Research On DC Motor Control System Based On Energy-cycle Control

Although the existing DC motor control system has good steady state performance,there are still some shortcomings in the transient performance.Some factors will affect the generation of overshoot and oscillation during transients,such as the design of power circuit,controller and so on.The design of power circuit,controller,and Thus,DC motor control system has been studied in this paper,including the topology of speed regulating circuit,and the control strategy of the whole system.First and foremost,DC motor driver has been studied deeply.The buck converter is the most basic DC motor driver,and the paper is intended to improve its resistance capacity against load disturbance.On the basis of the topology of the traditional Buck converter,a dual-capacitor voltage-pump buck converter and a single-capacitor voltage-pump buck converter have been proposed respectively.By increasing the voltage across the inductor,the two converters can increase the rate of inductor current during load transients.Thus,dynamic response can be improved.The operation modes of these two converters has been introduced,and then,a hysteresis control algorithm based on output voltage has been proposed to switch the operation modes during load transients.The simulations have been conducted to verify the functionality of the proposed converters in PSIM.The simulation results have shown that the transient performance of the converters proposed in this paper has been significantly improved compared to that of the conventional converter with current mode controller.In the second place,the paper has studied the operating mechanism of the DC motor control system from the perspective of energy,and a one-cycle energy-loop control has been proposed.The paper has introduced its implementation method in CCM and DCM respectively and analyzed its transient performance.At the same time,a new load torque observer has been proposed from the perspective of energy conversion.An efficiency transfer factor concept has been proposed to modify the energy model of the system with the consideration of the energy loss.The simulations have been carried out,and the simulation results have illustrated that the system with one-cycle energy-loop controller has good steady-state performance and its transient performance is better than the system with traditional PI controller.What's more,a constant energy-loop control has been proposed in this paper.Similarly,its implementation methods in CCM and DCM were introduced,and the transient performance of the system with constant energy-loop controller was analyzed.The paper proposed a new method to suppress the starting current.The simulations have been conducted to verify the functionality of the proposed controller.The system with constant energy-loop controller have good steady-state performance and better transient performance compared with the system with traditional controller.At last,experimental platform was built,and C programming language was designed using TMS320F28335 as its control core to verify the functionality of the proposed control strategies.On the one hand,as for buck converter,the experiment was performed to evaluate the feasibility and applicability of votage hysteresis controller.The circuit design guideline was provided,and the programming flowcharts of traditional current-mode controller and votage hysteresis controller were given.Finally,the waveforms were presented.The experimental results demonstrated that votage hysteresis control algorithm can be employed to improve the dynamic response during a heavy-to-light load transient as well as during a light-to-heavy load transient,and to simplify the design of the circuit and the feedback loop.On the other hand,a DC motor control system with one-cycle energy-loop controller was presented to validate its performance.The paper introduced the circuit design method in details,and presented the programming flowcharts of traditional cascade controller and one-cycle energy-loop controller.Finally,the paper presented the waveforms.It is concluded that by using the proposed one-cycle energyloop controller,the transient performance can be improved and the the limitations of traditional PI control can be overcome.