Permanent Magnet Synchronous Motor Voltage Vector Power Limiting
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Solution Overview
Problem
Existing methods for operating permanent magnet synchronous motors in motor vehicles require complex power management to limit power consumption within the on-board electrical system, often involving detours through performance measurement and complex engine models.
Innovation Solution
A method that sets a maximum power limit by determining a target voltage vector in the dq coordinate system, ensuring compliance with the maximum power by maintaining the angle of the output voltage vector while reducing its magnitude, eliminating the need for complex engine models and performance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If complex power management methods involving performance measurement and complex motor models are used, then power consumption can be limited within the on-board electrical system, but the device complexity and control complexity increase
Solution Approach 1:
The invention extracts the essential control要素 from complex power management systems, retaining only the critical voltage vector adjustment mechanism while removing unnecessary performance measurement and complex motor models, thereby simplifying the control system while maintaining power limitation capability
Solution Approach 2:
The invention uses a simplified control approach that copies only the essential functionality needed for power limitation, replacing complex measurement and modeling with direct voltage vector manipulation in the dq coordinate system, achieving power control with minimal system complexity
2Power
If the magnitude of the output voltage vector is reduced to comply with maximum power limit, then power consumption is limited, but the motor performance may be compromised
Solution Approach 1:
The invention dynamically adjusts the magnitude of the voltage vector while maintaining its angle, allowing real-time optimization of power consumption versus motor performance based on actual operating conditions and maximum power limits
Solution Approach 2:
The invention changes only the magnitude parameter of the voltage vector while preserving its angular parameter, thereby limiting power consumption without significantly affecting motor performance that depends on the voltage vector's direction in the dq coordinate system
3Ease of manufacture
If the angle of the voltage vector is maintained while reducing its magnitude, then power limitation is achieved with minimal intervention in motor parameters, but the control precision requirements increase
Solution Approach 1:
The invention segments the voltage vector control into two independent components: magnitude adjustment for power limitation and angle maintenance for performance preservation, allowing separate optimization of each parameter with standard control techniques
Data Source
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AI summary
The invention relates to a method for operating a synchronous motor excited by permanent magnets, wherein a desired voltage vector having a desired value is calculated in such a way that the power limitation is maintained for the best possible adherence to a torque requirement. The invention further relates to an associated control device, an associated motor arrangement and an associated storage medium.