Field Oriented Control (FOC) is a standard for high performance control of permanent magnet synchronous motor (PMSM) in the industry. It has excellent transient and steady-state response and relative simple structure. This paper is concerned in study case of implementing FOC control in realtime embedded system. The experimental results show that the FOC performs well in controlling the torque and speed of the permanent magnet synchronous motor (PMSM) with satisfactory result.

Comparison of voltage vector control in various forms of tetrahedron that result from switching combination on three-phase four-leg system active filter is presented especially asymmetric tetrahedron shape which is a projection pqr-coordinate into αβ0-coordinate. Parameter tetrahedrons such as modulation boundary-line, reference vector, switching duration time and duty cycle are described. Duty cycle analysis conducted on the Shen’s model, the Zhang’s model, the Perales’s model and asymmetric’s model are presented. The characteristics results showed that switching combination of each IGBT conductor especially its reviews on the neutral wire. Asymmetric tetrahedron can be proposed as control technique in three-phase four-leg system active filter.

This paper discusses the Self Exitated induction Generator (SEIG) by approaching the induction machine, physically and mathematically which then transformed from three-phase frame abc to-axis frame, direct axis and quadratur-axis. Based on the reactive power demand of induction machine, capacitor mounted on the stator of the induction machine then do the physical and mathematical approach of the system to obtain a state space model. Underknown relationships, magnetization reactance and magnetizing current is not linear, so do mathematical approach to the magnetization reactance equation used in the calculation. Obtained state space model and the magnetic reactance equation is simulated by Runge kutta method of fourth order. The equation of reactance, is simulated by first using the polynomial equation and second using the exponent equation. The load voltage at d axis and q axis using the polynomial laggs 640µs to the exponent equation. The polynomial voltage magnetitude is less than 0.6068 volt from the exponent voltage magnitude

In this paper, we examine the basic method of reducing cogging torque by using the combination of slot and pole number with a simple software. The methods were applied to basic permanent machine designs and the performance was calculated using finite-element analysis (FEA). Prototypes of the machine designs were constructed and simulation results are obtained. To define pole and slot number combination a simple factor known as "goodness factor" is used. Every simulation result is obtained from MagNet Infolytica trial edition.

The existence of orchid species in Gunung Tampomas Natural Tourism Park is still not widely known. The existence of orchids many endangered by both natural decay and excessive exploitation of orchids. Communities in Gunung Tampomas Natural Tourism Park had very little information about the beauty and benefits in particular, because of the lack of information regarding the species of orchids in the Gunung Tampomas Natural Tourism Park. The object of research is inventaritation of orchid species to conservation of orchid species in Gunung Tampomas Natural Tourism Park. The method of the research used by Exploration with determination cruise lines based LMU (Land Mapping Units). The result of orchid species are 11 species of epiphytes which has been identified as many as 10 species; one species is identified only to genus and 2 species of terrestrial orchid.