IPMSM Current Map Switching for EV Torque Ripple Noise
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Solution Overview
Problem
Eco-friendly vehicles equipped with Interior Permanent Magnet Synchronous Motors (IPMSMs) face challenges in reducing motor noise caused by torque ripple, which affects NVH performance, especially during regenerative braking, as conventional motor drive control methods prioritize maximum efficiency over noise reduction.
Innovation Solution
A motor noise reduction control apparatus and method that allows the motor to be driven using either a maximum motor efficiency control application current map for high fuel economy or a minimum torque ripple control application current map for low-noise operation, enabling selection between these modes to optimize NVH performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If maximum motor efficiency control application current map is used, then fuel economy is improved, but motor noise increases due to torque ripple
Solution Approach 1:
The system dynamically switches between two current map strategies based on driving conditions. The driving mode selector changes the control approach in real-time, using maximum efficiency control during acceleration and minimum torque ripple control during constant speed cruising, thereby adapting the motor control to optimize both fuel economy and noise reduction at different operational phases
Solution Approach 2:
The invention changes the control parameters by switching between two different application current maps. The maximum motor efficiency control application current map optimizes for fuel economy, while the minimum torque ripple control application current map optimizes for noise reduction. The system selects appropriate parameters based on driving mode, effectively trading off between efficiency and noise characteristics
2Object-generated harmful factors
If minimum torque ripple control application current map is used, then motor noise is reduced, but fuel economy deteriorates
Solution Approach 1:
The system dynamically selects the appropriate control strategy based on real-time driving conditions. During acceleration phases where power demand is high, the system switches to maximum efficiency control. During constant speed cruising where noise sensitivity is higher, it switches to minimum torque ripple control, thereby dynamically balancing noise reduction with fuel economy
Solution Approach 2:
The control system periodically evaluates driving conditions and switches between control modes accordingly. The driving mode selector continuously monitors operational parameters and alternates between maximum efficiency control and minimum torque ripple control based on the periodic assessment of whether the vehicle is in acceleration or constant speed phase
Data Source
AI summary
A motor noise reduction control apparatus of an eco-friendly vehicle includes: a driving mode selector for selecting one of a high fuel economy driving mode and a low-noise driving mode; and a motor controller configured to generate a current command for motor drive using a maximum motor efficiency control application current map when the high fuel economy driving mode is selected, and to generate a current command for motor drive using a minimum torque ripple control application current map when the low-noise driving mode is selected.