PMSM dq-Vector Control Under Maximum Power Limits
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Solution Overview
Problem
Existing methods for operating permanent magnet synchronous motors in motor vehicles face challenges in efficiently managing power consumption to adhere to maximum permissible power limits, often requiring complex power measurement and motor modeling.
Innovation Solution
A method that sets a maximum power limit by calculating a setpoint voltage vector in the dq coordinate system, ensuring compliance with power constraints without indirect power measurement or complex motor models, by determining current and output voltage vectors based on torque requirements and power limitations, and adjusting these vectors to maintain motor operation within specified power bounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indirect power measurement and complex motor models are used to manage power consumption, then power management accuracy is improved, but device complexity increases
Solution Approach 1:
The patent extracts the essential elements needed for power management (current vector and voltage vector in dq coordinate system) and eliminates unnecessary components (indirect power measurement systems and complex motor models). By directly using the dq coordinate system representations, the solution removes complex measurement infrastructure while maintaining power management accuracy.
Solution Approach 2:
The patent replaces complex mechanical/power measurement systems with electrical coordinate system transformations. Instead of using physical power measurement devices and complex motor models, the solution substitutes these with mathematical transformations in the dq coordinate system, simplifying the overall system while maintaining precision.
2Power
If maximum permissible current is limited to adhere to power constraints, then power consumption is controlled, but motor performance is reduced
Solution Approach 1:
The patent applies dynamic current vector control in the dq coordinate system, allowing the motor to operate at maximum permissible current limits while maintaining optimal performance. By dynamically adjusting the current vector components (id and iq) based on power constraints and torque requirements, the system achieves both power control and maintained productivity without static current limiting.
Data Source
AI summary
A method for operating a permanent magnet synchronous motor comprises setting a maximum power, determining a current vector and an output voltage vector in the dq coordinate system. A setpoint amount for a setpoint voltage vector is calculated on the basis of the maximum power, the current vector and the output voltage vector. The setpoint voltage vector is generated with the setpoint amount, and then operating the permanent magnet synchronous motor at least with the setpoint voltage vector.