Torque Compensation Maps for Rotating Electric Machine Control
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Solution Overview
Problem
Conventional rotating-electric-machine control apparatuses face accuracy issues in torque control due to the lack of torque compensation maps for multiple control methods, leading to deviations between torque command values and output torque when control methods are switched.
Innovation Solution
A rotating-electric-machine control apparatus that includes a voltage applying device, rotation speed detector, current detector, torque controller, and current controller, which utilizes multiple torque compensation maps and a selector to adjust the torque command based on the selected control method, ensuring accurate torque control by calculating torque compensation amounts corresponding to the operating control method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single torque compensation amount map is used for multiple control methods, then the device complexity is reduced, but the torque control accuracy deteriorates when control methods are switched
Solution Approach 1:
The patent divides the single torque compensation map into multiple separate maps, each dedicated to a specific control method. The torque control device includes multiple torque compensation amount maps (first torque compensation amount map, second torque compensation amount map, etc.), where each map stores torque compensation amounts corresponding to its specific control method. This segmentation ensures that each map can be optimized for its designated control method, preventing accuracy deterioration when control methods are switched.
Solution Approach 2:
The patent implements dynamic selection of torque compensation maps based on the currently active control method. The torque control device selects the appropriate torque compensation amount map according to the control method being used (e.g., selecting the first torque compensation amount map when the first control method is active, and the second torque compensation amount map when the second control method is active). This dynamic adaptation ensures optimal torque control accuracy across different operating conditions.
2Adaptability or versatility
If control methods are switched based on rotation speed or torque command value, then the adaptability to different operating conditions is improved, but the torque control accuracy deteriorates due to lack of method-specific compensation
Solution Approach 1:
The patent prepares multiple torque compensation amount maps in advance, each pre-calculated and stored for a specific control method. Instead of calculating compensation amounts dynamically during control method switching, the system has pre-computed compensation values ready for each control method scenario. This preliminary preparation eliminates delays and ensures accurate torque compensation is immediately available when control methods are switched based on rotation speed or torque command value.
Solution Approach 2:
The patent introduces the torque compensation amount maps as intermediary elements between the control method selector and the torque controller. These maps act as mediators that translate the selected control method into appropriate torque compensation values. The torque control device uses these intermediate compensation maps to bridge the gap between different control methods, ensuring smooth transitions and maintaining torque control accuracy throughout the switching process.
Data Source
AI summary
The rotating-electric-machine control apparatus is provided with two or more torque compensation amount maps that each store a torque compensation amount corresponding to a detection rotation speed and a first torque command and a torque compensation amount map selector that selects a single torque compensation amount map from the two or more torque compensation amount maps, based on at least one of the detection rotation speed and control information indicating a control method utilized by the voltage applying device.