The use of the interior permanent magnet synchronous motor (IPMSM) has increased in the industrial field because of
its excellent characteristics such as high efficiency, wide range of speed operation, and flexibility of the rotor structure.
Therefore, IPMSM, especially one using the rare earth permanent magnet, is being actively studied. In IPMSM using the
rare earth permanent magnet, typically the permanent magnet is deeply embedded in the rotor. The washing machine has
large load variation and needs high torque. So, IPMSM is better than any other motor types for washing machines. This
paper suggests a control algorithm of IPMSM for washing machines. Some experimental results are given in order to
show the feasibility of the proposed control schemes for washing machines.
UV lamp systems have been used for cleaning of display panels of TFT LCD or Plasma Display Panel (PDP). However,
the needs for high efficient cleaning and low cost made high voltage plasma cleaning techniques to be developed and to
be improved. Dielectric-barrier discharges (DBDs), also referred to as barrier discharges or silent discharges have for a
long time been exclusively related to ozone generation. In this paper, a 6kW high voltage plasma power supply system
was developed for LCD cleaning. The -phase input voltage is rectified and then inverter system is used to make a high
frequency pulse train, which is rectified after passing through a high-power transformer. Finally, bi-directional high
voltage pulse switching circuits are used to generate the high voltage plasma. Some experimental results showed the
usefulness of atmospheric plasma for LCD panel cleaning.
BLDC motors have many advantages over brushed DC motors and induction motors. So, BLDC motors extend their
application to many industrial fields. In this paper, the digital simulation and modeling of a 7-phase brushless DC motor
have been presented. The 14-switch inverter and a 7-phase brushless DC motor drive system are simulated using
hysteresis current controller and logic of switching pattern with the Boolean¡s function. Through some simulations, we
found that our modeling and analysis of a 7-phase BLDCM with PWM inverter would be helpful for the further studies
of the multi-phase BLDCM drive systems.
A closed-loop sensorless stroke control system for a linear compressor has been designed. the motor parameters are identified as a function of the piston position and the motor current. they are stored in rom table and used later for the accurate estimation of piston position. some experimental results are given in order to show the feasibility of the proposed control schemes for linear compressors.