Method and Simulation of DC Motor Variable Frequency Speed Control Based on Single-chip Microcomputer
At present,harmonic loss and harmonic signals outputted by the inverter are affecting the stability of DC motor frequency conversion speed control.Therefore,a method for DC motor frequency conversion speed regulation based on single-chip microcomputer was put forward.At first,a state space model of DC motor frequency conversion speed regulation was built,from which the operating state of the system could be obtained.Moreover,a two-loop PI controller was used to achieve preliminary control of the DC motor frequency conversion speed,so that the system could meet static and dynamic performance requirements simultaneously.Then,the voltage of the DC side was input into an SVPWM pulse width modulation system to further reduce motor harmonic loss and pulsating torque,thus a-chieving precise control for the frequency conversion speed.Simulation results show that the proposed method has bet-ter stability,accuracy,and overall performance in DC motor variable frequency speed regulation.
Single chipDC motorFrequency speed regulationPulse width modulationState space model
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