Magnetic Flux Current Control Map for Electric Vehicle Motor
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Solution Overview
Problem
Conventional methods for controlling electric vehicle motors, such as those using interior permanent magnet synchronous machines, face challenges in stability and efficiency due to battery voltage fluctuations, requiring additional algorithms and offline control methods that struggle to reflect real-time vehicle conditions and maximize system efficiency.
Innovation Solution
A system and method that generates a magnetic flux based current control map using battery output voltage, motor speed, and torque, allowing for dynamic current control map generation and real-time voltage fluctuation reflection, thereby maintaining control stability and improving accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a velocity based current control map is constructed using experimental data, then torque control stability is improved, but development time increases and the system cannot respond to real-time voltage fluctuations
Solution Approach 1:
The patent changes the basis of the control map from velocity-based experimental data to magnetic flux-based real-time calculations. By using magnetic flux as the fundamental parameter and calculating current commands dynamically based on actual battery voltage and motor speed, the system eliminates the need for extensive offline experimental data collection while maintaining torque control stability and enabling real-time adaptation to voltage fluctuations.
2Reliability
If additional algorithms are added to compensate for battery voltage fluctuations, then control stability under voltage variation is improved, but device complexity increases
Solution Approach 1:
The patent implements a dynamic control approach where the current control map is regenerated in real-time based on actual battery voltage and motor speed conditions. Instead of adding static compensation algorithms for different voltage scenarios, the system dynamically calculates the appropriate current commands using magnetic flux relationships, allowing the control parameters to adapt automatically to voltage fluctuations without increasing algorithmic complexity.
3Ease of operation
If offline control methods are used with predetermined current control maps, then control implementation is simplified, but the system cannot reflect real-time vehicle conditions and maximize efficiency
Solution Approach 1:
The patent enables the control system to self-adjust by calculating current commands based on real-time battery voltage and motor speed measurements. The magnetic flux based control map automatically adapts to current vehicle conditions without requiring external intervention or complex lookup tables, allowing the system to maintain simplicity while achieving real-time optimization of motor efficiency and performance.
Data Source
AI summary
Disclosed are a system and a method for controlling a motor of an electric vehicle. In particular, an output voltage from a battery used to provide power to a motor of an electric vehicle, a speed and a torque of the motor are used to generate a magnetic flux based current control map. A current control command is then generated using the magnetic flux based current control map.