# Sinusoidal Current

Also found in: Medical.

## sinusoidal current

[‚sī·nə′sȯid·əl ′kə·rənt]
(electricity)

## Sinusoidal Current

an alternating current that constitutes a sinusoidal function of time in the form i = Im sin (ωt + Φ), where i is the instantaneous value of the current, Im is the current’s amplitude, ω is the angular frequency, and Φ is the initial phase angle. Inasmuch as a sinusoidal function resembles its derivative, in all parts of a linear circuit carrying a sinusoidal current the voltages, currents, and induced emf’s are also sinusoidal. The use of sinusoidal currents in technology simplifies electrical devices and circuits, as well as design calculations. [23–1297–]

References in periodicals archive ?
If sinusoidal PWM method is used for control, the inverter will regulate these current pulses into a sinusoidal current in phase with the grid voltage .
They could be powered by a special power supply which was stimulated by a signal generator to produce a sinusoidal current excitation with adjustable amplitude and frequency.
It is made of a high internal impedance sinusoidal current source with a parallel coil to resonate the equivalent input capacitance of the active device.
The drive system developed can supply the sinusoidal current to the PMSM without the use of position or current sensors.
The ITG operates in current-control mode when connected in parallel with the utility power grid, tracking the grid frequency variations up to 5% of nominal and providing a sinusoidal current waveform with less than 5% harmonic distortion.
Optimized sinusoidal current control enables current startup sequencing and low loss space vector pulse-width modulation (PWM) for smoother startup and minimized torque ripple for maximum motor efficiency.
This current signal is the summation of a sinusoidal current part and a direct current part because the input current of the converter cannot be below zero.
Figure 14(a) shows waveforms of the input current the converter takes from the line, output current of the converter, and voltage of the dc-link circuit when EVA coil is driven by sinusoidal current half-waves at 33.
The active filter operation in the harmonic elimination mode allows an increasing in the power quality due to the achieved sinusoidal current flowing in the network.
A B6 bridge arrangement of power semiconductors (high-voltage MOSFETs or IGBTs) switches the DC current from the intermediate circuit into a sinusoidal current that is fed into the respective phase of the transmission and distribution grid.

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