Research Of Switched Reluctance Motor Drive System

The structure of Switched Reluctance Drive (SRD) system and its development is introduced at home and abroad in this paper. The characteristics of Switched Reluctance Motor (SRM) and its principle are described in details. The variation of SRM winding current in different stages and the formula of toque are also analyzed in it. The control method, the design theories and ways of SRD, power converter and adjuster are studied in this paper. According to SRD's main technical requirements, the software and hardware of the 5.5kw controller is designed. PI adjuster, voltage chopping and current chopping of the SRD are realized by software and hardware , in order to realize current chopping in start stage and variable-angle voltage chopping in operation stage. Microprocessor AT89C52 is selected to be the main control unit. According to the running direction requirement and the signal of motor rotor position sensor, the microprocessor can produce on/off signals to control the IGBT by combining with protection signals. The control software is implemented by the modular program which can make the program more universal and readable. Results of the sample machine's experiments show that the controller can completely meet the technical requirements.The SRD designed in this paper has many advantages such as small torque pulsation, real-time regulation and so on. By using the PWM control and adopting the common voltage-regulation switch to control the supply voltage average value of phase winding, the controller has the DC motor speed regulation characteristic.