This paper proposes a computational method for predicting the dynamic response characteristics of a long strokelinear solenoid actuator with complicated shaped armature. In this method, the magnetic field is coupled with the electrical supply and the mechanical movement of the actuator, employing the axisymmetric finite element method (FEM). n t e influence of applied voltage on the response characteristics are investigated. As the result of that, computational error of 22.8% arises when applied voltage of 4.8V is fed, however, the error remains less than 2% when the applied voltage is higher; 5.8V and 6.8V. These results verify the utility of this method. In addition, the influence of the control method on transient response during positioning control is also examined, and the validity of PID (proportional, integral and differential) control is confirmed.
The rapid-start lamp has total of three discharge conditions until it comes to a continuous lighting condition, (1)(stathing mode, (2)weak discharge mode, 30steady-state discharge mode, and it is very difficult to design an optimum ballast for each discharge condition through a cut and try method. It is very important to obtain the accurate waveforms of input/output voltage and current in order to design and estimate the efficiency and the power factor of a lamp. Therefore, it is useful to estimate dynamic characteristics through an analytical approach. We have performed a dynamic performance analysis using a 2-D finite element method taking account of external circuit. But, it is difficult that the analyzed results of dynamic performances agree well with the measured results, because leakage magnetic flux, distributed three-dimensionally, cannot be considered by 2-D analysis.This paper describes a 3-D dynamic performance analysis of ballast for a rapid start lamp, and verifies its acceptability through a comparison with 2-D analysis results and experimental results.
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