferential direction, by armature magnetic poles generated in the plurality of armatures in accordance with supply of electric power
Implementation Method 2
the soft magnetic material elements are magnetized by the armature magnetic poles generated in the plurality of armatures and the magnetic poles, whereby magnetic lines of force are generated between these elements
Implementation Method 3
the first and second rotors are driven by the generated magnetic lines of force, which causes motive power to be output from the output shaft or the input shaft
Data Source
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AI summary
To provide a power plant which makes it possible to make the power plant more compact in size, reduce manufacturing costs thereof, and improve the degree of freedom in design. The power plant 1 comprises an engine 3, and first and second rotating machines 10 and 20, and drives front wheels 4 by motive power from these. The first rotating machine 10 includes first and second rotors 14 and 15, and a stator 16, and is configured such that a ratio between the number of armature magnetic poles generated in the stator 16, the number of magnetic poles of the first rotor 14, and the number of soft magnetic material cores 15a of the second rotor 15 becomes 1:m:(1+m)/2 (m≠1.0).