February 2011

High reliability single-phase uninterruptible power supply

Generally, the largest cost reduction is achieved by reducing the number of switches employed in a converter power circuit. Diodes are less expensive than active switches and apart from this there is also a cost reduction from eliminating all the circuitry for driving active switches. Reducing the number of switches and passive elements in uninterruptible power supply topologies not only reduces the cost of the...

Author(s): Albu Răzvan-Daniel and PopenÅ£iu-Vlădicescu Florin

February 2011

Torque control in magnet flux estimation method of vector control with armature resistance estimation function of SPMSM using adaptive identification

In the conventional torque control (TC) of surface permanent magnet synchronous motor, the estimation of magnet flux becomes a big issue because the variation of permanent magnet flux that deteriorates the performance of torque controlled system. The injection molding machine contains a pressure control which is scarcely used on machine tools. The control of this pressure is very important for the operation of injection...

Author(s): Abdoulaye M’bemba Camara, Yosuke Sakai and Hidehiko Sugimoto