Non-oriented electrical steel sheet composition for low core loss
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Solution Overview
Problem
Existing non-oriented electrical steel sheets face challenges in reducing high-frequency core loss while maintaining productivity, especially when the relative amount of Al exceeds a certain limit, leading to increased hysteresis loss and decreased productivity.
Innovation Solution
Incorporating a specific chemical composition with controlled amounts of Si, Al, P, and Mn, along with precise texture control through grain size management and annealing processes, to maintain low high-frequency core loss without compromising productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the amount of Al is increased to decrease core loss, then specific resistance increases and core loss decreases, but hysteresis loss increases and productivity decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the amount of Al within 1.00-2.70 mass% and maintaining specific compositional ratios (Al/(Si+Al) between 0.30-0.50, Al/(Si+Al+Mn) between 0.20-0.40). This optimized parameter range increases specific resistance to reduce core loss while avoiding excessive hysteresis loss and maintaining productivity.
Solution Approach 2:
The patent uses composite material principles by combining multiple alloying elements (Si, Al, Mn, P, Ti, V, Nb, Zr) in specific proportions to create a non-oriented electrical steel sheet with balanced properties. The synergistic effect of these elements achieves low core loss while maintaining adequate productivity and mechanical properties.
2Loss of energy
If the amount of Si and Al is increased to increase specific resistance, then core loss decreases, but cracks and ruptures appear during manufacture
Solution Approach 1:
The patent applies parameter changes by optimizing the amounts of Si (0.50-2.70 mass%) and Al (1.00-2.70 mass%) within specific ranges and controlling their ratio. This balanced composition increases specific resistance to reduce core loss while preventing excessive hardness that would cause cracks and ruptures during manufacturing.
Solution Approach 2:
The patent applies local quality by differentiating the roles of Si and Al: Si primarily increases specific resistance, while Al provides a more balanced effect with less impact on hardness. The controlled ratio ensures local optimization of electrical properties without compromising manufacturability.
3Power
If the rotation rate of drive motor is increased to compensate for decrease in torque, then output is maintained, but frequency of magnetic field increases and core loss increases
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical composition parameters (Si: 0.50-2.70 mass%, Al: 1.00-2.70 mass%, Mn: 0.10-3.00 mass%, P: 0.005-0.100 mass%) to achieve frequency-dependent core loss reduction. The specific compositional ratios ensure low core loss across a wide frequency range, enabling high-speed motor operation with maintained efficiency.
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 solution effectively reduces high-frequency core loss and enhances the energy efficiency of electrical machinery, allowing for easier punching and reduced manufacturing costs, while maintaining high productivity and yield.
Implementation Method 1
a specific resistance of 60.0×10−8 Ω·m or higher at room temperature
Implementation Method 2
the hysteresis loss increases with magnetostriction which increases as the relative amount of Al increases
Implementation Method 3
the hysteresis loss increases with magnetostriction which increases as the relative amount of Al increases
Data Source
AI summary
A non-oriented electrical steel sheet includes C: 0 to 0.0050 mass %, Si: 0.50 to 2.70 mass %, Mn: 0.10 to 3.00 mass %, Al: 1.00 to 2.70 mass %, and P: 0.050 to 0.100 mass %. In the non-oriented electrical steel sheet, Al/(Si+Al+0.5×Mn) is 0.50 to 0.83, Si+Al/2+Mn/4+5×P is 1.28 to 3.90, Si+Al+0.5×Mn is 4.0 to 7.0, the ratio of the intensity of {100} plane I{100} to the intensity of {111} plane I{111} is 0.50 to 1.40, the specific resistance is 60.0×10−8 Ω·m or higher at room temperature, and the thickness is 0.05 mm to 0.40 mm.