AC Rotary Machine Controller Torque Map Unequal Intervals
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Solution Overview
Problem
Existing AC rotary machine controllers face challenges in accurately compensating for torque deviations due to nonlinearity in torque command correction values, which are influenced by rotational speed and torque, leading to increased data requirements and reduced accuracy.
Innovation Solution
An AC rotary machine controller with a torque command correction calculator that uses a correction value setting map with unequal intervals for torque and rotational speed axes, allowing for finer settings in regions with high nonlinearity to improve accuracy while maintaining data efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the interval of the map axes is set equally in all regions, then the device complexity is reduced and data amount is minimized, but the setting accuracy of the torque command correction value deteriorates in regions with high nonlinearity
Solution Approach 1:
The patent applies local quality by setting the map axis intervals differently in different regions of the correction value setting map. Specifically, in regions where nonlinearity is high (such as low rotational speed regions or specific torque ranges), the intervals are set more finely to improve accuracy. In regions where nonlinearity is low, coarser intervals are used to reduce data amount. This localized differentiation resolves the contradiction between accuracy and data size.
Solution Approach 2:
The patent implements dynamic interval setting where the map axis intervals are not fixed uniformly but are adapted based on the local characteristics of the system. The intervals are made variable according to the nonlinearity degree in each region, allowing finer resolution where needed and coarser resolution where not needed, thus dynamically optimizing the balance between accuracy and data efficiency.
2Measurement precision
If the interval of the map axes is set finely in all regions, then the setting accuracy of the torque command correction value is improved, but the data amount of the correction value setting map increases
Solution Approach 1:
The patent applies local quality by setting the map axis intervals differently in different regions of the correction value setting map. Specifically, in regions where nonlinearity is high (such as low rotational speed regions or specific torque ranges), the intervals are set more finely to improve accuracy. In regions where nonlinearity is low, coarser intervals are used to reduce data amount. This localized differentiation resolves the contradiction between accuracy and data size.
Solution Approach 2:
The patent applies partial action by implementing fine interval setting only in specific regions where it is truly necessary (high nonlinearity regions), rather than uniformly across all regions. This partial refinement achieves the necessary accuracy improvement while avoiding the excessive data increase that would result from uniform fine-grained settings throughout the entire map.
3Ease of manufacture
If the interval of the map axes is set equally, then the ease of manufacture is improved, but the setting accuracy in high nonlinearity regions deteriorates
Solution Approach 1:
The patent applies local quality by setting the map axis intervals differently in different regions of the correction value setting map. Specifically, in regions where nonlinearity is high (such as low rotational speed regions or specific torque ranges), the intervals are set more finely to improve accuracy. In regions where nonlinearity is low, coarser intervals are used to reduce data amount. This localized differentiation resolves the contradiction between accuracy and data size.
Data Source
AI summary
To provide an AC rotary machine controller which can improve setting accuracy of torque command correction value in a region where change of torque command correction value to change of rotational speed and torque becomes large and where nonlinearity is high, and can suppress increase in data amount of correction value setting map. In correction value setting map, one or both of a torque axis unequal interval setting that sets interval of the torque command map axis to unequal interval in each rotational speed; and a rotation axis unequal interval setting that sets interval of the rotational speed map axis to unequal interval were done.