Motor Control Device Oscillation Detection and Gain Adjustment
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Solution Overview
Problem
Conventional motor control devices for pressure control in industrial machines face challenges in adjusting the proportional constant and elastic constant of pressurization targets, leading to unstable control systems, increased complexity, and longer adjustment times due to the need for trial-and-error methods and additional memory and calculation loads.
Innovation Solution
A motor control device that performs pressure control with a fixed gain parameter for speed or position control, detecting oscillation and overshoot amounts, and adjusts the control parameters to maintain these within acceptable thresholds, thereby improving control performance and stability without requiring extensive trial-and-error procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the control parameter (gain) is increased to improve response speed and reduce settling time, then the system reaches target pressure faster, but oscillation occurs and control stability deteriorates
Solution Approach 1:
The patent applies dynamic adjustment of the control parameter (gain) based on the detected oscillation state. The gain is automatically increased or decreased in real-time according to the oscillation amount, transforming the static gain setting into a dynamic adaptive control mechanism. This resolves the contradiction by allowing high gain when stable and reducing gain when oscillation occurs, achieving both fast response and stability.
Solution Approach 2:
The patent implements a feedback mechanism where the oscillation detection unit continuously monitors the pressure signal and feeds back the oscillation amount to the control parameter adjustment unit. This closed-loop feedback enables automatic gain adjustment based on actual system behavior, resolving the contradiction between response speed and stability by adapting the gain to the current oscillation state.
2Stability of the object's composition
If the control parameter (gain) is decreased to eliminate oscillation and improve stability, then control stability is maintained, but the time to reach target pressure increases and disturbance compensation becomes slower
Solution Approach 1:
The control parameter is dynamically adjusted based on real-time oscillation detection rather than being fixed at a conservative low value. When the system is stable, the gain can be high for fast response; when oscillation occurs, the gain is temporarily reduced. This dynamic approach eliminates the need to permanently reduce gain for stability, thus reducing the time to reach target pressure while maintaining stability when needed.
Solution Approach 2:
The feedback mechanism allows the system to maintain high gain for fast response most of the time, only reducing gain temporarily when oscillation is detected. This resolves the contradiction by using feedback to maintain high performance (fast response) while briefly reducing gain only when necessary for stability, minimizing the overall time loss.
3Reliability
If conventional pressure control computation is used to compensate for disturbance, then disturbance can be removed, but it requires significant adjustment time and complex procedures with multiple parameters
Solution Approach 1:
The patent implements self-service automatic adjustment where the system monitors its own oscillation state and automatically adjusts the control parameter without requiring external intervention or complex adjustment procedures. The oscillation detection unit and control parameter adjustment unit work together to autonomously optimize the gain, eliminating the need for manual trial-and-error adjustment and reducing adjustment time while maintaining reliable disturbance compensation.
Solution Approach 2:
The feedback mechanism provides continuous monitoring of oscillation and automatic adjustment of the control parameter, replacing complex manual adjustment procedures with an automated closed-loop system. This resolves the contradiction by maintaining reliable disturbance compensation through continuous feedback-based automatic adjustment, significantly reducing the time and complexity of parameter adjustment compared to conventional methods.
4Loss of time
If automatic oscillation-based adjustment is implemented, then adjustment time is reduced and control performance is improved, but the device complexity increases due to additional oscillation detection and parameter adjustment units
Solution Approach 1:
The oscillation detection unit and control parameter adjustment unit are designed to be integrated into the existing pressure control system, serving multiple functions. The oscillation detection unit analyzes the pressure signal for oscillation while the adjustment unit modifies the control parameter, creating a multi-functional module that reduces overall system complexity despite adding automatic adjustment capabilities. This resolves the contradiction by implementing automatic adjustment with minimal additional complexity through functional integration.
Data Source
AI summary
A motor control device. When the motor control device executes pressure control of which a minor loop is speed control or position control, the pressure control is executed in a manner that pressurization or depressurization is performed while a control parameter of the speed control is fixed; a control parameter of the pressure control is gradually increased; an oscillation amount is successively detected and stored. If the oscillation amount exceeds an acceptable value, on the basis of the control parameter of the pressure control and the oscillation amount stored during adjustment, the control parameter of the pressure control is adjusted such that the oscillation amount is equal to or less than the acceptable value.