Rotary Machine Controller Power Loss Minimization
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Solution Overview
Problem
Existing rotary electric machine controllers approximate power loss characteristics collectively for normal and overmodulation control, leading to large approximate errors and reduced accuracy in determining the minimum power loss voltage command value.
Innovation Solution
A controller that distinguishes between normal and overmodulation control power loss characteristics, using separate calculations for each to determine the converter voltage command value that minimizes power loss, with specific units for converter voltage command calculation, converter control, and inverter control to manage voltage application in rotary electric machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If normal modulation control and overmodulation control power loss characteristics are collectively approximated, then device complexity is reduced, but measurement precision of power loss characteristics deteriorates
Solution Approach 1:
The patent segments the power loss characteristics into two distinct parts: normal modulation control characteristics and overmodulation control characteristics. By separating these previously collective characteristics into individual approximation models, the system achieves higher measurement precision for each segment while maintaining manageable overall complexity through structured organization of the segmented models.
2Measurement precision
If separate power loss characteristics calculations are performed for normal and overmodulation control, then measurement precision of power loss characteristics is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic selection of power loss characteristic models based on the current modulation mode. The inverter control unit dynamically determines whether normal modulation or overmodulation control is being performed and selects the corresponding power loss characteristic approximation. This dynamic approach enables high measurement precision adapted to operating conditions while avoiding the need for permanently complex control structures that would be required if all models were always active.
Data Source
AI summary
To provide a controller for rotary electric machine apparatus which can calculate the voltage command value of the converter which reduces power loss with good accuracy, in the case where the normal modulation control and the overmodulation control are switched and performed. A controller for rotary electric machine apparatus sets a system voltage that power loss becomes the minimum as the converter voltage command value, based on a power loss characteristics of the normal modulation control which is a power loss characteristics of at least the inverter with respect to the system voltage in performing the normal modulation control, and a power loss characteristics of the overmodulation control which is a power loss characteristics of at least the inverter with respect to the system voltage in performing the overmodulation control.