Permanent Magnet Generator Steel Selection for Load Voltage Limits
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Solution Overview
Problem
Existing generators are not adequately designed to meet the specific voltage requirements of predefined loads, such as induction motors driving refrigeration units, while maintaining efficiency, cost-effectiveness, and size constraints.
Innovation Solution
A generator design that utilizes a preselected steel with controlled relative apparent permeability, combined with a stator and rotor configuration featuring permanent magnets, to meet both hot and cold operating conditions of the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional generators are designed to meet voltage requirements, then voltage stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by carefully selecting steel with specific relative apparent permeability values (below 500 at hot high current transient loaded conditions, and above 10 at cold no load conditions) to inherently control output voltage within specified limits without adding complex control systems. This material parameter selection resolves the contradiction by achieving voltage stability through material properties rather than complex generator design
Solution Approach 2:
The patent implements preliminary action by preselecting steel with appropriate magnetic properties before generator assembly and operation. The steel is chosen in advance to have specific relative apparent permeability characteristics that will automatically maintain voltage stability under varying operating conditions, eliminating the need for post-assembly complex voltage regulation mechanisms
2Volume of moving object
If generator size is reduced to meet cost and space constraints, then manufacturing cost and space requirements are improved, but voltage control capability deteriorates
Solution Approach 1:
The patent uses parameter changes by selecting steel with specific relative apparent permeability values to achieve voltage control in a compact generator design. The magnetic properties of the preselected steel inherently regulate voltage output, allowing smaller generator dimensions while maintaining voltage control capability that would otherwise require larger, more complex designs
3Power
If steel permeability is increased to improve voltage output, then power generation capability is improved, but voltage stability under varying conditions deteriorates
Solution Approach 1:
The patent applies parameter changes by selecting steel with optimized relative apparent permeability values that balance power generation and voltage stability. The steel's magnetic properties are carefully chosen to provide sufficient power output while inherently maintaining voltage within specified limits across varying operating conditions, resolving the trade-off between power and stability
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 generator effectively maintains output voltage within specified limits across varying load conditions, ensuring efficient operation while minimizing size and cost.
Implementation Method 1
a rotor comprising a rotor core with a rotor lamination stack made of the steel and a plurality of permanent magnets for establishing a rotating magnetic field within the generator
Data Source
AI summary
Embodiments of the present invention are directed to a generator for connecting to a predefined load, where the generator is designed and constructed to meet one or more requirements of the predefined load. In specific embodiments the one or more requirements include providing a minimum output voltage while starting the predefined load at or above ambient temperature and providing an output voltage that does not exceed an upper voltage limit while being driven at full speed without any load current at or below ambient temperatures, while maintaining high efficiency under a specified full load running condition and keeping the overall cost and size of the generator low.