| Stepper motors have been widely used in various fields of industrial production as wellas daily lives due to their durability, no stepping accumulated erro, high efficiency and powerdensity, simple drive as well as high torque to inertia ratio and absence of rotor winding.Majority of them in the market are two-phase hybrid stepping motors (HSM), whichsynthesize the characteristics of PM and VR. Typically, phase currents in HSM are controlledindependently to each other with the circuit topology called double-H bridge. This topologyis known for high efficiency, good dynamic performance, especially run in high frequence.However, when running in low speed, it has poor stationarity, and also has high vibration andnoise, moreover, it need8power switching devices for ever drive system, it is designedspecially for two-phase AC motor, the hardware compatibility is weak. For all the problemmetion above, this study try to improve drive system for two-phase HSM through: first,perform all the control actions digitally to reduce cost; secondly, standardization of hardwareto reduce cost. Therefore, significant costs can be saved if standard voltage source invertercircuit can be used to drive two-phase HSMs, meanwhile, the hardware compatibility can beenhanced, it is importance for production standardization.The anthor applied the theory of vector control and the maximum torque/currentcontrol stratagem to two-phase HSM servo system, and designed SVPWM controll stratagefor the topology. A two-phase HSM servo system model based on standard voltage sourceinverter has been built in MATLAB/SIMULINK environment. Simulation results confirm thefeasibility and superiority of this scheme. In order to prove the scheme thought experiment, ahardware design based on high-performemt chip TMS320F2811has been developed for thetwo-phase HSM servo system, also the corresponding software design has been developedand the experimental results show the high performance of the system. |
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