DC Machine Speed Control with Base Voltage and PID Adjustment
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Solution Overview
Problem
The existing PID speed control method for DC machines is plagued by slow response times and significant overshoot due to the dominant role of the integral component, which requires substantial convergence time for stability.
Innovation Solution
The proposed method adjusts the speed control equation by incorporating a speed base voltage and a PID adjustment voltage, using a nonlinear proportional relationship to improve convergence speed and stability, with coefficients adjusted for optimal performance, and employs a digital-recursive control algorithm for incremental calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PID control method is used for DC machine speed control, then the control structure is simple and widely applicable, but the response time becomes slow and significant overshoot occurs
Solution Approach 1:
The control system is segmented into three independent modules: speed upper limit detection module, acceleration limitation module, and deceleration limitation module. Each module handles specific control tasks separately, allowing optimized response in each phase without compromising overall system simplicity.
Solution Approach 2:
The control system dynamically adjusts acceleration and deceleration limits based on real-time operating conditions. The acceleration limitation module and deceleration limitation module modify control parameters adaptively, enabling fast response while preventing overshoot through dynamic parameter adjustment rather than fixed PID parameters.
2Ease of manufacture
If PID control method is used for DC machine speed control, then the control structure is simple and widely applicable, but significant overshoot occurs
Solution Approach 1:
The speed upper limit detection module performs preliminary detection of speed conditions before overshoot occurs. By detecting when speed approaches the upper limit and preemptively adjusting control signals, the system prevents overshoot before it happens, maintaining stability without complex control structures.
Solution Approach 2:
The acceleration limitation module and deceleration limitation module perform preliminary control actions by setting maximum acceleration and deceleration rates. These preliminary constraints on rate of change prevent the system from entering unstable states, ensuring smooth transitions and eliminating overshoot while keeping the control structure simple.
Data Source
AI summary
A control method of direct current (DC) machine includes the following steps: obtaining a target speed n, detecting a current speed nk, calculating a current rotating speed difference ek, calculating a speed base voltage W according to the current speed nk, calculating a PID adjustment voltage V according to the current rotating speed difference ek, calculating an output voltage U according to the PID adjustment voltage V and the speed base voltage W, and driving the DC machine according to the output voltage U.