Motor Speed Transition Control for Stable Hydraulic Pressure
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Solution Overview
Problem
Existing motor control systems face issues where the rotation speed of an induction motor decreases drastically when transitioning from current control to speed control, especially due to varying motor loads, which can result in an unachieved desired rotation state.
Innovation Solution
A motor control device comprising a current control part, a rotation speed calculation part, an acquisition part, a speed control part, and a correction part that adjusts the target rotation speed based on the actual rotation speed to maintain consistent motor speed during the transition from current control to speed control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If current control is uniformly transitioned to speed control immediately, then the control response is fast, but the rotation speed decreases drastically
Solution Approach 1:
The correction part performs preliminary action by calculating a corrected target rotation speed based on the actual rotation speed before the speed control part executes speed control. This preliminary correction prevents the drastic decrease in rotation speed by adjusting the target value in advance, rather than reacting after the speed drop occurs.
Solution Approach 2:
The correction part uses feedback from the actual rotation speed (calculated by the rotation speed calculation part) to adjust the target rotation speed. By continuously monitoring the actual speed and correcting the target accordingly during the transition, the system maintains stable rotation speed while switching from current control to speed control.
2Ease of operation
If current control is used to rotate the motor from stop state, then the motor can start effectively, but the desired rotation state may not be realized due to load variations
Solution Approach 1:
The rotation speed calculation part continuously monitors the actual rotation speed of the motor, providing feedback to the correction part. This feedback mechanism enables the system to detect deviations from the desired rotation state caused by load variations and correct the target rotation speed accordingly, ensuring accurate rotation control.
Solution Approach 2:
The correction part dynamically adjusts the target rotation speed based on the relationship between the actual rotation speed and the original target rotation speed. This dynamic adjustment allows the system to adapt to changing load conditions during motor operation, maintaining rotation accuracy throughout the transition from current control to speed control.
Data Source
AI summary
A motor control device according to the disclosure includes: a current control part, performing current control for rotating a motor from a stop state; a rotation speed calculation part, calculating an actual rotation speed of the motor; an acquisition part, acquiring a target rotation speed of the motor; a speed control part, performing speed control of the motor, so that the actual rotation speed of the motor becomes the target rotation speed; and a correction part, at a time when a current control state is transitioned to a speed control, correcting the target rotation speed based on a relation between the actual rotation speed and the target rotation speed. When the target rotation speed is corrected, the speed control part performs the speed control so that the actual rotation speed becomes the target rotation speed corrected by the correction part.