2 results about "Dc motor speed control" patented technology

This invention discloses a DC motor speed control identification method and system based on an improved quasi-Newton method, belonging to the technical field of DC motor speed control system modeling. First, a time-varying nonlinear DC motor speed control system is constructed, and an identification model of this system is obtained. Then, an identification method flow based on the quasi-Newton method under step-size line search is constructed. The optimal step size is obtained through step-size line search for parameter estimation, and a correction strategy is designed to ensure the positive definiteness of the approximation of the Hessian matrix inverse. This invention avoids the oscillation or slow convergence problems caused by a fixed step size by dynamically adjusting the step-size factor, and simultaneously introduces a correction strategy to forcibly guarantee the positive definiteness of the approximation of the Hessian matrix inverse, thereby obtaining more accurate motor model parameters.

This invention discloses a design method for a hyperbolic tangent attraction law in a discrete-time sliding mode controller for a DC motor speed control system. Based on the hyperbolic tangent function, a discrete-time hyperbolic tangent attraction law is constructed. Hyperbolic tangent-type adaptive interference compensation measures are embedded into the discrete-time hyperbolic tangent attraction law to construct a discrete-time hyperbolic tangent attraction law with interference compensation capability, thereby designing a discrete-time sliding mode controller. The output signal is then calculated as the control input signal for the DC motor speed control system, enabling the system to follow the given speed signal. The design method for the hyperbolic tangent attraction law in a discrete-time sliding mode controller provided by this invention features fast convergence and chatter-free characteristics, while also improving the tracking accuracy, anti-interference capability, and effectively reducing output speed fluctuations in the DC motor speed control system.