Motor Control Device Vector Control Non-Interference Compensation
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Solution Overview
Problem
Existing motor control devices performing vector control on AC motors face challenges in reducing the influence of interference components, particularly at high-speed rotation ranges, which deteriorates the responsiveness of current control.
Innovation Solution
A motor control device configuration that includes a vector control unit with current control units, non-interference control units, and integral gain adjustment mechanisms to calculate compensation values based on motor rotation speed, using variable integral gains to cancel out interference components generated in specific rotation ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If non-interference control is performed to cancel interference components, then control precision is improved, but device complexity increases
Solution Approach 1:
The non-interference control is divided into two distinct units: a first non-interference control unit that operates across all rotation ranges, and a second non-interference control unit that specifically targets high-speed rotation ranges. This segmentation allows each unit to specialize in different aspects of interference cancellation, improving overall control precision while managing complexity through functional division.
Solution Approach 2:
The second non-interference control unit dynamically activates based on motor rotation speed, specifically engaging when the motor operates in high-speed rotation ranges where interference components become significant. This dynamic approach ensures that the additional control complexity is only introduced when necessary, optimizing the balance between precision and device complexity.
2Speed
If variable integral gain is used to cancel interference components in specific rotation ranges, then current control responsiveness is improved, but device complexity increases
Solution Approach 1:
A variable integral gain is employed in the second non-interference control unit, where the gain value changes dynamically based on motor rotation speed. This allows the control system to adapt to different operating conditions, particularly enhancing current control responsiveness in high-speed rotation ranges where interference components are most problematic, while maintaining simpler operation in other ranges.
Solution Approach 2:
The integral gain parameter is modified based on motor rotation speed to optimize control performance. By adjusting this parameter according to operating conditions, the system achieves improved current control responsiveness in specific rotation ranges without requiring a complete redesign of the control architecture.
3Measurement precision
If feedback calculation is performed to calculate voltage command values, then control precision is improved, but loss of energy increases
Solution Approach 1:
The first non-interference control unit calculates compensation values in advance based on q-axis current command values, before the actual voltage command values are finalized. This preliminary action allows interference components to be canceled proactively, improving control precision while reducing the need for intensive real-time feedback calculations that consume energy.
Data Source
AI summary
This motor control device includes a vector control unit. The vector control unit includes: a current control unit that calculates a before-compensation d-axis voltage command value and a before-compensation q-axis voltage command value; a first non-interference control unit that calculates a first d-axis non-interference compensation value on the basis of a q-axis current command value to compensate for the before-compensation d-axis voltage command value and calculates a first q-axis non-interference compensation value on the basis of a d-axis current command value to compensate for the before-compensation q-axis voltage command value; and a second non-interference control unit that cancels out an interference component of a d-axis current generated in a specific rotation range of a motor with a q-axis current and an interference component of the q-axis current generated in the specific rotation range with the d-axis current by using a variable integral gain varying depending on a motor rotation speed.