Motor Control Apparatus Command Correction for Frequency Analysis
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Solution Overview
Problem
Existing motor control systems face challenges in accurately obtaining frequency characteristics due to command values with high frequencies and large amplitudes, leading to output saturation and non-correspondence between command and measured values, which results in inappropriate frequency analysis.
Innovation Solution
A motor control apparatus that includes a command generating portion, an output value determining portion, a command value correcting portion, and a measured value acquiring portion, which corrects the command value when the output value exceeds the motor's capabilities, ensuring appropriate frequency analysis by adjusting the amplitude and preventing output saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the command value has high frequency and large amplitude to improve frequency analysis accuracy, then the frequency characteristic measurement precision is improved, but the motor and object machine cannot follow the command value, leading to output saturation and driving value exceeding motor capabilities
Solution Approach 1:
The system dynamically adjusts the command value based on real-time motor capability assessment. The command value generating portion modifies the command value according to the frequency characteristic of the motor and object machine, ensuring the command remains within achievable limits while maintaining measurement accuracy. This dynamic adaptation prevents output saturation and ensures reliable correspondence between command and actual motor response.
Solution Approach 2:
The system changes the parameters of the command value (amplitude, frequency) based on the measured frequency characteristics of the motor and object machine. By adjusting these parameters to match the actual capabilities of the system being tested, the invention achieves accurate frequency characteristic measurement without causing output saturation or command-value non-correspondence.
2Reliability
If the command value is corrected to prevent output saturation, then the reliability of driving value correspondence is improved, but the amplitude must be reduced which may affect frequency analysis accuracy
Solution Approach 1:
The system employs feedback by measuring the actual frequency characteristics of the motor and object machine, then using this information to adjust the command value. This closed-loop approach ensures that the command value remains within the motor's capability limits while maintaining sufficient amplitude for accurate frequency analysis, thus preserving both reliability and measurement precision.
Solution Approach 2:
The system performs preliminary frequency characteristic measurement to determine the appropriate command value parameters before conducting the main frequency analysis. This preliminary action allows the system to set optimal command value amplitude and frequency that will prevent output saturation while ensuring adequate signal strength for accurate measurement.
Data Source
AI summary
The present invention realizes a motor control apparatus and the like capable of obtaining an appropriate frequency characteristic. The motor control apparatus of the present invention includes a command value generating portion (10), a torque saturation detecting portion (61) for determining whether a driving value based on a command value exceeds a driving value capable of being output from the apparatus, a current saturation detecting portion (71), a voltage saturation detecting portion (72), and a command value correcting portion (20) for correcting the command value when the driving value is determined as being exceeded.