Rotary Electric Machine Control Signal Normalization
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Solution Overview
Problem
Existing rotary electric machine systems, such as those in hybrid and electric vehicles, face challenges in normalizing multiple characteristics like torque characteristics beyond magnet temperature control, which is crucial for stable and efficient operation during mass production.
Innovation Solution
A rotary electric machine system with a control unit that normalizes drive control signals based on specific information about induced voltage in the stator coil, compared to predetermined reference information, ensuring the signal falls within a normal distribution range, thereby stabilizing the system's operation and preventing abnormal events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnet temperature control is implemented to prevent permanent demagnetization, then reliability is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies parameter changes by adjusting the d-axis current component based on magnet temperature calculations. When temperature drops below a threshold, the system increases the d-axis current to enhance magnetization, thereby preventing demagnetization through dynamic parameter adjustment rather than complex structural modifications
Solution Approach 2:
The system implements feedback control by continuously calculating magnet temperature based on operating conditions and using this information to adjust the d-axis current component. This closed-loop feedback mechanism maintains reliability through intelligent control rather than complex hardware additions
2Manufacturing precision
If drive control signals are normalized using induced voltage comparison, then manufacturing precision is improved, but measurement precision requirements increase
Solution Approach 1:
The patent uses induced voltage as an intermediary parameter to normalize drive control signals. By comparing measured induced voltage against predetermined reference values, the system derives normalization information that adjusts control signals to account for manufacturing variations, thereby improving manufacturing precision through a measurable intermediary quantity
Solution Approach 2:
The system changes the parameter of drive control signals by applying normalization factors derived from induced voltage measurements. This allows the control signals to be adjusted dynamically based on actual motor characteristics, compensating for manufacturing tolerances and achieving consistent performance across production batches
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 results in a stable-quality rotary electric machine system with normalized characteristics from various viewpoints, enhancing operational stability and enabling mass production with consistent performance.
Implementation Method 1
specific information about a value correlated to an induced voltage generated in the stator coil when the rotor of the rotary electric machine is driven
Data Source
AI summary
A stable-quality rotary electric machine system in which one or more rotary electric machine characteristics are normalized from various viewpoints. The rotary electric machine system is provided with: a rotary electric machine having a rotor, a stator, and a stator coil; and a controller configured to execute drive control of the rotary electric machine. The controller applies, to a drive control signal for the rotary electric machine, normalization information, which normalizes the drive control signal for the rotary electric machine, derived by comparing specific information about a value correlated to an induced voltage occurring in the stator coil when the rotor of the rotary electric machine is driven under prescribed conditions and predetermined reference information about the value correlated to the induced voltage occurring in the stator coil. Then, the drive control signal normalized by the application is used to execute the drive control of the rotary electric machine.