Motor Controller Start-Up Alignment Correction for PMSM FOC
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Solution Overview
Problem
Existing motor control systems face challenges in accurately determining motor parameters and alignment errors during start-up, which affect the efficiency and accuracy of Field-Oriented Control (FOC) techniques in Permanent Magnet Synchronous Motors (PMSMs).
Innovation Solution
A method involving high frequency injection signals is used during a start-up mode to extract motor parameters and determine alignment errors, with corrections applied to generate corrected motor parameters for precise control, utilizing a motor controller with separate start-up and control modes to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high frequency injection signal is applied during start-up mode, then motor parameter extraction accuracy is improved, but system complexity increases
Solution Approach 1:
The control system is divided into two distinct operational modes: start-up mode for parameter extraction and control mode for normal operation. This segmentation allows the complex high-frequency injection and parameter correction functions to be isolated to the start-up phase, improving measurement accuracy without permanently increasing the complexity of the ongoing control system.
Solution Approach 2:
Motor parameters are extracted and corrected during the start-up mode before normal control operations begin. By performing the complex parameter extraction and alignment error correction in advance, the system achieves high measurement precision without requiring the complex processing mechanisms to remain active during normal operation.
2Measurement precision
If motor parameters are corrected based on alignment error, then control accuracy is improved, but processing time increases
Solution Approach 1:
The alignment error determination and motor parameter correction are performed during the start-up mode before normal control operations commence. By completing these time-consuming calculations in advance, the system achieves high control accuracy without incurring time penalties during the actual control phase.
Solution Approach 2:
The control process is segmented into parameter extraction phase (start-up mode) and execution phase (control mode). The time-intensive parameter correction operations are confined to the start-up segment, allowing accurate control to be achieved without prolonged processing time during operational phases.
Data Source
AI summary
According to some embodiments, a motor controller has a first controller operating in a start-up mode and configured to apply a high frequency injection signal to a motor, extract a motor parameter based on a measured response to the high frequency injection signal, determine an alignment error of the motor based on the measured response, and correct the motor parameter based on the alignment error to generate a corrected motor parameter, and a second controller operating in a control mode and configured to control the motor based on the corrected motor parameter