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This paper proposes a standstill test method for the determination of electrical parameters of permanent magnet synchronous machine (PMSM) drive system fed by a conventional three-leg inverter. In order to estimate the equivalent total circuit resistance, a self-cancellation method is proposed to eliminate the influence of inverter nonlinearity on the calculation. With the identified equivalent total...
Magnetic materials made of iron-powder that are used for the cores of the chokes of voltage source inverters output filters significantly change their power losses and magnetic properties with the frequency and the amplitude of the choke current in the range that is important for designers. This causes the magnitude Bode plot of the VSI control transfer function to have a higher damping coefficient...
This paper presents the carrier signal injection based sensorless control of permanent magnet synchronous machine (PMSM) drives with limited inverter switching frequency. Accounting for the influence of stator resistances, the amplitude of carrier current utilised for position tracking can be maximized under an optimized injection frequency, with which signal to noise (S/N) ratio of carrier signal...
This paper reapproaches the possibility to use the current ripple introduced by power conditioning devices on fuel cells for a low-cost monitoring of the cell ohmic resistance, suitable for commercial applications. Being the ohmic resistance strongly dependent on the membrane water content, this technique can be usefully employed as a diagnostic tool for membrane humidity control. The proposed method...
Non-standard conditions in the power network such as voltage unbalance negatively affect operation of electric drives. The unbalance can be caused by a failure in the network or by an unbalanced load in the vicinity of the affected drive. Unsymmetrical voltages at the input of a voltage source inverter cause pulsations in the DC-link voltage when not properly taken care of. This may result in a significant...
Recently, 35 W class Fluorescent lamps with 32 mm tube diameter are replaced with 32 W one with 26 mm in diameter to conserve lamp materials and to increase luminance efficiency. Moreover, 35, 28 and 14 W fluorescent lamps with 16 mm (T5) in diameter, which are nowadays developed, also may replace 32 W lamps again. Application of slim lamps, however, requires small sized electronic ballast to full...
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