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Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
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Phase-lead and Phase-lag Controllers01:22

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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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PD Controller: Design01:26

PD Controller: Design

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In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
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Time and frequency -Domain Interpretation of PI Control01:27

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Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
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Controller Configurations01:22

Controller Configurations

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Controller configurations are crucial in a car's cruise control system because they manage speed over time to maintain a consistent pace regardless of road conditions, thereby meeting design goals. In traditional control systems, fixed-configuration design involves predetermined controller placement. System performance modifications are known as compensation.
Control-system compensation involves various configurations, most commonly series or cascade compensation, in which the controller...
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PID Controller01:19

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Proportional-Integral-Derivative (PID) controllers are widely used in various control systems to enhance stability and performance. In a thermostat, it adjusts heating or cooling based on the temperature difference between the actual and desired levels. They are often used in automotive speed systems, effectively managing sudden speed changes while maintaining a constant speed under varying conditions. On the other hand, PI controllers, commonly employed in voltage regulation, enhance stability...
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Related Experiment Video

Updated: May 25, 2025

The Modular Design and Production of an Intelligent Robot Based on a Closed-Loop Control Strategy
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Cascaded Extended State Observer-Based Composite Sliding-Mode Controller for a PMSM Speed-Loop Anti-Interference

Yifan Xu1,2, Bin Zhang1, Yuxin Kang1,2

  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.

Sensors (Basel, Switzerland)
|February 26, 2025
PubMed
Summary

This study introduces an improved sliding-mode control strategy for permanent magnet synchronous motor (PMSM) drives. The new method significantly reduces speed fluctuations and enhances disturbance rejection for better performance.

Keywords:
cascaded extended state observer (CESO)continuous adaptive fast terminal sliding-mode surface (CAFTSMS)improved sliding-mode control (ISMC)new reaching law (NRL)permanent-magnet synchronous motor (PMSM)quasi-proportional resonant (QPR)

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Area of Science:

  • Electrical Engineering
  • Control Systems

Background:

  • Permanent magnet synchronous motors (PMSM) face speed fluctuations due to cogging torque and time-varying disturbances, especially at low speeds.
  • Existing control strategies struggle with effective disturbance rejection and harmonic suppression in PMSM drive systems.

Purpose of the Study:

  • To develop an advanced anti-interference control strategy for PMSM drives.
  • To improve speed-control performance by mitigating disturbances and reducing speed fluctuations.

Main Methods:

  • An improved sliding-mode control (ISMC) incorporating a continuous adaptive fast terminal sliding-mode surface (CAFTSMS) and a new reaching law (NRL).
  • Integration of a quasi-proportional resonant (QPR) controller to suppress specific system harmonics.
  • Implementation of a cascaded extended state observer (CESO) with a novel structure to address observation delays.

Main Results:

  • The CAFTSMS and NRL effectively boost interference immunity and improve transient response, reducing speed fluctuations.
  • The QPR controller significantly diminishes harmonic amplitudes, enhancing robustness against periodic disturbances.
  • The proposed CESO overcomes traditional observation delays, improving overall system responsiveness.

Conclusions:

  • The developed sliding-mode anti-disturbance control strategy demonstrates excellent performance in overcoming disturbances in PMSM drive systems.
  • The combined approach of ISMC, QPR, and CESO offers a robust solution for enhancing PMSM speed-control accuracy and stability.