Synchronous Sensor Sampling for Accurate FOC Current Control
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Solution Overview
Problem
Existing systems face challenges in achieving synchronous sampling of sensor signals, leading to inaccurate current control and reduced functional safety in field-oriented control (FOC) systems, particularly in electric motors, resulting in torque ripple, instability, and reduced efficiency.
Innovation Solution
Implementing a system with a first and second sensor configured to receive a synchronization trigger, enabling synchronous sampling of their respective signals, and transmitting output signals that include synchronized samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If asynchronous sampling is used for sensor signals in FOC systems, then device complexity is reduced, but current control accuracy deteriorates leading to torque ripple and instability
Solution Approach 1:
The patent applies preliminary action by generating a sampling trigger signal that预先 coordinates the sampling timing of multiple sensors. The trigger signal is generated before the actual sampling occurs, ensuring that all sensors (current sensor and angle sensor) sample their signals simultaneously at predetermined time points, thereby achieving synchronous sampling without complex real-time synchronization mechanisms.
2Measurement precision
If synchronous sampling is implemented using traditional coordination methods, then current control accuracy is improved, but device complexity and controller burden increase
Solution Approach 1:
The patent applies self-service by enabling the sampling trigger signal to autonomously coordinate the sampling of multiple sensors without requiring complex controller intervention. The trigger signal inherently contains the synchronization information, and the sensors automatically align their sampling based on this trigger, reducing the controller burden while maintaining high current control accuracy.
Data Source
AI summary
A system may include a first sensor and a second sensor. The second sensor may be configured to receive a trigger associated with synchronizing sampling of a second sensor signal with sampling of a first sensor signal associated with the first sensor. The second sensor may be configured to obtain a second sample associated with a second sensor signal based on the trigger, wherein the second sample is synchronous with a first sample associated with the first sensor signal. The second sensor may be configured to transmit an output signal that includes information associated with the second sample.