The effect of sinus rhythm on the periodicity and coupling interval of ventricular parasystolic rhythm.
Ventricular parasystole was studied in three patients. Long periods of the ECG were analysed allowing features of the ectopic mechanism to be deduced. The ECGs were recorded on magnetic tape and analysed with the aid of special purpose and digital computers. Sinus rhythm was found to alter the periodicity of the ectopic rhythm and to adjust its phase relation–ship relative to sinus rhythm. These effects were more marked when the ectopic period was similar to the sinus period or its multiple. In one patient phase adjustment resulted in periods of bigeminy with fixed coupling. The adjustment of periodicity and phase probably results from subthreshold stimuli due to sinus rhythm modifying the function of spontaneous depolarization of the ectopic pacemaker.
This paper investigates the nonlinear characteristic between voltage phase and torque and proposes a model-based design of voltage phase controller. PMSM drive systems should realize a quick torque response and have a wide operating range. However, in high-speed region, the control input is voltage phase only and the plant is nonlinear due to the inverter output voltage amplitude saturation. Because of this nonlinear characteristic between current and voltage phase, model-based design have not yet been carried out. As basic study, this paper proposes a model-based voltage phase controller for SPMSM. Simulation results and experimental results show the effectiveness of the model-based design method. In addition, the analysis of the derived plant model shows the relationship between q-axis current and voltage phase is a non-minimum phase system.